SYSTEM AND METHOD FOR PROCESSING MIXED SOLID WASTE

专利摘要:
system and method for processing mixed solid waste. solid wastes that include a mixture of wet organic material and dry organic material can be separated using mechanical separation to produce a wet organic stream enriched in wet organics and a dry organic stream enriched in dry organics. the wet organic stream and the separated dry organic stream are converted separately into renewable or recyclable products using different conversion techniques particularly suited to the separate wet and dry organic streams.
公开号:BR112014004919B1
申请号:R112014004919-0
申请日:2011-12-30
公开日:2021-09-14
发明作者:George Gitschel
申请人:Organic Energy Corporation；
IPC主号:

专利说明:

SCOPE OF THE INVENTION
[001] The present invention relates to systems and methods for use in recycling and converting waste. More specifically, the present invention relates to the recycling and conversion of solid waste derivatives, for example, from commercial, industrial or domestic waste. RELATED TECHNOLOGY
[002] Commercial, industrial and domestic consumers generate large amounts of garbage and waste (ie municipal solid waste) that must be treated and disposed of in an environmentally satisfactory manner. Traditionally, municipal solid waste (hereinafter referred to as “MSW”) has been disposed of by landfilling or incineration. However, these waste disposal methods contaminate the soil, water and air. Environmental restrictions, in addition to land use requirements for housing, have reduced the number of sites available for landfill.
[003] In response, governments and the public have demanded that, wherever possible, recycling systems should be used to conserve material resources and reduce pollution problems. Efforts were made to recover valuable resources such as glass, plastic, paper, aluminum and ferrous and non-ferrous metals from waste. For example, households in many cities are asked to separate garbage into recyclables (eg paper, plastic packaging, metal packaging and glass (and non-recyclables.) However, the rates of non-compliance and wrong length are high. people do not select the garbage and others do it incorrectly, diverting recoverable materials to the garbage or contaminating the recyclable sequence with waste. Non-compliance and incorrect compliance reduce efficiency and increase costs associated with operational recycling systems developed for process pre-separated waste.
[004] Some recycling systems try to avoid problems with pre-separated waste by trying to recover recyclable materials from mixed waste. However, many of these systems are highly labor intensive to function, having relatively low recovery rates for recyclables.
[005] The energy balance of many recycling systems is mediocre or, in some cases, negative. Some recycling systems are so ineffective that the processes of recovering, transporting and recycling recyclable materials consume more energy than can be saved by simply depositing them in the landfill and manufacturing new products from the raw material. In other cases, very little of the recyclable materials is recovered, so that the problems with waste disposal are essentially absolute. BRIEF DESCRIPTION OF THE INVENTION
[006] The present disclosure relates to methods and systems for processing waste that include a mixture of wet organic material and dry organic material and optionally inorganic material. The systems and methods mechanically separate mixed solid waste to produce a wet organic stream enriched in wet organics and a dry organic stream enriched in dry organics. Each stream is processed separately to convert at least a portion of each stream into a renewable or recyclable product.
[007] Separated and recovered wet organic and dry organic products constitute a highly efficient raw material for energy conversion. Wet organic products can be digested in an anaerobic digester to produce biogas or compost for use in soil recovery. Biogas generated in the anaerobic digester can be compressed or liquefied for use as transport fuel and/or used to generate electricity and/or for on-site use and/or for distribution to the power grid and/or converted to liquefied fuel. Dry organic material can be recycled and/or used or sold as organic biomass fuel to produce heat and/or electricity. Inorganic material can be recycled and/or landfilled.
[008] The separation of dry organic material, wet organic material and optionally inorganic material improves the efficiency of downstream conversion techniques. For example, wet organics can be converted more efficiently into an anaerobic digester. Eliminating digestible dry organic and inorganic materials before loading them into a digester increases the volume available for microbial cultures and biogas production. Similarly, the elimination of wet organic and inorganic material from the dry organics increases the thermal conversion efficiency of the dry organic, as less energy is consumed in water evaporation and the burnt material produces less ash. In cases where recyclables are recovered from dry organics, the elimination of wet organic and inorganic materials reduces deep loads in the sorting process, allowing sorting equipment to work correctly and more efficiently and reduce wear and tear on machines. Additionally, the non-recyclable inorganic part can be more easily disposed of in landfills, as the volume of material to be deposited in the landfill will be smaller and more concentrated.
[009] The need to efficiently extract multiple types of recyclable materials from multiple mixed waste streams is a long-felt but unfulfilled need. The industry's inability to extract significant percentages of different types of recyclable materials from varied mixed waste streams has resulted in well-known political campaigns around the world to teach laypeople that it is their responsibility to place selected recyclables in the right place and time. point of generation and eliminate them later. Due to natural human behavior, these efforts, while commendable, have not resulted in the desired recycling rates and related diversions. The vast majority of recyclable waste continues to be poorly recovered and/or used. The methods and systems described herein fit this long felt and unfulfilled need by efficiently recovering recyclables using mechanical devices that are organized and configured to effectively handle a variety of solid wastes. Additionally, traditional residential selective recycling programs and commercial recycling programs require costly and polluting collection routes and vehicles. Furthermore, once collected by individual vehicles, the materials still have to be separated and the recyclables recovered in traditional Material Recovery Facilities (MRFs). This is quite ineffective and costly.
[010] The systems and methods described here can handle large volumes of highly varied mixed waste. The systems and methods can effectively extract recyclables from unsorted mixed waste (eg black MSW container), domestic recyclable waste where non-compliance is high (eg blue MSW container) and other types of MSW such as commercial solid waste variables of retail establishments, light productions, warehouses, office buildings, etc. and industrial waste. The methods and systems described here can recover significantly high percentages of different types of recyclable materials and organic materials for conversion into renewable fuels and energy from the various wastes as compared to known systems. This ability is largely due to mechanical separation to divide wet organic materials from dry organic materials and optionally inorganic materials using mechanical separators, such as crushers, size separators, density separators and/or dimensional separators, which create flows of concentrated and homogeneous intermediate waste from which energy and renewable recyclables can be mechanically extracted. Unlike traditional waste-derived fuel plants, the methods and systems of the invention fractionate and spread the waste sufficiently to prepare the intermediate streams for efficient conversion.
[011] These and other features of the versions disclosed herein will become more apparent from the following description and appended claims. BRIEF DESCRIPTION OF THE DRAWINGS
[012] To clarify a little more the above and other advantages and characteristics of the present invention, a more particular description of the invention will be presented in relation to specific versions, which are illustrated in the attached drawings. It is understood that these drawings illustrate only illustrated versions of the invention and should not, therefore, be considered as limiting its scope. The invention will be described and explained with additional specificity and detail through the use of the attached drawings, in which:
[013] Figure 1 is a scheme of a mechanized system for converting wet organic waste and mixed dry organic waste (optionally inorganic materials) into higher value products;
[014] Figure 2 is a scheme that illustrates the conversion options for processing dry organics;
[015] Figure 3 is a scheme that illustrates the conversion options for processing wet organics;
[016] Figure 4 is a scheme that illustrates the conversion options for processing inorganics;
[017] Figure 5 is a flowchart that illustrates the methods for extracting recyclable materials from mixed solid waste;
[018] Figure 6 illustrates a cross-sectional view of a pneumatic drum separator adapted for use in the system for separating solid waste by density according to an embodiment of the present invention; and
[019] Figure 7 is a flowchart illustrating a system for separating solid waste according to another version of the present invention. DETAILED DESCRIPTION I. Introduction
[020] Figure 1 is a schematic of an integrated waste processing and recycling system 100 that produces energy and/or renewable products from mixed solid waste. System 100 includes a mixed solid waste source 110. Mixed solid waste includes at least 10% wet organic waste and at least 10% dry organic material and optionally inorganic waste.
[021] Mixed residues 110 are mechanically separated to produce wet organics 114 and dry organics 116, and optionally inorganics 118. The residues are processed in a mechanical separation system 112 to produce individual fractions of separated residues suitable for conversion to energy and/ or renewable products. At least a part of the dry organics and wet organics are independently processed using conversion processes 131 and 139, respectively. The optionally inorganics 118 can be converted to a renewable or recyclable product using inorganic conversion techniques 135. Dry organic conversion 131 is particularly suitable for converting dry organic materials to higher value products and wet organic conversion 139 is particularly suitable for the conversion of wet organics into higher value products. By concentrating wet and dry organics into individual fractions, dedicated conversion processes can be much more effective compared to the same mixed solid waste conversion process.
[022] Separation system 112 may include components such as conveyors, grinders and/or crushers, sieves, classifiers, magnets, Eddy Current Separators, plastic classifiers and separators, which together separate the organic material moist from the dry organic material. A mechanical separator for separating wet organics from dry organics may include grinding equipment, sizing equipment and/or a density separator.
[023] Before loading the waste 110 into the separator system 112, the waste 110 can be manually separated to eliminate heavy metals, cement and stones that can damage the separator system 112, thick cardboard, electronic waste and/or obviously waste/chemical dangerous. Manual separation is typically minimal. For example, manual sorting can be performed by a floor separator loading operator while loading the waste into the sorting system 112 or by one or more line operators who obviously remove valuable items from the waste stream. In a preferred version less than 40%, 20%, 10% or even less than 1% (by weight) of the mixed waste is manually sorted to remove recyclable materials.
[024] The use of an automated system allows a better result and a greater recovery of fuels and/or recyclables. In one version, the mechanical separator results of the separation system are at least 2, 5, 10, 20, 50, or 100 metric tons per hour for a single mixed waste line and/or less than 200, 150, 100, or 50 tons metrics per hour for a single line of mixed residuals, or a range of higher and lower rates before the result. The term “single line” means a single input line that generates unique fractional flows of different materials.
[025] The separation system 112 produces a dry organic material 116 with a low moisture content. In one version, the separation produces a dry organic material with a moisture content of less than 30%, a moisture content of less than 25%, a moisture content of less than 20% or a moisture content of less than 15%. Remarkably, these moisture contents can be obtained from the separation system without drying or mixing with dry materials to dilute the moisture content.
[026] In relation to Fig. 2, the dry organics 116 are converted in a first conversion technique 131 into renewable material. Dry organic conversion can be useful for recovering recyclables (step 124) and/or for producing fuel 120. Recycling recovery 124 can include materials sufficiently separated to produce recycled commodities 107 that can be sold in a market and/or converted into products recycled 133. The production of fuel 120 may include conversion of dry organics to liquefied fuel 119, power generation 122, conversion to oil 121 or chemical conversion 109 or other form of energy.
[027] Even when the moisture content is moderately high, dry organic fuel can be advantageous due to an even distribution of water. In one version, the separation system 112 produces a dry organic material with less than 5% by mass of particles with a moisture content greater than 40% (preferably greater than 30% or even greater than 25%). In one version, the dry organic material has less than 3%, 2% or even 1% by mass of particles with a moisture content greater than 40%, 30% or 25%.
[028] While it is desirable to produce a dry organic fraction with the desired moisture content after separation, the present invention also includes systems in which the dry organic fuel can be dried. In a preferred version, drying is carried out using waste heat, such as waste heat from organic energy generation system 122 and/or biogas energy generation system 145 (Fig. 3). In a preferred version, drying is carried out using only residual heat (ie no fuel is burned for the primary purpose of drying).
[029] In one version, the invention concerns the maintenance of a desired content of moisture in the dry organic fraction over time. Maintaining the same moisture content over time can be important for the operation of a thermal conversion device using organic fuel. Separation system 112 can be used to minimize the variation in moisture content of dry organic material 116. In one version, a density classifier can be adjusted up or down in density separation to collect more or less amount of the organic fraction. so as to maintain a desired moisture content in the dry organic material. In one version, the dry organic material exiting the separation system 112 is measured over time and entered into a computer configured to control one or more components of the separation system 112 to obtain a target moisture content in the dry organic material 116.
[030] Referring to Figure 3, the wet organics 114 are converted to a renewable material using a second conversion technique 139. The second conversion technique may include anaerobic digestion, which is normally carried out by processing the wet organics 114 in a pre -process 134 and the digestion of wet material in an anaerobic digester 126. Alternatively, wet organics 114 can be processed in an anaerobic digester 130 or converted using compost 129. The products of anaerobic digester 126 can include biogas 132 or digesters 128. biogas 132 can be packaged or cleaned using packaging 141 and then converted into compressed natural gas 143. Alternatively, biogas 132 can be used in power generation 145, converted into pipeline or industrial gas 147, or converted into liquefied fuel ( eg through a Fischer Tropsch process).
[031] Digestion from an anaerobic digester 126 or an aerobic digester 130 may be further processed using solids/liquid separation to produce a soil recovery fertilizer and/or liquid 137. Digestion solids 128 may be further improved using compost 129.
[032] Inorganics 118 can also be processed to produce renewable products. The choice to process the inorganics 118 tends to depend largely on the type of material and the proximity of a market for the renewables in the location of the system 100. The inorganics can be converted to building materials 153, which can be used in cement or as soil repairman. Glass products can be melted and reprocessed to produce recycled glass products 155.
[033] Metals tend to have a high value but can be difficult to extract using traditional systems. In contrast, the highly efficient separation system of the invention can recover recycled metal products 157 from materials such as electronic waste and other heterogeneous materials that are difficult to separate. II. Separation of Wet Organic Waste from Dry Organic Waste
[034] Mechanical separation is used to separate the components of the mixed waste stream to produce a wet organic stream enriched in wet organics and a dry organic stream enriched in dry organics.
[035] Figure 5 illustrates a flowchart that shows an example of the process 140 for extracting recyclables and renewables from mixed waste. Steps 152 of separating wet organics from dry organics involve all or part of the following steps: (i) providing a solid waste stream 142, (ii) grinding the mixed solid waste, (iii) fractionating the stream of waste by size 146, fractionation of the waste stream by density 148 and mechanical separation 150. A. Supply of Solid Waste Stream
[036] The waste streams used, the methods and systems described here, include a mixture of different types of solid materials. The waste stream includes renewable and recyclable materials that after separating from other types of renewable and recyclable material or garbage can be used and, thus, be valued. In one version, mixed solid waste can be Municipal Solid Waste (“MSW” (ie, garbage). MSW consists of a type of waste that predominantly includes household waste with the addition, at times, of commercial and/or industrial waste collected by the Municipality or by a company contracted by a Municipality or by commercial and/or industrial companies in a certain area. Commercial solid waste is a type of waste, such as garbage, which is generally collected in companies, such as office buildings or commercial establishments Industrial solid waste is usually found in intensive production industries MSW and commercial waste does not generally include hazardous industrial waste Mixed waste can be “black container” waste, in which no or little waste has been carried out. elimination of renewable and recyclable materials by the origin of the waste or, alternatively, they could be recycled or "blue container" waste " which includes a mixture of renewable and recyclable waste (also referred to as "single-flow waste"). Single stream waste may be commercial or household and may have low or high non-compliance.
[037] Mixed waste includes several components that only have value as a renewable or recycled material when separated from the other components. These renewable and recyclable materials can include a range of plastics; fiber materials, including paper and cardboard; metals, including ferrous metals and non-ferrous metals such as bronze and aluminum; glass; textiles; rubber and wood. Preferably, the waste stream includes 1, 2, 3 or more high value materials including, but not limited to, plastic and non-ferrous materials.
[038] While even small amounts of these materials can be valuable, the separation of renewable and recyclable materials from each other and other components in mixed solid waste streams is extremely challenging. This is especially true when two, three, four or more different types of renewable and recyclable materials need to be separated and recovered.
[039] The methods and systems described here include providing the mixed solid waste stream that includes at least 10% wet organic material and at least 10% dry organic material that is mixed. The mixed waste stream may also include inorganic materials which may be renewable and recyclable or non-renewable and non-recyclable.
[040] The amount of renewable and recyclable materials in the stream, the percentage of renewable and recyclable material recovered, and the value of the renewable and recyclable material have a significant impact on the economic feasibility of extracting renewable and recyclable materials through mechanical separation (values larger are more desirable).
[041] In one version, the mixed waste stream includes at least 10% dry organic waste selected from the group of typically three-dimensional rigid plastic, film, paper, cardboard, textiles, rubber and wood. The mixed waste stream may include at least 15%, 20%, 25%, 30%, 40%, 50%, 70% or 90% by weight of a dry organic material and less than 90%, 80%, 60% , 50%, 40%, 30%, 25%, 20% or 15% by weight of a dry organic material or a range of any of the above or lower end points. In one version, the mixed waste stream may include at least 10% wet organic materials selected from the group of food waste (industrial, municipal or domestic), animal waste (eg manure such as human or manure waste. animals) or green waste (eg cutting industrial, municipal or domestic grass or cutting trees). The mixed waste stream may include at least 15%, 20%, 25%, 30%, 40%, 50%, 70% or 90% by weight of a dry organic material and less than 90%, 80%, 60% , 50%, 40%, 30% 25%, 20% or 15% by weight.
[042] The ratio of wet organics to dry organics will normally depend on the feed stream. In some cases, wet organics may be more concentrated than dry organics or vice versa. However, in many cases wet organic flow may be more prevalent due to food waste. In one version, the organic wet flow is superior by at least 5%, 10%, 15%, 20%, 30%, 50 or 70% and/or more than 40%, 50%, 60% or 80% by weight of the moist organics due to food residues.
[043] In some versions, a significant part of the waste stream may be a renewable or recyclable material. At least part of the waste stream may include a recyclable or renewable material. The mixed waste stream may include at least 2.5%, 5%, 7.5% or 10% of a recyclable plastic material or less than 60%, 40%, 20% (by weight) or a range of any of the higher percentages and lower back of recyclable plastic material.
[044] The mixed waste stream may include at least 5%, 10%, 15%, 20%, 25% or 30% of a recyclable or renewable mixed paper material or less than 80%, 70%, 60% 50 % or 40% (by weight) or a range of any of the above upper and lower percentages of the mixed paper material.
[045] The mixed waste stream may include at least 15%, 25%, 35% of a recyclable or renewable dry organic material or less than 80%, 70%, 60% 50% or 40% (by weight) or a range of any of the above upper and lower percentages of dry organic material. The mixed waste stream may include wet organic waste, dry organic waste and/or inorganic waste. In one version, the weight percentage of wet organic waste, dry organic waste and inorganic waste in the mixed waste stream is (independent of each other) at least 5%, at least 10%, at least 20%, at least 50% or at least 75% (the sum of the three weight percentages must not exceed 140%).
[046] In one version, the mixed waste stream may include at least 0.5%, 1%, 2%, 3%, 4%, 5% of a recyclable metal or less than 30%, 20%, 15%, 10% or 5% (by weight) or a range of any of the above and below percentages of the recyclable metallic material.
[047] In one version, mixed solid municipal waste may be unprocessed municipal waste. For example, the solid waste stream could be supplied directly from the municipal waste collection process. Alternatively, municipal solid waste may be partially pre-processed (eg by homeowners or businesses) to remove some of the recyclable and/or recoverable materials. For example, municipal solid waste may be derived from a comprehensive residential or commercial waste stream that contains the remaining materials that exclude source-separated materials collected through recycling programs in which a portion of certain materials is recyclable and/or renewable (eg .: mixed paper, newspapers, cardboard, plastics, ferrous and non-ferrous metals and/or glass) has been eliminated (ie MSW may be later recycled waste).
[048] In either case (ie, methods using unprocessed MSW or MSW separated at source), mixed waste may be manually pre-separated to recover and dispose of items that are difficult to crush or crush, obviously hazardous and/or that are particularly large (ie, easily separated) and can have a high recovery value. Pre-sorting can be carried out on the premises floor before loading waste into the system or it can be done by people on a dedicated pre-sorting line. For example, waste can be dosed to a pre-sort conveyor where manual labor identifies the items to be pre-sorted. Items that are typically pre-sorted will include items that could damage or cause excessive wear to the crusher or grinder. Examples include vehicle engine blocks, structural steel, tire rims, propane tanks, cement blocks, large stones and the like. Hazardous waste is preferably removed before crushing to avoid contamination of other materials in the mixed waste. Examples of hazardous waste include solvent and chemical deposits, paint cans, batteries and the like.
[049] Pre-sorting can also be used to recover particularly large and valuable items that are easily removed from the mixed waste stream. Typically, recyclable materials recovered in pre-separation will be items that are several times larger than the deep charges of the process stream so that they are easily visible and efficiently removed by hand. For example, large cardboard boxes (eg, corrugated bins), structural metal parts, and electronic waste (eg, electronic waste) can be recovered in pre-sorting. The percentage of materials in the mixed waste stream described above refers to the percentage of the waste stream just before going through shredding and/or sizing (ie, after pre-separation).
[050] As mentioned, the methods described here allow materials to be mechanically separated from municipal solid waste even when the waste includes large percentages of non-recyclable materials. In one version, the solid waste stream includes at least 20%, 25%, 35%, 50% or 75% of one or more low value materials. Low-value materials are materials that make separation from high-value materials difficult and which, in themselves, are generally not economical to separate. In one version, low value materials can be selected from the group consisting of wet organics, green waste, food waste, grain less than 1 inch, asphalt, cement, textiles, wood, rubber, film, PVC, blade, stone, used consumables, low value glass (glass far removed from a recycler) composite materials (eg sneakers) other materials typically found in solid waste and combinations of these. The methods described here go beyond the already felt but unfulfilled need to economically recover (i.e. mechanical separation) all or part of the recyclable and/or recoverable materials in these difficult-to-treat waste streams. Low value individual materials can be in a solid waste stream at a concentration of at least 5%, 10%, 15%, 20% or more.
[051] Experts will recognize that the composition of solid waste streams varies substantially over short periods of time. Of all the variability found in MSW, there are three constant characteristics in degrees of variation or percentages; density, dimension (2D or 3D) and moisture content. This invention, in part, uses a variety of equipment that sorts by size, density and dimension and then directs the material to equipment that sorts or recovers by type of material (eg resin type for plastic, ferrous metal, non-metals ferrous, glass, paper, etc.). In accordance with this invention, the percentage of a particular type of material within the waste stream can be calculated in accordance with acceptable industry standards such as the 2011 Waste Disposal Guidelines published by the California Department of Recycling and Recovery (Also known as “Calrecycle” and previously known as California Integrated Waste Management), which are hereby incorporated by reference (available at www.calrecycle.ca.gov/wastecharNourData.htm#Step 1 and associated links). A minimum waste stream sampling should include analysis samples of at least 200 lbs and sampling from a variety of different days, weeks and/or months. B. Fragmentation
[052] Separating wet organics from dry organics may optionally include grinding or cutting mixed waste. Fragmentation (eg, shredding or crushing) can improve the efficiency of other processes such as size separation and density separation.
[053] The shredded waste will have a range of particle sizes. In one model, the shredded waste stream has a top cut of 16 inches or less, 14 inches or less, 12 inches or less, 10 inches or less, or 8 inches or less, or a bottom cut of more than 1 inch 2 inches, 4 inches or 6 inches, or can have a top cut and bottom cut distribution of any of the previous top and bottom cuts for shredded waste. In a model, the ratio of the top cut to the bottom cut can be less than 8.6, or 4.
[054] The size distribution of any particular fractured material generally depends on its material properties. For example, some objects such as shipping pallets or tires will be crushed into relatively large particle sizes. In contrast, fragile materials like glass that tend to break, and food waste that tends to crush easily will be quite small after fragmentation.
[055] The crusher or cutter used to shred the mixed waste stream may include one or more wells that include a number of cutter heads that can cut and/or shred waste materials arriving in a selected size. Waste materials can be crushed or cut by rotating rotors mounted with cutting blades or knives against a rigid blade holder, which then drops through the cutter or crusher into the screen basket (perforated circular plate or reed screens). Materials with a crushed cut size less than a selected size fall through a screen and move to the next step in the process. Objects too large to pass through the screen are usually recirculated repeatedly through the cutter or shredder until they are of a size that will pass the screen.
[056] Some commercially available solid waste cutters or crushers are adapted or can be adapted to the fragmentation of the initial solid waste stream. For example, Vecoplan, LLC of High Point, NC brings together a number of solid waste crushers that can be incorporated into the system and used in the methods described herein.
[057] Preferably, the waste shredded by the shredder is cut or shredded to a size less than 18 inches, 16 inches, 12 inches, 10 inches or 8 inches and, better yet, 2 inches, 4 inches, 6 inches, 8 inches, 10 inches, or a range of any of the above top and bottom cut sizes. Fragmentation of the mixed MSWs before a size separation and density separation increases the separation efficiency of the density separators.
[058] In the present discovery, some fragmentation and/or fractionation steps are described regarding methods and systems for the separation of solid waste. Typically, each of these steps has an associated size cut. Persons with knowledge of the matter appreciate the fact that fractionated materials typically exhibit a distribution of particles. The distribution of any specific fraction often includes an insignificant number of particles above or below the cutoff. Unless otherwise specified, a higher number of cuts (eg, 16" or less, 12" or less, 8" or less, the upper range of an 8" to 2" overfraction generally means that about 90% of the particles in the specific fraction have a size less than the number of cuts, while about 10% of the particles in the specific fraction have a size greater than the greater cut size. Unless otherwise specified, a number of undercuts (eg, the lower range of a sub-fraction from 8" to 2") generally means that about 90% of the particles in the specific fraction are larger than the number of cuts, while about 10% of the particles in the specific fraction have a smaller size than the smaller cut size. On some models, cuts may be more efficient than 90% and 10%. For example, the number of top cuts for a specific fraction of 95% or 99 % of particles may be less than the number of cuts greater than s and/or less than 5%, or less than 1% of the particles in the fraction may be less than the undercut size. Specific cutoff numbers refer to the specific fraction and not the entire distribution. Depending on the waste stream, a significant percentage of the food waste stream may be less than the lower cut number and/or greater than the upper cut number, regardless of the efficiency of the sorting equipment. C. Size Separation
[059] The shredded waste can be transported to a sizing separator which fractionates the mixed waste by size to produce two or more sized waste streams (eg, at least one over-fraction and one sub-fraction).
[060] Sizing can be carried out to produce sized waste streams with a specific desired particle size distribution to facilitate density separation and to produce intermediate streams enriched in specific recyclable or renewable materials. Practitioners recognize that the fragmented waste stream can be analyzed to determine size cuts, in which the stream fractions separate different types of materials into different streams, while concentrating identical types of waste into somewhat concentrated streams. In addition, the sized waste streams can be optimized for density separation, creating a sized waste stream with a narrow particle distribution.
[061] In a model, the sized waste streams can have a size distribution with a ratio of small particles to large particles less than approximately 10 (i.e., the ratio of top cut to under cut has a ratio of less than approximately 10 ), preferably less than 8, 6, or 4 approximately. A size separation sub-fraction can have a top size cut less than 6 inches, 5 inches, 4 inches, 3 inches or two inches approximately and greater than 0.5 inches, 1 inch, 2 inches, or 3 inches or a band within any of the previous top and bottom values for the top size cutoff. The top fraction can have a top size cut smaller than 16 inches, 12 inches, 10 inches, 8 inches or six inches and a bottom size cut larger than 2 inches, 4 inches, 6 inches or 8 inches or one strip within any of the previous top and bottom cuts.
[062] Suitable examples of a size separator that can be used in the present method include a disc screen separator with rubber or metal discs, a finger screen separator, a drum screen separator, a screen separator vibrating screen, a cascading screen, an oscillating screen, flower disk screens and/or other known size separators.
[063] A disk screen employs a series of cylindrical rods with a series of disks attached with spaces between the disks through which objects can fall. Rolling the rods creates a wave-shaped action that stirs incoming material as it is transported forward. This agitation releases smaller materials through the screen holes and is performed without vibration or overlay. The disk screen design greatly reduces the possibility of compressing or scaling during operation. Drums, vibrating or finger screens, cascading screens, oscillating screens, flower disc screens and/or other known size separators also fulfill the same type of size separation objective, making use of slightly different mechanical designs. Various size separators useful in the invention are marketed by various manufacturers throughout the world. For example, disc screens, drum screens, vibrating screens, and waterfall screens are available from Vecoplan, LLC of High Point, NC. D. Density Separation
[064] One or more of the sized waste streams can be density separated to produce intermediate waste streams that are individually enriched in particular wet organic, dry organic and/or renewable materials. Although not required, density separation is preferably carried out in an apparatus downstream of the size separator. Downstream density separation allows the use of characteristic density separators in individual sized fractions, which allows the individual density separators to be configured for specific materials and flows. Density separator units can be calibrated to provide separation between specific materials in the mixed waste stream. Density separation can be used to separate different types of materials, such as wet organics, dry organics and inorganic materials, thereby enriching one or more specific intermediate flows in one or more different types of recyclable and/or renewable materials.
[065] In mixed municipal waste streams, inorganic waste, wet organic waste and dry organic waste often exhibit densities within specific ranges. For example, dry organics tend to have a density greater than 1.0 lbs/cubic foot and less than about 12 or 15 lbs/cubic foot; wet organics tend to have a density greater than 8, 10, or 12 lbs/cubic foot and less than about 60, 80, or 140 lbs/cubic foot; inorganic materials tend to have a density greater than about 80 or 140 lbs/cubic foot. Therefore, by setting the density separators correspondingly, wet organic, dry organic and inorganic fractions can be separated based on density. Similarly, specific types of recyclable and/or renewable materials, such as wood and textiles, are often found in a certain density range and can be selectively enriched in an intermediate waste stream. While the above densities are useful for many municipal waste streams, those skilled in the art recognize that the teachings provided herein can be used to analyze any mixed solid waste stream and determine density cutoffs that will create material enriched intermediate waste streams. recyclable and renewable.
[066] In some models, multiple density separators can be used to further fractionate the intermediate waste streams. In downstream density separators, the density cut-off is selected to fractionate the lower or higher fraction received from the upstream density separator.
[067] Additional size separation can also be carried out on density separated streams. Separation by size and density is carried out until the intermediate stream is sufficiently enriched and homogeneous in a specific recyclable or renewable material to allow efficient extraction of the recyclable or renewable material using mechanical sorting equipment.
[068] Referring now to Figure 6, an example of a density separation unit adapted for the separation of municipal solid waste by density is illustrated. Figure 6 illustrates an air drum separator 200. The air drum separator 200 includes an output conveyor 204, a fan 206, a rotating drum 210, an output conveyor 222, a heavy fraction conveyor 218, and a conveyor of light fraction 226. The mixed density residues 202 are introduced into the inlet conveyor 204. As the residues material 202 is introduced, it falls to the end of the conveyor 202, where the residues 202 meet a moving air stream. 208 of the fan 206.
[069] The heavy fraction 216 is separated from the mixed waste material 202 in that it is too heavy to be lifted by the air stream 208. The heavy fraction thus falls to the front of the drum 210 and falls to the heavy fraction conveyor 218 Conversely, lighter debris is lifted by air stream 208 and transported by rotating drum 210 and advanced through airflow 220 or conveyor 222. Light fraction 224 falls from the end of conveyor 222 to the light fraction conveyor 226. These machines are highly adjustable to change the weight density separation coefficient as desired.
[070] The relative density of heavy fraction 216 and light fractions 224 can be adjusted by controlling the air flow through the drum air separator 200. The speed of air flow and the volume of air passing through the drum separator 200 it can be controlled by increasing or decreasing the speed of the fan 206 or by opening or closing the valve 212. Generally speaking, opening the valve 212 and/or increasing the speed of the fan 206 allows you to carry heavier objects on the drum 210, so that the light fraction will have a higher average mass. Likewise, closing valve 212 or lowering the speed of fan 206 will cause heavy fraction 216 to have a lower average mass and light fraction 224 will have a lower average mass because only lighter objects will be transported over the drum. 210. Density separators suitable for use in the present invention include, but are not limited to, air separators available from Westeria F6rdertechnik GmbH, Ostbevern, Germany. Although the specific example illustrated in Figure 6 is favored on some models, other separators can be used, including density separators that do not include drums (eg gravity/air separators, wind transformers, wind screeners, jets of air, etc.).
[071] Density separators such as those illustrated in Figure 6 work best when the ratio between the larger and smaller objects introduced into the density separator is relatively narrow. Correspondingly, it is preferable that the ratio of larger to smaller objects introduced into density separators in the methods and systems described herein be approximately between 12 and 1 and between 10 and 1, between 8 and 1, 6 and 1, or between 4 and 1 Preferably, the ratio of largest to smallest objects introduced into density separators in the methods and systems described herein is approximately between 6 and 1 (i.e., where the ratio of top cut to bottom cut is in the above ratios ). In one embodiment, the methods and systems of the present invention are designed to provide waste materials to density separators with particle size ratios within these approximate ranges. E. Metrics to Control Flow Rates and Load Depth
[072] Optionally, the methods may also include the metric of sized waste streams and intermediate waste streams through the system to achieve a desired mass flow and load depth. In one model, the comminuting apparatus, size separator, density separator and/or mechanical classifiers are separated by one or more conveyors that have variable speed controls. Variable speed control can be set to optimize the mass flow through the comminution apparatus, size separators, density separators and/or mechanical classifiers to optimize the quantity, purity and/or value of recyclable or renewable materials that are recovered system, ensuring a metric and evenly distributed presentation of the material on the individual devices. One or more sensors positioned upstream, downstream or within one or more system components can be used to monitor the efficiency, effectiveness and purity of separation and/or the recovery rate of recyclable or renewable materials. These values can be used to optimize or maximize one or more system parameters, such as the amount of recovery, the purity and/or the value of recyclable or renewable materials recovered. Examples of sensors, which can be used to control the rate of the waste stream, include level sensors such as but not limited to optical sensors and/or ultrasonic sensors that measure the height of material, based on a conveyor and/or upstream metric device and/or measuring open space on a belt. A belt, metric device, or other piece of equipment can be accelerated or decelerated, using sensor data to ensure that a desired flow rate or load depth is achieved on a belt or in or through a piece of processing equipment ( eg size separators) and/or any other part of the system described herein. Other sensors include mechanical switches that are physically actuated by the waste stream, based on a desired level (eg, height), which actuates the mechanical switch to provide a signal that can be used to regulate the flow or depth of the load. . The speed of all metric equipment including; mobile floor; transporters; metric drums; crushers or grinders; air drum separators; screens of all kinds; vibrating feeders; metric feed tanks; load levelers; and other such devices can be controlled and adjusted through control systems and other devices to properly measure material throughout all parts of the invention. In some models, the metric can be critical to achieving the desired high recovery and purity of recyclable or renewable materials from mixed solid waste.
[073] Systems and methods may include the use of multiple sensors and metrics of the flow or loading depth of the transported waste material to multiple classifier devices. Although not required, it is preferable that each classifier device have an associated sensor and that the sensor be used to autonomously track the metrics of two or more classifier devices. For example, a level sensor or flow sensor can be positioned near an inlet to any combination of three-dimensional classifiers, optical classifiers, eddy current separators, or the like. III. Conversion of Renewable Materials
[074] The separated dry organic stream and the separated wet organic stream are separately converted into a renewable product, using first and second conversion techniques, respectively. Any number of conversion techniques can be used to process any number of separate enriched intermediate waste streams produced in separation system 112 (Fig. 1). The first and second conversion techniques are different techniques, which allows the techniques to be selected to be more suitable for the conversion of dry organics, respectively, when compared to a single conversion technique. For example, dry organics can be converted to waste-derived fuel with less energy consumption than materials that include wet organics and must be dry, and wet organics can be converted more efficiently to biogas in a digester anaerobic without dry organics and inorganics. A. Dry Organic Material Conversion
[075] Any number of dry organic conversion techniques can be used to convert the dry organic fraction into a renewable product, such as waste-derived fuel (RDF) or recyclable material. Examples of suitable conversion techniques include plasma arc thermal conversion, gasification, pyrolysis, biomass thermal conversion, plastic to oil conversion, biogas to liquid fuels (eg, Fischer Tropsch), waste fuels, chemical conversion processes (eg PETE plastics to terephthalate)
[076] In one model, dry organic material can be converted into a waste-derived fuel by processing dry organic waste to have a certain desired moisture content and BTU value. In one model, the dry organic material can have a BTU value in the approximate range of 4000-15,000, more specifically of approximately 5000-10,000, and even more specifically of approximately 6000-8000 and a moisture content as mentioned above.
[077] Waste-derived fuel (RDF) can be compacted to allow it to be dispatched and/or properly burned in a biomass boiler. Typically, compacted dry organic material 116 may have a density in the range of approximately 0.5 lb/ft3 - 50 lb/ft3, more specifically approximately 1 lb/ft3 - 30lb/ft3, and even more specifically ca. 2 lb/ ft3 - 20 lb/ ft3, or even more specifically ca. from 3 lb/ft3 - 10 lb/ft3.
[078] RDF fuel can be compacted to form flakes or pellets and can be used, in any case, in an installation where RDF fuel is used, without being limited to that, as a cement station where the dry organic material can be used to heat an oven to produce cement.
[079] In a privileged model, the dry organic material is not pelletized and is used in an installation in one or more conversion technologies, such as thermal conversion or electricity production. Where power is needed, electricity can be used locally or connected to a local power grid. Since energy is generated locally, electrical energy is more valuable as very little energy is lost in transmission.
[080] In one model, the dry organic material 116 can be used as fuel in a biomass boiler to generate steam and drive a steam turbine to produce electricity. An example of a biomass boiler is described in U.S. patent application publication 2009/0183693 to Furman, which is incorporated herein by reference.
[081] In one model, the biomass boiler can be configured to burn using a fluidized feed. The dry organic material can be relatively light and easily fluidized to burn well within a fluidizing biomass boiler. The use of this type of biomass boiler combined with on-site energy production saves compaction and/or pelletizing costs, produces boiler efficiency, allows local use of electricity and waste heat, thus maximizing the caloric value of the organic material dry and minimizing carbon emissions.
[082] The dry organic material can be used in a gasification process. Gasification can be achieved by reacting dry organic waste at high temperatures (>700°C), without combustion, with a controlled amount of oxygen and/or steam to produce synthesis gas. Synthesis gas can also be used to produce fuels. Several different gasification processes are available for use with dry organic waste. Examples of suitable gasifiers include fixed bed and parallel current gasifiers, fluidized bed reactors, occluded flow gasifiers and plasma gasifiers.
[083] In one model, the dry organic material can be converted into a high-value chemical compound (ie, one other than a hydrocarbon fuel). For example, plastics and rubber can be converted to polystyrenes through catalytic cracking with two-step distillation; the polyolefin material can be formed through catalytic cracking and the polyethylene terephthalate can be created from PETE by dissolution. Conversion techniques to produce these high-value chemical compounds are provided by Gossler Envitec GmBH (Germany).
[084] In yet another model, the separated plastics, such as plastics with foil, can be converted into liquid fuels through known techniques of converting the plastic into fuels (usually catalytic processes and/or pyrolytic processes). The components of the dry organic stream can also be converted to biogas through digestion. For example, paper products can be pulped and then digested by anaerobic digestion to produce biogas, which can be combusted or converted to a liquid fuel using a suitable process such as Fischer Tropsch.
[085] Wet organics can be converted, in part, using a mechanical biological treatment, in which wet and dry organics are encapsulated and can release water to reduce the water content. The dried organic waste can then be further processed using one or more other conversion techniques.
[086] The methods described here also include extracting various recyclable or renewable materials from the intermediate waste stream, using one or more mechanical classifier devices. The specific mechanical classifier apparatus used depends on the specific recyclable or renewable material to be extracted.
[087] Again with reference to Figure 2, method 140 includes (i) in a first step 142, providing a mixed waste stream including recyclable materials such as paper, plastic and metal (particularly non-ferrous metal); (ii) in a second step 144, fragmenting the mixed waste stream; (iii) in a third step 146 fractionating the mixed waste stream by size to produce multiple sized waste streams; (iv) in a fourth step 148, fractionating at least a portion of the density sized waste streams to produce several intermediate waste streams individually enriched in one or more recyclable materials; (v) in a fifth step 150, individually classify the intermediate waste streams, using one or more classifier apparatus to produce recyclable products such as, but not limited to, recycled paper products, recycled plastic products and/or recycled metal products . Optionally, the method can include measuring and/or expanding waste streams sized by any or all parts of process 140 to control the mass flow and/or depth of charge. In one model, the classifier apparatus can be a dimensional classifier, such as a two-dimensional or three-dimensional classifier apparatus. Examples of 2D-3D classifiers include ballistic separators and/or screens configured to separate two-dimensional items from three-dimensional items. Two or more ballistic separators and/or screens can be used in series or in parallel. Dimensional separators can be used to recover one or more materials that are mixed with another material that has a similar density but substantially different dimensional properties (other than size). For example, in a model, the 2D-3D separator can be used to separate rigid plastics (which tend to be three-dimensional) from plastic film and/or paper, which are generally two-dimensional and flexible. Two-dimensional plastics include films and rigid materials that are generally less than 1/8 inch thick. Therefore, two-dimensional materials are considered two-dimensional because their thickness is much less than their length and width (eg, 10 times or 140 times less). Additionally or alternatively, the 2D-3D separator can be used to separate wood (which tends to be more three-dimensional) from textiles (which tend to be more two-dimensional). Ballistic separators can also separate materials into rigid and flexible categories.
[088] Another mechanical classifier device that can be used is an optical classifier. The optical classifier can be configured to separate film plastics from paper or to separate different types of plastic from each other. For example, an optical classifier can be configured to recover HDPE and/or PETE from an intermediate waste stream. One or more classifiers can also be configured to reclaim #1-7 plastics and/or to remove and/or reclaim PVC plastics. Optical classifiers can also be used to classify an enriched intermediate stream into small inorganic particles. There are many types of optical classification technologies, including, but not limited to; Near Infrared (NIR), color sorter camera, X-ray, etc.
[089] Optical classifiers can digitize the intermediate waste stream and determine if the material that is analyzed is a specific type of plastic, paper or glass. The optical classifier, in terms of detecting a particular material, uses air directed by nozzles to eject the intended/identified material to produce one or more recycled products, such as recyclable PETE, recyclable HDPE, recyclable film plastic, plastic #3-7 recyclable and/or recyclable paper products.
[090] Any known optical classifier can be used. For example, in one model the optical classifier can operate by digitizing the intermediate waste stream in a free fall using a camera sensor. The chamber sensor detects the material and then the air jets can quickly eject the material while it is in free fall. There are also optical classifiers that use near infrared, X-ray and other scanning technologies to separate intended materials from mixed streams. Any number of optical classifiers can be used in series or parallel. Optical classifier manufacturers include TiTech Pellenc, MSS, NRT and others. B. Conversion of Wet Organic Material
[091] The wet organic fraction can be processed in one or more conversion techniques that are very suitable for materials with a high water content (eg greater than 25% 30% water). Suitable conversion techniques for wet organic flow include wet or dry digestion, including anaerobic digestion, aerobic digestion, and composting.
[092] Referring again to Figure 1, separation system 112 produces a wet organic material 114 that is digested in anaerobic digestion 126. Separation system 112 can use any anaerobic digestion, including thorough mixing, continuous flow, and/or digestion upflow anaerobics. In a preferred embodiment, the anaerobic digestion system 126 includes an upward flow anaerobic digester and, preferably, the upward flow anaerobic digester system is an induction blanket upward flow anaerobic digester. Induced upward flow anaerobic digesters include a horizontal divider that increases solids and bacteria retention and reduces the hydraulic retention time required to digest organic solids.
[093] In a model, the hydraulic retention time of the anaerobic digester is less than 20 days, preferably less than 15 days, and even better if it is less than 10 days. Preferably, the anaerobic digestion system 126 includes a number of individual tanks that allow for maintenance without interrupting general service. Preferably, the anaerobic digester includes methanogenic and acidogenic bacteria in one tank.
[094] A description of suitable microbial digestion systems that can be used to digest the wet organic waste product produced in the current method can be found in U.S. Patent No. 7,615,155 entitled "Methods for removal of non-digestible matter from an upflow anaerobic digester," 7,452,467 titled "Induced sludge bed anaerobic reactor," 7,290,669 titled "Up flow bioreactor having a septum and an auger and drive assembly," and 6,911,149 titled "Induced sludge bed anaerobic reactor ," and U.S. Patent Publication No. 2008/0169231 entitled "Up flow bioreactor with septum and pressure release mechanism," which are incorporated herein by reference.
[095] To provide a perfect digestion in the system of the digester 126, a feed system of the pre-processing digester 134 can be used as discussed above in relation to Figure 3. The feed of the digester 1134 may include a grinding apparatus or crusher to reduce the particle size of the wet organic material. In one model, the particle size is reduced to less than approximately 1 inch, preferably to less than 3/4 inch, and even better to less than 1/2 inch. Feeding the digester 134 may also include increasing the temperature of the wet organic material to obtain a desired temperature at or 2-10°C above the operating temperature of the digester. Additionally, water can be added to the organic material to obtain a desired solids concentration. In a model, the temperature can be mesophilic or thermophilic. In a model, the temperature is in a range between 110° F and approx 180° F, more specifically between 120° F and 150° F approx. These temperatures can be achieved using waste heat from on-site power production and/or from furnace operation using on-site organic fuel and/or biogas. Heating can be to a feed system component 134 or directly to the anaerobic digester.
[096] In one model, the water added to the wet organic material is obtained from an effluent from the anaerobic digester system 126. The feed to the digester 134 can produce a mixture of wet organic material with a solids content between 5% and 40 % approx, more specifically between 10% and 35% approx., and even more specifically between 15% and 30% approx. As mentioned above with reference to Figure 3, the anaerobic digestion system 126 or the aerobic digestion system 130 can produce a compost-like product (i.e., digestion 128). Digestion 128 can be dehydrated or dried directly or further cured by aerobic compost 129 and/or otherwise processed to a highly nutritious soil correction 137. In a preferred model, digestion 128 has a reduced pathogen and/or reduced content. germs and should be as free as possible of inorganic material such as glass and plastic. High quality digestion can be produced, using thermophilic temperatures in anaerobic digestion system 126, coupled with extensive separation processes 112 and pre-process digester feed 134 to remove unwanted inorganic materials. Digest 128 can be dehydrated using mechanical methods 131 and dried using waste heat from the biogas energy production system 145 and/or dry organic energy production system 122. In this model, the combustion exhaust can heat up directly digestion, or exhaust can indirectly heat the digestion through the use of a heat exchanger. Alternative drying methods include aerobic 129 composting, solar drying or outdoor drying.
[097] As mentioned, the anaerobic digestion system 126 produces biogas 132, which can be conditioned using a biogas conditioner to remove impurities and/or to increase the concentration of hydrocarbons. The conditioning of biogas 141 can include the removal of hydrogen sulphide, carbon dioxide, water and/or other constituents commonly found in biogas. Gas conditioning can be accomplished by adsorbing unwanted constituents onto an adsorbent such as zeolite.
[098] The packaged biogas 132 can be processed into a liquid or compressed fuel 131. Typically, the biogas 132 is compressed in a series of compressors to obtain a desired pressure for use in the transport fuel. Compressed and packaged biogas 132 can be used on site for energy production equipment that traditionally runs on diesel fuel. Alternatively, the packaged and compressed car 132 can be sold or transported for use in conventional compressed natural gas applications. In yet another model, the conditioned biogas 132 can be liquefied using compressors and/or refrigeration. Liquefied biogas can be sold or transported to use conventional liquefied natural gas applications. Conditioned biogas 132 can also be converted to bio-diesel using a Fischer Tropsch process.
[099] The conditioned biogas 132 can also be flared to produce heat and/or electrical energy in the biogas energy production system 145. The biogas energy production system 145 can use known energy production systems to burn methane to produce electrical energy. Power generation system 145 may use a micro-turbine or a conventional internal combustion engine coupled to an electrical generator and/or a thermal oxidizer coupled to a steam generator. Biogas conditioning 132 can improve the combustion properties of biogas 132 and power generation system 145. However, where power generation system 145 is intended to burn little BTU biogas and/or biogas including gases such as hydrogen sulphide , biogas 132 can be used in the 145 energy production system without gas conditioning. Examples of other techniques for converting wet organic waste include composting, where wet organic material can degrade in the presence of oxygen to produce a compost with aerobic conditions. This technique is energy intensive and not privileged where biogas is to be obtained.
[0100] Wet organics can also be processed in dry digestion, in which wet organics can be placed alone in a digester or together with other dry organics or inorganic materials, through which moisture under low oxygen conditions infiltrates through the material, to create anaerobic conditions. Dry digestion produces biogas that can be collected and flared for energy or converted into a liquid fuel. C. Inorganic Material Recovery
[0101] In one model, the intermediate organic waste stream can be enriched in metal, including a ferrous metal and/or a non-ferrous metal. To extract a non-ferrous metal an eddy current separator can be used. Eddy current separator can recover non-ferrous metals such as aluminum, brass and copper. Alternatively or additionally, metals can include ferrous metal and one or more magnetic separation devices can be positioned throughout the system and configured to collect ferrous metal. Examples of magnetic separators include drum magnets, cross-belt magnets, piston head magnets, and the like. Optical classifiers, stainless steel classifiers, infrared classifiers, camera classifiers, induction classifiers, metal detection systems, X-ray classifiers and the like can be used to separate different types of metals from each other to produce a recyclable product. Recyclable metal products produced in the methods and systems described herein may be selected from the group including non-ferrous recyclable products such as aluminum, brass and copper and/or other metals such as iron and/or stainless steel.
[0102] The classification and mechanical fractionation of the systems and methods described here are particularly useful for extracting high-value materials such as non-ferrous metals as well as paper and plastic. In prior art systems, these items have been particularly difficult (or practically impossible) to extract and/or sort from mixed solid waste. Conventional systems often cannot extract a significant part of paper, plastic and/or non-ferrous metals because these materials cannot be extracted using a magnet. The method of using magnets in traditional mixed waste processing systems is well known. Magnets are inexpensive enough and can be used in multiple locations with one system to make their use economically viable even when the magnet only extracts a small percentage of ferrous material. However, it is very difficult to recover graded ferrous metal from mixed solid waste and is ineffective due to the multitude and variety of materials found in mixed solid waste. The typical condition of mixed solid waste, as it is purged from the collection of transfer carts and/or trailers, is such that a simple magnetic device would likely have a very low percentage, less than 20%, of the available ferrous metal contained in the stream. of mixed solid waste, and any metal recovered in this way would most likely be contaminated by other materials found in mixed solid waste that could become trapped between the surface of the magnet and the attached ferrous metal object (eg paper, plastic, etc. .). Conversely, materials such as recyclable plastics, paper and non-ferrous metals (eg brass) are often not extracted from mixed waste because the sorting equipment for these particular materials cannot handle the waste streams as configured in these systems. Despite the fact that non-ferrous metals and many classified recyclable plastics are typically 5-15 times that of ferrous metals, the industry typically uses mechanical means to extract ferrous metal from mixed solid waste. Furthermore, the recovery of these high-value recyclables such as paper, plastics and non-ferrous metals is hampered by the same usual mixed solid waste conditions, as these recyclables are so mixed and hidden within the wide variety of other non-recyclable items found. in the mixed waste stream (eg organics, inert materials, wood, textiles, filaments, etc.). Additionally, a large part of mixed solid waste, especially from residential collection paths and multi-family dwellings, is deposited in plastic bags and disposed of. Hand-opening garbage bags picked up from mixed solid waste and the subsequent classification and recovery of any released recyclables would be cost prohibitive in most developing countries. Finally, the highest value recyclable products/materials (eg PETE plastic, HDPE plastic, #3-7 plastic, aluminum cans, stainless steel, copper, brass, mixed non-ferrous metals) are usually found in percentages very small between 1% and 4%, on an individual material basis, relative to the overall mixed solid waste stream. Without most or all of the components described here (eg, preparation, sizing, metrics, homogenization and classification), it is nearly impossible to extract these high-value recyclables from materials with such a low percentage available within the flow. mixed residues, in an economically viable method. The methods described here offer innovative, efficient and high-yield solutions to this long-standing challenge in the waste processing industry. D. Recyclable and Renewable Materials Recovery Fees
[0103] The present invention is particularly advantageous for recovering the majority of one or several different types of recyclable and renewable materials present in the mixed solid waste stream. The methods and systems are particularly useful when high value recyclables are present in very low concentrations. The systems and methods allow processing the mixed waste stream to, metaphorically speaking, "find the needle in the middle of a haystack."
[0104] In a model, the mixed waste stream may include at least one type of recoverable material at a concentration of less than 15%, less than 10%, less than 5% or even less than 1%, in which the system or method is configured to recover at least 50%, at least 70%, at least 80% or even at least 90% of the particular recoverable material.
[0105] Additionally, the methods and systems as described herein can recover at least 25%, 50%, 75% or 90% of the recyclable metal in the waste stream (by weight) as a recyclable metal product with a purity suitable for sale to a trader in recyclable metals.
[0106] The process can recover at least 25%, 50%, 75% or 90% of the recyclable plastic materials in the mixed waste stream (by weight) to monetize a recyclable plastic product with a purity suitable for sale to a product merchant recyclable plastics.
[0107] The process can recover at least 25%, 50%, 75% or 90% of the recyclable mixed paper products in the mixed waste stream (by weight) to monetize a recyclable mixed paper product with a purity suitable for sale to a recyclable mixed paper merchant.
[0108] The process can recover at least 25%,50%, 75% or 90% of the recyclable dry organic materials to produce one or more (eg 1, 2, 3, 4 or more) recyclable dry organic products or renewable. Dry organic products can be selected from the group of mixed paper, 3-D plastics, film plastics, textiles and wood.
[0109] Fragmentation, sizing and/or density separation can be used to produce homogeneous recycling streams that are sufficiently free from contamination by recycling or used without further separation from other types of components present in mixed waste and/ or that can be marketed as a recyclable product.
[0110] The various renewable materials and products can be used on-site or off-site from the separation system to produce renewable products such as plastic bottles, metal parts, energy and/or heat to carry out any process of manufacture known in the art to utilize renewable energy and products. IV. Systems for Separating Mixed Solid Waste
[0111] Figure 7 illustrates a system 300 that can be used to separate wet and dry organic materials and recover renewable and recyclable products from a mixed waste stream. In Figure 7, a mixed solid waste, such as municipal solid waste, is metered into a pre-sorter conveyor 302. Metric can be carried out using a metric drum 304 and a feed conveyor 306 that receives the mixed solid waste from a mobile floor deposit feeder 308. Solid waste mixed in conveyor 302 is transferred to crusher or grinder 316. Mixed waste in conveyor 302 can be sorted manually. For example, workers can pick up large pieces of cardboard that are easily identifiable and sorted from large volumes of waste. Other materials can also be manually picked up prior to shredding, cutting or downsizing, including large pieces of treated wood, electronic waste, or other obviously valuable items that can be effectively picked up by hand or otherwise conveniently pulled away by the conveyor 302. The Waste Household Toxics (HHW) can also be removed from conveyor 302 and properly packaged and removed to proper facility. The collected cardboard can be collected and stored in warehouse 310 or packaged and sent to a paper disposal machine. Other recyclable materials, such as non-ferrous and ferrous metals and/or other sources of recyclable materials, can be collected and stored in warehouse 312 or additional warehouses. Additionally, toxic waste can be collected and stored in storage 314 and subsequently disposed of in an appropriate manner. Although pre-sorting is not required, pre-sorting can be particularly useful to avoid toxic waste contamination and potential crusher damage due to heavy ferrous structural metal, cement blocks, large stones and other items.
[0112] Material from conveyor 302, which is not picked up, is delivered to crusher or grinder 316, which grinds or cuts the waste to a desired top cut as described above. The crushed material is moved on a conveyor 318 under a suspended magnet 320, which collects exposed ferrous metal in the waste stream and delivers it to ferrous metal storage 322.
[0113] Due to the depth of the charge, the magnet 320 is preferably a suspended drum magnet, although other magnets alone or in combination with a suspended drum magnet can be used. Drum magnets are advantageous due to the depth of charge prior to sizing and their ability to capture ferrous metal in flight after being eliminated from conveyor 318, thus minimizing most of the non-metallic cross-contamination of the extracted ferrous metal. Other types of magnets (eg cross-belt magnets) can also be mounted in a way suspended above the head shaft of the conveyor belt.
[0114] The shredded waste passing under the magnet 320 is fed to the screens 324, which separates the shredded waste stream by size to produce a first overfraction and a first overfraction. Screens 324 may include a screen or screens of similar and/or different size and screen types for producing one or more subfractions and one or more superfractions. The over-fraction can be enriched in dry organics and the sub-fraction can be enriched in wet organics.
[0115] The subfraction (i.e., fines) of the webs 324 is conveyed on conveyor 326 to a second web 328. The subfraction (i.e., fines) of the second web 328 may include wet organics and/or heavy organic materials, which may be processed using a 330 Eddy Current Separator to recover non-ferrous metals. Conveyor 329 can be switched to direct filaments from fabric 328 to conveyor 336 if inorganic fraction is dominant or to eddy current separator 330 if wet organic is dominant. Wet organics from eddy current separator 330 can be collected and stored in bin 332 and non-ferrous metals collected in bin 333.
[0116] The overfraction (ie coarse) of the fine screen 328 can be further processed in density separator 334 to produce a light fraction with a small particle size and a heavy inorganic fraction. The heavy inorganic fraction may be transported to conveyor 336 and the light fraction may optionally be loaded into a second density separator 338 for further separation into a light dry organic fraction and a heavy wet organic fraction.
[0117] Referring now to the first overfraction (from screen 324), the overfraction is transported on conveyor 340 to third density separator 342. The third density separator 342 can be configured to produce a light intermediate flow and a heavy intermediate flow . For example, the third density separator 342 can be configured to cut between 8 and 15 lbs. Light midstream (ie less than 8-15 lbs) can be enriched in dry plastics, paper, light ferrous metals (eg cans and can lids and other light ferrous metal items) and light non-ferrous metals (eg, aluminum cans and other lightweight non-ferrous items), which are transferred to conveyor 344.
[0118] The heavy intermediate waste stream from the third density separator 342 (ie greater than 8-15 lbs) can be enriched in heavy inorganic materials and heavy wet organic materials and heavy dry organic materials (eg wood and textiles), which are delivered to the fourth density separator 346 for further separation. The 346 fourth density separator can cut between 60 and 120 lbs to produce a lightweight intermediate stream that is delivered to the 364 fifth density separator. The 364 fifth density separator can cut 40-60 lbs of wet organic materials and 10-15 lbs. of dry organic materials consisting primarily of wood and textiles. The fourth density separator 346 can also produce a heavy interflow (i.e., greater than 60-120 lbs) enriched in heavy inorganic residues that are delivered to conveyor 336. Interflow in conveyor 336 can be classified using a drum magnet pendant to collect ferrous metal and debris from the flow loaded onto vibrating feeder 350 which feeds an eddy current separator 352, which separates non-ferrous metal from inorganic residue residues. Non-ferrous metals can continue to be separated by infrared or another 381 classifier to extract copper and/or brass from other non-ferrous metals (i.e., to produce a mixed non-ferrous product stored in storage 396 and a tin and/or product copper stored in storage 398). Non-ferrous metals can be packaged and/or grouped for shipment to mills.
[0119] The remainder of the waste stream exiting Eddy Current Separator 352 is loaded onto conveyor 354 and continues to be processed using a 356 stainless steel classifier and 358 optical glass classifier. The intermediate stream can be classified to extract steel stainless using the 356 stainless steel classifier and/or classified to extract glass using the 358 optical classifier. The classification can produce recyclable stainless steel products and recyclable glass products, which can be stored in bins 362 and 360, respectively.
[0120] Referring again to the fifth density separator 364, the light intermediate stream of the separator 346 can be fractionated to a density up to 15 lbs, and for wood and textiles up to 40lbs - 60lbs, for heavy wet organics to produce a waste stream light intermediates enriched in wood and textiles. Wood and textiles can be separated in 2D-3D classifier, such as ballistic or angled disc screen separator or other type of 2D-3D separator 366 to monetize recyclable or renewable dimensional wood product and recyclable two-dimensional textile product or renewable, which can be collected in deposits 368 and 320, respectively. The heavy flux from the separator 364 can be enriched in heavy wet organics and can be delivered to the eddy current separator 330 and/or joined to the residues from the screens 328 and density separator 338.
[0121] Again with respect to the conveyor 344, the light intermediate flow of the density separator 342 can be processed by suspension magnet 372 to monetize a recyclable ferrous metal product collected in the tank 373. The part of the intermediate flow that passes under the magnet 372 and to vibrating feeder 374 is loaded into a series of eddy current separators 376 and 378, which process the intermediate flow to recover non-ferrous metals. Non-ferrous metals can be collected on conveyor 377 and compacted into packages using a 379 packer and then saved for shipment.
[0122] Unrecovered organics in eddy current separators 376 and 378 provide an enriched intermediate flow in paper and plastics. Interflow enriched in paper and plastics can be processed using a 2D-3D separator, such as a ballistic or angled disc screen separator or other type of 2D-3D 380 separator. The ballistic or angled disc screen separator or other type 2D-3D Separator 380 separates plastic and/or paper films (ie, 2D particles) from three-dimensional particles such as fractured rigid plastics. The 2D-3D separator can be placed before or after the pendant magnet 372 and eddy current separators 376 and 378.
[0123] Two-dimensional materials from ballistic or angled disc screen separator or other type of 2D-3D separator 380 can be delivered to conveyor 400 and the three-dimensional material can continue to be processed using optical classifiers. The three-dimensional material can be processed in a first optical classifier 382 to produce a HDPE plastic product or a PETE plastic product or a #3-7 plastic product that is deposited on quality control conveyor 383 and deposited on deposit 384 or packaged. in packer 385. The intermediate stream may then be processed in a second optical classifier 388 to produce a PETE plastic product or HDPE plastic product or #3-7 plastic product which is deposited on quality control conveyor 389 and deposited in the warehouse 386 or packed in packer 387. Finally, the intermediate waste stream can be processed in a third optical classifier 390 to produce a #1-7 plastic product or HDPE plastic product or recyclable PETE plastic products that is deposited on the shipping conveyor. quality control 391 and deposited in bin 392 or packed in packer 397. Remaining waste stream from classifiers optics 382, 388, and 390 can be a non-recyclable or renewable waste material or an improperly classified recyclable material (p. eg PVC, stones, sponge, electronic waste, liquid filled plastic bottle, fragment of an aluminum can, etc.), which can be retrieved on conveyor 393 and/or deposited in warehouse 395 or sent to a trailer transfer before being disposed of in a landfill or further separated into potentially recyclable fractions of mixed inorganic material and transformed into various building materials that can potentially be commercialized or used in building applications.
[0124] Regarding now the two-dimensional material received on the conveyor 400 of the ballistic or angled disc screen separator or other type of 2D-3D separator 380, the two-dimensional material can be an intermediate stream enriched in mixed film plastic and paper.
[0125] Two-dimensional materials can be loaded into a metering bin or other type of metric storage and feeding device 402 and then metered into a series of (eg 2-12) optical classifiers 404, which are configured to separate plastics from films and rigid plastics of paper. The 404 optical classifiers produce a highly concentrated recyclable or fuel 406 plastic film product and a 408 recyclable or renewable mixed paper product, each or both of which can be packaged and/or kept for sale or shipment.
[0126] Wet organics produced in system 300 (eg wet organics in tank 332) and any or all of the dry organics can be further processed using the conversion techniques described above. In one model, a plastic film product 406 or mixed plastic can be transferred to conveyor 430A and delivered to material storage silo 432. From the material storage silo, the plastic product can be processed into a renewable fuel, in a plastics conversion process 434. Alternatively, the plastic product can be crushed in crusher 436 and transported on conveyor 440 to a gasifier 442. Gasifier 442 can produce heat to drive turbine 444 and produce electricity or produce mechanical power. In an alternative design, mixed paper or mixed paper 408 or mixed paper and plastic can be transferred to conveyor 430 and delivered to gasifier 442.
[0127] Wet organics produced in system 300 (eg wet organics in bin 332) can continue to be processed, composted, provided to or sold to a processor as a highly concentrated mixed wet organics stream (eg wet organics in bin 332) . food waste and yard waste and green waste). Figure 7 illustrates models for converting wet organics into high-value products such as biogas or electricidae. The wet organics from deposit 332 are transferred to a metric/storage deposit 446 to be fed into a pre-processing apparatus 448. The pre-processing apparatus 448 may be a separator, such as a Scott turbo separator that has breakaway bars that break out particles to be introduced into anaerobic digester 450 and eject flexible items such as rubber and textiles, which can be ejected to conveyor 460 and sent to a waste dump 462 or delivered to conveyor 440 to be gasified, if appropriate.
[0128] The anaerobic digester 450 produces biogas and a digestion. The digestion can be dehydrated using a dehydrating apparatus 452. The separated digestion can be stored in a storage silo 454 or delivered to conveyor 440 to gasify in a gasifier 442. The digestion solids can be dried and/or compounded to produce a correction for ground.
[0129] The biogas produced in the 450 digester can be packaged before being burned in an internal combustion engine 458 to produce electricity. Biogas conditioner 458 can include an absorbent that absorbs pollutants and/or carbon dioxide. Electricity produced by a 458 combustion engine can be used on site for electrical components of the waste processing system and/or can be made available on an electrical grid for use by the consuming public. The biogas conditioner can be periodically regenerated to maintain its ability to absorb pollutants.
[0130] Dry organic fuel products can, for example, be used alone or with another fuel in place of coal and other carbon based fuels in a number of industrial energy production processes. Dry organic fuel can also be used as a fuel to make synthesis gas through various high temperature thermal conversion processes (eg gasification, plasma arc gasification and pyrolysis.) Dry organic material can also be saved on site in a silo-like building with an automated filling and unloading system or in storage silos with unloading devices.
[0131] Professionals in the field recognize that recyclable products produced using the methods described herein are highly enriched in a particular type of recyclable material, which makes the one or more different products useful as feed material in a recycling process. However, recyclable products are not normally 100% pure. While the recycling industry cannot use raw unprocessed waste, most recycling systems can operate properly with small amounts of impurities. The systems and methods of the invention are used to produce recycled products with a purity suitable for use in the recycling industry.
[0132] It is also desirable to transform recovered recyclables into new products, using conventional manufacturing techniques (eg pulp in paper production, production of aluminum ingots from aluminum cans, PETE bottle in bottle production PETE, PETE in insulation, HDPE in HDPE bottles or packaging materials, glass in building materials, etc.) versus selling recycled materials in conventional recycling markets.
[0133] Although it is desirable to recover the value of essentially all components of a solid waste stream, the present invention includes models in which all or a portion of the wet organic fraction, dry organic fraction or inorganic fraction is not completely separated into a recovered product. For example, in one model, all or a portion of the wet organic fraction, dry organic fraction or inorganic fraction, whether mixed or properly separated or inadequately separated, can simply be disposed of in landfills, depending on the purity of the particular fraction. and/or the market conditions for recycling the particular fraction (eg, the film can be disposed of in a landfill).
[0134] Although many of the methods and systems presented here have been described as including density separation, practitioners in the field recognize that in some models separation can be sufficiently achieved without density separation, as long as the waste stream is comminuted and sized to produce intermediate streams enriched in at least one recoverable material.
[0135] Additional models of the invention include systems and methods that incorporate one or more features of the systems and methods described in Provisional US Patent No. 611298,208, filed January 25, 2010; 611308,243 filed February 25, 2010; and 611417,216, filed November 24, 2010; and/or Non-Provisional U.S. Patent Application No. 12/897,996; all of which are incorporated herein by reference in their entirety.
[0136] The present invention can be incorporated in other specific forms without departing from its spirit or essential characteristics. The models described must be considered in all respects only as illustrative and not restrictive. The scope of the invention is therefore indicated more by the appended claims than by the foregoing description. Any changes in the sense and extent of equivalence of the claims must be accepted within its scope.

权利要求:
Claims (15)
[0001]
1. Method for processing mixed solid waste to improve energy extraction efficiency from wet and dry organic waste, characterized in that it comprises:- providing a mixed waste stream comprising at least 10% by weight of organic waste wets having a density greater than 12 lb/cubic ft and less than 140 lb/cubic ft and at least 10% by weight of dry organic waste with a density less than 12 lb/cubic ft and greater than 1.0 lb/cubic ft, wherein the wet organic waste and the dry organic waste are mixed;- separate the wet organic waste from the dry organic waste by size and density using at least two mechanical separators including a size separator and a density separator to produce a flow wet organic intermediate enriched in wet organic waste and an intermediate dry organic stream enriched in dry organic waste, where the separation includes sizing the mixed waste to to produce at least one sized waste stream with a bottom cut size greater than 2 inches and a top cut less than 18 inches and a top cut to short cut ratio is less than 6, and the scaled waste stream is separated by density using a density separator;- converting at least a portion of the intermediate wet organic flow to one or more renewable products, a soil amendment, a liquid fertilizer, a compost, energy or a combination thereof using at least a first conversion technique, e- converting the intermediate dry organic stream to one or more renewable products, a chemical compound product, energy or a combination thereof using at least a second conversion technique, wherein the second technique of Conversion is different from the first conversion technique.
[0002]
2. Method according to claim 1, characterized in that less than 40% by weight or less than 1% by weight of the mixed waste stream is separated as a recovered product using manual labor.
[0003]
3. Method according to claim 1, characterized in that the mixed waste stream includes at least 15% dry organic waste and at least 30% wet organic waste.
[0004]
4. Method according to claim 1, characterized in that at least 10% by weight of the mixed waste stream is a dry organic waste selected from the group consisting of three-dimensional plastic, plastic film, paper, cardboard, rubber , textiles and wood.
[0005]
5. Method according to claim 1, characterized in that at least 10% by weight of the mixed waste stream is a wet organic waste selected from the group consisting of food waste, animal waste, garden and green waste.
[0006]
6. Method according to claim 1, characterized in that the mechanical classifier comprises a size separator and a density separator.
[0007]
7. Method according to claim 1, characterized in that the efficiency of the mechanical separator has an efficiency of at least two metric tons per hour.
[0008]
8. Method according to claim 1, characterized in that the first conversion technique is selected from wet digestion, dry digestion, anaerobic digestion, aerobic digestion or composting.
[0009]
9. Method according to claim 1, characterized in that the first conversion technique produces biogas and the biogas is converted to a liquid fuel or electricity.
[0010]
10. Method according to claim 1, characterized in that the dried organic material is additionally dried using aerobic composting, air drying, solar drying, waste heat from the burning of biogas, and/or from the burning of dry organic material, before being converted by the second conversion technique or combinations thereof.
[0011]
11. Method according to claim 1, characterized in that the separation of the wet organic materials from the dry organic materials produces a dry organic material having less than 25% moisture content and the dry organic material is converted to a derived fuel waste.
[0012]
12. Method according to claim 1, characterized in that the second conversion technique includes compaction of the dry organic material and/or thermal oxidation of the dry organic material to produce electrical energy and/or heat.
[0013]
13. Method according to claim 1, characterized in that the mixed waste stream includes at least 20% by weight of low value material selected from the group consisting of: wet organic compounds, green waste, food waste, sand, less than 1 inch thick, asphalt, cement blocks, textiles, wood, rubber, plastic film, PVC, aluminum, stone, used consumer products, low-value glass, composite materials, and combinations thereof .
[0014]
14. Method according to claim 1, characterized in that the dry organic waste is enriched in plastics, the second conversion technique comprises classifying the dry organic material by separating three-dimensional plastics from two-dimensional plastics to produce a three-dimensional recyclable plastic product .
[0015]
15. Method according to claim 14, characterized in that the two-dimensional plastic is converted to a fuel and the three-dimensional plastic is recycled to form a plastic product.

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同族专利:

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公开号 | 公开日

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BR112014004919A2|2017-04-04|

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ES2829954T3|2021-06-02|

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CA2847289A1|2013-03-07|

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EP2750812B1|2020-08-05|

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HK1201491A1|2015-09-04|

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CN104023863B|2016-10-19|

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CA2847289C|2020-10-06|

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CN104023863A|2014-09-03|

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US8398006B2|2013-03-19|

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MX2014002376A|2014-10-24|

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US20120048974A1|2012-03-01|

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EP2750812A1|2014-07-09|

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CA3101302A1|2012-05-31|

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WO2013032516A1|2013-03-07|

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MX355900B|2018-05-03|

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EP2750812A4|2015-04-08|

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法律状态:
2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2020-07-14| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-06-29| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-09-14| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 30/12/2011, OBSERVADAS AS CONDICOES LEGAIS. |

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