• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    The present invention relates to an integrated fixed membrane activated sludge batch reactor (10) in which both suspended biomass and biomass supported on biofilm carriers (16) are used to biologically treat wastewater received in the batch sequential reactor (10). The batch sequential reactor (10) comprises two hydraulically connected reservoirs (12, 14) with a suspended biomass contained in at least one reservoir (12) and a biomass supported on biofilm carriers (16) in the other reservoir ( 14).
    公开号:FR3020806A1
    申请号:FR1554086
    申请日:2015-05-06
    公开日:2015-11-13
    发明作者:Hong W Zhao；Michael Leon Gutshall；Glenn Thesing；Richard W Dimassimo；Magnus Christensson
    申请人:Veolia Water Solutions and Technologies Support SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a system and method for the treatment of wastewater and, more particularly, to a sequential batch reactor system with activated sludge. with integrated fixed membranes and associated methods. Sequential batch reactors (SBRs) have been used in wastewater treatment since the 1920s and are now used around the world. SBRs are widely used in the United States, China and Europe to treat both municipal and industrial wastewater. They are especially useful in applications with weak or variable flow models. There are other features of SBRs that make it a viable option in some cases. For example, where there is a limited amount of space, an SBR offers the opportunity to treat wastewater in a single tank, instead of multiple reservoirs. This allows the construction of wastewater treatment systems on a relatively small surface. In addition, SBRs can be controlled to provide aerobic, anaerobic and anoxic conditions for biological nutrient removal including nitrification / denitrification, nitrification alone and, in some cases, phosphorus removal. Biochemical oxygen demand (BOD) can be eliminated at relatively low levels. SBRs are effective for total nitrogen removal up to 5 mg / L. This is achieved by using aerobic conditions to convert ammonia to nitrates and nitrites (nitrification) and anoxic treatment of nitrates and nitrites to produce nitrogen gas (denitrification). All this can be obtained in the same tank. In some cases, SBRs can be used to reduce phosphorus levels to less than 2 mg / L by using anaerobic treatment. SBRs are a variation of the conventional "activated sludge" process. They differ from activated sludge plants in that SBRs generally combine processing steps and processes in a single tank or tank, whereas conventional activated sludge processes rely on multiple tanks. An SBR generally comprises four different stages or phases: (1) filling, (2) reaction, (3) sedimentation and (4) settling. During the filling phase, the tank receives the influent of wastewater. The influent provides food for microorganisms in activated sludge and creates an environment for biochemical reactions to take place. During the filling operation, the wastewater can be mixed and / or aerated. During the reaction or reaction phase, the biomass or bacterial flora in wastewater consumes nutrients. In one example, the SBR in the reaction phase is used under aerobic conditions. In this case, biomass performs a nitrification process by converting ammonia to nitrites and nitrates. In this process, the wastewater is aerated and mixed. The addition of oxygen to wastewater promotes the growth of aerobic bacteria. The sedimentation stage or phase follows the reaction phase. During this stage, the sludge formed by the bacteria is left to settle at the bottom of the tank. Generally, aerobic bacteria continue to multiply until dissolved oxygen is consumed. As the bacteria multiply and die, the sludge increases over time inside the tank and a residual activated sludge pump removes some of the sludge during the sedimentation stage for subsequent treatment. During the sedimentation stage, activated sludge is allowed to settle in resting conditions. No influent enters the tank and no aeration or mixing takes place. Activated sludge tends to sediment like a mass of flocs, forming an interface with the clear supernatant. Sometimes the mass of sludge is referred to as a bed of sludge. The sedimentation phase is an important part of the SBR cycle because, if the solids do not sediment rapidly, some sludge can be drawn off during the next settling phase and this will degrade the quality of the effluent. During the settling phase, a decanter is used to remove the clear supernatant effluent. In some cases, a floating clarifier is used. Floating decanters have an inlet port slightly below the water level to minimize the removal of solids in the effluent during the settling phase. Many SBR processes rely on a single reservoir and activated sludge where the biomass is suspended in a mixed liquor. These SBR designs have limited load capacity. In addition to the limited capacity of conventional SBR systems, there is a problem with many existing SBR systems used to date. Many existing SBR systems operate at full capacity or near full capacity. There are few viable options for improving or increasing capacity without building additional reaction tanks or settling basins. Therefore, there is a need to address the limited capacity of conventional SBR processes and, at the same time, to provide a viable option to increase the capacity of existing SBR units without requiring the construction of additional tanks. The present invention provides an integrated fixed membrane activated sludge (IFAS) batch sequential reactor (SBR) process in which suspended biomass and biomass supported on biofilm carriers are both used to biologically treat wastewater. received by the SBR. In one embodiment, the SBR comprises two tanks hydraulically connected with a suspended biomass that is contained in a reservoir and a biomass supported on biofilm carriers in the other reservoir. The process is carried out so that the suspended biomass and biomass supported on biofilm carriers are used effectively to increase the capacity of the SBR. Various processes, such as nitrification-denitrification, nitrification alone, phosphorus removal and BOD removal, can be performed in the IFAS SBR. In some of these processes, the filling, sedimentation and settling of the two tanks can be performed simultaneously. Moreover, the two tanks can be subjected to the reaction phase at the same time.
    [0002] In another embodiment, a ballast agent is added to one or more of the tanks to facilitate sedimentation of the sludge during the sedimentation phase. Flocks comprising biomass and other solids agglomerate around or attach to the weight agent forming weighted flocs. These relatively heavy ballasted flocs substantially increase the settling speed of the flocks. Other objects and advantages of the present invention will become apparent from reading the description below and the accompanying drawings which are purely illustrative of the invention and on which: Figure 1 is a schematic illustration of the sequential reactor IFAS batch of the present invention; Figure 2 is a schematic illustration similar to Figure 1, but showing a weighted flocculation system incorporated into the IFAS batch sequential reactor; and Figs. 3A to 3D are a sequence of views showing the basic phases of a process performed with IFAS batch sequential reactor of the present invention. With reference to the accompanying drawings, the integrated fixed membrane activated sludge (IFAS) batch reactor (SBR) of the present invention is shown and indicated generally by reference numeral 10. The SBR 10 comprises two tanks or basins, a first reservoir 12 and a second reservoir 14. The reservoirs 12 and 14 are separated by a wall 18. An opening 20 is provided in the wall 18 to allow the reservoirs 12 and 14 to be hydraulically connected. In the embodiment illustrated in FIG. the opening 20 is disposed around the lower portion of the wall 18. In other embodiments, the height of the opening 20 can be raised at various levels. For example, the opening 20 could be located just above the top of the deposited sludge layer. The second reservoir 14 comprises biological film media or supports 16. The medium 16 could be of the mobile type or of the fixed type. As will be appreciated by those skilled in the art, biomass-supporting biological film supports 16 are effective in the biological treatment of wastewater in the reservoir 14. The details of the biofilm carriers 16 are not discussed here in detail because they do not constitute a material per se for the present invention. For a more detailed and unified understanding of biofilm carriers and their role in the biological treatment of wastewater, reference is made to US Pat. No. 7,189,323. In one embodiment, the first reservoir 12 is not equipped. biofilm carriers 16 or a significant amount of biofilm carriers. In this embodiment the SBR process described here is based on a suspended biomass for biologically treating the wastewater in the first reservoir 12. It should be noted that, while there are biofilm carriers 16 in the second reservoir 14, the second tank would also generally include a suspended biomass. In cases where it is desirable to provide biofilm carriers 16 only in a single tank, it is appreciated that certain means are used to retain biofilm carriers in the tank and prevent them from moving or migrating into the tank. second tank. In the case of the embodiment shown in FIG. 1, the opening 20 is equipped with a screen whose openings are small enough to allow the wastewater to pass through but nevertheless retain the biological film supports. The two tanks 12 and 14 of the SBR 10 include the ability to aerate the wastewater therein. As shown in Figure 1, the two tanks are equipped with an air diffuser 28 disposed in the lower part of each tank. In one embodiment, there is provided a pair of blowers 30 for directing air into the air diffusers 28. It should be pointed out that in some wastewater treatment processes, no air is supplied to a generator. particular tank. Thus, the SBR 10 is provided with means for selectively controlling ventilation to each tank 12 and 14. In the case of the example shown in FIG. 1, two blowers 30 are arranged to direct air towards the tanks. 28. In some embodiments, it should be noted that a blower could be used to direct air to one or both of the tanks 12 and 14 and, in this approach, appropriate control means are provided to enable directing the air selectively towards one or the other reservoir 12 or 14. It is appreciated that the aeration of the wastewater causes the mixing of the wastewater. In one embodiment, the reservoir 12 is equipped with a mechanical mixer that can be selectively activated and deactivated depending on a particular method used. In a typical application, the wastewater to be treated by the SBR 10 is directed through an influent line 22 into the SBR 10. In the case of the embodiment illustrated here, the influent line 22 is directed In some processes, it is appropriate to recycle the wastewater from one tank to another tank. In the example of Figure 1, there is provided a recycling line 32 which extends from the second tank 14 to the first tank 12. Thus, the wastewater in the tank 14 can be recycled to the tank 12. The SBR 10 is also equipped with a decanting device. The settling device may be provided or designed to decant simultaneously from the two tanks 10 and 12. However, because of the opening 20 in the wall 18 and the fact that the tanks 12 and 14 are hydraulically connected, a A settling device disposed in a tank may be sufficient to decant the treated wastewater from the two tanks. In the example illustrated here, a single settling device is provided in the second tank 14. This settling device comprises a floating inlet 34 which is connected to an effluent line 36. During the settling phase, the treated wastewater enter and flow from the floating inlet 34 through the effluent line 36 and out of the SBR 10. Figure 2 shows an alternative embodiment for the SBR 10 shown in Figure 1 and treated above. In the embodiment of Figure 2, SBR 10 is provided with a weighted flocculation system to facilitate and increase the settling velocity of flocs formed during a process. The weighted flocculation system works by injecting a ballast agent into the wastewater. The ballast agent generally comprises inert granular particles such as microsand. As is appreciated by those skilled in the art, the flocs agglomerate or attach to the weight agent and, because of the weight of the weight agent, the flocs tend to sediment faster than in the sedimentation processes. conventional.
    [0003] By observing the weighted flocculation system shown in FIG. 2, it is apparent that there is a ballast agent input 38 associated with the SBR 10. The fresh ballast agent is routed through the feed agent input. ballast 38 in one of the SBR 10 tanks.
    [0004] The ballasted flocs, during the sedimentation phase, sediment in the tanks 12 and 14 and form a layer of sludge. The sludge comprising the weighted flocs is pumped from the SBR 10 through a pump 40 through a sludge line 42 to a solids separator. In one example, the solids separator is a hydrocyclone 44. The hydrocyclone 44 separates the slurry agent from the sludge and reroutes the separated slurry agent into the SBR 10 via slurry agent recycle lines. 46. In the example represented in FIG. 2, the recycled weighting agent is brought back into the two tanks 12 and 14. It is understood that, in many cases, it is simply necessary to recycle the ballast agent in a tanks. Sludge separated from the ballast by the hydrocyclone can be lost and / or subsequently treated. Turning to Figures 3A-3D, a typical SBR process is shown and illustrates in particular four basic phases of an SBR process: (1) filling, (2) reaction, (3) sedimentation and (4) settling. Figure 3A shows the filling phase. The wastewater is pumped into the reservoir 12. The wastewater passes from the reservoir 12 through the opening 20 into the wall 18 and flows into the reservoir 14. The level of the wastewater in the reservoirs 12 and 14 is usually the same 5. During the filling phase, the wastewater in the two tanks 12 and 14 rise together. A control valve associated with the settling device is closed and the aeration of the tanks can be activated or deactivated. As will be discussed later, the biological treatment of the wastewater can begin during the filling phase. After the filling phase, the SBR 10 is used in a reaction phase. See Figure 3B. This is the stage of the process in which the wastewater is biologically treated. For example, as explained successively herein, SBR can be used to perform a nitrification / denitrification process or a nitrification process alone. In both cases, the biochemical oxygen demand, BOD, can be removed from the wastewater. During the reaction phase, the settling valve is closed and the tank 12 or 14 may be provided with aeration. After the reaction phase, SBR 10 is used in a sedimentation phase. Mixing and aeration are disabled and the decant valve is closed. The biofilm carriers 16 are relatively heavy, i.e. they are of the flowing type and they sediment together with the suspended biomass. As shown in FIG. 3C, the biofilm carriers 16 in the reservoir 14 are deposited at the bottom of the reservoir 14. A sludge layer comprising flocs is formed above the deposited biofilm carriers 16. In a typical method, the sludge layer and deposited biofilm carriers 16 will occupy approximately 5075% of the volume of the reservoir 14. The sludge layer alone in the reservoir 12 in a typical process will occupy approximately 40-70% of the volume of the reservoir 1. Because the SBR tank is usually relatively large, the average fill percentage should generally not exceed 30%. Generally, the fill percentage for the medium should be from about 10% to about 20%. Figure 3D illustrates the settling phase. Mixing and aeration are disabled and the decant valve is open. In this embodiment, the floating inlet 34 is disposed in the second tank 14 and the treated supernatant, shown in Figure 3C, is decanted. In some cases, the two tanks 12 and 14 can be decanted simultaneously using a floating inlet and an effluent line in the two tanks 12 and 14. Generally, it is considered that a settling from a tank is effective to provide the collection of treated wastewater from both tanks. As explained above, SBR 10 can be used to perform various biological wastewater treatments such as nitrification / denitrification and nitrification alone. It may be useful to review how SBR 10 performs a nitrification / denitrification process. In this case, a suspended biomass is maintained in the reservoir 12. Both the biofilm carriers 16 and the suspended biomass are maintained in the reservoir 14. The fixed biomass is supported on the biofilm carriers 16. During the filling phase, the wastewater is conveyed into the tank 12 and, from the tank 12, the wastewater moves through the opening 20 in the tank 14. No air is delivered into the tank 12 while the tank 14 is ventilated. Generally, the reservoir 12 is maintained under anoxic conditions while the reservoir 14 is maintained under aerobic conditions. It should be noted that during the filling process, the biochemical oxygen demand, BOD, or a substantial portion of the BOD in wastewater that is directed into the tank 12 is removed during the filling process. Normally, in some embodiments, at least 30% of the BOD is removed from the wastewater before reaching the second reservoir 14. Typically, about 30% to about 50% of the BOD is removed before reaching the second reservoir. 14. Generally, all or substantially all the chemical oxygen demand, COD, readily biodegradable is removed in the first tank 12 before the wastewater reaches the second tank 14. The reduction of the BOD concentration and the removal of the COD readily biodegradable can be obtained with a relatively low volume. For example, in one embodiment, the volume of the first reservoir 12 may be 10-30% of the total reactor volume. The meaning of this will be dealt with later. Thus, even during the filling phase, the tank 14 performs a nitrification process. Specifically, the ammonia in the wastewater in the reservoir 14 is converted into nitrates and nitrites by the biomass in the reservoir 14. A substantial portion of the nitrification process is carried out by the biomass supported on supports 16 because this biomass is particularly effective in a nitrification process. The reservoir 12, which is used under anoxic conditions, even during the filling phase, performs a denitrification; specifically, the biomass suspended in the reservoir 12 converts nitrates and nitrites to nitrogen gas. This occurs because a portion of the nitrified wastewater in the reservoir 14 is recycled via the line 32 of the second reservoir 14 to the first reservoir 12. This basic nitrification and denitrification process using an integrated fixed membrane activated sludge process is extended in the reaction phase. As occurred during filling, in the reaction phase, the biomass supported on the biofilm carriers 16 in the second reservoir 14 performs a nitrification process and a portion of the wastewater that has been nitrified in the reservoir 14. is recycled to the tank 12, which is used under anoxic conditions and denitrifies the wastewater inside. After the reaction phase, SBR 10 is used in the sedimentation and settling mode as explained above. In a nitrification / denitrification process, it may be advantageous to design the process so that all or a substantial portion of the BOD (meaning at least about 30% of the BOD in the influent) is removed from the wastewater before it is removed. This tends to allow autotrophic microorganisms to proliferate and dominate and thereby improve the overall efficiency of nitrification. Thus, in the illustrative nitrification / denitrification process described above, it is advantageous to remove the BOD in the wastewater in the reservoir 12 before the wastewater reaches the nitrification reservoir 14. Although the schematic illustrations suggest that reservoirs 12 and 14 comprise a generally equal volume, it should be noted that in some processes, a reservoir may have a volume greater than the other. For example, in the nitrification / denitrification process just described, it is contemplated that in some cases it is advantageous to provide the nitrification reservoir 14 with a larger volume than the first reservoir 12. The reason is that a volume it may be necessary to nitrify more effectively than can be necessary to denitrify.
    [0005] SBR 10 can also remove phosphorus from influent wastewater. For example, in the nitrification / denitrification process described above, the reservoir 12 operates under anoxic conditions, meaning that there are nitrates and nitrites available for the microorganisms in the reservoir. However, the whole process can be controlled so that the nitrites and nitrates in the tank 12 can be exhausted. When this occurs, the reservoir 12 then begins to operate under anaerobic conditions that are suitable for phosphorus removal. What has been described above is a two-stage IFAS SBR. There are many advantages for the two-stage IFAS SBR compared to a conventional one-stage SBR. The following is a comparison of these two SBR systems for a nitrification process only and a nitrification / denitrification process. Nitrification only A conventional SBR and a two stage IFAS SBR are designed to treat typical domestic wastewater with the following characteristics: CBODINF = 250 mg / L; TSSINF = 250 mg / L; TKNINF 40 mg / L; TINF = 8 ° C The target effluent qualities are: CBODEFF = 10 mg / L; TSSEFF = 10 mg / L; NH4EFF 1.0 mg / L; NO3EFF = None Conventional SBR for nitrification uses a single reactor with a single aerobic phase plus sedimentation and decantation. The two-stage IFAS SBR uses two zones, both under aerobic conditions. The first zone is only activated sludge without support and the second zone is loaded with biological film supports.
    [0006] Typical designs are summarized in Table I below to demonstrate the characteristics of the two-stage IFAS system. The first zone of the IFAS SBR is sized to remove readily biodegradable organics in the influent, which will improve the rate of surface removal of ammonia on biofilm carriers in the second zone.
    [0007] TABLE I SBR SBR IFAS to conventional two-storey single stage Flow rate, million 2.65 (0.7) 3.79 (1.0) liters (gallons) per day Total tank volume 1.82 (0.48) 1.82 (0.48) reactor, million liters (gallons). Fraction of the first NA 0.15 zone relative to the total Retention time 16.5 11.5 hydraulic, hour Cycle time Total, Tc, 6.0 4.0 hours Tc = Tp + Ts + TD Duration of the Phase 0.75 0.75 sedimentation, Ts, hour Phase duration 0.5 0.5 decantation, TD, hour Phase duration 4.75 2.75 Process, Tp, hour Tp = TF + TR Duration Phase 1 to 4.75 1 to 2.75 filling, TF, hour Phase duration from 3.75 to 0.0 1.75 to 0.0 reaction, TR, hour Volume index of 120 120 sludge Materials solids in 4100 3700 mixed liquor, MSLM, at upper water level Fraction of second zone NA 0.85 Percentage of load in NA 0.2 supports in second zone,% Total retention time 12.3 8.0 of substances suspended solids, TRMST, day TRMS process, TRMSP, day 9.7 5.5 TRMS in oxic medium, 9.7 5.5 TRMSoxic, j Sludge yield, lb-0.92 0.86 Total Suspended Suspended matter / lb-BOD Oxygen Demand 1.48 1.38 Specific, lb-02 / lb-DBO Recy Flow Rate % NA 300% influent Total F / M ratio, kg-0.11 0.20 BOD / kg-MSLM / d Nitrification / Denitrification Conventional SBR and two-stage IFAS SBR are designed to treat wastewater typical household with the following characteristics: CBODINF = 250 mg / L; TSSINF 250 mg / L; TKNINF 40 mg / L; TINF = 8 ° C The target effluent qualities are: CBODEFF = 10 mg / L; TSSEFF = 10 mg / L; NH4EFF 1.0 mg / L; NO3EFF = 8.0 mg / L Conventional SBR for nitrification and denitrification uses a single reactor with anoxic and oxic (aerobic) phases plus sedimentation and decantation. The two-stage IFAS SBR uses the first zone under anoxic conditions and the second zone under aerobic or oxic conditions. The first zone is only activated sludge without support and the second zone is loaded with biological film supports. Typical designs are summarized in Table II below to demonstrate the characteristics of the two-stage IFAS system. The first zone of the SBR IFAS is sized to achieve denitrification to meet the effluent nitrate requirements, which will improve the rate of ammonia removal on media media in the second zone. TABLE II Conventional SBR SBR IFAS Single Stage Two Stage Flow Rate, Million 2.65 (0.7) 3.79 (1.0) liters (gallons) per day Total Tank Volume 2.20 (0.58) 2.20 (0.58) reactor, million liters (gallons) Fraction of the first NA 0.25 zone (anoxic) compared to total Phase fraction 0.25 NA anoxic compared to the total process Retention time 20, 0 13.9 hydraulic, time Total Cycle Time, Tc, 6.0 6.0 Tc = Tp + Ts + TD Phase Time 0.75 0.75 Sedimentation, Ts, Time Phase 0 Duration , 0.5 decantation, TD, hour Phase duration 4.75 4.75 Process, Tp, hour Tp = TF + TR Phase duration from 1 to 4.75 1 to 4.75 filling, TF, hour Phase time 3.75 to 0.0 3.75 to 0.0 reaction, Tg, hour Volume index of 120 120 sludge Solid matter in 4467 3400 mixed liquor, MSLM, during the reaction phase Fraction of second zone NA 0.75 (oxic) Percentage of charge in NA 10% supports in the second zo no,% Total retention time 17 10.5 suspended solids, TRMST, day TRMS process, TRMSP, day 13.5 8.3 TRMS in oxic medium, 10.1 6.2 TRMSoxic, day Sludge yield, lbs - 0.87 0.76 Total Suspended Solids / lb-BOD Recycling rate,% NA 300% influent R = Vo / VF 2.3 NA Total F / M ratio, kg-0.085 0.16 BOD / kg It should be pointed out that for a nitrification-denitrification application, a conventional SBR may have to increase the total reactor volume to achieve the recycling flow required for denitrification (R = Vo / VF = 3 or 4). ). This means that a conventional SBR must be used with a short cycle time. The IFAS SBR of the present invention with recycling will eliminate this requirement. For more stringent effluent requirements, a conventional SBR and SBR IFAS, as described herein, will both operate with a short cycle. For this case, the IFAS SBR of the present invention will be more desirable than a conventional SBR.
    [0008] The present invention also relates to the renovation of existing SBRs. As explained above, many existing SBRs are at or near capacity. These SBRs may comprise a single tank or, in some cases, the SBR could include several tanks. The present invention contemplates the segmentation of these reservoirs and the provision of an integrated fixed membrane activated sludge process to be performed in two tanks or pairs of tanks. Specifically, existing tanks are equipped with a wall which has an opening, which can effectively form two tanks or basins from a single tank or basin. One of the segmented reservoirs that is formed is specifically designed to hold biofilm carriers 16 while the other reservoir is designed to perform processes based on suspended biomass. This will increase the efficiency of biological treatment in these existing SBRs without the need for new reservoirs and without increasing the surface area of SBRs. The reason is that the IFAS SBR process described here has a higher capacity for biologically treating wastewater on a unit area basis than conventional SBR processes.
    [0009] Of course, the present invention may be executed in other ways than those specifically set forth herein without departing from the essential features of the invention. The present embodiments are to be considered in all respects as illustrative and not restrictive, and all variations within the meaning and equivalence of the appended claims are intended to be incorporated herein.
    权利要求:
    Claims (12)
    [0001]
    REVENDICATIONS1. A method for the treatment of wastewater in an integrated fixed membrane activated sludge batch reactor (10) having first and second hydraulically connected reservoirs (12, 14), the method comprising: filling the first and second tanks (12, 14); 14) with wastewater; biological treatment of the wastewater in the batch sequential reactor (10) employing an integrated fixed membrane activated sludge process comprising: i. biological treatment of the wastewater in the first reservoir (12) with a suspended biomass; ii. biological treatment of the wastewater in the second reservoir (14) with biomass supported on moving biofilm carriers (16) contained in the second reservoir (14); sedimentation of suspended biomass and biofilm carriers (16); and decanting the wastewater in the first and second reservoirs (12, 14) of the batch sequential reactor (10).
    [0002]
    2. The method of claim 1 comprising: denitrifying the wastewater in the first reservoir (12) using the suspended biomass; nitrifying the wastewater in the second reservoir (14) using the biomass supported on the biofilm carriers (16) and the biomass in suspension; and recycling at least a portion of the wastewater into the second reservoir (14) to the first reservoir (12).
    [0003]
    The method of claim 1 comprising adding a weighting agent to the wastewater in the batch sequential reactor (10) and attaching flocs suspended in the wastewater to the ballast agent; and sedimentation of the ballast agent having the suspended flocs fixed thereon.
    [0004]
    4. The method of claim 1, comprising using biomass suspended in the first reservoir to remove biochemical oxygen demand (BOD) from the wastewater; and the use of biomass supported on biofilm carriers (16) and biomass suspended in the second reservoir to nitrify wastewater.
    [0005]
    5. Method for increasing the load capacity of an existing batch batch reactor comprising at least one tank, comprising: dividing the tank by dividing the tank into two separated areas by a wall which is inserted into the batch sequential reactor tank (SBR) and the arrangement of the two zones to be hydraulically connected so that treated wastewater can flow from one area to another; configuring the two zones so that biofilm carriers can be placed in one area and retained in one area and prevented from moving into the other area; and disposing at least one settling outlet for decanting the two zones.
    [0006]
    The method of claim 1 comprising injecting a ballast agent into at least one of the reservoirs (12, 14); sedimentation of suspended flocs and ballast in at least one of the reservoirs (12, 14), wherein at least some of the suspended flocs attach to the ballast which facilitates the settling velocity of the flocs. ; decanting the first and second tanks (12, 14) to remove treated wastewater therefrom; and removing the fixed ballast and floc from one or more tanks (12, 14) and separating the ballast agent from the suspended flocs and recycling at least a portion the ballast agent is separated to at least one of the tanks (12, 14).
    [0007]
    7. Method according to claim 6, comprising simultaneously filling the two tanks (12, 14) of the sequential batch reactor (10) with wastewater to be treated and the simultaneous settling of the treated water from the two tanks (12, 14).
    [0008]
    8. The method of claim 6, comprising the biological denitrification of the wastewater in the first reservoir (12) with the suspended biomass; nitrification of the wastewater in the second reservoir (14) using the biomass supported on the biofilm carriers (16) and the biomass in suspension; and recycling at least a portion of the wastewater from the second reservoir (14) to the first reservoir (12). 10
    [0009]
    The method of claim 6, wherein during filling of the batch batch reactor (10), the method comprises using the first tank (12) under anoxic conditions and using the second tank (14) in aerobic conditions; and recycling at least a portion of the wastewater from the second reservoir (14) to the first reservoir (12). 20
    [0010]
    The method of claim 1 comprising: charging the first and second reservoirs (12, 14) with a ballast agent and wherein the biomass suspended in the batch sequential reactor (10) attaches to the ballast agent; The sedimentation of the weighting agent and the suspended biomass fixed in the batch sequential reactor (10); decanting the treated wastewater into the first and second reservoirs (12, 14) of the batch sequential reactor (10); anddelivery of the bound slurry batch ballast and biomass agent (10) and separating the ballast agent from the suspended biomass and recycling at least a portion of the slurry. ballast agent separated to the batch sequential reactor (10).
    [0011]
    11. Method according to claim 10, comprising the simultaneous decantation of the wastewater from the first and second reservoirs (12, 14) and, during the decantation of the wastewater, the elimination of at least a part of the agent of ballast and fixed slurry biomass of the batch sequential reactor (10).
    [0012]
    The method of claim 10, wherein the batch sequential reactor (10) is used under conditions that nitrify and denitrify the wastewater and wherein the method comprises using the first reservoir (12) under anoxic conditions so that suspended biomass denitrifies wastewater; and using the second reservoir (14) under aerobic conditions such that the biomass supported on the biofilm carriers (16) and the biomass in suspension nitrifies the wastewater therein; and recycling at least a portion of the wastewater from the second reservoir (14) to the first reservoir (12).
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    同族专利:
    公开号 | 公开日
    AU2015256436B2|2018-10-04|
    EP3140258A1|2017-03-15|
    WO2015171374A1|2015-11-12|
    JP2017514681A|2017-06-08|
    US20150321937A1|2015-11-12|
    AU2015256436C1|2019-01-24|
    CA2948330A1|2015-11-12|
    SG11201609271YA|2016-12-29|
    KR20160146944A|2016-12-21|
    AU2015256436A1|2016-11-17|
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    法律状态:
    2016-05-26| PLFP| Fee payment|Year of fee payment: 2 |
    2017-03-21| PLFP| Fee payment|Year of fee payment: 3 |
    2018-03-21| PLFP| Fee payment|Year of fee payment: 4 |
    2020-02-14| ST| Notification of lapse|Effective date: 20200108 |
    优先权:
    申请号 | 申请日 | 专利标题
    US14/271,579|US20150321937A1|2014-05-07|2014-05-07|Method and system for treating wastewater in an integrated fixed film activated sludge sequencing batch reactor|
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