• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a system and method intended to make useful use of the hot water flow released by the AHPD process that has been patented by Zagt Zelf BV and for which a patent has been granted on October 13, 2010 under number 1037103. stream contains a number of potentially valuable components, such as gases, dissolved heavy metals, nutrients and fatty acids, that can be recovered and / or reused using the present invention.
    公开号:NL1041706A
    申请号:NL1041706
    申请日:2016-02-02
    公开日:2016-12-22
    发明作者:Christiaan Emanuel Zagt Ir
    申请人:Kirsten Zagt；
    IPC主号:
    专利说明:

    System and method for the after-treatment of a water or permeate stream that is separated by a high-pressure digester in which gases are dissolved under pressure.
    The present invention relates to a system and method intended to make useful use of the hot water stream released by the AHPD process patented by Zagt Zelf BV and patented on October 13, 2010 under number 1037103. R.E.F. Lindeboom wrote a dissertation about the AHPD process (ISBN 978-94-6173-860-8) that was successfully defended on 27 February 2014 at Wageningen University. AHPD is a continuous process in which wet organic substrates (such as biomass, sewage sludge and / or waste water) are injected and converted into water, carbon dioxide, methane gas and other products by anaerobic biocatalysis. AHPD produces green gas with a methane content of 80-99% from organic substrates under biologically built up pressure through biological fermentation. Due to Henry's law, unwanted components such as carbon dioxide and hydrogen sulphide are dissolved in the water phase to a greater extent in green gas. After separation of the digested sludge, the aqueous phase is discharged from the AHPD reactor while the particles remain inside as much as possible. If a separation technique is applied here, such as a filter or membrane in an advantageous embodiment, the resulting water flow is called "permeate". After reducing the pressure of this water stream or permeate by, for example, a restriction, a pressure exchanger, or another advantageous embodiment, the gases dissolved under pressure are released from the water stream or the permeate. This gas mixture consists mainly of carbon dioxide (CO2), but also contains a fraction of hydrogen sulphide (H2S), a fraction of methane (CH4) and a fraction of ammonia (NH3). In an advantageous embodiment, this pressure-reduced stream is introduced at the top of a gas stripper with the aim of removing the gases from the water or permeate as much as possible. In addition, the pH of the water rises to around 8-14 due to the acid gases leaving. If necessary, recirculation and / or advantageous design is provided in the stripper to improve the gas discharge process.
    In an advantageous embodiment, the gas stream containing combustible gases such as H 2 S, CH 4 and NH 3 is biologically oxidized, for example elemental sulfur is formed, or a torch is burned, which in an advantageous embodiment acts as a bubble column with a spark of rain at the top of the gas space. H 2 S is converted into H 2 SO 4 (sulfuric acid), which dissolves in the water of the bubble column. This sulfuric acid solution can be reused to lower the pH of the remaining water which is called "effluent" after the degassing. The heat produced in the torch can be used in an advantageous embodiment for heating the AHPD process to a preferred temperature of about 34 to about 55 ° C.
    The degassed permeate has a high buffer capacity for acids and is therefore partly recirculated through the AHPD installation, to stabilize the pH of the AHPD process by buffering and at the same time to remove extra CO2.
    Due to the high pH after removal of the acid gases, the permeate is extremely suitable for producing valuable raw materials such as CaPO 4 or struvite without further pH increase. Therefore cheaper chemicals than usual are useful: CaCl and / or MgCl instead of the respective hydroxides, because the pH no longer needs to be raised.
    The resulting degassed permeate then goes to the Baron reactor in an advantageous embodiment. Baron is the name of Bareau's limited oxygen supply anammox reactor, which is intended to remove nitrogen from the permeate biocatalytically.
    After the Baron reactor, heat can still be recovered from the permeate stream before the remaining stream can finally be discharged as effluent to the sewer or surface water, depending on the situation.
    In the attached figures 1 and 2 the test results of Zagt Zelf BV and Bareau BV of the AHPD process are described in outline. Figure 3 shows the AHPD process diagram.
    A number of scientific publications and presentations have been included in the reference list in which a number of important research results on the AHPD process are included.
    In an advantageous embodiment, the system comprises a discharge line through which the water or permeate is discharged from the AHPD reactor, whether or not via a filter or a membrane. The system also contains a component that reduces the pressure of the water or permeate so that the dissolved gases exit. The system contains a component that promotes the release of the gases, such as a stripper with or without recirculation. The system contains a component that converts hydrogen sulphide and methane to sulfur or sulfuric acid and carbon dioxide through combustion or an alternative method of oxidation. The system contains a measurement and control system to coordinate and monitor the various process steps.
    Literature list
    Scientific publications
    Autogenerative high pressure digestion: Anaerobic digestion and biogas upgrading in a single step reactor system. Water Science and Technology, 64 (3), 647-653.
    Lindeboom, R.E.F., Weijma, J., and van Lier, J.B., (2012). High-calorific biogas production by selective CO2 retention at autogenerated biogas pressures up to 20 bar.
    Environmental Science & Technology, 46 (3), 1895-1902. Lindeboom, REF, Ferrer I., Weijma, J. and van Lier JB, (2013) Silicate minerals for CO2 scavenging from biogas in Autogenerative High Pressure Digestion, Water Research, DOI: http://dx.doi.org/10.1016/ j.watres.2013.04.028.
    Conference proceedings
    Anaerobic Fermentations, Goldschmidt Conference, Knoxville, Tennessee, USA (poster).
    Lindeboom, R.E.F., Fermoso, FG, Weijma, J, Zagt, K & Lier, JB van (2010). Autogenerative high pressure digestion: a new concept for biogas upgrading. In s.n. (Ed.), IWA world conference on anaerobic digestion (pp. 1-8). Guadelajara: IWA.
    Lindeboom, R.E.F., Fermoso, F.G., J. Weijma, K. Zagt and J.B. van Lier (2010). Autogenerative High Pressure Digestion: anaerobic digestion and biogas upgrading in a single step reactor system. In: Proc. Or IWA Int. Water and Energy Conference, November 10-12, 2010, Amsterdam, The Netherlands.
    Lindeboom R.E.F. , Weijma J., Zagt, K., and J.B. van Lier, 2011, 'Biogenic Natural Gas' Formation in a Pressurized Lab Scale Reactor, Goldschmidt Conference, Prague, Czech Republic.
    Lindeboom R.E.F, Zagt, C.E., Weijma, J., and van Lier, J. B., 2011, Operational implications of Autogenerative High
    Pressure Digestion, IWA-Young Water Professionals conference, Leuven, Belgium.
    Lindeboom R.E.F., 2013, High pressure digestion, 65th holiday course in Drinking water and Waste water, TuDelft.
    Professional literature and reports
    Zagt, K., Barelds, J., Lindeboom, R., Weijma, J., Plugge, C., Van Lier, J. (2010) Energy from sewage water and kitchen waste at high pressure, H20.
    权利要求:
    Claims (5)
    [1]
    A system for separating and reusing various types of molecules such as gases and dissolved salts, from the water or permeate phase produced by a high pressure fermentation process such as AHPD, the system comprising: at least one discharge line in which water or permeate with dissolved gases therein and pressurized salts from a high pressure fermentation system such as AHPD; energy generating means for reducing the pressure, possibly in combination with the useful application and reuse of pressure for other processes; a process to promote the removal of dissolved gases after pressure reduction; a process to promote the crystallization of dissolved salts after the pressure of the permeate is lowered and the pH of the permeate has risen. an operating system for controlling the process;
    [2]
    System according to claim 1, in which gasses such as methane and hydrogen sulphide are converted by means of an oxidation process in which heat is released.
    [3]
    A system according to claim 1 or 2 wherein energy generating means are included to recover and reuse the heat from the water or permeate.
    [4]
    A system according to claim 1, 2 or 3, wherein additional chemicals are metered for the purpose of recovering or removing dissolved substances such as ammonium and / or phosphate and / or heavy metals from the aqueous phase.
    [5]
    A method for treating a water or permeate stream comprising the steps of: Providing a system according to one or more of claims 1-5; Separating dissolved salts and / or gases from a water or permeate stream; The reuse of these dissolved substances and of heat.
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    同族专利:
    公开号 | 公开日
    NL1041706B1|2018-04-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2019-10-09| MM| Lapsed because of non-payment of the annual fee|Effective date: 20190301 |
    优先权:
    申请号 | 申请日 | 专利标题
    NL1041363|2015-06-16|
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