WO2018183234A1 - Système et procédé de traitement biologique des eaux usées et de production de biogaz qui est converti en une source de carbone complémentaire utilisée dans le traitement biologique des eaux usées - Google Patents

Système et procédé de traitement biologique des eaux usées et de production de biogaz qui est converti en une source de carbone complémentaire utilisée dans le traitement biologique des eaux usées Download PDF

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Publication number
WO2018183234A1
WO2018183234A1 PCT/US2018/024431 US2018024431W WO2018183234A1 WO 2018183234 A1 WO2018183234 A1 WO 2018183234A1 US 2018024431 W US2018024431 W US 2018024431W WO 2018183234 A1 WO2018183234 A1 WO 2018183234A1
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WIPO (PCT)
Prior art keywords
biogas
primary
syngas
wastewater
biological
Prior art date
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PCT/US2018/024431
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English (en)
Inventor
Klaus Andersen
Herve Buisson
Hong Zhao
Richard DIMASSIMO
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Veolia Water Solutions & Technologies Support
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Application filed by Veolia Water Solutions & Technologies Support filed Critical Veolia Water Solutions & Technologies Support
Publication of WO2018183234A1 publication Critical patent/WO2018183234A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
    • C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
    • C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
    • C01B3/36—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using oxygen or mixtures containing oxygen as gasifying agents
    • C01B3/366—Partial combustion in internal-combustion engines
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/26—Composting, fermenting or anaerobic digestion fuel components or materials from which fuels are prepared
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/08—Production of synthetic natural gas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/20—Sludge processing

Definitions

  • the present invention relates to systems and processes for biologically treating wastewater such as systems and processes that nitrify and denitrify wastewater.
  • Biological treatment has been used for many years to treat wastewater.
  • primary treatment was employed to reduce the biological process reactor volume which had the effect of increasing the capacity of the biological process.
  • Some wastewater treatment plants were even built with only primary clarifiers because only BOD removal was required.
  • biological processes evolved, it became a common practice to use biological processes to remove nitrogen. But in biological processes aimed at removing nitrogen, primary treatment was utilized less. Without primary treatment, it was relatively easy to maintain an appropriate carbon-to-nitrogen ratio for biological denitrification. There is, however, a drawback to biological nitrogen removal processes that do not employ some form of primary treatment.
  • the problem is to provide a biological nitrogen removal process that provides a sufficient carbon-to-nitrogen ratio for efficiently denitrifying the wastewater and at the same time prevents the accumulation of excess suspended solids in the nitrogen removal process.
  • the present invention addresses these problems by actually producing readily biodegradable chemical oxygen demand (rbCOD) and directing it into the anoxic zone of a denitrification process.
  • rbCOD readily biodegradable chemical oxygen demand
  • rbCOD can readily be used for denitrification without hydrolysis, and relatively little of the rbCOD is consumed in the oxic zone.
  • the present invention provides a biological nitrogen removal process that employs primary treatment and which addresses the excess suspended solids problem discussed above. Moreover, the primary treatment employed produces primary sludge which, optionally with other sludges produced in the process, is employed to yield biogas which is ultimately converted to a clean biodegradable carbon source which serves as a supplemental carbon source to support biological denitrification.
  • the present invention also relates to a nitrification/denitrification process which recovers biogas from the anaerobic digestion of primary sludge and optionally other sludges produced in the overall process and converts the biogas to syngas which is then synthesized to form a carbon-containing liquid stream that is used as a supplemental carbon source for the benefit of denitrifying biomass.
  • the biogas is pre-treated to remove contaminants and optionally compressed. Thereafter the biogas is directed into a reformer where the biogas is converted to another gas, syngas, which includes hydrogen and carbon monoxide.
  • the reformer is an internal combustion engine.
  • the biogas, along with an oxidant, is directed into the internal combustion engine and through a partial oxidation reaction in the engine, the biogas is converted to syngas.
  • the syngas is synthesized to form a liquid stream which includes carbon in the form of readily biodegradable chemical oxygen demand (rbCOD), volatile fatty acids or methanol.
  • This liquid stream containing carbon is routed to the mainstream of the process where the carbon in the liquid stream is used to supplement the carbon in the wastewater stream to improve the efficiency of the biological process.
  • Figure 1 is a schematic illustration of a biological wastewater treatment process where biogas produced in the course of treating the wastewater is converted to a liquid stream containing carbon which is directed to a mainstream portion of the process.
  • Figure 1 A is a schematic illustration of a process similar to that shown in Figure 1 except that primary treatment includes the removal of primary solids with a drum filter.
  • Figure 2 is a schematic illustration of a biological nitrification/denitrification process where biogas produced in the course of anaerobically digesting sludge is converted to syngas which is in turn synthesized to form a liquid stream containing carbon that is directed to the anoxic zones of a nitrification/denitrification system.
  • Figure 2A is a schematic illustration similar to Figure 2 but showing an alternative biological nitrification/denitrification process.
  • the basic process of the present invention entails feeding a wastewater influent stream to a primary treatment unit where the wastewater undergoes primary treatment.
  • Primary treatment results in the production of a primary sludge and a primary effluent.
  • the primary effluent is directed to a biological treatment unit or system.
  • the focus of the biological treatment can vary. For example, it may include a
  • nitrification/denitrification process a process aimed at BOD removal or phosphorus removal.
  • the biological system or unit produces an effluent that is typically directed to a clarifier, which in turn produces a treated effluent and settled sludge.
  • a portion of the settled sludge is returned to the biological treatment unit as returned activated sludge (RAS).
  • RAS activated sludge
  • a portion of the return activated sludge is wasted.
  • the primary sludge produced in primary treatment along with potentially other sludges produced in the total wastewater treatment process, is directed to an anaerobic digester.
  • biogas is produced.
  • the biogas provides an indirect source for carbon that can be used to support biomass in the mainstream.
  • the processes described in this application use biogas produced in the anaerobic digester to ultimately produce a liquid stream that includes supplemental carbon that can be directed to the mainstream and used by the biomass performing biological treatment.
  • the biogas which is essentially methane and carbon dioxide
  • a syngas which includes hydrogen and carbon monoxide.
  • the syngas is converted to a liquid stream that includes carbon.
  • Various specific processes can be utilized to convert the syngas to rbCOD.
  • Particular forms of rbCOD are volatile fatty acids (for example, acetic acid) or methanol.
  • FIG. 1 shown therein is a schematic illustration depicting a biological wastewater treatment process.
  • the system and process is indicated generally by the numeral 10.
  • Wastewater influent is directed into a primary clarifier that removes primary solids (block 12).
  • the primary clarifier produces a primary effluent that is directed through line 14 to one or more biological reactors 16.
  • primary solids removed by the primary clarifier are directed through line 26 to an anaerobic digester 28.
  • Various biological wastewater treatments can be carried out in the biological reactors 16.
  • the biological reactors can perform nitrification and denitrification of the wastewater.
  • other biological processes such as BOD removal, phosphorus removal, are typically performed by biomass in biological reactors.
  • Biological reactors 16 produce a treated effluent that is directed to a secondary clarifier or settling tanks 18.
  • sludge including biomass and suspended solids
  • RAS return activated sludge
  • the return activated sludge is mixed with primary effluent to form mixed liquor that is directed into the biological reactors 16.
  • Some of the secondary sludge produced by the secondary clarifier or settling tanks 18 can be wasted.
  • this waste sludge referred to as waste activated sludge (WAS) is directed through line 24 where it is ultimately sent to the anaerobic digester 28.
  • WAS waste activated sludge
  • Secondary clarifier or settling tanks 18 produce a clarified effluent that is directed from the secondary clarifier or settling tanks via line 20.
  • treated effluent in line 20 is subjected to further treatment such as filtration and/or disinfection.
  • the sludge collected and sent to the anaerobic digester 28 is subjected to an anaerobic digestion process. After the sludge has been subjected to anaerobic digestion, it is directed from the anaerobic digester 28 via line 30 to further treatment such as dewatering. In the process of anaerobically digesting the sludge, biogas is produced in the anaerobic digester 28.
  • microorganisms While physical and chemical processes are used in wastewater treatment, biological treatment employing microorganisms in activated sludge is a main stay for removing certain nutrients from wastewater. In order to achieve efficient nutrient removal in biological treatment processes, it is important to have available a readily biodegradable carbon source for the microorganisms to use. Microorganisms utilize carbon as an energy source to drive metabolism and for the synthesis of new cellular material. As will be discussed in more detail below, a deficient carbon source in a wastewater stream is especially problematic in biologically denitrification and phosphorus removal processes.
  • the aim of the processes described herein is to utilize biogas produced in the anaerobic digestion process as an indirect supplemental carbon source. That is, the process of the present invention captures the biogas and converts the biogas to syngas which comprises hydrogen and carbon monoxide. Through a synthesis process, the syngas is converted to a readily biodegradable carbon source, sometimes referred to as rbCOD, which is directed to the mainstream and mixed with the wastewater or mixed liquor therein to supplement the carbon source in the wastewater.
  • rbCOD is produced and directed to the mainstream where the rbCOD functions as a supplemental carbon source for the biomass.
  • rbCOD are volatile fatty acids, such as acetic acid as well as methanol.
  • biogas produced by the anaerobic digester 28 is directed via line 32 to a biogas pre-treatment unit 34.
  • Biogas pre-treatment unit 34 removes impurities from the biogas including hydrogen sulfide gas, carbon dioxide and water vapor. After pre-treatment, the biogas may be compressed. After pre-treatment, the biogas is directed to a conversion unit 36. Here the biogas is converted to syngas.
  • Various systems and processes can be used to convert the biogas to syngas.
  • One approach is by an internal combustion engine having one or more cylinders, reciprocating pistons in the cylinders, an intake manifold, and an exhaust manifold. The biogas and an oxidant, such as air or oxygen, are directed into the engine.
  • the partial combustion of the biogas and oxidant in the engine results in the release of heat and the formation of syngas, a mixture of hydrogen and carbon monoxide.
  • Syngas produced by the engine may be compressed and sent to a chemical reactor, or in the case of one embodiment, an rbCOD synthesis reactor 40 where the syngas is converted to a liquid which contains readily biodegradable carbon.
  • the syngas through a synthesis process, can be converted to a liquid that contains rbCOD volatile fatty acids or acetic acid as well as methanol.
  • the combustion of the biogas in the internal combustion engine produces power that can be harnessed and utilized in and around the wastewater treatment facility.
  • the rbCOD resulting from the rbCOD synthesis reactor 40 is directed through line 42 to the biological reactors 16 where the rbCOD functions to supplement the carbon in the primary effluent being directed to the biological reactors 16.
  • Biological reactors 16 can perform various biological wastewater treatment processes. As discussed below, one particular biological process entails nitrification/denitrification. In that case, it may be preferable to convert the syngas to methanol and use the methanol as a supplemental carbon source for denitrification. Here, the methanol would be directed to one or more anoxic zones that perform denitrification. Another example of biological wastewater treatment is phosphorus removal.
  • Phosphorus removal processes can stand alone or can be used with other mainstream biological wastewater treatment processes.
  • biological phosphorus removal is usually facilitated by one or more reactors operated under anaerobic conditions.
  • rbCOD including volatile fatty acids or methanol
  • gasification a thermochemical process known as gasification
  • Biogas is subjected to elevated temperatures and pressures to form syngas.
  • the syngas can then be treated to remove impurities, such as tars and methane, and to adjust the hydrogen-to- carbon monoxide ratio.
  • the syngas can then be reacted over a catalyst and at elevated temperatures and pressure to form rbCOD.
  • FIG. 1A depicts a biological wastewater process that is similar in many aspects to that just described and shown in Figure 1 .
  • the main difference is that the primary treatment process shown in Figure 1 has been replaced with a primary treatment process that entails a drum filter 54.
  • wastewater is directed through a line to a coagulation tank 50. Upstream of the coagulation tank 50, a coagulant is added to the wastewater. The effluent from the coagulation tank is directed to a flocculation tank 52. Between the coagulation tank 50 and the flocculation tank 52, a flocculant polymer is added.
  • the effluent from the flocculation tank 52 is directed to a drum or rotary disc filter 54 which filters the primary solids from the influent wastewater stream and produces a primary affluent that is directed to the biological treatment reactors 16.
  • Primary solids captured by the drum or rotary disc filter 54 are directed through line 26 to the anaerobic digester 28.
  • biogas produced by the anaerobic digester 28 is converted to syngas which in turn is converted to rbCOD or a liquid that contains biodegradable carbon.
  • the wastewater stream or primary effluent is carbon deficient. Hence, there is insufficient carbon in the wastewater to completely denitrify the wastewater.
  • the biogas produced by an associated anaerobic digester 28 can be employed to ultimately produce rbCODmethanol which can be used to augment the carbon present in the influent to the nitrification/denitrification process. More particularly, the biogas is converted, in one embodiment by an engine reformer, to syngas and the syngas is converted to methanolrbCOD.
  • a wastewater influent stream is subjected to primary treatment upstream of the nitrification/denitrification unit.
  • the influent wastewater stream is mixed with a coagulant and a flocculent polymer and thereafter filtered by a microscreen filter 49.
  • Microscreen filter 49 produces a primary effluent and primary sludge.
  • the resulting primary sludge is directed from the microscreen filter 49 via line 54 to a primary sludge thickener 56 that thickens the primary sludge. Once the primary sludge is thickened, it is directed to the downstream anaerobic digester 28.
  • the nitrification/denitrification system includes multiple treatment zones.
  • a nitrification/denitrification system will include an oxic or aerobic zone and one or more anoxic zones.
  • the nitrification/denitrification system of this embodiment includes two anoxic (AX) or denitrification zones 60 and 62. Between the two denitrification zones 60 and 62 is an aerobic zone 64 that functions to nitrify the wastewater or mixed liquor passing therethrough.
  • a recycle line 66 extends from a downstream portion of the aerobic zone 64 to a point just upstream of the first anoxic zone 60.
  • a biological nitrification/denitrification process is a two-step process. In the first step, ammonia-nitrogen is converted to nitrate and nitrite. In the second step,
  • microorganisms oxidize carbon compounds - using nitrate as an electron accepter - which ultimately converts the nitrates to nitrogen gas.
  • Treated wastewater from the nitrification/denitrification system is directed to a clarifier
  • Clarifier 70 in conventional fashion produces a clarified effluent and sludge. Some of the sludge produced by the clarifier 70 is directed through return activated sludge line 72 to the mainstream where it is mixed with the primary affluent to form mixed liquor. Another portion of the sludge produced by the clarifier 70 is termed "waste activated sludge" and this is directed through line 74 to a waste activated sludge thickener 76 where the waste activated sludge is thickened. Once thickened, the waste activated sludge is directed through line 78 to the anaerobic digester 28.
  • the drawings depict settling tanks 18 and clarifier 70. It is understood and appreciated by those skilled in the art that various types of solids-liquid separators could be employed for the settling tanks 18 or the clarifier 70.
  • Clarified effluent is directed to tertiary filters 82. From the tertiary filters, the wastewater is directed to a disinfection unit 84 which produces a treated effluent. It is appreciated that various types of tertiary filters and disinfection units can be employed downstream of the nitrification/denitrification system. Moreover, other forms of treatment can be incorporated downstream of where nitrification and denitrification take place.
  • the nitrification/denitrification process shown in Figure 2 can be used in nitrification/denitrification processes where the primary effluent is deficient in carbon.
  • a deficiency in carbon means that there is insufficient carbon available to the biomass to completely denitrify the wastewater (or otherwise to completely biologically treat the
  • cBOD carbonaceous biological oxygen demand
  • Biogas produced by the anaerobic digester 28 is directed to a biogas holding tank 71 .
  • the biogas is directed along with an oxidant, such as air or oxygen, into an internal combustion engine reformer 92 as discussed in the case of the Figure 1 embodiment above.
  • Engine reformer 92 converts the biogas to syngas, hydrogen and carbon monoxide.
  • the syngas is then directed to a syngas reactor 94 where through a synthesizing process the syngas is converted to a carbon-containing liquid.
  • the aim is simply to convert the syngas to methanol.
  • the methanol is directed through line 96 to the anoxic zones 60 and 62 of the nitrification/denitrification system.
  • the methanol supplements the carbon supplied via the primary effluent and increases the carbon concentration in the influent to the nitrification/denitrification unit sufficient to enable the biomass to efficiently denitrify the wastewater.
  • the ratio of cBOD to TKN can be increased to 4 or more.
  • FIG. 2A shows another embodiment of the present invention. This embodiment is similar to the embodiment shown in Figure 2 and discussed above, except that in this embodiment a tertiary denitrification unit 81 is disposed downstream of the BNR reactors. As illustrated in Figure 2A, the rbCOD or methanol can also be directed into the tertiary denitrification unit 81.

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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Inorganic Chemistry (AREA)
  • Molecular Biology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
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Abstract

La présente invention concerne un procédé de traitement biologique où l'effluent entrant dans l'unité de traitement biologique pâtit d'un déficit en carbone. Une boue est récupérée du flux d'eaux usées et soumise à une digestion anaérobie qui produit un biogaz. Le biogaz est converti en gaz de synthèse par l'intermédiaire d'un reformeur à moteur à combustion interne. Par un procédé de synthèse, le gaz de synthèse est converti en un flux liquide contenant du carbone qui est utilisé comme source de carbone complémentaire dans le procédé de traitement biologique.
PCT/US2018/024431 2017-03-28 2018-03-27 Système et procédé de traitement biologique des eaux usées et de production de biogaz qui est converti en une source de carbone complémentaire utilisée dans le traitement biologique des eaux usées WO2018183234A1 (fr)

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US62/477,711 2017-03-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022007525A1 (fr) * 2020-07-10 2022-01-13 珠海九通水务股份有限公司 Procédé de traitement d'eaux usées basé sur un bassin multifonctionnel
US20220194831A1 (en) * 2019-04-02 2022-06-23 Argun Erdogan System and Method for Treating Wastewater That Includes Biosorption and Filtration

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2375353A (en) * 2001-01-25 2002-11-13 Watergem Ltd Catalytic production of methanol from biogas
US20030111410A1 (en) * 2001-12-18 2003-06-19 Branson Jerrel Dale System and method for extracting energy from agricultural waste
US20120085710A1 (en) * 2010-10-06 2012-04-12 Silicon Fire Ag Method and apparatus for providing and using hydrogen-based methanol for denitrification purposes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2375353A (en) * 2001-01-25 2002-11-13 Watergem Ltd Catalytic production of methanol from biogas
US20030111410A1 (en) * 2001-12-18 2003-06-19 Branson Jerrel Dale System and method for extracting energy from agricultural waste
US20120085710A1 (en) * 2010-10-06 2012-04-12 Silicon Fire Ag Method and apparatus for providing and using hydrogen-based methanol for denitrification purposes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220194831A1 (en) * 2019-04-02 2022-06-23 Argun Erdogan System and Method for Treating Wastewater That Includes Biosorption and Filtration
WO2022007525A1 (fr) * 2020-07-10 2022-01-13 珠海九通水务股份有限公司 Procédé de traitement d'eaux usées basé sur un bassin multifonctionnel

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