WO2014107560A2 - Bioréacteur discontinu séquentiel à membrane - Google Patents

Bioréacteur discontinu séquentiel à membrane Download PDF

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Publication number
WO2014107560A2
WO2014107560A2 PCT/US2014/010147 US2014010147W WO2014107560A2 WO 2014107560 A2 WO2014107560 A2 WO 2014107560A2 US 2014010147 W US2014010147 W US 2014010147W WO 2014107560 A2 WO2014107560 A2 WO 2014107560A2
Authority
WO
WIPO (PCT)
Prior art keywords
tanks
wastewater
influent
flow
membrane module
Prior art date
Application number
PCT/US2014/010147
Other languages
English (en)
Other versions
WO2014107560A3 (fr
Inventor
Thomas M. Pokorsky
David Donald LAUER
Richard P. GANNON
Original Assignee
Aquarius Technologies Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aquarius Technologies Inc. filed Critical Aquarius Technologies Inc.
Publication of WO2014107560A2 publication Critical patent/WO2014107560A2/fr
Publication of WO2014107560A3 publication Critical patent/WO2014107560A3/fr

Links

Classifications

    • 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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • C02F3/1273—Submerged membrane bioreactors
    • 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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1263—Sequencing batch reactors [SBR]
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • 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
    • C02F2303/16—Regeneration of sorbents, filters
    • 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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • C02F3/1284—Mixing devices
    • 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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/208—Membrane aeration
    • 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

Definitions

  • the invention relates to a wastewater treatment system and methods of treating wastewater.
  • Sequencing batch reactors or sequential batch reactors are processing systems for the treatment of wastewater.
  • SBR systems treat wastewater in batches.
  • Oxygen is bubbled through the wastewater to allow for the biological reduction of biochemical oxygen demand (BOD) and chemical oxygen demand (COD) to render the wastewater suitable for discharge into lakes and streams.
  • BOD biochemical oxygen demand
  • COD chemical oxygen demand
  • MBR membrane bioreactor
  • MBR membrane bioreactor
  • MBR systems When used with domestic wastewater, MBR systems can produce effluent of sufficiently high quality to be discharged to coastal, surface or brackish waterways or to be reclaimed for urban irrigation.
  • MBRs take up less space with a relatively small footprint, and MBRs also may be installed as a retrofit and upgrade of existing wastewater treatment plants.
  • MBRs it is possible to operate MBR systems at a relatively higher mixed liquor suspended solids (MLSS) concentrations compared to conventional settlement separation systems, thus reducing the reactor volume to achieve the same treatment capacity.
  • MMS mixed liquor suspended solids
  • the invention is directed to a wastewater treatment system, as well as methods of treating wastewater.
  • the invention uses the basic principles of the SBR system design, but results in a higher effluent quality of the MBR system design.
  • a wastewater treatment system may include a membrane bioreactor system and a sequential batch reactor system, wherein the membrane bioreactor and the sequential batch reactor are combined as a unitary process.
  • This bioreactor may include a filtration and aeration device and at least two identically-equipped tanks having a common inlet with a valve that allows an influent flow to be switched between the tanks, similar to a sequential batch reactor.
  • the wastewater treatment system may include at least two identically-equipped tanks connected to a shared inlet, with a valve at the inlet that directs an influent flow to at least one of the tanks while the influent flow is shut off to at least another one of the tanks.
  • An aeration system oxygenates and mixes the wastewater in one or more, but not all, of the tanks at a time, while a decanting device draws off clean supernatant from the other tank or tanks. The clean supernatant is removed through a membrane module.
  • the wastewater treatment system also includes a system that passes a back- flow of air through the membrane module into at least one of the tanks at a time; this system may be all or part of the aeration system.
  • the membrane module may be a microfiltration device or an ultrafiltration device, with a 0.1 micron - 3.0 micron pore membrane.
  • Each of the tanks has a flow-through system that allows the influent flow into the tank at an inlet end and an effluent flow out of the tank elsewhere from the tank.
  • the tanks may each include a bio- selector near the inlet.
  • the wastewater treatment system may also include a mixer that mixes the wastewater without adding oxygen to the wastewater.
  • the mixer may be a mechanical mixer or a big bubble/low volume air mixing system.
  • a method of treating wastewater may include sending an influent of wastewater to an inlet connected to at least two identically-equipped tanks, wherein influent flow can be switched between the at least two tanks such that at least one of the tanks is in a decanting mode while at least another of the tanks is in an aerating mode.
  • the method may further include removing an effluent of treated wastewater from at least one of the tanks in the decanting mode through a membrane module, and passing a back-flow of air through the membrane module into at least one of the tanks in the aerating mode.
  • a tank may be filled with the influent while the tank is in the aerating or decanting mode.
  • the method may also include passing the influent through a bio- selector at an inlet of at least one of the tanks, wherein the bio-selector directs flow of the influent either from side to side of the tank or under and over consecutive baffles.
  • the influent may be passed through the tank with a mixer in which the wastewater is mixed without adding oxygen to the wastewater.
  • the influent may have a mixed liquor suspended solids (MLSS) concentration of between about 1500 and about 15,000 mg/1, or between about 2500 and about 5000 mg/1.
  • MMS mixed liquor suspended solids
  • the treated wastewater may have re-use quality comparable to MBR processes.
  • the treated wastewater may have an effluent quality of between about 0.1 and about 5 mg/1 BOD, between about 0.5 and about 5 mg/1 TSS, between about 0.01 and about 5 mg/1 phosphorus, and between about 0.1 and about 10 mg/1 nitrogen.
  • FIG. 1 is a diagram illustrating a wastewater treatment system.
  • FIG. 2 is a diagram illustrating the wastewater treatment system of FIG. 1 during one phase.
  • FIG. 3 is a diagram illustrating the wastewater treatment system of FIG. 1 during another phase.
  • FIG. 4 is a diagram illustrating another embodiment of a wastewater treatment system.
  • the invention is directed to a wastewater treatment system, namely a sequential batch membrane reactor, as well as methods of treating wastewater using a sequential batch membrane reactor.
  • a wastewater treatment system 20 may include two or more identically-equipped tanks 22a, 22b connected to a shared inlet 24, with a valve 26 at the inlet 24 that directs an influent flow 28 to one or more of the tanks 22b, while the influent flow 28 is shut off to another one or more of the tanks 22a.
  • the term "identically-equipped” refers to two or more tanks that are supplied with equipment to carry out the same processes in each tank, while the tanks themselves, and/or the equipment therein, may or may not be truly identical to one another. While two tanks 22a, 22b are illustrated in FIG.
  • any suitable number of tanks such as three, four, five, or more, may be included in the wastewater treatment system 20.
  • the configuration of the tanks 22a, 22b with the shared inlet 24 and the valve 26 is essentially the configuration of a sequential batch reactor.
  • Each of the tanks 22a, 22b suitably has a flow-through system that allows the influent flow 28 into the tank 22a, 22b at an inlet end and an effluent flow 30 out of the tank 22a, 22b elsewhere from the tank. While one of the tanks 22a is in a settle or decanting mode, the other tank 22b is aerating and filling.
  • the influent is raw wastewater and the effluent is treated water.
  • the tanks 22a, 22b may each include a bio-selector 31 near the inlet end of the tanks 22a, 22b.
  • the bio-selector 31 may include a series of walls or baffles that direct the influent flow 28 either from side to side of the tank 22a, 22b or under and over consecutive baffles. This configuration helps to mix the incoming influent and the activated sludge beginning the biological digestion process before the liquor enters the main part of the tank 22a, 22b.
  • An aeration system 38 driven by a compressor 39, oxygenates and mixes the wastewater in at least one of the tanks 22a, 22b at a time, while a decanting device 34 draws off clean supernatant from at least another one of the tanks 22a, 22b at a time.
  • a sludge removal device 32 may remove sludge from the tanks 22a, 22b during the decanting mode.
  • the clean supernatant 35 has a low solids concentration with high effluent quality, as discussed in greater detail below.
  • sludge may be removed at any time, not just during the decanting mode.
  • a membrane module 36 essentially the type used in a membrane bioreactor, is provided through which the clean supernatant is removed from at least one of the tanks 22a, 22b at a time.
  • the membrane module 36 may include a microfiltration device or an ultrafiltration device. More particularly, in certain embodiments, the membrane module 36 may have a pore membrane that is between about 0.1 micron and about 3.0 microns.
  • the membrane module 36 may be used as a decanting device 34, or the decanting device 34 may be a separate device.
  • the wastewater treatment system 20 also includes the aeration system 38, which passes a back-flow of air 40 through the membrane module 36 into at least one of the tanks 22a, 22b at a time.
  • the combination of the sequential batch reactor process and the membrane bioreactor equipment is a unitary process as used herein, in the sense that the equipment is used for both aeration and decanting, as opposed to spatially separated equipment used to carry out multiple processes separately.
  • the tanks 22a, 22b and the membrane module 36 may be located within the same housing 44.
  • the wastewater treatment system 20 may also include a mixer 42 located within each of the tanks 22a, 22b that mixes the wastewater without adding oxygen to the wastewater.
  • the mixer 42 may include a mechanical mixer.
  • the mixer 42 may include a big bubble/low volume air mixing system.
  • the wastewater treatment system 20 may further include a supplemental aeration system 46 located within each of the tanks 22a, 22b.
  • the supplemental aeration system 46 is optional. When present, the supplemental aeration system 46 may provide part or all of the required oxygen or air to the tanks 22a, 22b in combination with, or in lieu of, the back-flow of air 40 through the membrane module 36. When present, the supplemental aeration system 46 may also eliminate the need for the mixers 42.
  • a method of treating wastewater using the wastewater treatment system 20 shown in FIG. 1 may be carried out by sending an influent of wastewater to the inlet connected to the at least two identically-equipped tanks 22a, 22b.
  • the influent may be pumped into the tanks 22a, 22b, allowed to flow with the force of gravity, or otherwise sent to the tanks 22a, 22b.
  • the influent flow 28 can be switched between the tanks 22a, 22b such that at least one tank 22a is in a decanting mode while at least one other tank 22b is in an aerating mode.
  • the influent may fill any tanks 22a, 22b that are in the aerating or decanting mode.
  • FIG. 2 illustrates the wastewater treatment system 20 while one of the tanks 22a is in the decanting mode and the other tank 22b is in the aerating mode.
  • the influent may fill the tanks 22a, 22b during either the aerating or decanting mode.
  • the valve 26 is set to allow the influent to fill just the tank 22b that is in the aerating mode.
  • FIG. 3 illustrates the wastewater treatment system 20 while the tanks 22a, 22b are in the opposite modes shown in FIG. 2. More particularly, in FIG. 3 one of the tanks 22b is in the decanting mode and the other tank 22a is in the aerating mode.
  • the mixed liquor solids concentration may be similar to standard activated sludge, between about 1500 and about 15,000, or between about 2500 and about 5000 mg/1.
  • the influent may be passed through a bio-selector 31 at the inlet of each of the tanks 22a, 22b.
  • the bio-selector 31 directs flow of the influent either from side to side of the tank 22a, 22b or under and over consecutive baffles.
  • the influent may be passed through a mixer 42 in which the wastewater is mixed without adding oxygen to the wastewater.
  • the method may proceed by removing an effluent of treated wastewater from the at least one tank 22a in the decanting mode through the membrane module 36. After the effluent has been removed through the membrane module 36, a back-flow of air 40 is then passed through the membrane module 36 into the at least one tank 22b that is in the aerating mode.
  • the membrane module 36 is used both for decanting and aerating the wastewater.
  • Typical effluent quality of sequential batch reactors is 10 mg/1 BOD, 10 mg/1 TSS and phosphorus and nitrogen in single digits.
  • Typical effluent quality resulting from membrane bioreactors is 1 mg/1 BOD, 1 mg/1 total suspended solids (TSS) and fractional phosphorus and nitrogen.
  • the methods described herein may result in effluent quality of the clean supernatant similar to using membrane bioreactors, namely between about 0.1 and about 5 mg/1 BOD, between about 0.5 and about 5 mg/1 TSS, between about 0.01 and about 5 mg/1 phosphorus, and between about 0.1 and about 10 mg/1 nitrogen.
  • the wastewater treatment system 20 works essentially as described above in FIGS. 1-3, but with just one process tank 22a in the system 20, to function as a continuous-flow one-tank sequencing batch reactor. In this embodiment, multiple tanks may be used in parallel, just not in series as in the other embodiments described herein.
  • a flow equalization tank 50 may be used with this system 20.
  • the flow equalization tank 50 is filled with an influent of wastewater, and the flow equalization tank 50 releases the wastewater into the bioreactor or system 20 at a desired flowrate.
  • a flow equalization tank 50 may be used with any of the wastewater treatment system 20 embodiments described herein.
  • the valve 26 may be used to further control influent flow 28 to the tank 22a.
  • the tank 22a in FIG. 4 may switch modes between a decanting mode and an aerating mode.
  • the bio-selector 31 helps to mix the incoming influent and the activated sludge beginning the biological digestion process before the liquor enters the main part of the tank 22a.
  • the aeration system 38 oxygenates and mixes the wastewater in the tank 22a during the aerating mode, while the decanting device 34 draws off clean supernatant from the tank 22a during the decanting mode.
  • the sludge removal device 32 may remove sludge from the tank 22a during the decanting mode or at any time.
  • the membrane module 36 may be used as a decanting device 34, or the decanting device 34 may be a separate device.
  • the wastewater treatment system 20 also includes the aeration system 38, which passes a back-flow of air 40 through the membrane module 36 into the tank 22a.
  • the wastewater treatment system 20 may also include a mixer 42 located within the tank 22a that mixes the wastewater without adding oxygen to the wastewater.
  • the wastewater treatment system 20 may further include a supplemental aeration system 46 located within the tank 22a, which may provide part or all of the required oxygen or air to the tank 22a in combination with, or in lieu of, the back-flow of air 40 through the membrane module 36.
  • the supplemental aeration system 46 may also eliminate the need for the mixer 42.

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Activated Sludge Processes (AREA)

Abstract

La présente invention se rapporte à un système de traitement des eaux usées qui comprend au moins deux réservoirs équipés de manière identique et raccordés à un orifice d'entrée partagé, une vanne au niveau de l'orifice d'entrée qui dirige un écoulement entrant vers au moins l'un des réservoirs tandis que l'écoulement entrant est arrêté vers au moins l'autre réservoir, et un module à membrane au moyen duquel un surnageant propre est enlevé d'au moins l'un des réservoirs à un moment donné, le module à membrane servant de système d'aération qui oxygène et mélange à un moment donné les eaux usées dans au moins l'un des réservoirs, et un dispositif de décantation qui prélève à un moment donné le surnageant propre d'au moins l'un des réservoirs. Le système de traitement des eaux usées comprend également un système qui passe à un moment donné un flux inverse d'air à travers le module à membrane dans au moins l'un des réservoirs. Certains modes de réalisation peuvent comprendre un seul réservoir.
PCT/US2014/010147 2013-01-04 2014-01-03 Bioréacteur discontinu séquentiel à membrane WO2014107560A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361748824P 2013-01-04 2013-01-04
US61/748,824 2013-01-04

Publications (2)

Publication Number Publication Date
WO2014107560A2 true WO2014107560A2 (fr) 2014-07-10
WO2014107560A3 WO2014107560A3 (fr) 2014-10-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109110918A (zh) * 2018-09-18 2019-01-01 戚汝常 一种新型的sbr-mbr污水处理系统及工艺

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040206699A1 (en) * 2002-06-28 2004-10-21 Ho Kin Man Combined activated sludge-biofilm sequencing batch reactor and process
US6863817B2 (en) * 2002-12-05 2005-03-08 Zenon Environmental Inc. Membrane bioreactor, process and aerator
US7931808B2 (en) * 2006-08-23 2011-04-26 Siemens Water Technologies Corp. Sequencing batch reactor with continuous membrane filtration and solids reduction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040206699A1 (en) * 2002-06-28 2004-10-21 Ho Kin Man Combined activated sludge-biofilm sequencing batch reactor and process
US6863817B2 (en) * 2002-12-05 2005-03-08 Zenon Environmental Inc. Membrane bioreactor, process and aerator
US7931808B2 (en) * 2006-08-23 2011-04-26 Siemens Water Technologies Corp. Sequencing batch reactor with continuous membrane filtration and solids reduction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109110918A (zh) * 2018-09-18 2019-01-01 戚汝常 一种新型的sbr-mbr污水处理系统及工艺

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WO2014107560A3 (fr) 2014-10-23

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