CN101284698B - Method and device of jet airlift recirculated membrane bioreactor - Google Patents
Method and device of jet airlift recirculated membrane bioreactor Download PDFInfo
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- CN101284698B CN101284698B CN2008101107763A CN200810110776A CN101284698B CN 101284698 B CN101284698 B CN 101284698B CN 2008101107763 A CN2008101107763 A CN 2008101107763A CN 200810110776 A CN200810110776 A CN 200810110776A CN 101284698 B CN101284698 B CN 101284698B
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- 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
Abstract
The invention provides a method for manufacturing a jet gas-stripping type independent membrane bioreactor as well as a device for realizing the method. A jet aerator is adopted to replace the traditional blower for realizing the stripping effect of a membrane module, thereby greatly reducing the operational energy. Partial circulation solution in a bio-aeration pool flows through the jet aeratorat a high speed to generate the negative pressure for sucking air in, a fast mixed gas-liquid two-phase flow which is evenly ejected into the membrane module through a novel water and air distributing device is formed, continuous and effective washing and air bump rinse are carried out, the pollution of the membrane is effectively reduced and the service life of the membrane is prolonged. The violent agitation function produced by the jet aerator also increases the mass-transfer velocity in the mixed solution, so as to speed up the biochemical reaction and improve the treatment efficiency. The operational energy of the method is low, the pollution degree of the membrane is reduced, and the initial investment of the equipment is decreased. The structure of the device is simple, the occupied area is small, the operation is easy, and the automatic operation and the operation control are convenient.
Description
Technical field
The present invention relates to a kind of method of jet airlift recirculated membrane bioreactor and realize the device of this method, belong to wastewater treatment and reuse, and field of membrane bioreactor technology.
Background technology
Along with the fast development of modern industry, city size constantly enlarges, and water consumption continues to increase, and water resources is not enough day by day.For solving the problem of shortage of water resources, many countries have carried out the research of recycling sewage generated by making in succession.(MembraneBioreactor MBR) owing to the effluent quality good stable, is subjected to paying close attention to widely membrane bioreactor.MBR is a kind of new and effective sewage treatment process with membrane sepn and biologic treating technique combination, it is with the second pond in the membrane module replacement conventional activated sludge process, high efficiency separation effect by membrane module thoroughly separates muddy water, has advantages such as sludge concentration height, excess sludge production is few, effluent quality is good.The research of MBR starts from the sixties in 20th century, and through the development of decades, MBR has become the selection of a kind of very attractive and competitive power of municipal effluent and Industrial Wastewater Treatment and reuse aspect.
According to the position of membrane module, MBR is divided into separated type (claim not only external placed type) and two kinds of configurations of immersion (but also claiming built-in, integral type).Because good performance, it is convenient that cleaning operation, membrane module are changed, and separated type MBR particularly enjoys favor in the processing of trade effluent and the reuse at waste water.For controlling diaphragm pollutes, separated type MBR need produce the high speed cross-flow in membrane module, and operation energy consumption is higher, becomes the bottleneck that restriction separated type MBR applies.
Occur airlift recirculated MBR in recent years on the market, be known as third generation MBR.This system adopts the gas blower aeration, forms the gas-liquid two-phase cross-flow in membrane module, has reduced film and has polluted requirement and the operation energy consumption of control to the cross-flow flow velocity.But because gas-liquid mixed is even inadequately, local pollution appears in the membrane module of this system easily.And the gas blower aeration makes the system process complexity, controls loaded down with trivial detailsly, and operation energy consumption is still higher.In actual motion, also occur owing to misoperation easily, mixed solution pours in down a chimney the danger of gas blower.In order to overcome the above problems, the investigator has successively made big quantity research and has obtained certain progress both at home and abroad, but all there is certain weak point in these means, really effectively are still less in actual applications.Therefore, will be significant at these problem exploitation corresponding techniques to applying of MBR.
In the patent of the present invention, the applicant proposes a kind of jet airlift recirculated membrane bioreactor (Jet Airlift SideStreamMembrane Bioreactor, JA-SMBR), its outstanding feature is: adopt ejector to replace traditional blast aeration equipment, the high velocity liquid stream cutting air that utilizes circulation fluid in ejector, to produce, form high-speed gas-liquid two-phase turbulent flow, evenly spray in membrane module bottom, effectively controlled the local pollution of membrane module by the distribute water and air device.The present invention can effectively reduce the equipment operation energy consumption, reduces investment cost, and controlling diaphragm pollutes, and makes the MBR operation more stable, more efficient.
Summary of the invention
The object of the present invention is to provide a kind of method of jet airlift recirculated membrane bioreactor, this method adopts membrane biological reactor process, by ejector the membrane module unit realization gas of separate film biological reactor is proposed effect, put forward technology with traditional drum blower fan gas and compare, greatly reduce operation energy consumption and facility investment; Circulation fluid is the high speed flow mistake in ejector, produces negative pressure and sucks air, forms well-mixed biphase gas and liquid flow, and membrane module is carried out the air bump rinse operation of continuous effective, improves film surface cross-flow rate greatly, and effectively controlling diaphragm pollutes and takes place.Highly Wen Liu biphase gas and liquid flow evenly sprays the air water mixed solution by the distribute water and air device, has controlled the local pollution of membrane module, prolongs film work-ing life.The gas-liquid two-phase eddy current increases the dissolved oxygen amount in the sludge liquid again greatly, obviously improves biochemical reaction rate.The inlet mouth of ejector is provided with valve, and by time opening and close the suction of having controlled air, thereby the gas that can form a kind of pulse is put forward mode, has further reduced the film pollution.
Another object of the present invention is to provide a kind of jet airlift recirculated membrane bioreactor device, this device adopts ejector to replace traditional gas blower, realizes the gas of membrane module is proposed effect.Ejector acts on and suction air entrainmenting of air by water jet, mass exchange and momentum exchange by turbulent flow is blended in the water air again, this gas and liquid mixture has horizontal and vertical energy, effectively improve air water mixed solution Flow Field Distribution and turbulent situation, significantly improve rate of mass transfer, help mixed solution and form turbulent fluctuation preferably on the film surface and delay the formation that film pollutes greatly.Novel distribute water and air device is set behind the ejector, has improved the situation that traditional drum general mood is carried device gas-liquid skewness, the air water mixed solution evenly sprayed, the effectively controlling diaphragm generation of polluting.A direction of ejector enters, a direction air inlet.The inlet mouth of ejector is provided with valve, and by time opening and close the suction of having controlled air, thereby the gas that can form a kind of pulse is put forward mode, has further reduced the film pollution.
The present invention is realized by the following technical programs:
A kind of jet airlift recirculated membrane bioreactor device comprises biological cycle aeration tank, recycle pump, ejector, distribute water and air device, external membrane module, goes out water pump, backwashing pump and filtered water tank.It is characterized in that: water circulating pump imports coupled ejector with mud mixed liquid, design distribute water and air device behind the ejector, make gas-liquid mixed stream evenly be injected in the membrane module, membrane module see through liquid pipeline respectively with go out water pump and link to each other with backwashing pump, concentrated solution pipeline junctional membrane biological cycle aeration tank goes out the pumping line road, the backwashing pump suction culvert all links to each other with clean water basin.
The present invention also provides a kind of method of jet airlift recirculated membrane bioreactor, it is characterized in that comprising following process:
(1) the part mud mixed liquid in the biological cycle aeration tank is gone into ejector through recycle pump pressurization is laggard, and ejector internal recycle liquid flows and produces huge eddy current and entrainment air, forms the gas-liquid mixed stream of vigorous agitation, by the distribute water and air device;
(2) the distribute water and air device is evenly distributed in the membrane module gas-liquid mixed stream, the air that membrane module is carried out continuous effective washes away and cleans, flow through the concentrated solution that forms behind the membrane module and be back to the circulation of biological cycle aeration tank, membrane module sees through side and stores in suction pump suction water outlet inflow filtered water tank.
(3) inlet mouth of ejector is provided with valve, and by time opening and close the suction of having controlled air, thereby the gas that can form a kind of pulse is put forward mode, has further reduced the film pollution.
(4) regularly open backwashing pump, backwashing pump aspirates the water purification that is stored in the filtered water tank by self-suction function, and membrane module is carried out backwash.
The present invention compared with prior art has the following advantages and the high-lighting effect: adopt ejector to replace the traditional drum blower fan, realization membrane module gas is proposed effect, has reduced equipment operation energy consumption, investment cost and noise pollution; The high turbulent biphase gas and liquid flow that forms in the ejector has strengthened gas-liquid and has stirred degree, thereby improves film surface cross-flow rate, and effectively controlling diaphragm pollutes, and because the gas-liquid two-phase eddy current forms vigorous agitation, increase the dissolved oxygen amount in the mixed solution greatly, quicken biochemical reaction, improve processing efficiency; The distribute water and air device has improved the situation that traditional drum general mood is carried device gas-liquid skewness, and the air water mixed solution is evenly sprayed, and the effectively controlling diaphragm assembly localized membrane generation of polluting has prolonged film work-ing life.The inlet mouth of ejector is provided with valve, and by time opening and close the suction of having controlled air, thereby the gas that can form a kind of pulse is put forward mode, has further reduced the film pollution.Energy consumption of the present invention is low, and the film pollution level is light, and the facility investment expense is few, and apparatus structure is simple, and floor space is little, operation is succinct, be convenient to automatic operation control.
Description of drawings
Accompanying drawing is a process flow sheet of the present invention.
Among the figure: 1-biological cycle aeration tank, 2-recycle pump, 3-ejector, 4-blast main, 5-distribute water and air device, 6-membrane module, 7-suction pump, 8-backwashing pump, 9-filtered water tank, 10-valve.
Embodiment
Below in conjunction with accompanying drawing technological process of the present invention is further described.
As shown in the figure, part mud mixed liquid in the biological cycle aeration tank 1 enters in the ejector 3 through recycle pump 2, by entrainmenting of mud mixed liquid in the ejector 3, blending and cutting action, outside air is introduced in the ejector 3 by valve 10 and blast main 4, air and mud mixed liquid form the biphase gas and liquid flow of turbulence state in ejector 3, biphase gas and liquid flow enters in the membrane module 6 by distribute water and air device 5, membrane module 6 is washed away and air bump rinse operation, the dense water that generates through membrane module 6 backs returns biological cycle aeration tank 1, suction pump 7 suction water outlets are sent into filtered water tank 9 and are stored, backwashing pump 8 regularly from filtered water tank 9 suction clear water, carries out backwash to membrane module 6.
Below enumerate several examples effect of the present invention is described, but claim scope of the present invention is not limited only to this.
Embodiment 1: sanitary sewage disposal and middle water reuse project, treatment capacity is 600m
3/ d, former water COD
CrBe 200～500mg/L, BOD is 100～200mg/L, and SS is 150～200mg/L.After jet airlift recirculated MBR handles, water outlet COD
CrLess than 50mg/L, turbidity is less than 1NTU, and energy consumption is 0.85kWh/m
3This system's operation one month, transmembrane pressure (TMP) rises to 10kPa by 8kPa, and the mould difference rises steadily.
Embodiment 2: tobacco wastewater is handled and reuse project lab scale, and treatment capacity is 2000m
3/ d, former water COD
CrBe 500～2000mg/L, BOD is 150～400mg/L, and SS is 200～450mg/L.After jet airlift recirculated MBR handles, water outlet COD
CrLess than 50mg/L, turbidity is less than 1NTU, and MBR part energy consumption is 0.75kWh/m
3This system's operation one month, transmembrane pressure (TMP) rises to 12.6kPa by 8kPa, and the mould difference rises steadily, and is stable.
Claims (5)
1. a jet airlift recirculated membrane bioreactor device comprises biological cycle aeration tank, recycle pump, ejector, distribute water and air device, external membrane module, goes out water pump, backwashing pump and filtered water tank; It is characterized in that: water circulating pump imports coupled ejector with mud mixed liquid, but the valve that the inlet mouth pipeline of ejector is provided with time opening and closes, the gas that forms pulse is put forward mode, the distribute water and air device is installed on behind the ejector water inlet of membrane module low side on the pipeline, make gas-liquid mixed stream evenly be injected in the membrane module, membrane module see through liquid pipeline respectively with go out water pump and link to each other with backwashing pump, concentrated solution pipeline junctional membrane biological cycle aeration tank goes out the pumping line road, the backwashing pump suction culvert all links to each other with clean water basin.
2. a kind of jet airlift recirculated membrane bioreactor device according to claim 1, it is characterized in that: described ejector is mounted in the rear end of recycle pump.
3. the using method of an a kind of jet airlift recirculated membrane bioreactor device as claimed in claim 1 is characterized in that comprising following process:
(1) mud mixed liquid in the bio-aeration pool is gone into ejector through the recycle pump pressurization is laggard, and ejector internal recycle liquid flows and produces huge eddy current and entrainment air, forms the gas-liquid mixed stream of vigorous agitation, by the distribute water and air device;
(2) the distribute water and air device makes gas-liquid mixed stream be evenly distributed to the interior gas of realizing of membrane module and proposes effect, realization is carried out washing away of continuous effective and air bump rinse operation to membrane module, flow through the concentrated solution that forms behind the membrane module and be back to the bio-aeration pool circulation, membrane module sees through side and stores in suction pump suction water outlet inflow filtered water tank;
(3) inlet mouth of ejector is provided with valve, and by time opening and close the suction of having controlled air, thereby the gas that can form a kind of pulse is put forward mode, has further reduced the film pollution;
(4) regularly open backwashing pump, backwashing pump aspirates the water purification that is stored in the filtered water tank by self-suction function, and membrane module is carried out backwash.
4. the using method of a kind of jet airlift recirculated membrane bioreactor device according to claim 3 is characterized in that: described ejector is a direction water inlet, the air inlet of another one direction.
5. the using method of a kind of jet airlift recirculated membrane bioreactor device according to claim 3 is characterized in that: it is what to be used for realizing by making jointly of ejector and distribute water and air device that the gas of membrane module is proposed effect.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553450A (en) * | 2012-02-08 | 2012-07-11 | 广州市环境保护工程设计院有限公司 | Method for preventing split membrane bio-reactor (MBR) flat membrane pollution |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102234140A (en) * | 2010-04-29 | 2011-11-09 | 冯先凯 | Double-pump operated negative pressure fluid treatment equipment |
| CN102491454B (en) * | 2011-12-20 | 2014-02-05 | 大连理工大学 | Desized wastewater ultrafiltration pretreatment system based on jet aeration |
| EP4066926A1 (en) | 2014-10-22 | 2022-10-05 | Koch Separation Solutions, Inc. | Pulsed aeration system for submerged hollow fiber module |
| USD779632S1 (en) | 2015-08-10 | 2017-02-21 | Koch Membrane Systems, Inc. | Bundle body |
| CN108946936B (en) * | 2018-08-23 | 2024-02-02 | 怡灏环境技术有限公司 | UASB reactor with pulse water distribution |
| CN110734135A (en) * | 2019-11-25 | 2020-01-31 | 上海世渊环保科技有限公司 | anaerobic membrane bioreactors |
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| CN101139135A (en) * | 2007-09-04 | 2008-03-12 | 北京清大国华环保科技有限公司 | Shooting flow film-bioreactor method and device |
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| CN2366411Y (en) * | 1998-09-29 | 2000-03-01 | 国家环境保护局华南环境科学研究所 | Membrane-jet stream aeration pressure reactor |
| CN101139135A (en) * | 2007-09-04 | 2008-03-12 | 北京清大国华环保科技有限公司 | Shooting flow film-bioreactor method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102553450A (en) * | 2012-02-08 | 2012-07-11 | 广州市环境保护工程设计院有限公司 | Method for preventing split membrane bio-reactor (MBR) flat membrane pollution |
| CN102553450B (en) * | 2012-02-08 | 2013-06-19 | 广州市环境保护工程设计院有限公司 | Method for preventing split membrane bio-reactor (MBR) flat membrane pollution |
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Address after: 100085 C building, Ka Wah building, No. 9, 3rd Street, Beijing, Haidian District, C404 Patentee after: BEIJING GO HIGHER ENVIRONMENT CO., LTD. Address before: 100085 C building, Ka Wah building, No. 9, 3rd Street, Beijing, Haidian District, C404 Patentee before: Beijing Qingda Guohua Environmental Protection Technology Co., Ltd. |
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