CN106927560A - A kind of membrane aeration biomembrane reactor and its cleaning method - Google Patents
A kind of membrane aeration biomembrane reactor and its cleaning method Download PDFInfo
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- CN106927560A CN106927560A CN201511015820.9A CN201511015820A CN106927560A CN 106927560 A CN106927560 A CN 106927560A CN 201511015820 A CN201511015820 A CN 201511015820A CN 106927560 A CN106927560 A CN 106927560A
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- film
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- membrane aeration
- membrane
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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
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/102—Permeable membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/02—Forward flushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/162—Use of acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/164—Use of bases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/18—Use of gases
-
- 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 kind of membrane aeration biomembrane reactor and its cleaning method, the reactor includes：Putamina, film silk, the first end cap, the second end cap, water inlet, delivery port, air inlet and gas outlet；Film silk is installed in putamina, and two ends of putamina carry out end seal by the first end cap and the second end cap respectively；First end is covered and is provided with gas outlet, and the second end cap is provided with air inlet；On two film shell side walls of end, delivery port and water inlet are respectively equipped with；Water enters putamina by water inlet, and is discharged from delivery port in the way of overflow；Loading density of the film silk in putamina is 30%-70%.The membrane aeration biomembrane reactor that the present invention is provided uses modularized design, takes up an area and saves, it is easy to installation and debugging, and operation is simple, is capable of achieving fully automatic operation.
Description
Technical field
The invention belongs to water-treatment technology field, and in particular to a kind of membrane aeration biomembrane reactor and its cleaning method.
Background technology
Membrane aeration biomembrane reactor (MABR) is a kind of novel film-biological treatment group technology.In MABR
In, aeration film not only provides aeration but also also serves as the carrier of biofilm development.Oxygen in gas phase (aeration film inner chamber) is to pass through
The interface of film/biomembrane is diffused into biomembrane, and the substrate in liquid phase (waste water) is from biomembrane/liquid interface
Upper entrance biomembrane.The operation principle of aeration film is as shown in Figure 1.
Membrane aeration biomembrane reactor has following two distinguishing features：1st, the aeration mode of aeration film is bubble-free aeration,
Compared with having bubble aeration, oxygen utilization efficiency can be greatly improved, aeration power consumption is greatly reduced.2nd, aeration film surface
It is attached with biomembrane, and due to the presence of oxygen concentration gradients, biomembrane can be divided into aerobic layer, anoxic outside interior
Layer and anaerobic layer.Due to the presence of different type microorganism, traditional two ends formula anaerobism can be realized in single-reactor
The denitrification functions of/aerobic reactor.
In addition, membrane aeration biomembrane reactor has further the advantage that：1st, sludge yield is small, and this is biomembrane
The general advantage of method；2nd, due to using bubble-free aeration, it is suitable to process volatile organic compound, it is to avoid air pollution；3、
Efficiency of oxygen supply is high, is adapted to treatment high-concentration sewage；4th, hollow type aeration film specific surface area is big, biomass in reactor
Greatly, organic loading can be greatly improved.
By taking scheme disclosed in CN102531153 as an example (such as Fig. 2), traditional handicraft is more to be immersed in reactor by aeration film
Among, air or oxygen are provided by air pump, water inlet and water outlet are controlled with water pump is gone out by intake pump, by impeller
The modes such as stirring, magnetic agitation, air injection and hydraulic mixing realize the mixing of water.Above-mentioned traditional handicraft exists following
Shortcoming：
1st, traditional reactor is not standardized design typically, and is directed to reactor of the varying environment using customization,
The inside of reactor is provided with the film silk of predetermined amount.The reactor of this customization is of limited application, and, one
When denier water quality occurs larger fluctuation, disposal ability can not be adjusted flexibly, therefore longtime running effect is difficult to ensure that.
2nd, traditional reactor lacks effective aeration control membrane fouling means and effective cleaning way, film surface contamination
Oxygen transfer efficiency will be caused seriously to be reduced, and this is to limit the principal element that film is aerated membrane bioreactor.
3rd, film packed density is not enough in traditional reactor, and oxygen mass transfer is less efficient on the one hand causing waste water, another
Aspect biomass is low, causes to process load reduction.
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of membrane aeration biomembrane reactor.
It is a further object of the present invention to provide a kind of water treatment system using above-mentioned membrane aeration biomembrane reactor.
It is a further object of the present invention to provide the cleaning method of above-mentioned water treatment system.
It is a further object of the present invention to provide the membrane aeration biomembrane by above-mentioned membrane aeration biomembrane combination of reactors
Reaction unit.
It is yet another object of the invention to provide a kind of water treatment system using above-mentioned membrane aeration biomembrane reaction unit.
To reach above-mentioned purpose, the invention provides a kind of membrane aeration biomembrane reactor, the reactor includes：Putamina,
Film silk, the first end cap, the second end cap, water inlet, delivery port, air inlet and gas outlet；
Film silk is installed in putamina, and two ends of putamina carry out end seal by the first end cap and the second end cap respectively；
First end is covered and is provided with gas outlet, and the second end cap is provided with air inlet；
On two film shell side walls of end, delivery port and water inlet are respectively equipped with；Water enters film by water inlet
Shell, and discharged from delivery port in the way of overflow；
Loading density of the film silk in putamina is 30%-70%.
In above-mentioned membrane aeration biomembrane reactor, the loading density of film silk is especially set to 30%-70%, and
And intake method and overflow manner draining are employed, and make reactor that not only there is efficient disposal ability, and it is heavier
That wants is easy for cleaning.The membrane aeration biomembrane reactor that the present invention is provided, under conditions of above-mentioned loading density is met,
The balance in biofilm development space and component between actual microbial biomass between film silk is ensure that, makes reactor with higher
Ground organic loading；And, verified through actual motion, under the conditions of above-mentioned film silk loading density, the space institute between film silk
The water stream channel of formation is conducive to washing and cleaning operation, can play a part of effectively to control fouling membrane.
Above-mentioned membrane aeration biomembrane reactor could be arranged to circulation type membrane aeration and biological membrane reactor.
In above-mentioned membrane aeration biomembrane reactor, it is preferable that loading density of the film silk in putamina is 30-40%.
In above-mentioned membrane aeration biomembrane reactor, it is preferable that the delivery port is provided close to the putamina side of the first end cap
On wall, the water inlet is provided close on the film shell side wall of the second end cap.
In above-mentioned membrane aeration biomembrane reactor, it is preferable that the putamina is vertically arranged, and first end cap is
Upper end cover, second end cap is bottom end cover.
In above-mentioned membrane aeration biomembrane reactor, air inlet can use purity oxygen and air, according to actual waste water property
Determine.
In above-mentioned membrane aeration biomembrane reactor, the method for operation of reactor can be transported using single-stage or multi-level approach
OK；Can be by the way of single operation and circular flow for every one-level.Each method of operation is summarized as follows：
Single runs：Water inlet is by reaching requirement, whole directly water outlets after single treatment；
Circular flow：Part water outlet is recycled to intake pool, equivalent to extension process time；
Multistage operation：The water outlet of upper level assembly meets processing requirement as the water inlet of next level assembly using multistep treatment.
In above-mentioned membrane aeration biomembrane reactor, it is preferable that the film silk is made up of aeration film and biomembrane, described
Aeration film is strong using hydrophobicity, the big air-permeable, hydrophobic membrane of bubble point pressure, and the form of aeration film is hollow-fibre membrane.
In above-mentioned membrane aeration biomembrane reactor, it is preferable that the material of the film aeration film is polyethylene, polypropylene
Or polytetrafluoroethylene (PTFE).
In above-mentioned membrane aeration biomembrane reactor, it is preferable that be provided with water-locator in the water inlet.By setting
Water-locator, it is ensured that inlet distribution is uniform.
In above-mentioned membrane aeration biomembrane reactor, it is preferable that the reactor is provided with pressure sensor, for monitoring
The change of transmembrane pressure.When transmembrane pressure reaches certain limit, the cleaning procedure of reactor can be automatically turned on.
The present invention separately provides a kind of water treatment system using above-mentioned membrane aeration biomembrane reactor, and the system includes：
Membrane aeration biomembrane reactor, intake pump, air intake pump and intake pool；Air intake pump and membrane aeration biomembrane reactor
Air inlet connection；Intake pool is connected by intake pump with the water inlet of membrane aeration biomembrane reactor；Film aeration and biological
The delivery port of membrane reactor is connected with outlet conduit, and the branch road connected with intake pool is provided with outlet conduit.
Invention additionally provides the cleaning method of above-mentioned water treatment system, the cleaning method has following several, actual
The combination of one or more therein can be used during operation；
(1) liquid is just rinsed：Water (with larger flow) is injected by water inlet, to wash away the microorganism in film silk table face,
Liquid after cleaning is discharged by delivery port；
(2) liquid backwash：Water (with larger flow) is injected by discharge outlet, to wash away the pollution of film silk inside and outside
Thing, the liquid after cleaning is discharged by water inlet；In liquid backwash, film is flowed to by film silk inner side using clean water
Silk outside during, film silk hole in gather pollutant be flushed to film silk outside, make film silk internal-external can
It is flushed to；
(3) gas back-flushing：Gas (with larger flow) is passed through by exhaust outlet, to wash away the pollution inside film silk
Thing, the gas after cleaning is discharged by air inlet；
(4) soaking and washing：Cleaning fluid, immersion a period of time, by acid, alkali in cleaning fluid are passed through from exhaust outlet
Or oxidant removes the pollutant of membrane removal silk inside and outside, the liquid after cleaning is discharged by air inlet；In liquid immersion process,
Soak except can soak film silk inner surface pollutant, soak can also enter slowly permeable membrane silk go membrane removal silk in
The pollutant in portion, but liquid soak time is unsuitable long, and liquid otherwise used can kill useful microorganism.
The another membrane aeration biomembrane reaction unit there is provided by above-mentioned membrane aeration biomembrane combination of reactors of the invention,
The device is combined by 2 and above membrane aeration biomembrane reactor in mode in parallel or series.Can be according to sewage water
Matter and water unrestricted choice need to use the quantity of component.
Invention additionally provides a kind of water treatment system using above-mentioned membrane aeration biomembrane reaction unit, the system bag
Include：Membrane aeration biomembrane reaction unit, intake pump, air intake pump and intake pool；The membrane aeration biomembrane reaction unit
Including total water inlet, total delivery port, total air inlet, total gas outlet；Air intake pump and membrane aeration biomembrane reaction unit
Total air inlet connection；Intake pool is connected by intake pump with the total water inlet of membrane aeration biomembrane reaction unit；Film is aerated
Total delivery port of biomembrane reaction apparatus is connected with outlet conduit, and the branch connected with intake pool is provided with outlet conduit
Road.
The membrane aeration biomembrane reactor that the present invention is provided uses modularized design, takes up an area and saves, it is easy to installation and debugging,
Operation is simple, is capable of achieving fully automatic operation.
Brief description of the drawings
Fig. 1 is the operation principle schematic diagram of aeration film；
Fig. 2 is the artwork of membrane aeration biomembrane reactor in traditional handicraft；
Fig. 3 is the water treatment system in embodiment 1.
Specific embodiment
In order to be more clearly understood to technical characteristic of the invention, purpose and beneficial effect, now to skill of the invention
Art scheme carry out it is described further below, but it is not intended that to it is of the invention can practical range restriction.
Embodiment 1
A kind of membrane aeration biomembrane reactor is present embodiments provided, the reactor includes：Putamina, film silk, upper end cover,
Bottom end cover, water inlet, delivery port, air inlet and gas outlet；
Putamina is vertically arranged, and film silk is installed in putamina；The upper end cover of putamina is provided with gas outlet, is set on bottom end cover
There is air inlet；
Delivery port is provided with upper end cover in film shell side wall, film shell side wall is provided with water inlet at bottom end cover；
Water-locator is provided with water inlet, to water distribution uniformity；
Pressure sensor is provided with reactor；
Loading density of the film silk in putamina is 30%.
Above-mentioned membrane aeration biomembrane reactor is set to a kind of water treatment system (schematic diagram is as shown in Figure 3), this is
System includes：
Membrane aeration biomembrane reactor, intake pump, air intake pump and intake pool；
Air intake pump is connected with the air inlet of membrane aeration biomembrane reactor；
Intake pool is connected by intake pump with the water inlet of membrane aeration biomembrane reactor；
The delivery port of membrane aeration biomembrane reactor is connected with outlet conduit, is provided with outlet conduit and connected with intake pool
Logical branch road.
The cleaning method of above-mentioned water treatment system, there is following four：
(1) liquid is just rinsed：The water of big flow is injected by water inlet, to wash away the microorganism in film silk table face, clearly
Liquid after washing is discharged by delivery port；
(2) liquid backwash：The water of big flow is injected by discharge outlet, to wash away the pollutant of film silk inside and outside,
Liquid after cleaning is discharged by water inlet；
(3) gas back-flushing：The gas of big flow is passed through by exhaust outlet, to wash away the pollutant inside film silk,
Gas after cleaning is discharged by air inlet；
(4) soaking and washing：Cleaning fluid, immersion a period of time, by acid, alkali in cleaning fluid are passed through from exhaust outlet
Or oxidant removes the pollutant of membrane removal silk inside and outside, the liquid after cleaning is discharged by air inlet.
After tested, the water treatment system of the membrane aeration biomembrane reactor that the present embodiment is provided, with membrane aeration biomembrane work
Skill can reduce 50% compared to floor space, and operating cost saves more than 30%；Traditional membrane aeration biomembrane process operation 1
Aeration film is severe contamination within individual month or so, and the membrane aeration biomembrane reactor in the present embodiment can steadily in the long term run 6
More than individual month；Compared with membrane aeration biomembrane process, the organic loading of the membrane aeration biomembrane reactor in the present embodiment
2-3 times can be reached.
Claims (10)
1. a kind of membrane aeration biomembrane reactor, it is characterised in that the reactor includes：Putamina, film silk, first
End cap, the second end cap, water inlet, delivery port, air inlet and gas outlet；
Film silk is installed in putamina, and two ends of putamina carry out end seal by the first end cap and the second end cap respectively；
First end is covered and is provided with gas outlet, and the second end cap is provided with air inlet；
On two film shell side walls of end, delivery port and water inlet are respectively equipped with；Water enters film by water inlet
Shell, and discharged from delivery port in the way of overflow；
Loading density of the film silk in putamina is 30%-70%.
2. reactor according to claim 1, it is characterised in that loading density of the film silk in putamina be
30-40%.
3. reactor according to claim 1, it is characterised in that the delivery port is provided close to the first end cap
Film shell side wall on, the water inlet is provided close on the film shell side wall of the second end cap.
4. reactor according to claim 1 and 2, it is characterised in that the putamina is vertically arranged, institute
The first end cap is stated for upper end cover, second end cap is bottom end cover.
5. reactor according to claim 1, it is characterised in that be provided with water-locator in the water inlet；
Pressure sensor is provided with the reactor, the change for monitoring transmembrane pressure.
6. reactor according to claim 1, it is characterised in that the film silk is by aeration film and biomembrane group
Into the aeration film is strong using hydrophobicity, the big air-permeable, hydrophobic membrane of bubble point pressure, and the form of aeration film is doughnut
Film；
Preferably, the material of the aeration film is polyethylene, polypropylene or polytetrafluoroethylene (PTFE).
7. a kind of usage right requires the water treatment system of the membrane aeration biomembrane reactor described in 1-6 any one,
The system includes：
Membrane aeration biomembrane reactor, intake pump, air intake pump and intake pool；
Air intake pump is connected with the air inlet of membrane aeration biomembrane reactor；
Intake pool is connected by intake pump with the water inlet of membrane aeration biomembrane reactor；
The delivery port of membrane aeration biomembrane reactor is connected with outlet conduit, is provided with outlet conduit and connected with intake pool
Logical branch road.
8. the cleaning method of the water treatment system described in claim 7, wherein, the cleaning method includes following several
The combination of one or more in kind：
Liquid is just rinsed：Water is injected by water inlet, to wash away the microorganism in film silk table face, the liquid after cleaning is by going out
Discharge at the mouth of a river；
Liquid backwash：Water is injected by discharge outlet, to wash away the pollutant of film silk inside and outside, liquid after cleaning by
Water inlet is discharged；
Gas back-flushing：Gas is passed through by exhaust outlet, to wash away the pollutant inside film silk, gas after cleaning by
Air inlet is discharged；
Soaking and washing：Cleaning fluid, immersion a period of time, by the acid in cleaning fluid, alkali or oxygen are passed through from exhaust outlet
Agent removes the pollutant of membrane removal silk inside and outside, and the liquid after cleaning is discharged by air inlet.
9. the film aeration life of the membrane aeration biomembrane combination of reactors described in a kind of claim 1-6 any one
Thing film reaction device, the device is by 2 and above membrane aeration biomembrane reactor so that mode in parallel or series is combined
Into.
10. a kind of usage right requires the water treatment system of the membrane aeration biomembrane reaction unit described in 9, the system bag
Include：
Membrane aeration biomembrane reaction unit, intake pump, air intake pump and intake pool；
The membrane aeration biomembrane reaction unit includes total water inlet, total delivery port, total air inlet, total gas outlet；
Air intake pump is connected with total air inlet of membrane aeration biomembrane reaction unit；
Intake pool is connected by intake pump with the total water inlet of membrane aeration biomembrane reaction unit；
Total delivery port of membrane aeration biomembrane reaction unit is connected with outlet conduit, is provided with outlet conduit and water inlet
The branch road of pond connection.
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| CN201511015820.9A CN106927560A (en) | 2015-12-29 | 2015-12-29 | A kind of membrane aeration biomembrane reactor and its cleaning method |
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| CN201511015820.9A CN106927560A (en) | 2015-12-29 | 2015-12-29 | A kind of membrane aeration biomembrane reactor and its cleaning method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108483626A (en) * | 2018-05-31 | 2018-09-04 | 广州惟环保科技有限公司 | A kind of bubble-free aeration device of cloth-bag type spiral wound combination |
| CN109179888A (en) * | 2018-09-30 | 2019-01-11 | 浙江工商大学 | The wastewater treatment equipment and technique of integrated ozone coupling membrane bioreactor |
| CN110479115A (en) * | 2019-05-30 | 2019-11-22 | 江苏滤盾膜科技有限公司 | A kind of MABR doughnut membrane preparation method |
| CN110510732A (en) * | 2019-07-31 | 2019-11-29 | 中国航天员科研训练中心 | A kind of composite membrane-type biological reaction apparatus |
| WO2022096608A1 (en) * | 2020-11-05 | 2022-05-12 | Fresenius Medical Care Deutschland Gmbh | Method for providing a sample concentrate, and set for carrying out said method |
| US11459252B2 (en) | 2018-02-15 | 2022-10-04 | Kurita Water Industries Ltd. | Aerobic biological treatment apparatus |
| WO2023199664A1 (en) * | 2022-04-15 | 2023-10-19 | メタウォーター株式会社 | Method for cleaning organic waste water treatment apparatus |
| CN117228860A (en) * | 2023-11-16 | 2023-12-15 | 成都凯亚美环保机械制造股份有限公司 | MABR membrane assembly, membrane structure and sewage treatment system using same |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11459252B2 (en) | 2018-02-15 | 2022-10-04 | Kurita Water Industries Ltd. | Aerobic biological treatment apparatus |
| CN108483626A (en) * | 2018-05-31 | 2018-09-04 | 广州惟环保科技有限公司 | A kind of bubble-free aeration device of cloth-bag type spiral wound combination |
| CN109179888A (en) * | 2018-09-30 | 2019-01-11 | 浙江工商大学 | The wastewater treatment equipment and technique of integrated ozone coupling membrane bioreactor |
| CN109179888B (en) * | 2018-09-30 | 2021-10-22 | 浙江工商大学 | Wastewater treatment device and process of integrated ozone coupling membrane bioreactor |
| CN110479115A (en) * | 2019-05-30 | 2019-11-22 | 江苏滤盾膜科技有限公司 | A kind of MABR doughnut membrane preparation method |
| CN110510732A (en) * | 2019-07-31 | 2019-11-29 | 中国航天员科研训练中心 | A kind of composite membrane-type biological reaction apparatus |
| CN110510732B (en) * | 2019-07-31 | 2023-03-21 | 中国航天员科研训练中心 | Composite membrane type biological reaction device |
| WO2022096608A1 (en) * | 2020-11-05 | 2022-05-12 | Fresenius Medical Care Deutschland Gmbh | Method for providing a sample concentrate, and set for carrying out said method |
| WO2023199664A1 (en) * | 2022-04-15 | 2023-10-19 | メタウォーター株式会社 | Method for cleaning organic waste water treatment apparatus |
| CN117228860A (en) * | 2023-11-16 | 2023-12-15 | 成都凯亚美环保机械制造股份有限公司 | MABR membrane assembly, membrane structure and sewage treatment system using same |
| CN117228860B (en) * | 2023-11-16 | 2024-01-23 | 成都凯亚美环保机械制造股份有限公司 | MABR membrane assembly, membrane structure and sewage treatment system using same |
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