CN108483578A - A kind of sewage processing filtering device - Google Patents
A kind of sewage processing filtering device Download PDFInfo
- Publication number
- CN108483578A CN108483578A CN201810399505.8A CN201810399505A CN108483578A CN 108483578 A CN108483578 A CN 108483578A CN 201810399505 A CN201810399505 A CN 201810399505A CN 108483578 A CN108483578 A CN 108483578A
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- China
- Prior art keywords
- filtering device
- air inlet
- sewage processing
- processing filtering
- air pocket
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Classifications
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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
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
A kind of sewage processing filtering device of the present invention discloses a kind of ultra-filtration membrane device with air pocket generator, should include filter shell and the ultrafiltration membrane mounting structure in filter shell：Air pocket generating means is set in the filter shell, and the volume for the bubble that the air pocket generating means generates is 2.5 5.0L, and the air pocket is for cleaning filter assemblies.The present invention is as a result of air pocket generating means, when being contacted with film wire, bubble is burst the air pocket of its high speed and high pressure generated, during bursting, the surface tension of bubble rapidly pulls away the pollutant of fenestra, and pollutant then follows the bubble after bursting and cross-flow water that putamina is discharged together.Film wire after air pocket cleans can restore original flux, solve the problems, such as that film wire needs backwash medicine to steep.
Description
Technical field
The invention belongs to workpiece water treatment fields, and in particular to a kind of effluent treatment and filtering with air pocket generating means
Device.
Background technology
With the increase of market of sewage treatment, membrane technology type is also more and more, and ultrafiltration membrane, tubular membrane, ceramic membrane all belong to
In wherein.Since ultrafiltration membrane cost is relatively low and membrane area is relatively large, ultrafiltration membrane enjoys great popularity in market.So
And ultrafiltration membrane is since the material of film is more fragile, in practical applications, when film occurs dirty stifled, backwash dynamics cannot be too big, backwash
Dynamics is excessive, be easy to cause film wire fracture, backwash dynamics is small, and backwash effect is not then highly desirable, it is difficult to restore flux, it can only be by passing
Medicine of uniting steeps mode, and medicine bubble then increases operating cost.
Described in aeration structure Fig. 1 that traditional ultrafiltration Membrane cleaning uses, aeration plate is installed in ultrafiltration bottom, is passed through high pressure gas
Body, high pressure gas generate rapidly minute bubbles by aeration plate aperture, minute bubbles since the high pressure gas of spontaneous packing is small, with
When film wire contacts, bubble bursts that dynamics is small, can only clean the pollutant on film wire surface, can not the points of contamination in film wire hole is clear
It washes thoroughly, film wire slowly deepens film dirt and block up situation, film Severe blockage, flux is caused to decline with the passage of application time.This at
Be a kind of common fault that industry uses ultrafiltration membrane, develop a kind of efficient ultrafiltration membrane cleaning technique be industry there is an urgent need to.Tradition
The cleaning of tubular membrane, ceramic membrane all there is the above problem.
Invention content
To solve the above-mentioned problems, the purpose of the present invention is to provide a kind of sewage processing filtering device, cleaning effects
Well, cleaning cost is low.
To achieve the above object, the present invention is achieved by following technical scheme：
A kind of sewage processing filtering device, including filter shell and the filter assemblies mounting structure in filter shell,
It is characterized in that：The air pocket generating means of bubble for cleaning filter assemblies, the air are set in the filter shell
The volume for the bubble that the generating apparatus that is soaked generates is 2.5-5.0L.
Preferably, the filter assemblies in the sewage processing filtering device are located at air pocket generating means generation
On the movement locus of bubble and for the first barrier of bubbles burst can be promoted during bubble motion.
Preferably, the air pocket generating means includes：Outer housing with cavity and the air inlet being connected to cavity
Mouth and gas outlet are discharged from the gas outlet after the gas that the air inlet inputs is via U-shaped path and form the air
Bubble；The air inlet is connected to gas source.
Preferably, the outer housing of air pocket generating means includes pedestal and main body, pedestal is all connected by screw thread with main body
It connects in filtrate housing；The pedestal, main body and local filtration shell besieged city cavity.
Preferably, the air pocket generating means further includes snorkel, the snorkel is connected with the air inlet,
The gas of the air inlet input enters the U-shaped path via the snorkel.
As preferred：The air pocket generating means further includes escape pipe and the transition cylinder with open at one end；It is described
Escape pipe one end is placed in the transitional cylinder body, the other end of the escape pipe formed escape pipe described in the gas outlet with it is described
The cavity in gap and the escape pipe between transition cylinder forms the U-shaped path；Cylinder is crossed described in the gas warp
Opening after, into the U-shaped path, excluded from the gas outlet behind the U-shaped path and form the air pocket.
As preferred：The air inlet is formed by the open end of air inlet pipe；The air inlet pipe upper end is a cecum, described blind
End is tightly connected the lower end of the transition cylinder, is provided with venthole on the side wall of the air inlet pipe of the cecum, institute
It states snorkel to be connected to the venthole, the lower port of the escape pipe is located at the middle and lower part of the cylinder.
As preferred：The air inlet is formed by the open at one end of air inlet pipe, and the open at one end of the air inlet pipe is close
The lower end of envelope one cylinder of connection, the lower end of the transition cylinder are provided with sealing partition board, and the air inlet is located in the partition board
Described the lower partition, is provided with venthole on the side wall of the air inlet pipe of the partition board, and the snorkel leads to described
Stomata is connected to, and the lower port of institute's escape pipe is located at the middle and lower part of the cylinder.
A kind of sewage processing filtering device according to claim 3, it is characterised in that：Institute's outer housing is equipped with draining
Mouthful.
As preferred：Multiple filter assemblies are installed on the filter assemblies mounting structure.
As preferred：The interior diameter of the transition cylinder is 170mm-100mm, and the interior diameter of the escape pipe is 50mm-
20mm。
As preferred：The interior diameter of the interior diameter 175mm of the transition cylinder, the escape pipe are 25mm.
As preferred：The gas pressure intensity that the gas source is output to the air inlet is 0.045mpa-0.06mpa.
As preferred：The filter assemblies are ceramic membrane or ultrafiltration membrane or tubular membrane.
Compared with prior art, the beneficial effects of the invention are as follows：
In sewage processing filtering device of the present invention, due to using air pocket generating means, the high speed generated is high
When being contacted with filter assemblies (membrane structure), bubble is burst the air pocket of pressure, during bursting, the surface tension of bubble handle rapidly
The pollutant of fenestra pulls away, and pollutant then follows the bubble after bursting and cross-flow water to be discharged together.After air pocket cleans
Filter assemblies can restore original flux, solve the problems, such as that film wire needs backwash medicine to steep.
Description of the drawings
Specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is traditional ultra-filtration membrane device；
Fig. 2 is sewage processing filtering device of the present invention (filter assemblies are ultrafiltration membrane)；
Fig. 3 is air pocket generating means of the present invention.
Fig. 4 A are the sewage processing filtering devices of the present invention when not being aerated；
Sewage processing filtering device when Fig. 4 B are aerations of the present invention；
Fig. 5 is sewage processing filtering device of the present invention (filter assemblies are frame ceramic membrane)；
Fig. 6 is sewage processing filtering device of the present invention (filter assemblies are tubular ceramic membrane).
Wherein：
1-effluent treatment and filtering；11-filter shells；12-ultrafiltration membrane film wires；13-exhaust passages；14-drainings are logical
Road；
2-air pocket generating means；21-outer housings；22-transition cylinders；23-escape pipes；24-snorkels；25—
Air inlet pipe.
3-tubular membranes；4-ceramic membranes.
Specific implementation mode
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
It is in sewage processing filtering device of the present invention as Figure 2-3, filter assemblies are the embodiment of ultrafiltration membrane.
Sewage processing filtering device includes filter shell and the filter assemblies mounting structure in filter shell, filtering group
Ultrafiltration membrane film wire group is installed on part mounting structure.The air of bubble of the setting for generating cleaning filter assemblies in filter shell
Be soaked generating apparatus, and the volume for the bubble that air pocket generating means generates is 2.5-5.0L.Filtrate housing is equipped with drainage channel, closely
Filter assemblies mounting structure one end is additionally provided with the exhaust passage of the gas for excluding to be formed after air follicular rupture.
Air pocket generating means includes：Outer housing and the air inlet being connected to cavity with cavity and gas outlet, outside
Shell is equipped with the discharge outlet being connected to cavity.The opening of gas outlet towards ultrafiltration membrane film wire group in sewage processing filtering device,
After the gas of air inlet input is via U-shaped path, it is discharged from gas outlet and forms air pocket.Air inlet is connected to gas source, gas
The gas pressure intensity that body source is output to the air inlet is 0.045mpa-0.06mpa.As described in Fig. 2 and Fig. 3, air pocket fills
The outer housing set includes pedestal and main body, and pedestal is all connected through a screw thread in filtrate housing with main body；As seen from Figure 3,
Pedestal, main body and local filtration shell besieged city cavity.
Air pocket generating means further includes snorkel, and snorkel is connected with air inlet, air inlet input gas via
Snorkel enters U-shaped path.
Air pocket generating means further includes that escape pipe and the transition cylinder with open at one end, escape pipe one end are placed in transition
In cylinder, the other end of escape pipe forms the gas outlet, the sky in gap and escape pipe between escape pipe and transition cylinder
Chamber forms U-shaped path；Gas enters U-shaped path after entering the opening of transition cylinder via snorkel, behind U-shaped path from
Gas outlet excludes and forms air pocket.
Air inlet is formed by the open end of air inlet pipe；Air inlet pipe upper end is a cecum, and cecum is tightly connected transition cylinder
Lower end is provided with venthole on the side wall of the air inlet pipe of cecum, and snorkel is connected to venthole, the lower port of institute's escape pipe
Positioned at the middle and lower part of cylinder.
Air inlet is formed by the open at one end of air inlet pipe, and the open at one end of air inlet pipe is tightly connected under a cylinder
End, the lower end of transition cylinder are provided with sealing partition board, and air inlet is located at described the lower partition in partition board, close to the air inlet pipe of partition board
Side wall on be provided with venthole, snorkel is connected to venthole, and the lower port of escape pipe is located at the middle and lower part of the cylinder.
Outer housing is equipped with discharge outlet, and multiple ultrafiltration membrane film wire groups are equipped on ultrafiltration membrane mounting structure.
The interior diameter of transition cylinder is 170mm-100mm, and the interior diameter of escape pipe is 50mm-20mm.Preferably, transitional cylinder
The interior diameter of the interior diameter 175mm of body, escape pipe are 25mm.
The gas pressure intensity that gas source is output to air inlet is 0.045mpa-0.06mpa.According to sewage quality in practical practicality
Determine gas pressure intensity, it is when being less than 500mg/L less than 100mg/L and ss of the low cod of sewage, dirty using 0.045mpa compressed gas
When being higher than 500mg/L higher than 100mg/L and ss of the cod of water, using higher than 0.045mpa compressed gas, concrete application regards sewage
Water quality determines.Compressed gas is stronger, and bubble generation is more frequent, more to the wash number of film.
Sewage processing filtering device of the invention shown in Fig. 2-3 is directed to clear in the upper installation of sewage processing filtering device
Wash the air pocket generating means of workpiece mounting structure.Go out to access compressed gas in the air inlet of air pocket generating means, compressed gas
Pressure is arranged in body, is higher than exhaust gas pipe height pressure difference, and therefore, compressed gas then enters air pocket generating means, and slow using pressure difference
Slowly the water of air generator is forced out air pocket generating means, the entire air pocket generating means made is full of compressed gas, pressure
Contracting gas U-shaped trend inside air pocket generating means.When compressed gas reaches air pocket generating means top, compression
Gas is gone successively to, at this point, the compressed gas full of cavity is then moved downward by being aerated extra heavy pipe, when the compressed gas moved downward
When body reaches the peak of escape pipe, external pressure continues, and the disjunctor compressed gas having one's bosom filled at this time then has some bubbles to pass through peak.
By the bubble of peak under the action of external pressure gentle body surface tension, the disjunctor bubble having one's bosom filled with is pulled out together rapidly, wink
Between in escape pipe form big hyperbaric atmosphere bubble, gas is discharged rapidly upward, and the air pocket of high speed and high pressure with film wire when contacting, gas
Bubble is burst, and during bursting, the surface tension of bubble rapidly pulls away the pollutant of fenestra, and pollutant then follows the gas after bursting
Filter shell is discharged in bubble and cross-flow water together.Film wire after air pocket cleans can restore original flux, and solving film wire needs
The problem of backwash medicine bubble.
In sewage processing filtering device cleaning process using the present invention, shown in Fig. 4 B, the air pocket of high speed and high pressure rushes
Stream of striking waters causes water hammer effect, water hammer effect to play the role of water backwash film wire inside filter shell.Shown in Fig. 4 A, air pocket
The bubble that transmitting apparatus generates has certain volume, is not aerated at this time, the water level in filter device is at M.As air is soaked dress
The bubble volume for setting generation becomes larger to a certain extent, and air pocket is aerated moment, and the gas shape bubble in the generation of air bulb apparatus squeezes
Go out air pocket transmitting apparatus, bubble moves rapidly upward, as shown in Figure 4 B.Since bubble volume is big, instantaneous burst impact is filtered outer
Water level in shell is increased due to increasing bubble volume.The sectional area of exhaust pipe (exhaust pipe can also drain) is small, can not be in gas
Body instantaneous burst drains flow when impact, is to have certain pressure inside filter shell so when aeration, filter shell
Gas at interior high pressure can move towards at some low pressure.Since gas can not walk endless, and its leeway from exhaust pipe completely
Side is sealing, therefore, can only be walked by the endoporus of the film wire of ultrafiltration membrane.When gas walks film wire endoporus, film wire hole need to be first passed through,
In strong current, under hydraulic pressure impact, gas extrusion passes through film wire hole, is then importing film wire endoporus, film wire hole by flow and
Hydraulic pressure impacts, and when extruding, forms water backwash effect to film wire.Since, aeration is that interval time is lasting, so
When equipment is run, all the time all in backwash film wire, ensure that flux and film are not dirty stifled.
In the present invention, the filter assemblies are ultrafiltration membrane as shown in Figure 2, or are ceramic membrane, specific ceramic membrane
Can to be frame ceramic membrane as shown in Figure 5, tubular ceramic membrane shown in fig. 6.
Specifically, it is carried out at sewage in sewage processing filtering device using the present invention and traditional sewage-treatment plant
Reason, i.e. progress air pocket generating means carry out cleaning to ultrafiltration membrane to ultrafiltration Membrane cleaning and traditional aeration bubbles and carry out to having a competition
It tests, test result is as shown in table 1, table 2, table 3：
The big air bubble of ultrafiltration of 1. present invention of table and traditional ultrafiltration air bubble processing anaerobism sewage compare for 60 days:
The big air bubble of ultrafiltration of 2. present invention of table and the processing anaerobism sewage of traditional ultrafiltration air bubble compare for 120 days:
The big air bubble of ultrafiltration of 3. present invention of table and anaerobism sewage disposal and the black sewage to draw water of traditional ultrafiltration air bubble
Processing control:
As shown in Table 1, when foster sewage 60 days is detested in sewage processing filtering device processing of the invention, hardly staining metal in film wire,
Flux stabilized, the i.e. present invention can be with long period treated sewages.
As shown in Table 2, after sewage processing filtering device of the invention handles anaerobism sewage disposal 120 days, in bubble volume
For 2.5L, when 3L, 5L, there is preferable membrane flux, that is to say, that it can also continue to be employed without cleaning after 120 days, and it is traditional
Bubble processing unit, using drainage cannot be continued substantially after 120 days, that is to say, that its membrane flux is substantially zeroed.
As shown in Table 3, sewage processing filtering device of the invention to bubble anaerobism sewage disposal 120 days and is steeping black smelly water
Body application processing still has preferable membrane flux after 40 days, and the filter membrane of traditional filtering device cleaning way is then substantially obstructed
Water, that is to say, that sewage processing filtering device of the present invention anaerobism utilization of polluted brine and it is black draw water in can long-time can hold
It is continuous to use.
The filter assemblies of sewage processing filtering device of the present invention can also be tubular membrane or ceramic membrane, two kinds of film knots
Structure carries out above-mentioned experiment, two kinds of membrane structure filterings of air pocket generating means pair in sewage processing filtering device of the present invention
The cleaning performance of component is very good, keeps the ability of sewage processing filtering device treated sewage of the present invention fine, sustainable
It uses.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, therefore
It is every without departing from technical solution of the present invention content, according to the technical essence of the invention to made by above example it is any modification,
Equivalent variations and modification, in the range of still falling within technical solution of the present invention.
Claims (14)
1. a kind of sewage processing filtering device, including filter shell and the filter assemblies mounting structure in filter shell,
It is characterized in that：The air pocket generating means of bubble for cleaning filter assemblies, the air pocket are set in the filter shell
The volume for the bubble that generating means generates is 2.5-5.0L.
2. a kind of sewage processing filtering device according to claim 1, which is characterized in that the sewage processing filtering device
Interior filter assemblies are located on the movement locus of the bubble of air pocket generating means generation and in the process can for bubble motion
Promote the first barrier of bubbles burst.
3. a kind of sewage processing filtering device according to claim 1, which is characterized in that the air pocket generating means packet
It includes：Outer housing and the air inlet being connected to cavity with cavity and gas outlet, the gas of the air inlet input is via U-shaped
Behind path, it is discharged from the gas outlet and forms the air pocket；The air inlet is connected to gas source.
4. a kind of sewage processing filtering device according to claim 3, which is characterized in that the shell of air pocket generating means
Body includes pedestal and main body, and pedestal is all connected through a screw thread in filtrate housing with main body；The pedestal, main body and part
Filtrate housing besieged city cavity.
5. a kind of sewage processing filtering device according to claim 3, which is characterized in that the air pocket generating means is also
Including snorkel, the snorkel is connected with the air inlet, the gas of air inlet input via the snorkel into
Enter the U-shaped path.
6. a kind of sewage processing filtering device according to claim 5, it is characterised in that：The air pocket generating means is also
Transition cylinder including escape pipe and with open at one end；Described escape pipe one end is placed in the transitional cylinder body, the outlet
The other end of pipe forms the sky in the gap and the escape pipe between escape pipe described in the gas outlet and the transition cylinder
Chamber forms the U-shaped path；After the gas crosses the opening of cylinder described in, into the U-shaped path, by described U-shaped
It is excluded from the gas outlet behind path and forms the air pocket.
7. a kind of sewage processing filtering device according to claim 6, it is characterised in that：The air inlet is by air inlet pipe
Open end is formed；The air inlet pipe upper end is a cecum, and the cecum is tightly connected the lower end of the transition cylinder, close to described
Venthole is provided on the side wall of the air inlet pipe of cecum, the snorkel is connected to the venthole, the escape pipe
Lower port is located at the middle and lower part of the cylinder.
8. a kind of sewage processing filtering device according to claim 6, it is characterised in that：The air inlet is by air inlet pipe
Open at one end is formed, and the open at one end of the air inlet pipe is tightly connected the lower end of a cylinder, the lower end of the transition cylinder
It is provided with sealing partition board, the air inlet is located at described the lower partition in the partition board, close to the air inlet pipe of the partition board
Side wall on be provided with venthole, the snorkel is connected to the venthole, and the lower port of institute's escape pipe is located at the cylinder
Middle and lower part.
9. a kind of sewage processing filtering device according to claim 3, it is characterised in that：Institute's outer housing is equipped with draining
Mouthful.
10. a kind of sewage processing filtering device according to claim 1, it is characterised in that：The filter assemblies installation knot
Multiple filter assemblies are installed on structure.
11. according to a kind of sewage processing filtering device of claim 5-7 any one of them, it is characterised in that：The transitional cylinder
The interior diameter of body is 170mm-100mm, and the interior diameter of the escape pipe is 50mm-20mm.
12. a kind of sewage processing filtering device according to claim 11, it is characterised in that：The transition cylinder it is interior straight
The interior diameter of diameter 175mm, the escape pipe are 25mm.
13. according to a kind of sewage processing filtering device of claim 3-9 any one of them, it is characterised in that：The gas source
The gas pressure intensity for being output to the air inlet is 0.045mpa-0.06mpa.
14. a kind of sewage processing filtering device according to claim 1, it is characterised in that：The filter assemblies are ceramics
Film or ultrafiltration membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810399505.8A CN108483578A (en) | 2018-04-28 | 2018-04-28 | A kind of sewage processing filtering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810399505.8A CN108483578A (en) | 2018-04-28 | 2018-04-28 | A kind of sewage processing filtering device |
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| Publication Number | Publication Date |
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| CN108483578A true CN108483578A (en) | 2018-09-04 |
Family
ID=63313436
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810399505.8A Pending CN108483578A (en) | 2018-04-28 | 2018-04-28 | A kind of sewage processing filtering device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109694133A (en) * | 2019-02-28 | 2019-04-30 | 广州市世来至福科技有限公司 | Wastewater treatment method and its cross flow membrane bioreactor ultrafiltration system of use |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102658031A (en) * | 2012-04-28 | 2012-09-12 | 湖州斯科能新材料有限公司 | External filtering system for hollow fiber porous membrane bundle and technology thereof |
| CN107185409A (en) * | 2017-05-11 | 2017-09-22 | 北京大井易通科技发展有限公司 | New center is aerated immersion type membrane component |
| CN208869360U (en) * | 2018-04-28 | 2019-05-17 | 广州市世来至福科技有限公司 | A kind of sewage processing filtering device |
-
2018
- 2018-04-28 CN CN201810399505.8A patent/CN108483578A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102658031A (en) * | 2012-04-28 | 2012-09-12 | 湖州斯科能新材料有限公司 | External filtering system for hollow fiber porous membrane bundle and technology thereof |
| CN107185409A (en) * | 2017-05-11 | 2017-09-22 | 北京大井易通科技发展有限公司 | New center is aerated immersion type membrane component |
| CN208869360U (en) * | 2018-04-28 | 2019-05-17 | 广州市世来至福科技有限公司 | A kind of sewage processing filtering device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109694133A (en) * | 2019-02-28 | 2019-04-30 | 广州市世来至福科技有限公司 | Wastewater treatment method and its cross flow membrane bioreactor ultrafiltration system of use |
| CN109694133B (en) * | 2019-02-28 | 2021-10-29 | 广州市世来至福科技有限公司 | Wastewater treatment method and ultrafiltration system of cross flow membrane bioreactor adopted by same |
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