CN220376470U - Curtain type hollow fiber MBR membrane group device - Google Patents

Abstract

The utility model discloses a curtain type hollow fiber MBR membrane group device, which relates to the technical field of sewage treatment, has the advantages of scattering foam on the surface of sewage, and further reducing the possibility that the micro flocs of active microorganisms influence the flux of curtain type hollow fiber MBR membranes, and is technically characterized in that: including the stainless steel frame that is arranged in sewage treatment pond, be fixed with a plurality of curtain type hollow fiber MBR membranes that evenly arrange on the horizontal direction on the stainless steel frame, the delivery port end of each curtain type hollow fiber MBR membrane all is fixed with the drain pipe, and the one end that curtain type hollow fiber MBR membrane was kept away from to a plurality of drain pipes is fixed with the collector pipe, and the water inlet of collector pipe and the water inlet of A suction pump pass through the pipeline intercommunication.

Description

Curtain type hollow fiber MBR membrane group device

Technical Field

The utility model relates to the technical field of sewage treatment, in particular to a curtain type hollow fiber MBR membrane group device.

Background

The Membrane Bioreactor (MBR) is a novel water treatment technology which combines a membrane separation unit and a biological treatment unit, a membrane component is used for replacing a secondary sedimentation tank to keep high active sludge concentration in the bioreactor, so that sewage treatment facilities occupy a space, and the sludge amount is reduced by keeping low sludge load, and compared with the traditional biochemical water treatment technology, the MBR has the following main characteristics: the treatment efficiency is high, the quality of the effluent is good, the equipment is compact, and the occupied area is small; the technology is easy to realize automatic control and simple in operation management, and is paid more attention to in the 80 s, so that the technology becomes one of the hot spots for research, and the membrane bioreactor is applied to more than ten countries such as the United states, germany, france and Egypt at present, and the scale is varied from 6m3/d to 13000m 3/d.

At present, along with the technical progress and the continuous reduction of the cost of an MBR (Membrane Bio-Reactor) process, the technology is more and more widely applied to the fields of municipal sewage, petrochemical wastewater, coal chemical wastewater, landfill leachate, printing and dyeing wastewater, papermaking wastewater, pharmaceutical wastewater, medical wastewater and the like. The MBR membrane mainly comprises a curtain membrane, a flat membrane, a ceramic membrane and the like, wherein the curtain membrane is most widely applied, a plurality of curtain membranes are required to be installed in a membrane frame to form a membrane group device, equipment hoisting, maintenance and matching of a matched system are facilitated, the plurality of membrane group devices are placed in a sewage treatment tank, and an aeration pipe which plays an aeration role on sewage is further arranged at the bottom end of the sewage tank.

Active microorganisms in a traditional sewage treatment tank are condensed into zoogloea which is mutually tightly organized due to the characteristics of the active microorganisms, active sludge in the sewage treatment tank is formed by combining zoogloea with filiform bacteria and the like, sewage in the sewage treatment tank uniformly flows to a curtain-type hollow fiber MBR membrane from the periphery, substances such as active sludge in the sewage are separated by a membrane wire surface separation layer through lower negative pressure suction, produced water flows to the inner side from the membrane wire surface, substances with larger particle diameters such as suspended matters, bacterial colloid and particles in the water are effectively removed through the action of the curtain-type hollow fiber MBR membrane, and the microorganisms are completely trapped in a biological reaction tank through the high-efficiency trapping action of the curtain-type hollow fiber MBR membrane.

However, when the aeration amount in the existing sewage treatment tank is excessive, microorganism metabolism can be basically stopped, the consumption of oxygen is reduced, and then zoogloea is disintegrated to form active microorganism micro-flocs, the active microorganism micro-flocs float to the sewage surface along with bubbles, the bubbles cannot disappear by themselves, and a large number of bubbles can influence the general measurement of the curtain-type hollow fiber MBR membrane.

Disclosure of Invention

Aiming at the technical defects, the utility model aims to provide the curtain type hollow fiber MBR membrane group device which has the advantages of scattering foam on the surface of sewage and further reducing the possibility that micro-flocs of active microorganisms affect the flux of the curtain type hollow fiber MBR membrane.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a curtain type hollow fiber MBR membrane group device, which comprises a stainless steel frame positioned in a sewage treatment tank, wherein a plurality of curtain type hollow fiber MBR membranes which are uniformly arranged in the horizontal direction are fixed on the stainless steel frame, drain pipes are fixed at the water outlet ends of the curtain type hollow fiber MBR membranes, a water collecting pipe is fixed at one end of the drain pipes, which is far away from the curtain type hollow fiber MBR membranes, a water inlet of the water collecting pipe is communicated with a water inlet of an A water suction pump through a pipeline, and a spraying piece for reducing foam on the sewage surface in the sewage treatment tank so as to reduce the possibility of blocking the curtain type hollow fiber MBR membranes caused by sludge disintegration is further arranged on the stainless steel frame.

Through adopting above-mentioned technical scheme, through the effect of A pump, through lower negative pressure suction, substances such as activated sludge in the sewage are separated by membrane silk surface separation layer, produce water and flow from membrane silk surface to the inboard, collect to the drain pipe, and then get into in the collector pipe, effectively get rid of suspended solid in the water through the effect of curtain type hollow fiber MBR diaphragm, bacterial colloid and great particle diameter substances such as granule, high-efficient interception through curtain type hollow fiber MBR diaphragm, make the microorganism hold back completely in the biological reaction tank, through the effect of spraying the piece, when the aeration volume in sewage treatment tank is excessive, break up the bubble of floating on the surface of water in the sewage treatment tank, reduce the foam on sewage surface, make along with the tiny floc of the active microorganism that floats to sewage surface together resume sedimentation performance again, and then reduced the possibility that the tiny floc of active microorganism influences curtain type hollow fiber MBR diaphragm leads to the measurement, spray the piece simultaneously and wash curtain type hollow fiber MBR diaphragm, further reduced the possibility that curtain type hollow fiber MBR diaphragm was blocked, improved the life of curtain type hollow fiber diaphragm membrane.

Preferentially, the spraying piece comprises a B water suction pump fixed at the top of the stainless steel frame, a flow pipe which is radially arranged is fixed at the water outlet end of the B water suction pump, a plurality of evenly distributed spraying pipes which are communicated with the inner cavity of the flow pipe are radially arranged on the flow pipe, a plurality of nozzles which are communicated with the spraying pipes are arranged on one side of the spraying pipes, which faces to the curtain type hollow fiber MBR membrane, of the spraying pipes, and a water inlet of the B water suction pump is communicated with a water inlet pipe through a pipeline.

Through adopting above-mentioned technical scheme, through the effect of B pump to in with the sewage suction runner pipe in the sewage treatment pond, rethread spray pipe and nozzle blowout, B pump, runner pipe, spray pipe and nozzle all are located sewage treatment pond sewage top and do not contact with sewage, so that the rivers of spraying out break up the bubble on sewage surface, the internal diameter of nozzle is less than the internal diameter of spray pipe simultaneously, and the outlet water velocity of flow increases, improves the efficiency of breaking up the bubble.

Preferentially, one end of the water inlet pipe, which is far away from the water suction pump B, is provided with a filtering piece which has a filtering effect on sewage.

Through adopting above-mentioned technical scheme, through the effect of filter to in the sewage through the filtration gets into the spray pipe and spouts through the nozzle, reduced the possibility that sewage blockked up the nozzle, improved the life of device.

Preferentially, the filter piece includes the filter vat, the filter vat inner chamber is cavity, bottom opening, the filter vat bottom is fixed with the conical tube through the flange, the conical tube inner chamber is cavity, open-top, conical tube inner chamber and filter vat inner chamber intercommunication, the one end that the B suction pump was kept away from to the inlet tube is fixed and is communicated with the filter vat inner chamber with the filter vat, the opposite side of filter vat passes through output tube intercommunication with the delivery port of C suction pump, and the water inlet of C suction pump is fixed with the input tube, filter vat inside is fixed with two filter plates, two it has quartz sand to fill between the filter plate.

Through adopting above-mentioned technical scheme, C suction pump is fixed at stainless steel frame top and is not contacted with sewage, through the effect of input tube, sewage in the sewage treatment pond gets into in input tube and the output tube and by the output tube output to the conical tube in, when sewage in the conical tube passes through filter plate and quartz sand, plays the filtration effect to sewage through filter plate and quartz sand's effect, suspended solid and large granule material in the sewage are held back by filter plate and quartz sand and are filtered, and sewage after the filtration gets into in the inlet tube under the effect of B suction pump.

Preferentially, the part of the output pipe extending into the filter vat enters the conical pipe, the part of the output pipe entering the conical pipe is fixedly provided with an umbrella-shaped block, a plurality of discharge pipes which are communicated with the inner cavity of the output pipe and are radially arranged on the output pipe, and a plurality of water outlet pipes which are communicated with the inner cavity of the discharge pipe are arranged on one side of the discharge pipe, facing the umbrella-shaped block.

By adopting the technical scheme, sewage in the output pipe enters the discharge pipe and is discharged through the water outlet pipe and flows to the umbrella-shaped block, and large-particle impurities can move downwards to the bottom end of the conical pipe along the outer wall of the umbrella-shaped block.

Preferentially, an axial aeration pipe is fixed on the stainless steel frame, the top of the aeration pipe is communicated with the aerator, a plurality of aeration branch pipes communicated with the aeration pipe are fixed at the bottom of the aeration pipe, the aeration branch pipes are fixed at the bottom end of the stainless steel frame, and a plurality of aeration ports are formed in one side, facing the curtain type hollow fiber MBR membrane, of the aeration branch pipes.

Through adopting above-mentioned technical scheme, through the effect of aerator, aeration pipe, aeration branch pipe and aeration mouth, play the scouring effect to curtain type hollow fiber MBR diaphragm, slow down the membrane pollution, extension membrane life.

The utility model has the beneficial effects that: through the effect of A pump, through lower negative pressure suction, substances such as activated sludge in sewage are separated by membrane silk surface separating layer, produce water and flow to the inboard from membrane silk surface, collect to the drain pipe, and then get into the collector pipe, effectively get rid of suspended solid in the water through the effect of curtain type hollow fiber MBR diaphragm, bacterial colloid and great particle diameter substances such as granule, high-efficient interception through curtain type hollow fiber MBR diaphragm, make microorganism hold back completely in the biological reaction tank, through the effect of spraying the piece, when the aeration volume in sewage treatment tank is excessive, break up the bubble of floating on the surface of water in the sewage treatment tank, reduce the foam on sewage surface, make along with the little floc of active microorganism come up to sewage surface resume sedimentation performance again, and then reduced the possibility that the little floc of active microorganism influences curtain type hollow fiber MBR diaphragm leads to the measurement, spray the piece simultaneously and wash curtain type hollow fiber MBR diaphragm, further reduced the possibility that curtain type hollow fiber MBR blocks up, the life of curtain type hollow fiber diaphragm has been improved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of the present embodiment;

fig. 2 is a schematic structural view of the reinforcing rod according to the present embodiment;

fig. 3 is a schematic sectional view of the filter vat according to the present embodiment.

Reference numerals illustrate:

in the figure: 1. a stainless steel frame; 101. a reinforcing rod; 102. a first U-shaped hoop; 2. curtain type hollow fiber MBR membrane; 201. a drain pipe; 202. a water collecting pipe; 3. b, a water suction pump; 4. a flow pipe; 5. a water spray pipe; 6. a nozzle; 7. a filter vat; 8. a conical tube; 9. a water inlet pipe; 10. an output pipe; 11. a filter plate; 12. quartz sand; 13. a second U-shaped hoop; 14. umbrella-shaped blocks; 15. a discharge pipe; 16. a water outlet pipe; 17. and (5) aerating the pipe.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

A curtain type hollow fiber MBR membrane group device, as shown in figures 1-3, comprises a stainless steel frame 1 positioned in a sewage treatment tank, wherein a plurality of curtain type hollow fiber MBR membranes 2 uniformly distributed in the horizontal direction are fixed on the stainless steel frame 1, drain pipes 201 are fixed at the water outlet ends of the curtain type hollow fiber MBR membranes 2, a water collecting pipe 202 is fixed at one end, far away from the curtain type hollow fiber MBR membranes 2, of each drain pipe 201, a water inlet of the water collecting pipe 202 is communicated with a water inlet of an A water suction pump through a pipeline, and a first U-shaped hoop 102 which plays a role in fixing the water collecting pipe 202 is fixed on the stainless steel frame 1.

As shown in fig. 1 and 2, active microorganisms in the sewage treatment tank are condensed into zoogloea which is mutually tightly organized due to the characteristics of the active microorganisms, the active sludge in the sewage treatment tank is formed by combining zoogloea with filiform bacteria and the like, sewage in the sewage treatment tank uniformly flows to the curtain-type hollow fiber MBR membrane 2 from the periphery, substances such as active sludge in the sewage are separated by the membrane wire surface separation layer through the action of the water pumping pump A by lower negative pressure suction, produced water flows to the inner side from the membrane wire surface, and is collected to the drain pipe 201 and then enters the water collecting pipe 202, and substances with larger particle sizes such as suspended matters, bacterial colloid and particles in the water are effectively removed through the action of the curtain-type hollow fiber MBR membrane 2, so that the microorganisms are completely trapped in the biological reaction tank through the high-efficiency trapping action of the curtain-type hollow fiber MBR membrane 2.

As shown in fig. 1 and 2, in order to strengthen the strength of the stainless steel frame 1 to reduce the possibility that the stainless steel frame 1 breaks due to the increase of gravity of the curtain type hollow fiber MBR membrane 2 in long-term use, a plurality of reinforcing rods 101 for strengthening the strength of the stainless steel frame 1 are fixed on the stainless steel frame 1.

As shown in fig. 1 and 2, an axial aeration pipe 17 is fixed on the stainless steel frame 1, the top of the aeration pipe 17 is communicated with an aerator, a plurality of aeration branch pipes communicated with the aeration pipe 17 are fixed at the bottom of the aeration pipe 17, the aeration branch pipes are fixed at the bottom end of the stainless steel frame 1, a plurality of aeration ports are formed in one side of the aeration branch pipes, which faces to the curtain type hollow fiber MBR membrane 2, and the aeration pipes, the aeration pipes 17, the aeration branch pipes and the aeration ports play a scouring role on the curtain type hollow fiber MBR membrane 2, so that membrane pollution is slowed down, and the service life of the membrane is prolonged.

As shown in fig. 1 and fig. 2, however, when the aeration amount of the sewage treatment tank is excessive, the metabolism of microorganisms is basically stopped, the consumption of oxygen is reduced, and zoogloea is further caused to disintegrate to form active microorganism micro-flocs, and meanwhile, nitrogen is adsorbed on the active microorganism micro-flocs and floats upwards in the sewage treatment tank to influence the general measurement of the curtain-type hollow fiber MBR membrane 2, and when the sewage treatment tank contains grease substances or lipid-containing microorganisms, foam is easily generated in a water body, and further the flux of the curtain-type hollow fiber MBR membrane 2 is influenced.

As shown in fig. 1 and 2, in order to solve the above problems, the stainless steel frame 1 is further provided with a spraying member for reducing the foam on the sewage surface in the sewage treatment tank to reduce the blocking possibility of the curtain type hollow fiber MBR membrane 2 caused by the disintegration of the sludge, and the bubbles floating on the water surface in the sewage treatment tank are scattered by the action of the spraying member, so that the sedimentation performance is restored again along with the floating of the micro-flocs of the active microorganisms on the sewage surface, the possibility that the micro-flocs of the active microorganisms affect the communication measurement of the curtain type hollow fiber MBR membrane 2 is reduced, the curtain type hollow fiber MBR membrane 2 is flushed by the spraying member, the blocking possibility of the curtain type hollow fiber MBR membrane 2 is further reduced, and the service life of the curtain type hollow fiber MBR membrane 2 is prolonged.

As shown in fig. 1 and 2, the spraying piece includes the B suction pump 3 of fixing at stainless steel frame 1 top, B suction pump 3 is fixed with waterproof cover on not with sewage contact and B suction pump 3, the play water end of B suction pump 3 is fixed with the runner pipe 4 of radial setting, radially be equipped with a plurality of evenly distributed on the runner pipe 4 and with runner pipe 4 inner chamber intercommunication's spray pipe 5, the spray pipe 5 length is greater than curtain hollow fiber MBR diaphragm 2's width, one side of spray pipe 5 orientation curtain hollow fiber MBR diaphragm 2 is equipped with a plurality of nozzles 6 with spray pipe 5 intercommunication, the water inlet of B suction pump 3 communicates with inlet tube 9 through the pipeline, through the effect of B suction pump 3, in order to draw sewage suction runner pipe 4 with in the sewage treatment pond, rethread spray pipe 5 and nozzle 6 blowout, B suction pump 3, runner pipe 4, spray pipe 5 and nozzle 6 all are located sewage treatment pond sewage top and do not contact, so that the inner diameter of spray pipe 6 breaks up the bubble on the sewage surface, the internal diameter of spray pipe 6 is less than the internal diameter of curtain hollow fiber MBR diaphragm 2, the increase of water outlet flow rate improves the bubble of spray pipe 6.

As shown in fig. 1 and 2, the sewage in the sewage treatment tank contains a part of substances such as activated sludge, and when the sewage directly enters the nozzle 6, the nozzle 6 is easily blocked to influence the service life of the nozzle 6, so that a filter element for filtering the sewage is arranged at one end of the water inlet pipe 9, which is far away from the water suction pump 3B.

As shown in fig. 1, 2 and 3, the filter element comprises a filter vat 7, the inner cavity of the filter vat 7 is hollow, the bottom of the filter vat 7 is opened, a conical tube 8 is detachably fixed at the bottom of the filter vat 7 through a flange, the inner cavity of the conical tube 8 is hollow, the top of the filter vat is opened, the inner cavity of the conical tube 8 is communicated with the inner cavity of the filter vat 7, a rubber sealing ring is fixed at a gap between the filter vat 7 and the conical tube 8, and the possibility that sewage flows out from the gap between the filter vat 7 and the conical tube 8 is reduced.

As shown in fig. 1, 2 and 3, one end of the water inlet pipe 9 far away from the water suction pump 3B is fixed with the filter vat 7 and is communicated with the inner cavity of the filter vat 7, the other side of the filter vat 7 is communicated with the water outlet of the water suction pump C through the output pipe 10, the water inlet of the water suction pump C is fixed with an input pipe, the water suction pump C is fixed at the top of the stainless steel frame 1 and is not contacted with sewage, the part of the output pipe 10 extending into the filter vat 7 enters the conical pipe 8, the part of the output pipe 10 entering into the conical pipe 8 is fixed with an umbrella-shaped block 14 positioned at the bottom end inside the conical pipe 8, a plurality of discharge pipes 15 which are communicated with the inner cavity of the output pipe 10 and are radially arranged on the output pipe 10, the discharge pipes 15 are positioned above the umbrella-shaped block 14, one side of the discharge pipes 15 facing the inner cavity of the discharge pipes 15 is provided with a plurality of water outlet pipes 16 communicated with the inner cavity of the discharge pipes 15, and the water outlet pipes 16 are communicated with the inner cavity of the filter vat 7.

As shown in fig. 1, 2 and 3, under the action of the pump C, the sewage in the sewage treatment tank enters the input pipe, the sewage in the input pipe enters the output pipe 10, the sewage in the output pipe 10 enters the output pipe 15 and is discharged through the outlet pipe 16, and flows to the umbrella-shaped block 14, and the large-particle impurities move downwards to the bottom end of the conical pipe 8 along the outer wall of the umbrella-shaped block 14.

As shown in fig. 1, 2 and 3, two filter plates 11 positioned above a discharge pipe 15 are fixed in the filter vat 7, quartz sand 12 is filled between the two filter plates 11, along with sewage entering the conical pipe 8, dirt in the sewage is settled at the bottom end inside the conical pipe 8, after the sewage contacts with the quartz sand 12, the sewage is filtered through the actions of the filter plates 11 and the quartz sand 12, suspended matters and large particulate matters in the sewage are trapped and filtered by the filter plates 11 and the quartz sand 12, then the water suction pump 3B is opened, the filtered sewage enters the water inlet pipe 9 under the action of the water suction pump 3B, and the possibility that the nozzle 6 is blocked is reduced.

When the dirt in the filter vat 7 needs to be cleaned, as shown in fig. 1, 2 and 3, the conical tube 8 is opened by the action of the flange, and the dirt in the conical tube 8 and the filter vat 7 is cleaned.

As shown in fig. 1 and 2, in order to reduce the possibility that the stainless steel frame 1 is inclined due to the heavy weight of the filter basket 7, a second U-shaped hoop 13 for fixing and positioning the filter basket 7 and the tapered tube 8 is fixed to the stainless steel frame 1.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (6)

1. The utility model provides a curtain formula hollow fiber MBR membrane group ware, its characterized in that, including stainless steel frame (1) that is arranged in the sewage treatment pond, be fixed with a plurality of curtain formula hollow fiber MBR membrane (2) that evenly arrange on the horizontal direction on stainless steel frame (1), each the delivery port end of curtain formula hollow fiber MBR membrane (2) all is fixed with drain pipe (201), a plurality of drain pipe (201) keep away from the one end of curtain formula hollow fiber MBR membrane (2) and are fixed with collector pipe (202), the water inlet of collector pipe (202) and the water inlet of A suction pump pass through the pipeline intercommunication, still be equipped with the foam that reduces the sewage surface in the sewage treatment pond on stainless steel frame (1) in order to reduce mud disintegration and lead to the spray member of curtain formula hollow fiber MBR membrane (2) jam possibility.

2. The curtain type hollow fiber MBR membrane group device as claimed in claim 1, wherein the spraying part comprises a B water suction pump (3) fixed at the top of the stainless steel frame (1), a flow pipe (4) arranged radially is fixed at the water outlet end of the B water suction pump (3), a plurality of spray pipes (5) which are uniformly distributed and communicated with the inner cavity of the flow pipe (4) are radially arranged on the flow pipe (4), a plurality of nozzles (6) communicated with the spray pipes (5) are arranged on one side of the spray pipes (5) facing the curtain type hollow fiber MBR membrane (2), and the water inlet of the B water suction pump (3) is communicated with the water inlet pipe (9) through a pipeline.

3. A curtain type hollow fiber MBR membrane module device as claimed in claim 2, characterized in that a filtering piece for filtering sewage is arranged at one end of the water inlet pipe (9) far away from the B water pump (3).

4. A curtain type hollow fiber MBR membrane group device as claimed in claim 3, wherein the filter element comprises a filter vat (7), the inner cavity of the filter vat (7) is hollow, the bottom is open, a conical tube (8) communicated with the inner cavity of the filter vat (7) is fixed at the bottom of the filter vat (7) through a flange, one end of the water inlet tube (9) away from the B water suction pump (3) is fixed with the filter vat (7) and communicated with the inner cavity of the filter vat (7), the other side of the filter vat (7) is communicated with the water outlet of the C water suction pump through an output tube (10), an input tube is fixed at the water inlet of the C water suction pump, two filter plates (11) are fixed at the wall of the inner cavity of the filter vat (7), and quartz sand (12) is filled between the two filter plates (11).

5. A curtain type hollow fiber MBR membrane module device as claimed in claim 4, wherein a part of the output pipe (10) extending into the filter vat (7) enters the conical pipe (8), an umbrella-shaped block (14) is fixed on a part of the output pipe (10) entering the conical pipe (8), a plurality of discharge pipes (15) which are communicated with the inner cavity of the output pipe (10) and are radially arranged on the output pipe (10), and a plurality of water outlet pipes (16) which are communicated with the inner cavity of the discharge pipe (15) are arranged on one side of the discharge pipe (15) facing the umbrella-shaped block (14).

6. The curtain type hollow fiber MBR membrane module device as claimed in claim 1, wherein an axial aeration pipe (17) is fixed on the stainless steel frame (1), the top of the aeration pipe (17) is communicated with the aerator, a plurality of aeration branch pipes communicated with the aeration pipe (17) are fixed at the bottom of the aeration pipe (17), the aeration branch pipes are fixed at the bottom end of the stainless steel frame (1), and a plurality of aeration ports are formed in one side, facing the curtain type hollow fiber MBR membrane (2), of the aeration branch pipes.