MBR membrane bioreactor for deep sewage treatment in urban sewage treatment plants

Abstract

The present invention belongs to the technical field of sewage treatment, in particular to an MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant. Aiming at the problems existing in the existing membrane filter tube cleaning process, such as interruption of sewage treatment process, incomplete cleaning and clogging of aeration holes by dirt, the following scheme is proposed, including a sewage pool, wherein two treatment pools are provided in the sewage pool, fixed pipes are fixed in both treatment pools, two hollow rotating disks are rotatably sleeved on the outer walls of the two fixed pipes, and a plurality of membrane filter tubes are rotatably connected between the two hollow rotating disks located in the same treatment pool. In the present invention, the treatment pools can be used alternately when cleaning the membrane filter tubes, so that sewage treatment can be continued and the membrane filter tubes can be cleaned. In the cleaning process, the inner wall of the membrane filter tube can be evenly coated with a cleaning agent, thereby effectively cleaning the membrane filter tube.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to an MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant. Background Art

[0002] The MBR membrane bioreactor is a novel wastewater treatment system that organically combines membrane separation technology with biological treatment technology. It replaces the secondary sedimentation tank at the end of traditional biological treatment technology with membrane modules. This maintains a high activated sludge concentration within the bioreactor, increasing the organic load of biological treatment, thereby reducing the wastewater treatment facility footprint and reducing excess sludge by maintaining a low sludge load. The system primarily utilizes membrane separation equipment immersed in an aerobic biological tank to intercept activated sludge and macromolecular organic matter within the tank.

[0003] In the existing technology, the following deficiencies still exist when treating sewage through MBR membrane-bioreactor:

[0004] 1. The surface of the membrane filter tube is used to clean the sludge particles, but a large amount of dirt will adhere to the surface of the membrane filter tube over a long period of time, which will interrupt the entire sewage treatment process during cleaning and affect the efficiency of sewage treatment;

[0005] 2. The membrane filter tube cannot be cleaned effectively and thoroughly, which affects the later filtration effect of the membrane filter tube;

[0006] 3. Aeration is generally required during sewage treatment. Oxygen is essential for maintaining the healthy functioning of biological communities in sewage and can promote the decomposition of organic matter and the conversion of nitrogen. However, if the aeration pipe is left in the sewage pool for a long time, the aeration holes may be easily clogged by dirt in the sewage pool, affecting the subsequent aeration effect.

[0007] In response to the above problems, the present invention document proposes an MBR membrane bioreactor for deep sewage treatment in urban sewage treatment plants. Summary of the Invention

[0008] The purpose of the present invention is to solve the shortcomings of the existing membrane filter tube cleaning, which leads to the interruption of the entire sewage treatment process, the inability to effectively and comprehensively clean the membrane filter tube, and the aeration holes being blocked by dirt in the sewage pool. The MBR membrane bioreactor for deep sewage treatment in urban sewage treatment plants is proposed.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] An MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant comprises a sewage pool, wherein two treatment pools are provided in the sewage pool, wherein fixed pipes are fixed in both treatment pools, wherein two hollow rotating disks are rotatably sleeved on the outer walls of the two fixed pipes, and a plurality of membrane filter tubes are rotatably connected between the two hollow rotating disks located in the same treatment pool, and the two treatment pools and the plurality of membrane filter tubes cooperate to alternately complete sewage treatment;

[0011] The outer wall of the fixed tube is provided with a plurality of through holes, and the hollow rotating disk is connected to the fixed tube through the plurality of through holes;

[0012] It also includes a medicine storage box fixed on the top of the sewage tank, a multi-stage cylinder fixed on the top of the medicine storage box, an output shaft of the multi-stage cylinder extending into the medicine storage box and fixed with a sealing plate, and the sealing plate sliding in the medicine storage box for injecting cleaning agents into the multiple membrane filter tubes in the two treatment tanks;

[0013] It also includes a tee pipe fixed on one side of the sewage tank, and the liquid inlet end of the tee pipe is connected to the external sewage sedimentation tank, and the two liquid outlet ends of the tee pipe are respectively connected to the two treatment tanks, and the inner wall of one side of the two treatment tanks is slidably connected to the same closing plate for alternately blocking the two liquid outlet ends of the tee pipe;

[0014] Among them, transfer pipes are fixed on the inner walls of the two treatment pools on the sides away from each other, which are used to inject air into the treatment pools;

[0015] A control structure, provided on one side of the closing plate, for controlling the movement of the closing plate;

[0016] an aeration structure, disposed in the treatment tank and used to inject air into the treatment tank;

[0017] The drug injection structure is arranged in the drug storage box and is used to inject cleaning agents into the membrane filter tube to remove dirt attached to the outer wall of the membrane filter tube;

[0018] The flushing structure is arranged in the treatment tank and is used to clean the residual cleaning agent on the membrane filter tube.

[0019] In one possible design, the control structure includes two trapezoidal blocks fixed on one side of the closing plate, and the two trapezoidal blocks are respectively located in two treatment pools, and a plurality of push plates are fixed on one side of the two hollow rotating disks close to each other, and the trapezoidal blocks cooperate with adjacent push plates; the hollow rotating disk drives the push plate to rotate, and the push plate cooperates with the inclined surface of the trapezoidal block to drive the trapezoidal block and the closing plate to move. At this time, the closing plate can just block one liquid inlet end of the three-way pipe, and the magnetic block and the closing plate generate magnetic attraction to ensure the stability of the closing plate blocking one end of the magnetic block, so that the treatment pool can be replaced, which can not only continue to complete the sewage treatment but also clean the membrane filter tube.

[0020] In one possible design, the aeration structure includes a plurality of aeration tubes rotating on the inner wall of one side of the treatment tank, one end of each of the aeration tubes being rotatably connected to a transfer tube, and the aeration tubes being communicated with the transfer tube, an air injection tube being fixed to one side of the transfer tube, one end of the air injection tube being fixedly extended to one side of the sewage tank and being communicated with an external blower, a plurality of arc-shaped baffles being fixed to the inner wall of the bottom of the treatment tank through pillars, and the aeration tubes being rotatably arranged in the arc-shaped baffles for supporting the aeration tubes; air is injected into the aeration tubes through the blower, the air injection tubes and the transfer tube, and air is injected into the treatment tank through the aeration tubes for sewage treatment.

[0021] In one possible design, the flushing structure includes a rotating rod that rotates on the top of the sewage pool through a base, the outer wall of the rotating rod is fixed with two second rubber wheels, and the two second rubber wheels respectively cooperate with two hollow rotating disks to drive the hollow rotating disks to rotate, the outer walls of the multiple membrane filter tubes are fixed with two first rubber wheels, and the two adjacent first rubber wheels on the same side touch each other to achieve transmission connection, the inner wall of the side away from each other of the treatment pool is fixed with an arc plate, and the arc plate touches the first rubber wheel, and the friction between the arc plate and the first rubber wheel drives the first rubber wheel to rotate, and one side of the sewage pool is fixed with a frame through A first water pump, one end of the fixed pipe is fixedly passed through the inner wall of one side of the sewage pool and extends to one side of the sewage pool, a first three-way valve is fixed to the bottom of the fixed pipe through a hose, one port of the first three-way valve is connected with the first water pump, and is used to extract the water treated by the membrane filter tube, and the other port of the first three-way valve is fixed with a first water inlet pipe, and the first water inlet pipe is connected with an external water source, and is used to inject clean water into the hollow rotating disk and the membrane filter tube; clean water is injected into the fixed pipe through the cooperation of the first water inlet pipe and the first three-way valve, and the clean water is injected into the corresponding hollow rotating disk through the through hole and enters the membrane filter tube, thereby flushing the interior of the membrane filter tube.

[0022] In a possible design, the flushing structure also includes two closing blocks fixed in the fixed tube, a reciprocating threaded rod is rotatably connected between the two closing blocks, the outer wall thread sleeve of the reciprocating threaded rod is provided with a nut block, the top of the fixed tube is provided with a rectangular groove, the rectangular groove is slidably connected with a connecting block fixedly connected to the nut block, the outer wall sliding sleeve of the fixed tube is provided with a liquid storage ring, the top of the connecting block is fixedly connected to the top inner wall of the liquid storage ring, the outer wall of the liquid storage ring is fixed with a plurality of nozzles for flushing the outer wall of the rotating middle membrane filter tube, one end of the reciprocating threaded rod rotates through one of the closing blocks and extends to one side of the fixed tube, the reciprocating threaded rod and the rotating rod are connected by a synchronous wheel, A synchronous belt drive connection is used to drive the liquid storage ring to move back and forth. A third water pump is fixed to one side of the sewage pool through a frame. The liquid inlet of the third water pump is connected to an external water source through a hose. The liquid outlet of the third water pump is fixed with a second water inlet pipe. The second water inlet pipe is fixed through the closing block and is connected to the liquid storage ring to provide clean water to the nozzle; the third water pump cooperates with the second water inlet pipe to inject clean water into the liquid storage ring, and the clean water is sprayed outward through the nozzle, and the reciprocating threaded rod drives the liquid storage ring to move back and forth in a straight line through the nut block. Multiple nozzles flush the outer wall of the rotating membrane filter tube. The combination of inside and outside can fully complete the flushing operation of the membrane filter tube to avoid residual cleaning agents in the membrane filter tube, which affects the later sewage treatment effect.

[0023] In one possible design, the drug injection structure includes two drug injection tubes fixed at the bottom of the drug storage box, and the two drug injection tubes are respectively used to provide cleaning agents to multiple membrane filter tubes in the two treatment pools, the bottom ends of the drug injection tubes are connected to the fixed tube, and the drug injection tubes cooperate with the through holes to inject cleaning agents into the corresponding hollow rotating disks, the bottom inner wall of the drug storage box is rotatably connected to two rotating plates through a rotating shaft, and the two rotating plates are respectively used to seal the two drug injection tubes, and a first clearance groove is provided in each of the two rotating plates, and a first pin rod is slidably fitted in each of the two first clearance grooves, and the same U-shaped frame is fixed at both ends of the first pin rod, and two pull rods are sealed and slidably passed through the bottom inner wall of the drug storage box, and the top ends of the two pull rods are respectively fixedly connected to the bottom of the corresponding U-shaped frame, and the bottom ends of the two pull rods are fixed with push plates, and the bottom of the drug storage box is provided with two centrifugal structures, and the push plates and the centrifugal structures The structure is used to drive the rotating plate to rotate to complete the opening and closing of the injection tube; the rotating rod drives the turntable to rotate when it rotates, and the centrifugal block moves outward under the action of centrifugal force, the tension spring is stretched, and the centrifugal block drives the push plate and the pull rod to move downward, and the pull rod drives the rotating plate to rotate through the cooperation of the first pin and the first give way groove, thereby releasing the blocking of the injection tube by the rotating plate, and the output shaft of the multi-stage cylinder pushes the sealing plate to move downward, which is used to quickly inject the cleaning agent into the fixed tube through the injection tube, and enter the corresponding hollow rotating disk through the through hole, and then enter the membrane filter tube through the hollow rotating disk. Since the second rubber wheel drives the hollow rotating disk to rotate, the hollow rotating disk drives multiple membrane filter tubes to rotate, and the adjacent two membrane filter tubes are connected by the first rubber wheel transmission. Therefore, under the action of the arc plate, multiple membrane filter tubes can be driven to rotate. At this time, the cleaning agent in the membrane filter tube can be evenly distributed in the membrane filter tube, and dirt can be comprehensively and effectively removed.

[0024] In one possible design, the centrifugal structure includes a turntable rotating under the medicine storage box, and a plurality of sliding grooves are provided on one side of the turntable, and a centrifugal block is slidably connected in the plurality of sliding grooves, and the centrifugal block cooperates with the push plate to drive the push plate to move, and a tension spring is fixed on one side of the plurality of centrifugal blocks, and the ends of the plurality of tension springs close to each other are respectively fixedly connected to the inner wall of one side of the corresponding sliding groove, and the other side of the turntable is fixedly connected to one end of the adjacent rotating rod; the rotating rod drives the turntable to rotate when it rotates, and the centrifugal block moves outward under the action of centrifugal force, the tension spring is stretched, and the centrifugal block drives the push plate and the pull rod to move downward, and the pull rod drives the rotating plate to rotate through the cooperation of the first pin rod and the first give way groove, thereby releasing the blocking of the rotating plate on the medicine injection tube.

[0025] In a possible design, a second water pump is fixed to the side of the sewage pool away from the three-way pipe through a frame, a second three-way valve is fixed to the liquid inlet end of the second water pump, and the two liquid inlet ports of the second three-way valve are connected to the two treatment pools through a hose, and a third three-way valve is fixed to the liquid outlet end of the second water pump, and the two liquid outlet ports of the third three-way valve are connected to the two treatment pools through a hose; the second water pump cooperates with the third three-way valve and the third three-way valve to discharge the remaining sewage in the treatment pool into another treatment pool according to the situation, so as to facilitate the cleaning of the membrane filter tube in the later stage.

[0026] In one possible design, a magnetic block is fixed to the inner wall of one side of the two treatment pools, and an iron sheet layer is fixed to both sides of the closing plate, and a magnetic attraction force is generated between the magnetic block and the iron sheet layer to control the stability of the closing plate.

[0027] In a possible design, a driving structure is provided in each of the two treatment tanks, and the driving structure is used to drive the rotation of the multiple aeration pipes in the treatment tanks;

[0028] The driving structure includes a gear that rotates in the treatment tank, and the gear is fixedly sleeved on the outer wall of one of the aeration pipes. The outer walls of the multiple aeration pipes are connected by synchronous wheels and synchronous belts. A push rod slides through the sewage tank, and a rack is fixed to the bottom end of the push rod, and the rack is meshed with the gear to drive the aeration pipe to rotate. A second pin is fixed through the top end of the push rod. The inner walls of the two rotating plates on the side away from each other are each provided with a second makeshift groove, and the two ends of the second pin extend into the two second makeshift grooves respectively, and the second pin slides with the second makeshift groove; when the second water pump is turned on, the second pin is turned on. When the sewage in one treatment tank is pumped into another treatment tank, the rotating rod rotates rapidly to drive the rotating plate to rotate and release the blockage of the injection pipe. At this time, the rotating plate drives the rack to move upward through the cooperation of the second give way groove and the second pin rod. The rack drives one of the aeration pipes to rotate through the gear, and multiple aeration pipes are connected by synchronous wheels and synchronous belts. Therefore, the aeration pipe rotates 180°, and the arc-shaped baffle closes the aeration hole of the aeration pipe to prevent dirt from blocking the aeration hole as the water level drops during the sewage extraction process. When the water level is lower than the arc-shaped baffle, the rotating rod rotates slowly to flush the membrane filter tube.

[0029] Beneficial effects: In the present invention, the bottom inner wall of the medicine storage box is rotatably connected to two rotating plates, and a first pin rod is slidably engaged with the rotating plate through a first giving groove, the top end of the pull rod is fixedly connected to the bottom of the U-shaped frame, and the bottom end of the pull rod is fixed with a push plate, and the bottom of the medicine storage box is provided with two centrifugal structures, and the push plates cooperate with the centrifugal structures; the centrifugal block moves outward under the action of centrifugal force, and the centrifugal block drives the rotating plate to rotate through the cooperation of the push plate and the pull rod, thereby releasing the blockage of the medicine injection tube, and the cleaning agent can enter the membrane filter tube through the hollow rotating disk, and while the hollow rotating disk drives the multiple membrane filter tubes to revolve, the multiple membrane filter tubes also rotate, so that the cleaning agent can be evenly distributed in the membrane filter tube, and dirt can be comprehensively and effectively removed;

[0030] In the present invention, a three-way pipe is fixed on one side of the sewage pool, and the two liquid outlet ends of the three-way pipe are respectively connected to the two treatment pools, and the inner walls of one side of the two treatment pools are slidably connected with the same closing plate, and two trapezoidal blocks on one side of the closing plate are matched with adjacent pushing plates; the hollow rotating disk drives the pushing plate to rotate, and the pushing plate cooperates with the inclined surface of the trapezoidal block to drive the trapezoidal block and the closing plate to move, at which time the closing plate can just block one liquid inlet end of the three-way pipe, and the magnetic stopper and the closing plate generate magnetic attraction to ensure the stability of the closing plate blocking one end of the magnetic stopper, so that the treatment pool can be replaced, which can not only continue to complete the sewage treatment but also clean the membrane filter tube;

[0031] In the present invention, the outer wall of the rotating rod is fixedly sleeved with two second rubber wheels, the outer walls of the plurality of membrane filter tubes are fixedly sleeved with two first rubber wheels, the two first rubber wheels are transmission-connected, the inner walls of the treatment pools on the sides away from each other are fixed with arc-shaped plates, the bottom of the fixed tube is fixed with a first three-way valve through a hose, and the other port of the first three-way valve is fixed with a first water inlet pipe; clean water is injected into the fixed tube through the cooperation of the first water inlet pipe and the first three-way valve, and the clean water is injected into the corresponding hollow rotating disk through the through hole and enters the membrane filter tube, thereby flushing the interior of the membrane filter tube.

[0032] In the present invention, a reciprocating threaded rod is rotatably connected between the two closing blocks, and a nut block is provided in a threaded sleeve on the outer wall of the reciprocating threaded rod. The nut block is fixed with a liquid storage ring through the connecting block, and a plurality of nozzles are fixed to the outer wall of the liquid storage ring. The reciprocating threaded rod and the rotating rod are connected by a synchronous wheel and a synchronous belt transmission; the third water pump cooperates with the second water inlet pipe to inject clean water into the liquid storage ring, and the clean water is sprayed to the outside through the nozzle, and the reciprocating threaded rod drives the liquid storage ring to move back and forth in a straight line through the nut block, and the plurality of nozzles flush the outer wall of the rotating membrane filter tube. The combination of inside and outside can fully complete the flushing operation of the membrane filter tube, avoid residual cleaning agents in the membrane filter tube, and affect the later sewage treatment effect.

[0033] In the present invention, the gear is fixedly sleeved on the outer wall of one of the aeration tubes, and the outer walls of the plurality of aeration tubes are connected by synchronous wheels and synchronous belt transmissions. A rack is fixed to the bottom end of the push rod, and a second pin is fixedly passed through the top end of the push rod. The inner walls of the two rotating plates on the side away from each other are provided with second makeshift grooves, and the two ends of the second pin extend into the two second makeshift grooves respectively; the rotating plate drives the rack to move upward through the cooperation of the second makeshift groove and the second pin, and drives the aeration tube to rotate 180° through the gear, and the arc-shaped baffle closes the aeration hole of the aeration tube to prevent dirt from blocking the aeration hole as the water level drops during the sewage extraction process.

[0034] In the present invention, the treatment pools can be used alternately when cleaning the membrane filter tubes, which can not only continue to complete the sewage treatment but also clean the membrane filter tubes. In the cleaning process, the inner wall of the membrane filter tubes can be evenly coated with the cleaning agent, effectively cleaning the membrane filter tubes. In addition, after cleaning, the membrane filter tubes can be cleaned synchronously from the inside and outside of the membrane filter tubes, thereby comprehensively and effectively completing the cleaning of the membrane filter tubes. When the cleaning agent is injected, the aeration tubes can also be driven to rotate to prevent dirt in the sewage from clogging the aeration holes of the aeration tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the three-dimensional structure of an MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant provided in Example 1 of the present invention from a first perspective;

[0036] Figure 2 This is a schematic three-dimensional cross-sectional structure diagram of an MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant provided in Example 1 of the present invention;

[0037] Figure 3 This is a schematic diagram of the main cross-sectional structure of the hollow rotating disk and fixed pipe of the MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant provided in Example 1 of the present invention;

[0038] Figure 4 This is a schematic diagram of the three-dimensional exploded structure of the hollow rotating disk, curved plate, membrane filter tube and second rubber wheel of the MBR membrane bioreactor for deep sewage treatment in urban sewage treatment plants provided by Example 1 of the present invention;

[0039] Figure 5 This is a partial three-dimensional cross-sectional structural diagram of the fixed pipe and liquid storage ring of the MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant provided in Example 1 of the present invention;

[0040] Figure 6 This is a schematic diagram of a three-dimensional exploded structure of a push plate, a trapezoidal block and a tee pipe of an MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant provided in Example 1 of the present invention;

[0041] Figure 7 A schematic diagram of a partial three-dimensional cross-sectional structure of the third water pump of the MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant provided in Example 1 of the present invention;

[0042] Figure 8 This is a schematic diagram of a three-dimensional exploded structure of a rotating plate, a U-shaped frame and a push plate of an MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant provided in Example 1 of the present invention;

[0043] Figure 9 This is a schematic diagram of a three-dimensional exploded structure of a push plate, a centrifugal block and a turntable of an MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant provided in Example 1 of the present invention;

[0044] Figure 10 A schematic diagram of the three-dimensional structure of an MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant provided in Example 1 of the present invention from a second perspective;

[0045] Figure 11 This is a schematic diagram of the three-dimensional coordination structure of the aeration pipe, rotating plate and rack of the MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant provided by Example 2 of the present invention;

[0046] Figure 12 This is a schematic diagram of the three-dimensional cross-sectional coordination structure of the rotating plate of the MBR membrane bioreactor for deep sewage treatment in an urban sewage treatment plant provided by Example 2 of the present invention.

[0047] Figure: 1, sewage tank; 2, treatment tank; 3, fixed pipe; 4, through hole; 5, hollow rotating disk; 6, membrane filter tube; 7, first rubber wheel; 8, curved plate; 9, rotating rod; 10, second rubber wheel; 11, first three-way valve; 12, first water pump; 13, first water inlet pipe; 14, push plate; 15, three-way pipe; 16, closing plate; 17, trapezoidal block; 18, magnet block; 19, second water pump; 20, second three-way valve; 21, third three-way valve; 22, closing block; 23, reciprocating threaded rod; 24, nut block; 25, liquid storage ring ; 26. Nozzle; 27. Third water pump; 28. Second water inlet pipe; 29. ​​Sealing plate; 30. Medicine injection pipe; 31. Rotating plate; 32. First clearance groove; 33. First pin rod; 34. U-shaped frame; 35. Pull rod; 36. Push plate; 37. Turntable; 38. Sliding groove; 39. Centrifugal block; 40. Tension spring; 41. Transfer pipe; 42. Air injection pipe; 43. Aeration pipe; 44. Arc baffle; 45. Gear; 46. Rack; 47. Push rod; 48. Second clearance groove; 49. Second pin rod; 50. Medicine storage box; 51. Multi-stage cylinder. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0049] Example 1: Reference Figures 1-4 The MBR membrane bioreactor is used in the field of sewage treatment and mainly includes a sewage pool 1, which is divided into two independent and adjacent treatment pools 2. A fixed pipe 3 is fixed in each treatment pool 2, and a plurality of through holes 4 are evenly distributed on the outer wall of the fixed pipe 3. Around each fixed pipe 3, two hollow rotating disks 5 are rotatably sleeved on the outer wall of the fixed pipe 3 through the through holes 4. The two hollow rotating disks 5 are rotatably connected by a plurality of membrane filter tubes 6. The arrangement of the treatment pool 2 and the membrane filter tubes 6 enables the two treatment pools 2 to perform sewage treatment work alternately.

[0050] Reference Figure 1 、 Figure 3 and Figure 7 A medicine storage box 50 is fixedly mounted on top of the sewage tank 1, and a multi-stage cylinder 51 is mounted on top of the medicine storage box 50. The output shaft of the multi-stage cylinder 51 extends into the medicine storage box 50 and is fixedly connected to a sealing plate 29. The sealing plate 29 can slide and seal within the medicine storage box 50. When it is necessary to inject a cleaning agent into the membrane filter tube 6, the multi-stage cylinder 51 drives the sealing plate 29 to move, releasing the agent into the membrane filter tube 6 to remove dirt adhering to the outer wall of the membrane filter tube 6.

[0051] Reference Figure 1 and Figure 6 Sewage is introduced from an external sewage sedimentation tank through the liquid inlet end of a tee pipe 15. The two liquid outlet ends of the tee pipe 15 are respectively connected to the two treatment tanks 2. A closing plate 16 is slidably connected to the inner wall of one side of the two treatment tanks 2. The closing plate 16 can slide between the two treatment tanks 2, alternately blocking the two liquid outlet ends of the tee pipe 15, thereby achieving alternating sewage treatment.

[0052] Reference Figure 1 and Figure 6 The control structure includes two trapezoidal blocks 17 fixed on one side of the closing plate 16. The two trapezoidal blocks 17 are respectively located in the two treatment tanks 2. A plurality of push plates 14 are fixed on one side of the two hollow rotating disks 5 close to each other.

[0053] Specifically, when the hollow rotating disk 5 rotates, the push plate 14 engages the inclined surface of the trapezoidal block 17, driving the trapezoidal block 17 and the sealing plate 16 to move. During this movement, the sealing plate 16 alternately blocks the two liquid outlets of the tee pipe 15, achieving alternating treatment of the wastewater. Furthermore, to enhance the stability of the sealing plate 16, a magnetic block 18 is provided within the treatment tank 2. This magnetic block generates a magnetic attraction with the sealing plate 16, ensuring that it can stably block the liquid outlet.

[0054] Reference Figure 2 The aeration structure includes a plurality of aeration tubes 43 rotatably installed on the inner wall of one side of each treatment tank 2. One end of these aeration tubes 43 is rotatably connected and communicated with the transfer tube 41, and the transfer tube 41 is connected to the external blower through the air injection tube 42. One end of the air injection tube 42 is fixedly extended to one side of the sewage tank 1 to facilitate the connection of the blower. A plurality of arc-shaped baffles 44 are fixed to the inner wall of the bottom of the treatment tank 2 through pillars, and the aeration tubes 43 are rotatably set in the arc-shaped baffles 44 to obtain stable support. When the blower is working, air enters the aeration tube 43 through the air injection tube 42 and the transfer tube 41, and then the air is injected into the treatment tank 2 by the aeration tube 43 to promote the sewage treatment process.

[0055] Reference Figure 2-Figure 5 The flushing mechanism includes a freely rotatable rotating rod 9 mounted on a base at the top of the sewage tank 1. Two second rubber wheels 10 are fixedly mounted on the outer wall of the rotating rod 9. These second rubber wheels 10 contact the sides of two hollow rotating disks 5, respectively. When the rotating rod 9 rotates, friction drives the hollow rotating disks 5 to rotate. Two first rubber wheels 7 are fixedly mounted on the outer wall of each membrane filter tube 6. Adjacent first rubber wheels 7 on the same side touch each other and are connected by a transmission mechanism, allowing them to rotate synchronously. A curved plate 8 is fixed to the inner wall of the treatment tank 2. This curved plate 8 contacts the first rubber wheels 7, causing friction to drive the first rubber wheels 7 to rotate, thereby rotating the entire membrane filter tube 6. A first water pump 12 is fixed to one side of the sewage tank 1 via a frame. The liquid inlet of the first water pump 12 is connected to the fixed pipe 3 via a hose. One end of the fixed pipe 3 penetrates the inner wall of the sewage tank 1 and extends into the interior of the sewage tank 1. At the bottom of the fixed pipe 3, a first three-way valve 11 is connected through a hose. One port of the first three-way valve 11 is connected to a first water pump 12 for extracting water treated by the membrane filter tube 6; the other port is connected to a first water inlet pipe 13, which is connected to an external water source.

[0056] Specifically, when flushing is required, clean water is injected into the fixed tube 3 through the first water inlet pipe 13, and the clean water enters the hollow rotating disk 5 through the through hole 4 on the fixed tube 3, and then flows into the membrane filter tube 6, thereby flushing the inside of the membrane filter tube 6.

[0057] Reference Figure 2-Figure 5 To further flush the outer wall of the membrane filter tube 6, the flushing structure also includes two closed blocks 22 fixed within the fixed tube 3. A reciprocating threaded rod 23 is rotatably connected between the two closed blocks 22. A nut block 24 is threadedly sleeved on the outer wall of the reciprocating threaded rod 23, which slides into the rectangular groove at the top of the fixed tube 3 via a connecting block. A liquid storage ring 25 is also slidably sleeved on the outer wall of the fixed tube 3, the top of which is fixedly connected to the connecting block. Multiple nozzles 26 are fixed to the outer wall of the liquid storage ring 25 for spraying clean water. Power and water supply system: One end of the reciprocating threaded rod 23 rotates through one of the closed blocks 22 and extends to the outside of the fixed tube 3. It is connected to the rotating rod 9 via a synchronous pulley and synchronous belt transmission, achieving synchronous rotation. A third water pump 27 is fixed to the other side of the sewage tank 1 through the frame. The liquid inlet of the third water pump 27 is connected to the external water source via a hose, and the liquid outlet is connected to the liquid storage ring 25 via a second water inlet pipe 28.

[0058] Specifically, when the third water pump 27 is activated, clean water is injected into the liquid storage ring 25 and sprayed outward through the nozzles 26. Simultaneously, the rotation of the rotating rod 9 drives the reciprocating threaded rod 23 through synchronous transmission. This, in turn, through the cooperation of the nut block 24 and the connecting block, causes the liquid storage ring 25 to reciprocate linearly on the fixed tube 3. In this way, the multiple nozzles 26 can comprehensively flush the outer wall of the rotating membrane filter tube 6.

[0059] Reference Figure 7-Figure 9 The injection structure includes two injection tubes 30 fixed to the bottom of the medicine storage tank 50. These two injection tubes 30 are respectively connected to the multiple membrane filter tubes 6 in the two treatment tanks 2. The bottom ends of the injection tubes 30 are connected to the fixed tube 3, and the cleaning agent is injected into the hollow rotating disk 5 through the through hole 4. Two rotating plates 31 are also rotatably connected to the bottom of the medicine storage tank 50 via a rotating shaft to seal the injection tubes 30. Each rotating plate 31 is provided with a first clearance groove 32, in which a first pin 33 slidably engages. A U-shaped bracket 34 is fixed at each end of the first pin 33. The bottom of the U-shaped bracket 34 is connected to the inner wall of the bottom of the medicine storage tank 50 by two tie rods 35 that slide through the bottom wall of the medicine storage tank 50. A push plate 36 is fixed to the bottom end of the tie rod 35. The push plate 36 cooperates with the centrifugal structure at the bottom of the medicine storage tank 50, such as the rotating disk 37, centrifugal weight 39, and tension spring 40.

[0060] Specifically, when the rotating rod 9 rotates, the rotating disk 37 is driven to rotate through the transmission mechanism. The centrifugal weight 39 moves outward under the action of centrifugal force, and the tension spring 40 is stretched. The centrifugal weight 39 drives the push plate 36 and the pull rod 35 downward through the connecting mechanism. The pull rod 35 drives the rotating plate 31 to rotate through the cooperation of the first pin 33 and the first clearance groove 32, thereby releasing the blockage of the injection tube 30. At this time, the output shaft of the multi-stage cylinder 51 pushes the sealing plate 29 downward, quickly injecting the cleaning agent into the fixed tube 3, and then enters the hollow rotating disk 5 through the through hole 4, and finally enters the membrane filter tube 6. Due to the rotation of the membrane filter tube 6, the cleaning agent can be evenly distributed in the membrane filter tube 6, comprehensively and effectively removing dirt.

[0061] Reference Figure 7-Figure 9 The specific design of the centrifugal structure is as follows: a turntable 37 is installed under the medicine storage box 50, and the turntable 37 is rotated by bearings and other structures. One side edge of the turntable 37 is processed with multiple sliding grooves 38 distributed at equal intervals, and a centrifugal block 39 is slidably installed in each sliding groove 38. One end of the centrifugal block 39 is designed as an inclined surface, which cooperates with the bottom surface of the push plate 36 and is used to push the push plate 36 to move under the action of centrifugal force. A tension spring 40 is fixedly connected to the other side of the centrifugal block 39, and the other end of the tension spring 40 is fixedly connected to the side wall of the sliding groove 38, which is used to pull the centrifugal block 39 back to its initial position when the turntable 37 stops rotating. The central axis of the turntable 37 is fixedly connected to one end of a rotating rod 9 to ensure that when the rotating rod 9 rotates under the drive of the motor or other driving device, it can synchronously drive the turntable 37 to rotate.

[0062] Specifically, when the rotating rod 9 rotates, the rotating disk 37 rotates accordingly, generating centrifugal force that causes the centrifugal weight 39 to slide outward, stretching the tension spring 40. The inclined surface of the centrifugal weight 39 pushes the push plate 36 downward. This, in turn, through the sliding engagement of the pull rod 35 and the first pin 33 within the first clearance groove 32, drives the rotating plate 31 to rotate about its fixed axis, thereby releasing the sealing state of the rotating plate 31 on the injection tube 30 and allowing the drug to enter the treatment tank 2 through the injection tube 30.

[0063] Reference Figure 10 In order to achieve effective sewage treatment and reuse in a municipal sewage treatment plant, this embodiment uses a second water pump 19 fixedly mounted on a frame on the side of the sewage tank 1 away from the three-way pipe 15. The liquid inlet of the second water pump 19 is connected to a second three-way valve 20. The two liquid inlet ports of the second three-way valve 20 are connected to the two treatment tanks 2 via hoses, respectively, for selectively extracting sewage from either treatment tank 2. The liquid outlet of the second water pump 19 is connected to a third three-way valve 21. The two liquid outlet ports of the third three-way valve 21 are also connected to the two treatment tanks 2 via hoses, for discharging the extracted sewage into the other treatment tank 2, achieving recycling treatment and reuse of the sewage.

[0064] Reference Figure 6 To ensure the stability of the closing plate 16 within the treatment tank 2, a magnetic stopper 18 is fixedly mounted on the inner wall of each treatment tank 2. Furthermore, a layer of iron sheet is fixed to each side of the closing plate 16. When the closing plate 16 is lowered to the bottom of the treatment tank 2, a magnetic attraction is generated between the magnetic stopper 18 and the iron sheet, effectively preventing the closing plate 16 from shaking or shifting under the impact of the water flow.

[0065] Example 2: Reference Figure 10 and Figure 11 , an improvement based on Example 1: In each treatment tank 2, this embodiment further provides a set of driving structures for driving the rotation of multiple aeration tubes 43 in the treatment tank 2. Specifically, a gear 45 is fixedly provided on the outer wall of one of the aeration tubes 43, and the multiple aeration tubes 43 are connected by a synchronous wheel and a synchronous belt or a sprocket chain (and the stability of the transmission can be ensured by a tensioning wheel). A push rod 47 slides through the sewage tank 1, and the bottom end of the push rod 47 is fixedly connected to a rack 46 that meshes with the gear 45. A second pin rod 49 is fixedly passed through the top of the push rod 47, and the two ends of the second pin rod 49 respectively extend into the second clearance groove 48 on the two rotating plates 31, and slide in conjunction with the second clearance groove 48.

[0066] When the second water pump 19 pumps wastewater from one treatment tank 2 to the other, the rotating rod 9 rotates rapidly, driving the rotating plate 31 through the centrifugal mechanism to rotate and release the blockage on the injection tube 30. Simultaneously, the rotating plate 31, through the engagement of the second clearance slot 48 and the second pin 49, drives the push rod 47 and the rack 46 upward. The meshing action of the rack 46 and the gear 45 causes one of the aeration tubes 43 to begin rotating. Through the transmission of the synchronous wheel and the synchronous belt, all aeration tubes 43 rotate synchronously by approximately 180°. At this point, the curved baffle 44 mounted on the aeration tube 43 rotates to the aeration hole, sealing it and preventing dirt from entering and clogging the aeration hole as the water level drops during the sewage extraction process. When the water level in the treatment tank 2 drops below the curved baffle 44, the rotation of the rotating rod 9 slows, and the membrane filter tube 6 begins to flush, ensuring that the membrane filter tube 6 is clean and unobstructed. In summary, the present invention realizes the deep treatment of sewage in the urban sewage treatment plant and the automatic cleaning of the membrane filter tube 6 through the sophisticated structural design, thereby improving the sewage treatment efficiency and the stability of the equipment operation.

[0067] The method for using the MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant includes the following steps:

[0068] S1. During sewage treatment, the precipitated sewage is injected into one of the treatment tanks 2 through the three-way pipe 15. The sewage is filtered through the membrane filter tube 6 and then enters the hollow rotating disk 5. Then, the first water pump 12 and the first three-way valve 11 cooperate to pump the treated sewage in the hollow rotating disk 5 to the outside. During sewage treatment, air is injected into the aeration pipe 43 through the blower, the air injection pipe 42 and the transfer pipe 41. Air is then injected into the treatment tank 2 through the aeration pipe 43 for sewage treatment.

[0069] S2. When the membrane filter tube 6 needs to be cleaned, the treatment pool 2 in use needs to be closed, and another treatment pool 2 needs to be opened. Then, the remaining sewage in the treatment pool 2 is pumped into the other treatment pool 2. Specifically, the rotating rod 9 above the cleaning membrane filter tube 6 is driven by a motor. The rotating rod 9 drives the hollow rotating disk 5 and the membrane filter tube 6 to rotate through the friction between the second rubber wheel 10 and the hollow rotating disk 5. The hollow rotating disk 5 drives the push plate 14 to rotate. The push plate 14 cooperates with the inclined surface of the trapezoidal block 17 to drive the trapezoidal block 17 and the closing plate 16 to move. The tee pipe 15 is moved, and the closing plate 16 is just able to block one liquid inlet end of the tee pipe 15. The magnetic stopper 18 and the closing plate 16 generate a magnetic attraction force to ensure the stability of the closing plate 16 blocking one end of the magnetic stopper 18. In addition, the second water pump 19 cooperates with the second three-way valve 20 and the third three-way valve 21 to discharge the sewage in the previously used treatment tank 2 into the treatment tank 2 in use, thereby ensuring the normal operation of the sewage treatment when the membrane filter tube 6 is cleaned in the later stage, and discharging the sewage in the corresponding treatment tank 2, which is convenient for cleaning the membrane filter tube 6 in the later stage.

[0070] S3. When cleaning, first inject the corresponding cleaning agent into the membrane filter tube 6 to remove the dirt attached to the outer wall of the membrane filter tube 6; in specific operation, the rotating rod 9 drives the turntable 37 to rotate when rotating, and the centrifugal block 39 moves outward under the action of centrifugal force, and the tension spring 40 is stretched, and the centrifugal block 39 drives the push plate 36 and the pull rod 35 to move downward, and the pull rod 35 drives the rotating plate 31 to rotate through the cooperation of the first pin 33 and the first give way groove 32, and releases the blocking of the rotating plate 31 on the injection tube 30, and the output shaft of the multi-stage cylinder 51 pushes the sealing plate 29 to move downward. The cleaning agent is quickly injected into the fixed tube 3 through the injection tube 30, and enters the corresponding hollow rotating disk 5 through the through hole 4, and then enters the membrane filter tube 6 through the hollow rotating disk 5. Since the second rubber wheel 10 drives the hollow rotating disk 5 to rotate, the hollow rotating disk 5 drives the multiple membrane filter tubes 6 to rotate, and the adjacent two membrane filter tubes 6 are connected by the first rubber wheel 7. Therefore, under the action of the curved plate 8, the multiple membrane filter tubes 6 can be driven to rotate. At this time, the cleaning agent in the membrane filter tube 6 can be evenly distributed in the membrane filter tube 6, and the dirt is comprehensively and effectively removed.

[0071] S4, after the cleaning agent is removed, the rotating rod 9 starts to rotate slowly, the injection tube 30 is closed again, and clean water is injected into the hollow rotating disk 5 and the membrane filter tube 6 for flushing to avoid residual cleaning agent in the hollow rotating disk 5 and the membrane filter tube 6; in specific operation, the rotating rod 9 rotates slowly, the centrifugal force of the centrifugal block 39 becomes smaller, and the centrifugal block 39 moves to the middle under the tension of the tension spring 40, and the rotating plate 31 rotates in the opposite direction to reset and close the injection tube 30 again, and clean water is injected into the fixed pipe 3 through the cooperation of the first water inlet pipe 13 and the first three-way valve 11, and the clean water is passed through the fixed pipe 3. After being injected into the corresponding hollow rotating disk 5 through the through hole 4, it enters the membrane filter tube 6, thereby flushing the interior of the membrane filter tube 6. At the same time, the third water pump 27 cooperates with the second water inlet pipe 28 to inject clean water into the liquid storage ring 25, and the clean water is sprayed outward through the nozzle 26. The reciprocating threaded rod 23 drives the liquid storage ring 25 to move back and forth linearly through the nut block 24. Multiple nozzles 26 flush the outer wall of the rotating membrane filter tube 6. The combination of inside and outside can fully complete the flushing operation of the membrane filter tube 6, thereby avoiding residual cleaning agents in the membrane filter tube 6 and affecting the later sewage treatment effect;

[0072] S5. When cleaning the membrane filter tube 6 in the corresponding treatment tank 2, it is necessary to protect the aeration tube 43 inside it to prevent the dirt in the treatment tank 2 from clogging the aeration holes. In specific operation, when the second water pump 19 pumps the sewage inside one of the treatment tanks 2 into the other treatment tank 2, the rotating rod 9 rotates quickly to drive the rotating plate 31 to rotate and release the blockage of the injection tube 30. At this time, the rotating plate 31 drives the rack 46 to move upward through the cooperation of the second give way groove 48 and the second pin rod 49. The rack 46 drives one of the aeration tubes 43 to rotate through the gear 45, and multiple aeration tubes 43 are connected by synchronous wheels and synchronous belts. Therefore, the aeration tube 43 rotates 180°, and the arc-shaped baffle 44 closes the aeration holes of the aeration tube 43 to prevent dirt from clogging the aeration holes as the water level drops during the sewage extraction process. When the water level is lower than the arc-shaped baffle 44, the rotating rod 9 rotates slowly to flush the membrane filter tube 6.

[0073] However, as is well known to those skilled in the art, the working principles and wiring methods of the second water pump 19, the first water pump 12 and the third water pump 27 are commonplace, and are conventional means or common knowledge, so they will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0074] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. MBR membrane bioreactor for deep sewage treatment in urban sewage treatment plants, characterized by: The invention comprises a sewage pool (1), wherein two treatment pools (2) are provided in the sewage pool (1), a fixed pipe (3) is fixed in each of the two treatment pools (2), two hollow rotating disks (5) are rotatably sleeved on the outer walls of the two fixed pipes (3), a plurality of membrane filter tubes (6) are rotatably connected between the two hollow rotating disks (5) located in the same treatment pool (2), and the two treatment pools (2) and the plurality of membrane filter tubes (6) cooperate to alternately complete sewage treatment; The outer wall of the fixed tube (3) is provided with a plurality of through holes (4), and the hollow rotating disk (5) is connected to the fixed tube (3) through the plurality of through holes (4); It also includes a medicine storage box (50) fixed on the top of the sewage tank (1), a multi-stage cylinder (51) fixed on the top of the medicine storage box (50), an output shaft of the multi-stage cylinder (51) extending into the medicine storage box (50) and fixed with a sealing plate (29), and the sealing plate (29) slidingly sealingly inside the medicine storage box (50) for injecting cleaning agents into the multiple membrane filter tubes (6) in the two treatment tanks (2); It also includes a three-way pipe (15) fixed on one side of the sewage tank (1), and the liquid inlet end of the three-way pipe (15) is connected to the external sewage sedimentation tank, and the two liquid outlet ends of the three-way pipe (15) are respectively connected to the two treatment tanks (2), and the inner wall of one side of the two treatment tanks (2) is slidably connected to the same closing plate (16) for alternately blocking the two liquid outlet ends of the three-way pipe (15); Wherein, a transfer pipe (41) is fixed to the inner wall of each of the two treatment pools (2) on a side away from each other, for injecting air into the treatment pools (2); A control structure, provided on one side of the closing plate (16), for controlling the movement of the closing plate (16); an aeration structure, disposed in the treatment tank (2) and used for injecting air into the treatment tank (2); A drug injection structure is provided in the drug storage box (50) and is used to inject a cleaning agent into the membrane filter tube (6) to remove dirt attached to the outer wall of the membrane filter tube (6); A flushing structure is provided in the treatment tank (2) and is used to clean residual cleaning agents on the membrane filter tube (6); The flushing structure comprises a rotating rod (9) that rotates on the top of the sewage pool (1) through a base, the outer wall of the rotating rod (9) is fixedly sleeved with two second rubber wheels (10), and the two second rubber wheels (10) respectively cooperate with the two hollow rotating disks (5) to drive the hollow rotating disks (5) to rotate, the outer walls of the plurality of membrane filter tubes (6) are fixedly sleeved with two first rubber wheels (7), and the two adjacent first rubber wheels (7) located on the same side touch each other to achieve transmission connection, and the inner wall of the side away from each other of the treatment pool (2) is fixed with an arc plate (8), and the arc plate (8) touches the first rubber wheel (7), and the friction between the arc plate (8) and the first rubber wheel (7) The force drives the first rubber wheel (7) to rotate, a first water pump (12) is fixed to one side of the sewage tank (1) through a frame, one end of the fixed pipe (3) is fixedly passed through the inner wall of one side of the sewage tank (1) and extends to one side of the sewage tank (1), a first three-way valve (11) is fixed to the bottom of the fixed pipe (3) through a hose, one port of the first three-way valve (11) is connected to the first water pump (12) and is used to extract water treated by the membrane filter tube (6), and a first water inlet pipe (13) is fixed to the other port of the first three-way valve (11), and the first water inlet pipe (13) is connected to an external water source and is used to inject clean water into the hollow rotating disk (5) and the membrane filter tube (6); The flushing structure also includes two closing blocks (22) fixed in the fixed tube (3), a reciprocating threaded rod (23) is rotatably connected between the two closing blocks (22), a nut block (24) is provided on the outer wall thread sleeve of the reciprocating threaded rod (23), a rectangular groove is provided on the top of the fixed tube (3), a connecting block fixedly connected to the nut block (24) is slidably connected in the rectangular groove, a liquid storage ring (25) is provided on the outer wall sliding sleeve of the fixed tube (3), the top of the connecting block is fixedly connected to the inner wall of the top of the liquid storage ring (25), and a plurality of nozzles (26) are fixed on the outer wall of the liquid storage ring (25) for flushing the outer wall of the rotating middle membrane filter tube (6) One end of the reciprocating threaded rod (23) rotates through one of the closing blocks (22) and extends to one side of the fixed pipe (3). The reciprocating threaded rod (23) and the rotating rod (9) are connected by a synchronous wheel and a synchronous belt transmission, and are used to drive the liquid storage ring (25) to move back and forth. A third water pump (27) is fixed to one side of the sewage tank (1) through a frame. The liquid inlet of the third water pump (27) is connected to the external water source through a hose. The liquid outlet of the third water pump (27) is fixed with a second water inlet pipe (28). The second water inlet pipe (28) is fixed through the closing block (22) and is connected to the liquid storage ring (25) to provide clean water to the nozzle (26).

2. The MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant according to claim 1, characterized in that: The control structure comprises two trapezoidal blocks (17) fixed on one side of the closing plate (16), and the two trapezoidal blocks (17) are respectively located in the two treatment tanks (2). A plurality of push plates (14) are fixed on one side of the two hollow rotating disks (5) adjacent to each other, and the trapezoidal blocks (17) cooperate with adjacent push plates (14).

3. The MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant according to claim 1, characterized in that: The aeration structure comprises a plurality of aeration tubes (43) rotatably mounted on the inner wall of one side of the treatment tank (2), one end of each of the plurality of aeration tubes (43) being rotatably connected to the transfer tube (41), and the aeration tubes (43) being communicated with the transfer tube (41), an air injection tube (42) being fixedly mounted on one side of the transfer tube (41), one end of the air injection tube (42) being fixedly extended to one side of the sewage tank (1) and being communicated with an external blower, a plurality of arc-shaped baffles (44) being fixedly mounted on the inner wall of the bottom of the treatment tank (2) via pillars, and the aeration tubes (43) being rotatably mounted in the arc-shaped baffles (44) for supporting the aeration tubes (43).

4. The MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant according to claim 1, characterized in that: The injection structure comprises two injection tubes (30) fixed at the bottom of the medicine storage box (50), and the two injection tubes (30) are respectively used to provide cleaning agents to multiple membrane filter tubes (6) in the two treatment pools (2). The bottom ends of the injection tubes (30) are connected to the fixed tube (3). The injection tubes (30) cooperate with the through holes (4) to inject cleaning agents into the corresponding hollow rotating disks (5). The bottom inner wall of the medicine storage box (50) is connected to two rotating plates (31) through a rotating shaft. The two rotating plates (31) are respectively used to block the two injection tubes (30). Both of the rotating plates (31) are provided with a first clearance groove. (32), the two first yielding grooves (32) are both slidably fitted with a first pin rod (33), and the two ends of the first pin rod (33) are fixed with the same U-shaped frame (34), and the bottom inner wall of the medicine storage box (50) is sealed and slidably penetrated by two pull rods (35), and the top ends of the two pull rods (35) are respectively fixedly connected to the bottom of the corresponding U-shaped frame (34), and the bottom ends of the two pull rods (35) are both fixed with a push plate (36), and the bottom of the medicine storage box (50) is provided with two centrifugal structures, and the push plate (36) cooperates with the centrifugal structure to drive the rotating plate (31) to rotate to complete the opening and closing of the injection tube (30).

5. The MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant according to claim 4, characterized in that: The centrifugal structure includes a turntable (37) rotating below the medicine storage box (50), a plurality of sliding grooves (38) are provided on one side of the turntable (37), a plurality of centrifugal blocks (39) are slidably connected in the plurality of sliding grooves (38), and the centrifugal blocks (39) cooperate with the push plate (36) to drive the push plate (36) to move, a tension spring (40) is fixed on one side of the plurality of centrifugal blocks (39), and the ends of the plurality of tension springs (40) close to each other are fixedly connected to the inner wall of one side of the corresponding sliding groove (38), and the other side of the turntable (37) is fixedly connected to one end of the adjacent rotating rod (9).

6. The MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant according to claim 5, characterized in that: A second water pump (19) is fixed to a side of the sewage tank (1) away from the three-way pipe (15) through a frame, a second three-way valve (20) is fixed to the liquid inlet end of the second water pump (19), and both liquid inlet ports of the second three-way valve (20) are connected to the two treatment tanks (2) through a hose, and a third three-way valve (21) is fixed to the liquid outlet end of the second water pump (19), and both liquid outlet ports of the third three-way valve (21) are connected to the two treatment tanks (2) through a hose.

7. The MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant according to claim 6, characterized in that: A magnetic stopper (18) is fixed to the inner wall of one side of the two treatment pools (2), and iron sheets are fixed to both sides of the closing plate (16), and a magnetic attraction force is generated between the magnetic stopper (18) and the iron sheets to control the stability of the closing plate (16).

8. The MBR membrane bioreactor for deep sewage treatment in a municipal sewage treatment plant according to claim 7, characterized in that: A driving structure is provided in each of the two treatment tanks (2), and the driving structure is used to drive the rotation of the plurality of aeration pipes (43) in the treatment tank (2); The driving structure includes a gear (45) rotating in the treatment tank (2), and the gear (45) is fixedly sleeved on the outer wall of one of the aeration tubes (43). The outer walls of the plurality of aeration tubes (43) are connected by synchronous wheels and synchronous belt transmission. A push rod (47) is slidably passed through the sewage tank (1). A rack (46) is fixed to the bottom end of the push rod (47), and the rack (46) is meshed with the gear (45) for driving the aeration tube (43) to rotate. A second pin rod (49) is fixedly passed through the top end of the push rod (47). The inner walls of the two rotating plates (31) on the side away from each other are both provided with a second clearance groove (48). The two ends of the second pin rod (49) respectively extend into the two second clearance grooves (48), and the second pin rod (49) is slidably matched with the second clearance groove (48).

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