A filtering device for multiplying biomass in a biochemical pool and its application

Abstract

The present application relates to the field of separation technology, and in particular to a filtration device for multiplying the biomass of a biochemical pool and its application. The filtration device includes a body, a filtration retention chamber and an automatic aeration control chamber respectively arranged inside the body, a first water inlet pipe, a second water inlet pipe and a water outlet arranged on the side of the body, an aeration control component, an air source component, an aeration head, and a compressed air delivery pipe connected to the aeration control component and the aeration head; the upper part of the partition plate between the automatic aeration control chamber and the filtration retention chamber is connected, the first water inlet pipe and the second water inlet pipe are located at the upper part of the body and not lower than the upper end of the partition plate, and the water outlet is located at the upper part of the other side of the body. The filtration device of the present application is used to multiply the biomass of a biochemical pool, can increase the sludge concentration in the biochemical pool, and increase the sewage treatment efficiency in the biochemical treatment pool. It uses a hydraulically driven control valve, which is simple to control and does not require liquid level detection / sludge permeability detection and electric control valve combined control.

Description

Technical Field

[0001] The present application relates to the field of separation technology, and in particular to a filtering device for multiplying biomass in a biochemical pool and its application. Background Art

[0002] Biochemical wastewater treatment typically involves two methods: activated sludge and biofilm. The activated sludge method relies on microbial aggregates (biomass) to treat organic matter in wastewater. The amount of pollutants removed from a sewage treatment tank is positively correlated with the biomass. Traditional activated sludge methods typically have a biomass of ≤4,000 mg / L. Increasing the biomass to 8,000 mg / L would double the pollutant removal capacity per unit tank volume, significantly reducing the tank's capacity. However, when the biomass is between 6,000 and 8,000 mg / L, sludge and water separation becomes difficult (the separation rate decreases with increasing sludge concentration), necessitating the construction of larger sedimentation tanks.

[0003] There are currently three core bio-multiplication processes: 1) doubling biomass by adding biological fillers to the biochemical tank; 2) doubling biomass through sludge granulation (aerobic granular sludge technology); and 3) doubling biomass by installing MBR membranes within the biochemical tank to intercept activated sludge. However, all three of these processes have drawbacks: 1) bio-fillers can only achieve a biomass enrichment of 5 kg / (m³*d), and polyurethane fillers are prone to wear (requiring regular replacement and high maintenance costs) and clogging (the three-dimensional mesh makes recovery difficult). 2) Aerobic granular sludge technology can achieve a biomass of 10 kg / (m³*d), but it has high environmental requirements (such as nutrients) and is characterized by process instability. 3) installing MBR membranes within the biochemical tank for sludge-water separation has a number of drawbacks, including high initial investment costs and high maintenance costs (membrane replacement costs and electricity costs). Summary of the Invention

[0004] Aiming at the continuous flow biochemical sewage treatment process, the present invention provides a filtering device for doubling the biomass of the biochemical pool and its application. By adding a filtering device between the biochemical pool and the sedimentation tank, the mud-water mixture going to the sedimentation tank is filtered and intercepted, thereby achieving the purpose of doubling the biomass of the biochemical pool and reducing the sludge concentration of the mud-water mixture going to the sedimentation tank.

[0005] The following technical solutions are adopted:

[0006] A filtration device for multiplying biomass in a biochemical pond comprises a body, a filtration and retention chamber and an automatic aeration control chamber respectively disposed within the body, a first water inlet pipe disposed on the side of the body and communicating with the filtration and retention chamber, a second water inlet pipe disposed on the side of the body and communicating with the automatic aeration control chamber, an aeration control assembly disposed within the automatic aeration control chamber, an air source assembly for providing compressed air to the aeration control assembly, an aeration head disposed at the bottom of the filtration and retention chamber, a compressed air delivery pipe connected between the aeration control assembly and the aeration head, and a water outlet disposed on the side of the body.

[0007] The first water inlet pipe and the second water inlet pipe are located on the same side of the body, and the water outlet is located on the other side of the body opposite to the first water inlet pipe;

[0008] The upper part of the partition plate between the automatic aeration control chamber and the filtration retention chamber is connected, the first water inlet pipe and the second water inlet pipe are located on the upper part of the body and not lower than the upper end of the partition plate, and the water outlet is located on the upper part of the other side of the body.

[0009] With the above technical solution, the filter and interception chamber is used to filter and intercept the mud-water mixture, and the automatic aeration control chamber automatically controls aeration to disperse the sludge layer intercepted in the filter and interception chamber.

[0010] Optionally, an inclined plate is fixedly provided on the upper portion of the filtration retention chamber, a fiber filler is fixedly filled in the middle portion of the filtration retention chamber, and a water collection area is formed at the lower portion of the filtration retention chamber above the aeration head and below the fiber filler.

[0011] With the above technical solution, the role of the inclined plate is to smooth the impact of sewage entering the filter retention chamber, slow down water flow fluctuations, and prevent the fiber filler from passing through the sewage too quickly, resulting in poor filtration effect.

[0012] Optionally, the water collection area is provided with a water collection pipe, which is connected to the water outlet; and a filter head located in the water collection area is fixedly installed on the water collection pipe.

[0013] By adopting the above technical solution, the water in the water collection area is filtered by the filter head and then enters the water collection pipe, and is discharged to the next sewage treatment process through the outlet.

[0014] Optionally, the aeration control assembly includes a float and a compressed air control valve;

[0015] A pedestal is fixedly provided on the side wall of the automatic aeration control chamber, and the lower end surface of the float is placed on the pedestal;

[0016] The compressed air control valve is connected between the air source assembly and the compressed air delivery pipe;

[0017] The compressed air control valve is located just above the float.

[0018] By adopting the above technical solution, when the sewage level in the automatic aeration control room is high, the float pushes open the compressed air control valve above due to buoyancy, the compressed air control valve opens, and the compressed air from the air source assembly enters the compressed air delivery pipe, and the compressed air rushes out from the aeration head connected to the compressed air delivery pipe.

[0019] Optionally, the compressed air control valve includes a compressed air control valve housing, an air inlet and an air outlet respectively provided on the compressed air control valve housing, a limit baffle fixed inside the compressed air control valve housing, a sliding rod fixedly connected to the limit baffle, a valve plate slidably connected to the sliding rod, a push rod whose upper end is fixedly connected to the middle of the lower surface of the valve plate, and a seat plate fixedly connected to the lower end of the push rod;

[0020] The air inlet of the compressed air control valve is connected to the air source component, and the air outlet of the compressed air control valve is connected to the compressed air delivery pipe.

[0021] With the above technical solution, when the push rod moves upward, it pushes the valve plate and slides upward along the slide rod, and the valve plate moves away from the limit baffle. At this time, the compressed air control valve is in the open state.

[0022] Optionally, the lower end of the push rod passes through the valve housing of the compressed air control valve, and a spring is mounted on the push rod, and the spring is located inside the valve housing of the compressed air control valve.

[0023] With the above technical solution, when the push rod is not subjected to upward force, the gravity of the valve plate and the push rod and the elastic restoring force of the spring reset the valve plate and close it on the limit baffle. At this time, the compressed air control valve is in a closed state.

[0024] Optionally, a top end of the float is fixedly connected to a top end, and the top end is located directly below the seat plate.

[0025] With the above technical solution, when the float is lifted to a certain height by the buoyancy, the top of the float generates a thrust on the seat plate to open the valve plate.

[0026] Optionally, the aeration control assembly further includes a connecting pipe and a backwash control valve;

[0027] The lower end of the connecting pipe is connected to the water collection area, and the backwash control valve is sleeved on the upper end of the connecting pipe;

[0028] Water holes are provided on both sides of the backwash control valve;

[0029] The backwash control valve is located below the float, and the upper end surface of the backwash control valve is connected to the lower end surface of the float through a pull rope.

[0030] By adopting the above technical solution, when the liquid level is high, the float pushes open the compressed air control valve under the action of buoyancy, and at the same time, pulls the backwash control valve upward. The sewage in the biochemical pool enters the water collection area through the backwash control valve, part of which flows from the water outlet to the sedimentation tank through the water collection pipe, and part returns to the biochemical pool from the first water inlet pipe with aeration.

[0031] Optionally, the air source assembly includes an air storage tank and an air compressor, the compressed air outlet of the air compressor is connected to the air storage tank, and the compressed air delivery pipe is connected to the air storage tank.

[0032] By adopting the above technical solution, the compressed air generated by the air compressor is stored in the air storage tank, and the compressed air in the air storage tank is transmitted to the aeration head for aeration through the compressed air delivery pipe.

[0033] Optionally, the filtering device described above is applied between the biochemical tank and the sedimentation tank of the sewage biochemical treatment system.

[0034] By adopting the above technical solution, the filtering device can increase the sludge concentration in the biochemical pool, thereby accelerating the sewage treatment efficiency in the biochemical pool.

[0035] In summary, this application includes at least one of the following beneficial technical effects:

[0036] The present application provides a filtration device for multiplying the biomass of a biochemical pond and its application. The filtration device is cleverly designed so that the device operates automatically under the drive of buoyancy. It does not require any electrical equipment and is a purely mechanical structure. It has the characteristics of simple structure, stable operation, and low investment cost. Compared with the MBR biological multiplication process, the investment cost of the process described in the present invention can be saved by 80%, and the operation and maintenance cost can be saved by 95%; compared with the process of adding biological fillers, the process described in the present invention can be saved by 90%, and the operation and maintenance cost can be saved by 95%. The filtration device is used to multiply the biomass of a biochemical pond, which can increase the sludge concentration in the biochemical pond and increase the sewage treatment efficiency in the biochemical treatment water tank. Correspondingly, it can reduce the design volume of the biochemical pond and reduce the investment cost of the biochemical pond construction. The sludge concentration entering the sedimentation tank is reduced, and the design volume of the sedimentation tank is correspondingly reduced to reduce the cost of the sedimentation tank construction investment. The use of a hydraulically driven control valve is simple to control and does not require liquid level detection / sludge permeability detection and electric control valve combined control. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the top view of the filtering device of the present application;

[0038] Figure 2 yes Figure 1 A-direction cross-sectional structural diagram;

[0039] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure in the direction B;

[0040] Figure 4 It is a left-side structural schematic diagram of the filtering device of the present application;

[0041] Figure 5 This is a schematic structural diagram of the compressed air control valve of the present application in a closed state;

[0042] Figure 6 This is a schematic structural diagram of the compressed air control valve of the present application in the open state;

[0043] Figure 7 This is a schematic diagram of the running trajectory of sewage in the filtration device when the backwash control valve of the present application is in the closed state;

[0044] Figure 8 This is a schematic diagram of the running trajectory of sewage in the filtration device when the backwash control valve of this application is in the open state;

[0045] Figure 9 This is a schematic diagram of the application of the filtration device between the aerobic tank and the sedimentation tank;

[0046] Figure 10 This is a schematic diagram of the application of the filtration device between the hydrolysis acidification tank and the sedimentation tank;

[0047] Figure 11 This is a schematic diagram of the application of the filtration device between the aeration tank and the sedimentation tank;

[0048] Figure 12 This is a schematic diagram of the filtration device of the present application being applied between the anoxic tank and the sedimentation tank.

[0049] In the accompanying drawings,

[0050] 1. Machine body; 2. Air storage tank; 3. Air compressor; 4. Compressed air delivery pipe; 5. Compressed air control valve; 6. Float; 7. Water outlet; 8. Inclined plate; 9. Fiber filler; 10. Aeration head; 11. Water collection area; 12. Filter head; 13. First water inlet pipe; 14. Second water inlet pipe; 15. Backwash control valve; 16. Return pipe; 17. Water collection pipe; 18. Connecting pipe; 19. Pull rope; 51. Compressed air control valve housing; 52. Air inlet; 53. Air outlet; 54. Limit baffle; 55. Sliding rod; 56. Valve plate; 57. Push rod; 58. Spring; 59. Seat plate; 61. Push head. DETAILED DESCRIPTION

[0051] The following is combined with Figure 1-12 This application is described in further detail.

[0052] like Figure 1 and 2As shown, a filtration device for multiplying biomass in a biochemical pond comprises a body 1, a filtration retention chamber and an automatic aeration control chamber respectively disposed within the body 1, a first water inlet pipe 13 disposed on the side of the body 1 and communicating with the filtration retention chamber, a second water inlet pipe 14 disposed on the side of the body 1 and communicating with the automatic aeration control chamber, an aeration control assembly disposed in the automatic aeration control chamber, an air source assembly for providing compressed air to the aeration control assembly, an aeration head 10 disposed at the bottom of the filtration retention chamber, a compressed air delivery pipe 4 connected between the aeration control assembly and the aeration head 10, and a water outlet 7 disposed on the side of the body 1;

[0053] The first water inlet pipe 13 and the second water inlet pipe 14 are located on the same side of the body 1, and the water outlet 7 is located on the other side of the body 1 opposite to the first water inlet pipe 13;

[0054] The upper portion of the partition plate between the automatic aeration control chamber and the filtration retention chamber is connected, the first water inlet pipe 13 and the second water inlet pipe 14 are located on the upper portion of the body 1 and are not lower than the upper end of the partition plate, and the water outlet 7 is located on the upper portion of the other side of the body 1.

[0055] In this embodiment, the filter and interception chamber is used to filter and intercept the mud-water mixture, and the automatic aeration control chamber automatically controls aeration to disperse the sludge layer intercepted in the filter and interception chamber.

[0056] Specifically, such as Figure 3 As shown, an inclined plate 8 is fixedly provided on the upper portion of the filtration retention chamber, a fiber filler 9 is fixedly filled in the middle portion of the filtration retention chamber, and a water collection area 11 is formed at the lower portion of the filtration retention chamber, which is located above the aeration head 10 and below the fiber filler 9.

[0057] In this embodiment, the function of the inclined plate is to smooth the impact force of sewage entering the filter retention chamber, slow down the water flow fluctuation, and prevent the fiber filler 9 from passing through the sewage too quickly, resulting in poor filtration effect. The fiber filler 9 blocks the sludge in the sewage from passing through, and most of the sludge is intercepted by the fiber filler 9. The water passes through the fiber filler 9 and enters the water collection area 11.

[0058] Specifically, such as Figure 4 As shown, the water collection area 11 is provided with a water collection pipe 17 , and the water collection pipe 17 is connected to the water outlet 7 ; the filter head 12 located in the water collection area 11 is fixedly installed on the water collection pipe 17 .

[0059] In this embodiment, the water in the water collection area 11 is filtered by the filter head 12 and then enters the water collection pipe 17, and is discharged to the next sewage treatment process through the outlet 7.

[0060] Specifically, the aeration control assembly includes a float 6 and a compressed air control valve 5;

[0061] The side wall of the automatic aeration control chamber is fixedly provided with a pedestal, and the lower end surface of the float 6 is placed on the pedestal;

[0062] The compressed air control valve 5 is connected between the air source component and the compressed air delivery pipe 4;

[0063] The compressed air control valve 5 is located directly above the float 6 .

[0064] In this embodiment, when the sewage level in the automatic aeration control chamber is high, the float 6 pushes open the compressed air control valve 5 above due to the buoyancy. The compressed air control valve 5 opens, and the compressed air of the air source assembly enters the compressed air delivery pipe 4. The compressed air rushes out from the aeration head 10 connected to the compressed air delivery pipe 4. A large amount of compressed air causes the sewage in the filter retention chamber to roll and surge like a surge, thereby breaking up the sludge layer of the fiber filler 9 and mixing it with the sludge in the upper part of the filter retention chamber to form sewage with a high sludge concentration. The sewage with a high sludge concentration is discharged back to the biochemical tank from the first water inlet pipe 13. After several times, the sludge content in the upper part of the filter retention chamber gradually becomes equivalent to the sludge content in the biochemical tank.

[0065] Specifically, such as Figure 5 and 6 As shown, the compressed air control valve 5 includes a compressed air control valve housing 51, an air inlet 52 and an air outlet 53 respectively provided on the compressed air control valve housing 51, a limit baffle 54 fixed inside the compressed air control valve housing 51, a slide rod 55 fixedly connected to the limit baffle 54, a valve plate 56 slidably connected to the slide rod 55, a push rod 57 whose upper end is fixedly connected to the middle part of the lower surface of the valve plate 56, and a seat plate 59 fixedly connected to the lower end of the push rod 57;

[0066] The air inlet 52 of the compressed air control valve 5 is connected to the air source component, and the air outlet 53 of the compressed air control valve 5 is connected to the compressed air delivery pipe 4 .

[0067] In this embodiment, Figure 6 As shown, when the push rod 57 moves upward, it pushes the valve plate 56 and slides upward along the slide rod 55, and the valve plate 56 moves away from the limit baffle 54. At this time, the compressed air control valve 5 is in the open state, and the compressed air entering the compressed air control valve 5 from the air inlet 52 can flow to the air outlet 53.

[0068] Specifically, the lower end of the push rod 57 passes through the valve housing 51 of the compressed air control valve. A spring 58 is sleeved on the push rod 57 . The spring 58 is located inside the valve housing 51 of the compressed air control valve.

[0069] In this embodiment, Figure 5As shown, when the push rod 57 is not subjected to an upward force, the gravity of the valve plate 56 and the push rod 57 and the elastic restoring force of the spring 58 reset the valve plate 56 and close it on the limit baffle 54. At this time, the compressed air control valve 5 is in a closed state and compressed air cannot pass through the compressed air control valve 5.

[0070] Specifically, a top end of the float 6 is fixedly connected to a top end thereof, and the top end 61 is located directly below the seat plate 59 .

[0071] In this embodiment, when the float 6 is lifted to a certain height by the buoyancy, the top head 61 at the upper end of the float 6 generates a thrust on the seat plate 59, and the seat plate 59 opens the valve plate 56 with the push rod 57; when the liquid level drops, the height of the float 6 also drops with the liquid level, the top head 61 at the upper end of the float 6 leaves the seat plate 59, the pushing force on the seat plate 59 disappears, and the valve plate 56 falls back and closes.

[0072] Specifically, the aeration control assembly further includes a connecting pipe 18 and a backwash control valve 15;

[0073] The lower end of the connecting pipe 18 is connected to the water collection area 7, and the backwash control valve 15 is sleeved on the upper end of the connecting pipe 18;

[0074] Water holes are provided on both sides of the backwash control valve 15;

[0075] The backwash control valve 15 is located below the float 6 , and the upper end surface of the backwash control valve 15 is connected to the lower end surface of the float 6 via a pull rope 19 .

[0076] In this embodiment, Figure 8 As shown, when the liquid level is high, the float 6, under the action of buoyancy, pushes open the compressed air control valve 5, and the air inlet 525 is connected with the air outlet 53. At the same time, the float 6 pushes open the compressed air control valve 5 and pulls the backwash control valve 15 to move upward. The sewage in the biochemical pool enters the connecting pipe 18 from the water holes on both sides of the backwash control valve 15, and then enters the water collection area 11 from the connecting pipe 18. Part of it flows from the water outlet 7 to the sedimentation tank through the water collection pipe 17, and part of it returns to the biochemical pool from the first water inlet pipe 13 with aeration.

[0077] like Figure 7 As shown, when the liquid level in the biochemical tank drops to the set low level, the compressed air control valve 5 closes, and the backwash control valve 15 closes due to its own weight and the elastic force of spring 58. The sewage once again enters the filtration and interception chamber through the first water inlet pipe 13. After the sludge is intercepted by the fiber filler 99, the sewage flows through the outlet pipe 7 to the sedimentation tank. Furthermore, a return pipe 16 is provided at the bottom of the automatic aeration control chamber, located on the same side as the second water inlet pipe 14. Return pipe 16 prevents sludge from accumulating at the bottom of the automatic aeration control chamber. Water from the second water inlet pipe 14 occasionally flows into the automatic aeration control chamber, and sludge accumulated at the bottom of the aeration control chamber can flow back to the biochemical tank through return pipe 16.

[0078] Furthermore, a sludge return pump is provided at the bottom of the sedimentation tank, which can return the sludge at the bottom of the sedimentation tank to the biochemical tank; the main function of the filtering device of the present application is to increase the sludge concentration in the biochemical tank.

[0079] Specifically, the air source assembly includes an air storage tank 2 and an air compressor 3 , the compressed air outlet of the air compressor 3 is connected to the air storage tank 2 , and the compressed air delivery pipe 4 is connected to the air storage tank 2 .

[0080] In this embodiment, in order to facilitate use and pipeline connection, the air compressor 3 and the air tank 2 can be fixedly installed on the top of the machine body 1. The compressed air generated by the air compressor 3 is stored in the air tank 2. The compressed air in the air tank 2 is transmitted to the aeration head 10 for aeration through the compressed air delivery pipe 4.

[0081] Specifically, such as Figure 9 As shown, the filtration device of the present application can be used between an aerobic tank and a sedimentation tank to increase biomass.

[0082] In this embodiment, the filtering device can increase the sludge concentration in the biochemical pool, thereby accelerating the sewage treatment efficiency in the biochemical pool.

[0083] Furthermore, the filtration device of the present application is applied to a sewage biochemical treatment system and can be flexibly applied to a variety of sewage treatment scenarios, with one device used in each sewage biochemical treatment pool. It can be placed at the rear end of the hydrolysis acidification pool, aerobic pool, facultative anaerobic pool, and anoxic pool. The activated sludge in the hydrolysis acidification pool directly enters the aerobic pool, which consumes a large amount of dissolved oxygen to be converted into aerobic activated sludge, reducing the sewage treatment efficiency of the aerobic pool and even causing the system water treatment to be substandard; adding this equipment between the hydrolysis acidification pool and the aerobic pool avoids the situation where the water quality does not meet the standards due to the activated sludge consuming a large amount of dissolved oxygen; there is also a design of adding a sedimentation tank between the hydrolysis acidification pool and the aerobic pool, but it will increase the construction cost.

[0084] Specifically, the applications of the filtration device of the present application include but are not limited to the following applications:

[0085] like Figure 10 As shown, the filtration device of the present application can be used between the hydrolysis acidification tank and the aerobic tank to increase biomass.

[0086] like Figure 11 As shown, the filtration device of the present application can be used between the facultative aerobic tank and the aerobic tank to increase biomass.

[0087] like Figure 12 As shown, the filtration device of the present application can be used between an anoxic tank and an aerobic tank to increase biomass.

[0088] The embodiments of this specific implementation method are all preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A filtration device for multiplying biomass in a biochemical pool, characterized by: The invention comprises a body (1), a filter retention chamber and an automatic aeration control chamber respectively arranged inside the body (1), a first water inlet pipe (13) arranged on the side of the body (1) and communicating with the filter retention chamber, a second water inlet pipe (14) arranged on the side of the body (1) and communicating with the automatic aeration control chamber, an aeration control component arranged in the automatic aeration control chamber, an air source component for providing compressed air to the aeration control component, an aeration head (10) arranged at the bottom of the filter retention chamber, a compressed air delivery pipe (4) connected between the aeration control component and the aeration head (10), and a water outlet (7) arranged on the side of the body (1); the first water inlet pipe (13) and the second water inlet pipe (14) are located on the same side of the body (1), and the water outlet (7) is located on the other side of the body (1) opposite to the first water inlet pipe (13); The upper portion of the partition plate between the automatic aeration control chamber and the filter retention chamber is in communication, the first water inlet pipe (13) and the second water inlet pipe (14) are located at the upper portion of the machine body (1) and are not lower than the upper end of the partition plate, and the water outlet (7) is located at the upper portion of the other side of the machine body (1); An inclined plate (8) is fixedly provided at the upper portion of the filter retention chamber, a fiber filler (9) is fixedly filled in the middle portion of the filter retention chamber, and a water collection area (11) is formed at the lower portion of the filter retention chamber, which is located above the aeration head (10) and below the fiber filler (9); The water collection area (11) is provided with a water collection pipe (17), and the water collection pipe (17) is connected to the water outlet (7); a filter head (12) located in the water collection area (11) is fixedly mounted on the water collection pipe (17); The aeration control assembly includes a float (6) and a compressed air control valve (5); a pedestal is fixedly provided on the side wall of the automatic aeration control chamber, and the lower end surface of the float (6) is placed on the pedestal; the compressed air control valve (5) is connected between the air source assembly and the compressed air delivery pipe (4); the compressed air control valve (5) is located directly above the float (6); The compressed air control valve (5) comprises a compressed air control valve housing (51), an air inlet (52) and an air outlet (53) respectively provided on the compressed air control valve housing (51), a limit baffle (54) fixed inside the compressed air control valve housing (51), a slide rod (55) fixedly connected to the limit baffle (54), a valve plate (56) slidably connected to the slide rod (55), a push rod (57) whose upper end is fixedly connected to the middle of the lower surface of the valve plate (56), and a seat plate (59) fixedly connected to the lower end of the push rod (57); the air inlet (52) of the compressed air control valve (5) is connected to the air source assembly, and the air outlet (53) of the compressed air control valve (5) is connected to the compressed air delivery pipe (4); The lower end of the push rod (57) passes through the valve housing (51) of the compressed air control valve, and a spring (58) is sleeved on the push rod (57), and the spring (58) is located inside the valve housing (51) of the compressed air control valve; The upper end of the float (6) is fixedly connected to a plug (61), and the plug (61) is located directly below the seat plate (59).

2. A filtering device for multiplying biomass in a biochemical pool according to claim 1, characterized in that: The aeration control assembly further comprises a connecting pipe (18) and a backwash control valve (15); the lower end of the connecting pipe (18) is connected to the water collection area (11), and the backwash control valve (15) is sleeved on the upper end of the connecting pipe (18); water holes are provided on both sides of the backwash control valve (15); the backwash control valve (15) is located below the float (6), and the upper end surface of the backwash control valve (15) is connected to the lower end surface of the float (6) via a pull rope (19).

3. A filtering device for multiplying biomass in a biochemical pool according to any one of claims 1 to 2, characterized in that: The air source assembly comprises an air storage tank (2) and an air compressor (3), the compressed air outlet of the air compressor (3) is connected to the air storage tank (2), and the compressed air delivery pipe (4) is connected to the air storage tank (2).

4. An application of a filtration device for multiplying biomass in a biochemical pool, characterized in that: The filtration device according to any one of claims 1 to 3 is used between a biochemical tank and a sedimentation tank in a biochemical sewage treatment system.

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