An aerobic reaction system with automatic sludge return

Abstract

The invention relates to an aerobic reaction system for automatic sludge reflow, comprising a main tank body, wherein an upflow zone, a first partition wall, a downflow zone, a second partition wall, a guide zone, a third partition wall, a sedimentation zone and a water outlet pipe are sequentially arranged in the main tank body, a water inlet pipe is arranged at the bottom of the upflow zone, an air lift device is arranged in the upflow zone, and a submerged fan is arranged at the bottom of the upflow zone or the downflow zone; the top of the second partition wall is lower than the liquid level of the main tank body, the top of the first partition wall is lower than the top of the second partition wall, the top of the third partition wall is higher than the liquid level of the main tank body, the bottoms of the first partition wall, the second partition wall and the third partition wall are all higher than the bottom surface of the main tank body, and the bottom of the first partition wall is higher than the bottom of the second partition wall, so that sewage can circulate and flow between the upflow zone and the downflow zone for treatment, the treated water body passes over the second partition wall, enters the guide zone, and then passes over the bottom of the third partition wall to enter the sedimentation zone for mud and water separation, and the separated sludge flows back from the bottom of the sedimentation zone to the upflow zone and the downflow zone.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an aerobic reaction system with automatic sludge reflow. Background Art

[0002] In view of the effluent quality requirements of the third-level standard in the current Henan Province "Water Pollutant Emission Standards for Rural Domestic Sewage Treatment Facilities" DB41 / 1820-2019, most rural domestic sewage integrated treatment equipment adopts the "aerobic tank + secondary sedimentation tank" process. This process is simple, highly automated, and has low technical requirements for operation and maintenance personnel, making it more suitable for rural domestic sewage treatment projects.

[0003] However, the "aerobic tank + secondary sedimentation tank" process mostly uses the pump lifting method for sludge return. Since the return sludge is a flocculent sediment with relatively high specific gravity and viscosity, the speed of the water pump should not be too high when using a water pump to lift the return, otherwise it will easily destroy the floccules of the activated sludge. In addition, the aeration of the aerobic tank makes the return sludge have a larger gas content, which makes the sludge pump prone to cavitation, thereby increasing the maintenance cost of the equipment. Summary of the invention

[0004] In view of the above problems, the present invention provides an aerobic reaction system with automatic sludge return, which utilizes the circulation of water to achieve unpowered sludge return, and can effectively solve the problems of damage to sludge flocs when sludge is currently returned by water pump lifting, as well as high pump maintenance costs and operating energy consumption. It has the advantages of low energy consumption, simple operation, and low operating cost.

[0005] The aerobic reaction system with automatic sludge reflow comprises a main tank body, in which an upflow zone, a first partition wall, a downflow zone, a second partition wall, a guide zone, a third partition wall, a sedimentation zone and a water outlet pipe are sequentially arranged, a water inlet pipe is arranged at the bottom of the upflow zone, an air stripping device is arranged in the upflow zone to provide upflow power, and a submerged fan is arranged at the bottom of the upflow zone or the downflow zone to provide gas for the air stripping device;

[0006] The top of the second partition wall is lower than the liquid level of the total pool body, the top of the first partition wall is lower than the top of the second partition wall, the top of the third partition wall is higher than the liquid level of the total pool body, the bottoms of the first partition wall, the second partition wall and the third partition wall are all higher than the bottom surface of the total pool body, and the bottom of the first partition wall is higher than the bottom of the second partition wall, so that the sewage can circulate between the upflow area and the downflow area for treatment, the treated water passes over the second partition wall, enters the diversion area, and then passes over the bottom of the third partition wall to enter the sedimentation area for mud and water separation, the separated sludge flows back from the bottom of the sedimentation area to the upflow area and the downflow area, and the supernatant is discharged from the total pool body through the outlet pipe.

[0007] Optionally, an aeration device is provided at the bottom of the upflow zone, the air inlet of the submersible fan is connected to an air inlet pipeline, the top opening of the air inlet pipeline is above the liquid level of the total pool body, and the air outlet of the submersible fan is connected in parallel to the air lift device and the aeration device through a pipeline.

[0008] Further optionally, the gas lift device includes a gas lift pipeline and a gas lift perforated pipe, the gas lift pipeline is vertically arranged and has a second regulating valve on the top, the gas lift perforated pipe is horizontally arranged and has densely distributed air holes on the upper surface, the bottom end of the gas lift pipeline is connected to the middle part of the gas lift perforated pipe, and the gas lift perforated pipe is located in the lower part of the upflow zone.

[0009] The treated water in the downflow area can pass over the second partition wall and enter the diversion area, preparing to enter the sedimentation area for mud and water separation.

[0010] Optionally, the bottom of the third partition wall is in the middle of the sedimentation area and is much higher than the bottom of the second partition wall, so that the length of the diversion area is half of the sedimentation area. When the water in the diversion area moves downward to the bottom of the third partition wall, it can enter the sedimentation area for mud and water separation.

[0011] Optionally, a downwardly inclined mud guide plate is provided at the bottom of the sedimentation zone. The mud guide plate is provided on the opposite side of the second partition wall and inclined toward the second partition wall, so as to guide the sludge separated in the sedimentation zone to flow toward the second partition wall.

[0012] Optionally, the sedimentation area includes a first inclined plate area and a second inclined plate area, the bottom end of the third partition wall is located in the middle and lower part of the first inclined plate area, and the second inclined plate area is located below the first inclined plate area;

[0013] The first inclined plate area includes a first inclined plate wound in a spiral shape, the first inclined plates are at the same horizontal height as a whole, and the bottoms of the first inclined plates are all inclined toward the opposite side of the guide area;

[0014] The second inclined plate area includes a second inclined plate wound in a spiral shape, the bottom of the second inclined plate is inclined toward the direction of the guide area, the second inclined plate is wound from the periphery to the middle, and the level of the middle part is lower than the level of the outer sides.

[0015] Further optionally, a plurality of mutually parallel protruding mud-blocking and diversion ridges are provided on the side of the first inclined plate facing the diversion area, and the same mud-blocking and diversion ridge is arranged along the first inclined plate and is at the same horizontal height, that is, the same mud-blocking and diversion ridge is also spirally wound along the first inclined plate.

[0016] Further optionally, the mud-blocking and diverting rib is formed by a plurality of horizontal shuttle-shaped protrusions connected end to end, that is, there are shuttle-shaped bulge protrusions and narrow strip protrusions arranged at intervals along the mud-blocking and diverting rib.

[0017] Further optionally, both sides of the second inclined plate are provided with evenly distributed fish-scale surfaces, and the fish-scale surfaces have evenly distributed pentagonal or hexagonal protrusions and recessed portions between adjacent protrusions.

[0018] Optionally, the main pool body is circular, and the upflow area, the first partition wall, the downflow area, the second partition wall, the diversion area, the third partition wall and the sedimentation area are arranged from the inside to the outside, the upflow area is cylindrical, and the other areas and partition walls are circular, which are arranged in sequence; the overflow weir and the outlet pipe are arranged on one side of the main pool body.

[0019] Optionally, the main pool body is rectangular, and an upflow area, a first partition wall, a downflow area, a second partition wall, a guide area, a third partition wall, a sedimentation area and a water outlet pipe are arranged in sequence from one side to the opposite side of the main pool body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the top view of an aerobic reaction system with automatic sludge reflow;

[0021] Figure 2 for Figure 1 A side view structural schematic diagram of;

[0022] Figure 3 for Figure 1 A schematic diagram of the top view structure of the precipitation zone;

[0023] Figure 4 is a three-dimensional schematic diagram of a first inclined plate and a second inclined plate;

[0024] Figure 5 Schematic diagram of the structure of the first inclined plate (single turn);

[0025] Figure 6 is a schematic structural diagram of the second inclined plate;

[0026] Figure 7 It is a top view schematic diagram of another aerobic reaction system with automatic sludge reflow;

[0027] Figure 8 for Figure 7 Schematic diagram of the side structure.

[0028] In the accompanying drawings, 1-main pool body, 2-upflow zone, 3-first partition wall, 4-downflow zone, 5-second partition wall, 6-diversion zone, 7-third partition wall, 8-sedimentation zone, 9-outlet pipe, 10-inlet pipe, 11-air lift device, 12-submerged fan, 13-fish scale surface, 14-aeration device, 15-air inlet pipeline, 16-first regulating valve, 17-second regulating valve, 18-muffler, 19-air lift pipeline, 20-air lift perforated pipe, 21-overflow weir, 22-mud guide plate, 23-mud discharge pipe, 24-first inclined plate, 25-second inclined plate, 26-mud blocking and diversion ridge. DETAILED DESCRIPTION

[0029] This embodiment provides an aerobic reaction system with automatic sludge reflow, such as Figure 1-Figure 8 As shown, it comprises a main tank body 1, in which an upflow area 2, a first partition wall 3, a downflow area 4, a second partition wall 5, a guide area 6, a third partition wall 7, a sedimentation area 8 and a water outlet pipe 9 are sequentially arranged, a water inlet pipe 10 is arranged at the bottom of the upflow area 2, a gas stripping device 11 is arranged in the upflow area 2 for providing upflow power, and a submerged fan 12 is arranged at the bottom of the upflow area 2 or the downflow area 4 for providing gas for the gas stripping device 11;

[0030] The top of the second partition wall 5 is lower than the liquid level of the main tank body 1, the top of the first partition wall 3 is lower than the top of the second partition wall 5, the top of the third partition wall 7 is higher than the liquid level of the main tank body 1, the bottoms of the first partition wall 3, the second partition wall 5 and the third partition wall 7 are all higher than the bottom surface of the main tank body 1, and the bottom of the first partition wall 3 is higher than the bottom of the second partition wall 5, so that the sewage can circulate and flow between the upflow area 2 and the downflow area 4 for treatment, the treated water body passes over the top of the second partition wall 5, enters the diversion area 6, and then passes over the bottom of the third partition wall 7, and enters the sedimentation area 8 for mud and water separation, and the separated sludge flows back from the bottom of the sedimentation area 8 to the upflow area 2 and the downflow area 4, and the supernatant is discharged from the main tank body 1 through the outlet pipe 9.

[0031] Optionally, an aeration device 14 is provided at the bottom of the upflow zone 2, which cooperates with the air stripping device 11 and the water inlet pipe 10 to keep the sewage in the upflow zone 2 flowing upward while aerating and oxygenating the influent sewage;

[0032] The air inlet of the submersible fan 12 is connected to the air inlet pipeline 15, the top opening of the air inlet pipeline 15 is above the liquid level of the main tank body 1, and is used to inhale air. The air outlet of the submersible fan 12 is connected to the air stripping device 11 and the aeration device 14 in parallel through a pipeline to supply air to the air stripping device 11 and the aeration device 14.

[0033] Further optionally, a first regulating valve 16 is provided on the pipeline of the submersible fan 12 in parallel with the aeration device 14, for adjusting the amount of air input into the aeration device 14, and further adjusting the aeration amount.

[0034] Further optionally, a muffler 18 is provided at the top opening of the air intake pipeline 15 to reduce the noise of the submersible fan 12 when taking in air.

[0035] Further optionally, the gas lift device 11 includes a gas lift pipeline 19 and a gas lift perforated pipe 20, the gas lift pipeline 19 is vertically arranged and has a second regulating valve 17 on the top, the gas lift perforated pipe 20 is horizontally arranged and has densely distributed air holes on the upper surface, the bottom end of the gas lift pipeline 19 is connected to the middle part of the gas lift perforated pipe 20, and the gas lift perforated pipe 20 is located in the lower part of the upflow area 2.

[0036] The gas provided by the submerged fan 12 is adjusted by the second regulating valve 17 to enter the gas lift pipeline 19, and the gas is then input into the gas lift perforated pipe 20. After the gas is evenly distributed through the gas lift perforated pipe 20, an upward force is formed at the lower part of the upflow area 2, driving the water body in the upflow area 2 to move upward.

[0037] Sewage enters the upflow area 2 from the water inlet pipe 10. Aerobic sludge is provided in both the upflow area 2 and the downflow area 4 for biochemical treatment of sewage. The aeration device 14 oxygenates the sewage inlet. At the same time, the sewage flows upward under the action of the airflow of the air stripping device 11 and the aeration device 14. Then, it passes over the top of the first partition wall 3 and enters the downflow area 4, and flows downward in the downflow area 4. When the sewage flows to the bottom of the downflow area 4, since the bottom of the first partition wall 3 is higher than the bottom of the second partition wall 5, the sewage preferably passes over the first partition wall 3 and enters the upflow area 2. In this way, the sewage returns to circulate in the upflow area 2 and the downflow area 4 for biochemical treatment.

[0038] The treated water in the downflow area 4 passes over the second partition wall 5 and enters the diversion area 6, and is ready to enter the sedimentation area 8 for mud-water separation.

[0039] Optionally, the bottom of the third partition wall 7 is located in the middle of the sedimentation area 8 and is much higher than the bottom of the second partition wall 5, so that the length of the diversion area 6 is half of the sedimentation area 8. When the water in the diversion area 6 moves downward to the bottom of the third partition wall 7, it can enter the sedimentation area 8 for mud and water separation.

[0040] Optionally, an overflow weir 21 is provided at the top of the sedimentation zone 8 and on the opposite side of the third partition wall 7. The overflow weir 21 is connected to the outlet pipe 9. The overflow weir 21 is lower than the top of the third partition wall. Since the top of the third partition wall 7 is higher than the liquid level of the total pool body 1, the supernatant separated in the sedimentation zone 8 cannot cross the third partition wall 7 and can only overflow from the overflow weir 21 and then be discharged from the total pool body 1 through the outlet pipe 9.

[0041] Optionally, a downwardly inclined mud guide plate 22 is provided at the bottom of the sedimentation zone 8 . The mud guide plate 22 is provided on the opposite side of the second partition wall 5 and inclined toward the second partition wall 5 , so as to guide the sludge separated in the sedimentation zone 8 to flow toward the second partition wall 5 .

[0042] Since the length of the guide area 6 is relatively short, the middle and lower part of the actual sedimentation area 8 is separated from the downflow area 4 only by the second partition wall 5. The sludge separated and precipitated in the sedimentation area 8 flows through the mud guide plate 22, and then flows to the downflow area 4 and the upflow area 2 under the guidance of the mud guide plate 22, so that the automatic sludge reflux can be completed. If the power of automatic reflux is insufficient, the sludge only flows to the bottom of the downflow area 4. Under the action of the circulating water flow power of the downflow area 4, the sludge can also flow into the upflow area 2 with the water body circulation.

[0043] Further optionally, a mud discharge pipe 23 is provided at the mud guide plate 22 for discharging excess sludge from the main tank body 1 for subsequent conventional sludge treatment.

[0044] Optionally, the sedimentation area 8 includes a first inclined plate 24 area and a second inclined plate 25 area, the bottom end of the third partition wall 7 is located in the middle and lower part of the first inclined plate 24 area, and the second inclined plate 25 area is located below the first inclined plate 24 area;

[0045] The first inclined plate 24 area includes a first inclined plate 24 wound in a spiral shape, the first inclined plates 24 are at the same horizontal height as a whole, and the bottoms of the first inclined plates 24 are all inclined toward the opposite side of the guide area 6;

[0046] The second inclined plate 25 area includes a second inclined plate 25 wound in a spiral shape, the bottom of the second inclined plate 25 is inclined toward the direction of the guide area 6, and the second inclined plate 25 is wound from the periphery to the middle, and the horizontal height of the middle part is lower than the horizontal height of the outer sides.

[0047] Further optionally, the first inclined plate 24 is provided with a plurality of mutually parallel protruding mud-blocking and diversion ribs 26 on the side facing the diversion area 6, and the same mud-blocking and diversion rib 26 is arranged along the first inclined plate 24 and is at the same horizontal height, that is, the same mud-blocking and diversion rib 26 is also spirally wound along the first inclined plate 24.

[0048] Further optionally, the mud retaining and diverting rib 26 is formed by a plurality of horizontal shuttle-shaped protrusions connected end to end, that is, there are shuttle-shaped bulge protrusions and narrow strip protrusions arranged at intervals along the mud retaining and diverting rib 26. This pattern is beneficial for intercepting the sludge passing through the first inclined plate 24 and promoting sludge sedimentation. The shuttle-shaped protrusion is also beneficial for reducing the flow resistance of the water flowing along the spiral first inclined plate 24.

[0049] Further optionally, both sides of the second inclined plate 25 are provided with a uniformly distributed fish-scale surface 13, and the fish-scale surface 13 has uniformly distributed pentagonal or hexagonal protrusions and recessed portions between adjacent protrusions. Since the muddy water separated from the first inclined plate 24 flows along the spiral second inclined plate 25, the fish-scale surface 13 of the second inclined plate 25 is beneficial for the sludge in the muddy water to contact with the second inclined plate 25 and flow down along the second inclined plate 25 again, further separating the muddy water, and making the water body have less resistance when flowing along the second inclined plate 25.

[0050] Optionally, the main pool body 1 can be circular, and the upflow area 2, the first partition wall 3, the downflow area 4, the second partition wall 5, the guide area 6, the third partition wall 7 and the sedimentation area 8 are arranged from the inside to the outside, the upflow area 2 is cylindrical, and the other areas and partition walls are circular, which are arranged in sequence; the overflow weir 21 and the outlet pipe 9 are arranged on one side of the main pool body 1.

[0051] Further optionally, the first inclined plate 24 starts from a position close to the bottom of the guide area 6 and is arranged in circles along the annular sedimentation area 8 to form a spiral pattern surrounding the internal upflow area 2, downflow area 4 and guide area 6, and the height of each circle of the first inclined plate 24 is the same.

[0052] After the water discharged from the bottom of the diversion area 6 enters the sedimentation area 8, it first encounters the innermost circle of the first inclined plate 24. A plurality of mud-blocking and diversion ridges 26 arranged vertically are provided on the side of the circle facing the diversion area 6. The water discharged from the diversion area 6 can flow along the mud-blocking and diversion ridges 26 and the sides of the first inclined plate 24. As the water discharged from the diversion area 6 gradually increases, the water discharged can gradually flow to the opposite side of the diversion area 6 along the spiral first inclined plate 24, and mud and water are separated at the same time. The separated water flows upward and is discharged from the main pool body 1 by the overflow weir 21 and the outlet pipe 9. The separated sludge flows downward along the first inclined plate 24. At the same time, the mud-blocking and diversion ridges 26 on the first inclined plate 24 can promote mud-water separation. Compared with traditional components for intercepting sludge, the mud-blocking and diversion ridges 26 of the present invention can reduce water flow resistance to a certain extent and promote water flow along the first inclined plate 24.

[0053] Further optionally, the second inclined plate 25 starts from the inner wall of the main pool body 1 on the opposite side of the guide area 6, and is arranged in circles along the annular sedimentation area 8, and the height gradually decreases to form a spiral pattern surrounding the internal upflow area 2, downflow area 4 and guide area 6, that is, the lowest point of the second inclined plate 25 is close to the downflow area 4.

[0054] The muddy water separated from the first inclined plate 24 has a large mud content and flows to the second inclined plate 25 area, and does not distinguish between the front and back sides of the second inclined plate 25, and flows down along the two sides of the second inclined plate 25 in a spiral. Since the lowest point of the second inclined plate 25 is close to the side of the downflow area 4, the sludge flowing down along the second inclined plate 25 is close to the downflow area 4, which is conducive to the return of the sludge to the downflow area 4 and the upflow area 2. The fish scale surface 13 of the second inclined plate 25 is conducive to the contact between the sludge and the second inclined plate 25, improves the mud-water separation efficiency, and reduces the flow resistance of the water body. Since the effluent of the diversion area 6 is preferentially sludge-precipitated on the first inclined plate 24 close to the diversion area 6, the separation of the first inclined plate 24 close to the diversion area 6 is relatively large. The first inclined plate 24 of the present invention is spiral, and the mud-blocking diversion ridge 26 is designed to guide and promote the effluent to flow along the first inclined plate 24 to the opposite side of the diversion area 6, so that the separation load of the entire first inclined plate 24 is as uniform as possible. At the same time, the spiral downward shape of the second inclined plate 25 can give the water in the sedimentation area 8 a spiral stirring force, promote the muddy water separated by the first inclined plate 24 to flow downward, and make the muddy water as evenly distributed as possible along the cross section of the sedimentation area 8. The sludge settled from other positions in the sedimentation area is still guided to the downflow area 4 by the mud guide plate 22.

[0055] Optionally, the main pool body 1 may be rectangular, and an upflow area 2, a first partition wall 3, a downflow area 4, a second partition wall 5, a guide area 6, a third partition wall 7, a sedimentation area 8 and a water outlet pipe 9 are sequentially arranged from one side to the opposite side of the main pool body 1.

[0056] Further optionally, the first inclined plate 24 starts from a position close to the bottom of the guide area 6 and is arranged in circles along the cross-section of the rectangular sedimentation area 8 to form a spiral pattern inside the sedimentation area 8, and the height of each circle of the first inclined plate 24 is the same.

[0057] Further optionally, the second inclined plate 25 is arranged in circles along the rectangular sedimentation area 8 with the inner wall of the main tank body 1 near the opposite side of the diversion area 6 as the starting point, and the height is gradually reduced to form a spiral pattern inside the sedimentation area 8, and the lowest point of the second inclined plate 25 is at the center of the bottom of the sedimentation area 8. The operation of the first inclined plate 24 area and the second inclined plate 25 area of ​​the rectangular sedimentation area 8 is similar to the operation of the first inclined plate 24 area and the second inclined plate 25 area of ​​the annular sedimentation area 8, except that the sludge flowing out from the bottom of the second inclined plate 25 is slightly farther from the downflow area 4.

Claims

1. An aerobic reaction system with automatic sludge reflow, characterized in that: It comprises a main pool body, in which an upflow area, a first partition wall, a downflow area, a second partition wall, a guide area, a third partition wall, a sedimentation area and a water outlet pipe are sequentially arranged, a water inlet pipe is arranged at the bottom of the upflow area, a gas lift device is arranged in the upflow area for providing upflow power, and a submerged fan is arranged at the bottom of the upflow area or the downflow area for providing gas for the gas lift device; The top of the second partition wall is lower than the liquid level of the total tank body, the top of the first partition wall is lower than the top of the second partition wall, the top of the third partition wall is higher than the liquid level of the total tank body, the bottoms of the first partition wall, the second partition wall and the third partition wall are all higher than the bottom surface of the total tank body, and the bottom of the first partition wall is higher than the bottom of the second partition wall, so that the sewage can circulate and flow between the upflow area and the downflow area for treatment, the treated water body passes over the second partition wall, enters the diversion area, and then passes over the bottom of the third partition wall to enter the sedimentation area for mud and water separation, the separated sludge flows back from the bottom of the sedimentation area to the upflow area and the downflow area, and the supernatant is discharged from the total tank body through the outlet pipe; The bottom of the third partition wall is located in the middle of the sedimentation area and is much higher than the bottom of the second partition wall, so that the length of the diversion area is half of the sedimentation area. When the water in the diversion area moves downward to the bottom of the third partition wall, it can enter the sedimentation area for mud and water separation; A downwardly inclined mud guide plate is provided at the bottom of the sedimentation zone, and the mud guide plate is provided on the opposite side of the second partition wall and is inclined in the direction of the second partition wall, so as to guide the sludge separated in the sedimentation zone to flow in the direction of the second partition wall; The sedimentation area includes a first inclined plate area and a second inclined plate area, the bottom end of the third partition wall is located in the middle and lower part of the first inclined plate area, and the second inclined plate area is located below the first inclined plate area; The first inclined plate area includes a first inclined plate wound in a spiral shape, the first inclined plates are at the same horizontal height as a whole, and the bottoms of the first inclined plates are all inclined toward the opposite side of the guide area; The second inclined plate area includes a second inclined plate wound in a spiral shape, the bottom of the second inclined plate is inclined in the direction of the guide area, the second inclined plate is wound from the periphery to the middle, and the level of the middle part is lower than the level of the outer sides of the periphery; A plurality of mutually parallel convex mud-blocking and diversion ridges are provided on the side of the first inclined plate facing the diversion area. The same mud-blocking and diversion ridge is arranged along the first inclined plate and is at the same horizontal height. The same mud-blocking and diversion ridge is also spirally wound along the first inclined plate. The mud-blocking and diverting rib is formed by connecting a plurality of horizontal shuttle-shaped protrusions end to end, and shuttle-shaped bulge protrusions and narrow strip protrusions are arranged at intervals along the mud-blocking and diverting rib.

2. The aerobic reaction system for automatic sludge reflow according to claim 1, characterized in that: An aeration device is provided at the bottom of the upflow zone, the air inlet of the submersible fan is connected to an air inlet pipeline, the top opening of the air inlet pipeline is above the liquid level of the main tank body, and the air outlet of the submersible fan is connected to the air lift device and the aeration device in parallel through a pipeline to supply air to the air lift device and the aeration device.

3. The aerobic reaction system with automatic sludge reflow according to claim 2 is characterized in that: The gas lift device comprises a gas lift pipeline and a gas lift perforated pipe. The gas lift pipeline is vertically arranged and has a second regulating valve on the top. The gas lift perforated pipe is horizontally arranged and has densely distributed vents on the upper surface. The bottom end of the gas lift pipeline is connected to the middle of the gas lift perforated pipe, and the gas lift perforated pipe is located at the lower part of the upflow zone.

4. The aerobic reaction system with automatic sludge reflow according to claim 1, characterized in that: Both sides of the second inclined plate are provided with evenly distributed fish-scale surfaces, and the fish-scale surfaces have evenly distributed pentagonal or hexagonal protrusions and concave parts between adjacent protrusions.

5. The aerobic reaction system with automatic sludge reflow according to claim 4 is characterized in that: The main pool body is circular, and the upflow area, the first partition wall, the downflow area, the second partition wall, the guide area, the third partition wall and the sedimentation area are arranged from the inside to the outside. The upflow area is cylindrical, and the other areas and partition walls are circular, which are arranged in sequence; the overflow weir and the outlet pipe are arranged on one side of the main pool body.

6. The aerobic reaction system with automatic sludge reflow according to claim 4, characterized in that: The main pool body is rectangular, and an upflow area, a first partition wall, a downflow area, a second partition wall, a guide area, a third partition wall, a sedimentation area and a water outlet pipe are sequentially arranged from one side to the opposite side of the main pool body.

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