Lateral flow self-sustaining aerobic granular sludge device

Abstract

The utility model relates to the technical field of sewage treatment, and provides a side-flow self-sustaining aerobic granular sludge device, which comprises a body, an aerobic zone, an aerobic zone, an aerobic zone and an aerobic zone, the aerator is arranged in the aerobic zone; the premixing cover covers the air outlet end of the aerator, and a space between the premixing cover and the aerator forms a premixing area; a gap is reserved between the premixing cover and the aerator to form a first water return port, and the first water return port is communicated with the premixing area and the space outside the premixing area; wherein the flow area of the release port of the premixing cover is smaller than that of the water inlet of the premixing cover, so that the pressure in the premixing area is increased in an aeration state. According to the side-flow self-sustaining aerobic granular sludge device provided by the utility model, the concentration of dissolved oxygen in the aerobic zone is improved by refluxing, mixing and pressurizing dissolved gas, the aerobic treatment efficiency is higher under the same aeration condition, and more energy is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a side-flow self-sustaining aerobic granular sludge device. Background Art

[0002] The existing aerobic reaction device mainly includes an anoxic zone, an aerobic zone and a sedimentation zone which are arranged in sequence along the flow path of the sewage. After the raw water of the sewage enters the anoxic zone, it is diluted and mixed with the microorganisms inside it to undergo anoxic reaction. After that, the sewage enters the aerobic zone for aerobic reaction to further remove pollutants in the sewage. After that, the sewage enters the sedimentation zone for sedimentation separation. For the aerobic zone, it is usually necessary to use an aerator to transfer oxygen in the air to the liquid in the aerobic zone to supply the amount of oxygen required for the metabolism of aerobic organisms. At the same time, the water in the aerobic zone is fully and evenly mixed to achieve the purpose of biological treatment. However, for the current structural design of the aerobic zone, after the gas escapes from the aerator, it will move directly toward the direction of the liquid surface. The gas-water mixed liquid has a short extension distance, resulting in a low concentration of dissolved oxygen and an unsatisfactory mixing effect. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is that in the current aerobic zone structural design, after the gas escapes from the aerator, it will move directly toward the liquid surface, and the gas-water mixed liquid has a short extension, resulting in a low dissolved oxygen concentration and an unsatisfactory mixing effect, thereby providing a side-stream self-sustaining aerobic granular sludge device.

[0004] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0005] The utility model provides a side-stream self-sustaining aerobic granular sludge device, comprising: a body, wherein at least an aerobic zone is arranged in the body; an aerator, which is arranged in the aerobic zone; a premixing hood, which is arranged at the air outlet end of the aerator, and the space between the premixing hood and the aerator forms a premixing zone; a gap is left between the premixing hood and the aerator to form a first water return port, and the first water return port communicates with the premixing zone and the space outside the premixing zone; wherein the flow area of ​​the release port of the premixing hood is smaller than the flow area of ​​the water inlet of the premixing hood, so as to increase the pressure in the premixing zone under the aeration state.

[0006] Furthermore, the side stream self-sustaining aerobic granular sludge device also includes a speed-retaining tube, which is arranged in the aerobic zone; one end of the speed-retaining tube is connected to the release port of the premixing hood, and the other end extends in a direction away from the aerator, and the diameter of the speed-retaining tube is equal to the diameter of the release port of the premixing hood.

[0007] Furthermore, the side-stream self-sustaining aerobic granular sludge device also includes an aerobic acceleration throat, which is arranged in the aerobic zone; one end of the aerobic acceleration throat is connected to the end of the speed-maintaining pipe away from the premixing hood, and the other end extends toward the downstream of the aerobic zone to guide the water in the aerobic acceleration throat to flow toward the downstream of the aerobic zone.

[0008] Furthermore, the side-stream self-sustaining aerobic granular sludge device also includes an aerobic accelerating nozzle, which is arranged in the premixing zone; the large-mouth end of the aerobic accelerating nozzle is arranged toward the aerator, and the small-mouth end of the aerobic accelerating nozzle at least partially extends into the premixing hood.

[0009] Furthermore, an anoxic zone and a sedimentation zone are also arranged in the body, and the anoxic zone is located upstream of the aerobic zone, and the sedimentation zone is located downstream of the aerobic zone; it also includes a light sludge collection bucket, which is arranged in the sedimentation zone, and a sludge discharge pipe extending to the outside of the body is arranged at the bottom of the light sludge collection bucket.

[0010] Furthermore, the side-stream self-sustaining aerobic granular sludge device also includes a three-phase separator, which is arranged around the light sludge collecting bucket, and the gas collecting tank of the three-phase separator is connected with the anoxic zone through a collecting pipe.

[0011] Furthermore, the side-stream self-sustaining aerobic granular sludge device also includes an inlet pipe and an inlet injector; the inlet pipe is arranged in the aerobic zone, and the top end of the inlet pipe is closed, and the inlet pipe is connected to the air collecting tank of the three-phase separator through an inlet branch pipe; one end of the inlet injector is used to be connected to an external sewage source, and the other end extends into the inlet pipe.

[0012] Furthermore, a reflux channel is provided at the center of the aerobic zone, and inner and outer areas of the reflux channel are connected, so that part of the water in the aerobic zone circulates between the aerobic zone and the reflux channel.

[0013] Furthermore, the water inlet pipe and the water inlet ejector are both arranged in the reflux channel.

[0014] Furthermore, the side-stream self-sustaining aerobic granular sludge device also includes a sludge return pipe, one end of which is connected to the light sludge collection bucket, and the other end of which is connected to the water inlet pipe.

[0015] The technical solution of the utility model has the following advantages:

[0016] The side-stream self-sustaining aerobic granular sludge device provided by the utility model forms a premixing zone between the aerator and the premixing hood by arranging a premixing hood in the aerobic zone. The aerator releases air in the premixing zone. Due to the rapid rise of the bubbles, the water outside the premixing zone is driven to enter the premixing zone through the first water return port. In addition, the release port just above the premixing hood is reduced in diameter to increase the pressure in the premixing zone, so that the bubbles are further mixed with the water returned through the first water return port, and due to the increase in pressure, the effect of gas dissolving into water will be better. The mixed gas-water mixture is ejected through the release port and rises to the aerobic area outside the premixing zone. In this way, the concentration of dissolved oxygen in the aerobic zone is increased by reflux, mixing and pressurizing dissolved gas. Under the same aeration conditions, the efficiency of aerobic treatment is higher and more energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of a side-flow self-sustaining aerobic granular sludge device in an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of a three-phase separator in a side-stream self-sustaining aerobic granular sludge device in an embodiment of the utility model.

[0020] Description of reference numerals:

[0021] 1. Main body; 2. Aerobic zone; 3. Anoxic zone; 4. Sedimentation zone; 5. Recirculation channel; 6. First annular member; 7. Second annular member; 8. Aerator; 9. Premixing hood; 10. Speed-retaining tube; 11. Aerobic acceleration throat; 12. Aerobic acceleration nozzle; 13. Gas collecting tank; 14. Light sludge collecting bucket; 15. Mud discharge pipe; 16. Three-phase separator; 17. Collecting pipe; 18. Inlet ejector; 19. Inlet throat; 20. Sludge return pipe; 21. Premixing zone; 22. First water return port; 23. First notch; 24. Reverse flow guide cone; 25. Second notch; 26. Third notch; 27. Inlet branch pipe; 28. Inlet main pipe; 29. ​​Oblique pipe separation device; 30. Outlet tank; 31. Outlet pipe; 32. Drain pipe. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1 , Figure 2 As shown, this embodiment provides a side-stream self-sustaining aerobic granular sludge device, including: a body 1, for example, the body 1 can be a vertical round tank structure. The interior of the body 1 is provided with an anoxic zone 3, an aerobic zone 2 and a sedimentation zone 4 arranged along the flow path of the water body. For example, a first annular member 6 is arranged in the body 1, and the first annular member 6 can be arranged concentrically with the body 1, the lower half of the area inside the first annular member 6 forms the aerobic zone 2, the upper half of the area inside the first annular member 6 forms the sedimentation zone 4, and the area between the outer wall of the first annular member 6 and the inner wall of the body 1 forms the anoxic zone 3.

[0027] A first gap 23 is left between the bottom end of the first annular member 6 and the bottom of the body 1 . The first gap 23 is used to connect the anoxic zone 3 with the aerobic zone 2 . The top end of the first annular member 6 extends to the top of the body 1 .

[0028] A second annular member 7 is also provided in the aerobic zone 2. The second annular member 7 can be provided concentrically with the body 1. The area inside the second annular member 7 forms a reflux channel 5. A second notch 25 is provided between the bottom end of the second annular member 7 and the bottom of the body 1. A third notch 26 is provided between the top end of the second annular member 7 and the bottom of the light sludge collecting bucket 14. The second notch 25 and the third notch 26 are used to connect the reflux channel 5 with the aerobic zone 2.

[0029] The aerator 8 is arranged in the aerobic zone 2; the premixing hood 9 is arranged at the outlet end of the aerator 8, and the space between the premixing hood 9 and the aerator 8 forms a premixing zone 21; a gap is left between the premixing hood 9 and the aerator 8 to form a first water return port 22, and the first water return port 22 connects the premixing zone 21 with the space outside the premixing zone 21; wherein, the flow area of ​​the release port of the premixing hood 9 is smaller than the flow area of ​​the water inlet of the premixing hood 9, so as to increase the pressure in the premixing zone 21 under the aeration state. For example, a plurality of aerators 8 can be arranged in the aerobic zone 2, and the aerators 8 can be arranged in a point shape in the aerobic zone 2, for example, a plurality of aerators 8 arranged in a point shape can be surrounded in a ring. The aerator 8 can also be arranged in a strip shape in the aerobic zone 2, for example, a plurality of aerators 8 can be arranged in a row or in an array. The arrangement of the aerator 8 is not limited to the above two methods, and the actual arrangement of the aerator 8 can be designed as needed. For example, the premixing hood 9 can be a truncated cone structure, with both ends open, the large end at the bottom, the small end at the top, and the small end used as a release port. For another example, the premixing hood 9 can also be a prism structure, with both ends open, the large end at the bottom, the small end at the top, and the small end used as a release port. The premixing hood 9 can be welded to the side wall of the aerobic zone 2 by setting a connecting rod on the side wall; it can also be installed as an integrated structure with the trachea bracket of the aerator 8 and fixed on the trachea bracket of the aerator 8.

[0030] The side-stream self-sustaining aerobic granular sludge device provided in this embodiment forms a premixing zone 21 between the aerator 8 and the premixing hood 9 by setting a premixing hood 9 in the aerobic zone 2. The aerator 8 releases air in the premixing zone 21. Due to the rapid rise of the bubbles, the water outside the premixing zone 21 will be driven into the premixing zone 21 through the first water return port 22. In addition, the release port just above the premixing hood 9 is reduced in diameter, which increases the pressure in the premixing zone 21, so that the bubbles are further mixed with the water flowing back through the first water return port 22. Due to the increase in pressure, the effect of gas dissolving in water will be better. The mixed gas-water mixture is ejected through the release port and rises to the aerobic zone 2 outside the premixing zone 21. In this way, the concentration of dissolved oxygen in the aerobic zone 2 is increased by reflux, mixing and pressurized dissolved gas. Under the same aeration conditions, the efficiency of aerobic treatment is higher and more energy-saving.

[0031] Among them, the side stream self-sustaining aerobic granular sludge device also includes a speed-retaining tube 10, which is arranged in the aerobic zone 2; one end of the speed-retaining tube 10 is connected to the release port of the premixing hood 9, and the other end extends in the direction away from the aerator 8, and the diameter of the speed-retaining tube 10 is equal to the diameter of the release port of the premixing hood 9. For example, when the premixing hood 9 is a truncated cone structure, the speed-retaining tube 10 can be a round tube. When the premixing hood 9 is a prism-shaped structure, the speed-retaining tube 10 can be a square tube, so as to match the shape of the premixing hood 9. When in use, the gas-water mixture flowing out of the release port of the premixing hood 9 can enter the speed-retaining tube 10, and the speed of the gas-water mixture in the speed-retaining tube 10 changes little, and a high flow rate can be maintained, and then released from the top outlet of the speed-retaining tube 10. In this way, a section of the speed-retaining tube 10 is added to the release port of the premixing hood 9, and this straight speed-retaining tube 10 can keep the drainage force of the premixing zone 21 relatively large. Because the speed-retaining tube 10 increases the release port height of the premixing hood 9, the velocity of the gas-water mixture outside the premixing hood 9 is relatively low, and the velocity difference with the gas-water mixture in the premixing zone 21 is relatively large, so the pressure difference is large. Compared with the absence of the speed-retaining tube 10, the velocity difference between the two is greater, so the drainage effect of the premixing zone 21 is better.

[0032] Among them, the side stream self-sustaining aerobic granular sludge device also includes an aerobic acceleration throat 11, which is arranged in the aerobic zone 2; one end of the aerobic acceleration throat 11 is connected to the end of the speed-maintaining tube 10 away from the premixing cover 9, and the other end extends toward the downstream of the aerobic zone 2 to guide the water in the aerobic acceleration throat 11 to flow toward the downstream of the aerobic zone 2. For example, the height of the aerobic acceleration throat 11 can account for half or even more of the height of the entire aerobic zone 2. Generally, the top of the aerobic acceleration throat 11 does not exceed the top of the second annular member 7. With such a configuration, for the wide-mouthed aerobic zone (the upper parts of other aerobic zones are all constricted), a relatively high rising flow rate can be maintained in the aerobic zone to avoid the rising flow rate being too slow due to the dispersion of the water to the surrounding areas, which is more conducive to the scrubbing and formation of granular sludge.

[0033] The side stream self-sustaining aerobic granular sludge device further includes an aerobic accelerating nozzle 12, which is arranged in the premixing zone 21; the large end of the aerobic accelerating nozzle 12 is arranged toward the aerator 8, and the small end of the aerobic accelerating nozzle 12 at least partially extends into the premixing cover 9. For example, the aerobic accelerating nozzle 12 can be provided with multiple stages, for example, the aerobic accelerating nozzle 12 can be provided with two stages, and the flow rate of the water body can be further increased by the mutual nesting of the aerobic accelerating nozzles 12.

[0034] There may be a plurality of aerators 8 in the aerobic zone 2 , and each aerator 8 may be provided with a premixing hood 9 , a speed-retaining pipe 10 , an aerobic accelerating nozzle 12 and an aerobic accelerating throat 11 .

[0035] The side-stream self-sustaining aerobic granular sludge device further comprises a light sludge collecting bucket 14 arranged in the sedimentation zone 4 , and a sludge discharge pipe 15 extending to the outside of the main body 1 is arranged at the bottom of the light sludge collecting bucket 14 .

[0036] The side stream self-sustaining aerobic granular sludge device further includes a three-phase separator 16, which is located at the boundary between the sedimentation zone 4 and the aerobic zone 2, and the three-phase separator 16 is arranged around the light sludge collection bucket 14, and the gas collecting tank 13 of the three-phase separator 16 is connected to the anoxic zone 3 through the collecting pipe 17. The three-phase separator 16 can be a three-phase separator 16 in the prior art.

[0037] For example, four or more collecting pipes 17 may be evenly distributed around the circumference.

[0038] Among them, the side stream self-sustaining aerobic granular sludge device also includes an inlet pipe 19 and an inlet ejector 18; the inlet pipe 19 is arranged in the aerobic zone 2, and the top end of the inlet pipe 19 is closed, and the inlet pipe 19 is connected to the air collecting tank 13 of the three-phase separator 16 through the inlet branch pipe 27; one end of the inlet ejector 18 is connected to the external sewage source through the inlet main pipe 28, and the other end extends into the inlet pipe 19.

[0039] For example, the water inlet pipe 19 and the water inlet ejector 18 may both be disposed in the reflux channel 5 .

[0040] The side-stream self-sustaining aerobic granular sludge device further comprises a sludge return pipe 20 , one end of which is connected to the light sludge collecting bucket 14 , and the other end of which is connected to the water inlet pipe 19 .

[0041] Among them, an inclined tube separation device 29 is also provided in the sedimentation area 4. The inclined tube separation device 29 is located upstream of the water outlet trough 30 and downstream of the light sludge collection bucket 14. After the water flows through the inclined tube separation device 29 for sedimentation and separation, the light sludge can fall into the light sludge collection bucket 14.

[0042] Among them, the side-stream self-sustaining aerobic granular sludge device also includes a water outlet trough 30, which can be located at the top of the sedimentation area 4. The water body after sedimentation and separation by the inclined tube separation device 29 enters the water outlet trough 30. The water outlet trough 30 is externally connected to a water outlet pipe 31, and the water body in the water outlet trough 30 can be discharged to the outside of the main body 1 through the water outlet pipe 31.

[0043] The side-stream self-sustaining aerobic granular sludge device further includes an exhaust pipe 32 , one end of which is connected to the bottom of the aerobic zone 2 , and the other end of which extends to the outside of the body 1 .

[0044] Among them, a guide reverse cone 24 can also be arranged in the body 1, and the guide reverse cone 24 is located below the reflux channel 5, and the interval between the second annular member 7 and the conical surface of the guide reverse cone 24 serves as the second notch 25. Due to the arrangement of the aerobic acceleration throat 11, it is more difficult for the water in the aerobic zone 2 to directly flow back to the premixing zone 21 from the first water return port 22. However, when the water in the aerobic zone 2 is released from the aerobic acceleration throat 11, a part of the water will enter the reflux channel 5, and the water falling in the reflux channel 5 can flow back to the premixing zone 21 again through the second notch 25 and the first water return port 22 under the guidance of the guide reverse cone 24.

[0045] When in use, the external sewage is accelerated by the water inlet ejector 18 and enters the water inlet pipe 19, and then enters the gas collecting tank 13 of the three-phase separator 16 through the water inlet branch pipe 27. The water in the aerobic zone 2 flows toward the sedimentation zone 4 under the action of the gas lift and hydraulic flow of the aerator 8. During the period, when passing through the three-phase separator 16, a part of the gas-water mixture enters the gas collecting tank 13 of the three-phase separator 16. The sludge in the water body is separated from the gas-water mixture after encountering the three-phase separator 16, and the sludge falls down into the aerobic zone 2. Among them, the nitrified liquid in the gas-water mixture entering the gas collecting tank 13 in the aerobic zone 2 is mixed with the sewage raw water in the gas collecting tank 13 and then transported to the anoxic zone 3 by the collecting pipe 17, and denitrification is carried out in the anoxic zone 3 to remove the total nitrogen in the sewage. After that, the falling water in the anoxic zone 3 enters the aerobic zone 2 from the first gap 23. In addition to flowing to the sedimentation zone 4, a part of the water in the aerobic zone 2 will enter the reflux channel 5 through the third notch 26, and then return to the aerobic zone 2 from the second notch 25 at the bottom of the reflux channel 5, and the cycle will be repeated to improve the mixing effect. The light sludge contained in the water entering the sedimentation zone 4 will be precipitated and separated after passing through the inclined tube separation device 29 and fall into the light sludge collection bucket 14. Under the action of negative pressure, the light sludge can flow back to the water inlet pipe 19 through the sludge return pipe 20, or can be discharged through the sludge discharge pipe 15.

[0046] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A side-stream self-sustaining aerobic granular sludge device, characterized in that: include: A main body (1), wherein at least an aerobic zone (2) is arranged in the main body (1); an aerator (8), arranged in the aerobic zone (2); A premixing hood (9) is arranged at the air outlet end of the aerator (8), and the space between the premixing hood (9) and the aerator (8) forms a premixing zone (21); a gap is left between the premixing hood (9) and the aerator (8) to form a first water return port (22), and the first water return port (22) communicates with the premixing zone (21) and the space outside the premixing zone (21); wherein the flow area of ​​the release port of the premixing hood (9) is smaller than the flow area of ​​the water inlet of the premixing hood (9), so as to increase the pressure in the premixing zone (21) under the aeration state.

2. The side-flow self-sustaining aerobic granular sludge device according to claim 1, characterized in that: It also includes a speed-retaining tube (10) disposed in the aerobic zone (2); One end of the speed-retaining tube (10) is connected to the release port of the premixing hood (9), and the other end extends in a direction away from the aerator (8), and the diameter of the speed-retaining tube (10) is equal to the diameter of the release port of the premixing hood (9).

3. The side-flow self-sustaining aerobic granular sludge device according to claim 2, characterized in that: It also includes an aerobic acceleration throat (11) disposed in the aerobic zone (2); One end of the aerobic accelerating throat pipe (11) is connected to an end of the speed-retaining pipe (10) away from the premixing cover (9), and the other end extends toward the downstream of the aerobic zone (2) to guide the water in the aerobic accelerating throat pipe (11) to flow toward the downstream of the aerobic zone (2).

4. The side-flow self-sustaining aerobic granular sludge device according to claim 1, characterized in that: It also includes an aerobic accelerating nozzle (12) disposed in the premixing zone (21); The large opening end of the aerobic accelerating nozzle (12) is arranged toward the aerator (8), and the small opening end of the aerobic accelerating nozzle (12) at least partially extends into the premixing cover (9).

5. The side-flow self-sustaining aerobic granular sludge device according to claim 1, characterized in that: An anoxic zone (3) and a precipitation zone (4) are also provided in the body (1), wherein the anoxic zone (3) is located upstream of the aerobic zone (2), and the precipitation zone (4) is located downstream of the aerobic zone (2); It also comprises a light sludge collecting bucket (14) which is arranged in the sedimentation area (4), and a sludge discharge pipe (15) extending to the outside of the main body (1) is arranged at the bottom of the light sludge collecting bucket (14).

6. The side-flow self-sustaining aerobic granular sludge device according to claim 5, characterized in that: It also includes a three-phase separator (16) which is arranged around the light sludge collecting bucket (14), and the gas collecting tank (13) of the three-phase separator (16) is connected to the anoxic zone (3) through a collecting pipe (17).

7. The side-flow self-sustaining aerobic granular sludge device according to claim 6, characterized in that: It also includes a water inlet pipe (19) and a water inlet ejector (18); The water inlet pipe (19) is arranged in the aerobic zone (2), and the top end of the water inlet pipe (19) is closed. The water inlet pipe (19) is connected to the gas collecting tank (13) of the three-phase separator (16) through the water inlet branch pipe (27); One end of the water inlet ejector (18) is used to communicate with an external sewage source, and the other end extends into the water inlet pipe (19).

8. The side-flow self-sustaining aerobic granular sludge device according to claim 7, characterized in that: A reflux channel (5) is provided at the center of the aerobic zone (2), and the inner and outer regions of the reflux channel (5) are connected so that part of the water in the aerobic zone (2) circulates between the aerobic zone (2) and the reflux channel (5).

9. The side-flow self-sustaining aerobic granular sludge device according to claim 8, characterized in that: The water inlet pipe (19) and the water inlet ejector (18) are both arranged in the reflux channel (5).

10. The side-flow self-sustaining aerobic granular sludge device according to claim 7, characterized in that: It also includes a sludge return pipe (20), one end of which is connected to the light sludge collection bucket (14) and the other end of which is connected to the water inlet pipe (19).

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