Lateral flow aerobic granular sludge device

Abstract

The utility model relates to the technical field of sewage treatment, and provides a side-flow aerobic granular sludge device which comprises a body, and an anoxic zone and an aerobic zone are at least arranged in the body; the upstream runner area of the aerobic zone is smaller than the downstream runner area; the inlet of the aerobic zone is communicated with the outlet of the anoxic zone, the outlet of the aerobic zone is divided into a first branch and a second branch, the first branch is communicated with the anoxic zone, and the second branch is communicated with the downstream process zone of the aerobic zone. According to the side-flow aerobic granular sludge device, a pump body does not need to be matched with a pipeline for nitrification liquid backflow, energy conservation and environmental protection are facilitated, and the burden of system maintenance is not increased. Moreover, during use, nitrification liquid and raw water are mixed at the upper part of the anoxic zone by utilizing disturbance of rising of tail gas of the aerobic zone, rise at the upper section of the anoxic zone, then fall back and are continuously stirred and mixed, so that the space utilization rate in the body is increased, the retention time of a water body can be effectively prolonged, and the sewage treatment effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a side-flow 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. There is a large amount of nitrification liquid in the downstream aerobic zone. Therefore, the nitrification liquid can be transported back to the upstream anoxic zone to remove the total nitrogen in the sewage through denitrification. In the prior art, a pump body is generally used in conjunction with a pipeline to reflux the nitrification liquid. However, such a design is not conducive to energy saving and environmental protection and will increase the burden of system maintenance. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is that the traditional aerobic reaction device uses a pump body and a pipeline to reflux the nitrification liquid. However, such a design is not conducive to energy saving and environmental protection and will increase the burden of system maintenance, thereby providing a side-flow 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-flow aerobic granular sludge device, comprising: a body, wherein at least an anoxic zone and an aerobic zone are arranged along a water flow path; the upstream flow channel area of ​​the aerobic zone is smaller than the downstream flow channel area, and an aeration device is arranged in the upstream flow channel of the aerobic zone; the inlet of the aerobic zone is connected with the outlet of the anoxic zone, and the outlet of the aerobic zone is divided into a first branch and a second branch, the first branch is connected with the anoxic zone, and the second branch is used to be connected with a downstream process zone of the aerobic zone; wherein the anoxic zone is connected with an external sewage source, and the external sewage flows into the aerobic zone after entering the anoxic zone, and the aerobic zone, under the action of the aeration device, utilizes the gas lift effect generated by the rising gas to transport the nitrified liquid in the aerobic zone to the anoxic zone through the first branch.

[0006] Furthermore, the upstream flow channel of the aerobic zone includes a connected premixing section and a speed-maintaining section, and the speed-maintaining section is located downstream of the premixing section; the flow channel area of ​​the premixing section gradually decreases in the direction approaching the speed-maintaining section, and the aeration device is arranged in the premixing section; a gap is left between one end of the premixing section away from the speed-maintaining section and the bottom of the main body, so that the water in the anoxic zone can enter the aerobic zone.

[0007] Furthermore, a first opening is provided between the aerobic zone and the anoxic zone, and a portion of the sludge in the aerobic zone enters the anoxic zone through the first opening.

[0008] Furthermore, an annular degassing channel and a sludge suspension zone are also provided along the water flow path in the body; the annular degassing channel is located downstream of the aerobic zone, and the inlet of the annular degassing channel is connected to the second branch; the outlet of the annular degassing channel is divided into a third branch and a fourth branch, a part of the water in the annular degassing channel enters the sludge suspension zone through the third branch, and another part of the water in the annular degassing channel flows back to the aerobic zone through the fourth branch.

[0009] Furthermore, the main body is a vertical tank structure with a circular or square cross-section, and the anoxic zone, aerobic zone, annular degassing channel and sludge suspension zone are concentrically distributed in the main body, and from the inside to the outside are the sludge suspension zone, annular degassing channel, aerobic zone and anoxic zone respectively.

[0010] Furthermore, a sedimentation zone is provided along the water flow path in the body, the sedimentation zone is located downstream of the sludge suspension zone, and the inlet of the sedimentation zone is connected to the outlet of the sludge suspension zone.

[0011] Furthermore, the side-stream aerobic granular sludge device also includes a water distribution bin, which is arranged in the main body, and the water distribution bin is arranged in a ring shape along the circumference of the anoxic zone. The inlet of the water distribution bin is suitable for being connected to an external sewage source, and the outlet of the water distribution bin is connected to the anoxic zone. The water distribution bin transports water to the anoxic zone by means of an annular water distribution.

[0012] Furthermore, the side-stream aerobic granular sludge device also includes a water inlet ejector, a water inlet pipe and a sludge return pipe; one end of the water inlet ejector is connected to the sewage source, and the other end extends into the water inlet pipe; the end of the water inlet pipe away from the water inlet ejector is connected to the water distribution bin; one end of the sludge return pipe is connected to the water inlet pipe, and the other end is connected to the sludge suspension zone, so as to utilize negative pressure to transport the heavy sludge in the sludge suspension zone to the anoxic zone.

[0013] Furthermore, the side-stream aerobic granular sludge device also includes a light sludge collecting bucket and a light sludge discharge pipe; the light sludge collecting bucket is arranged in the sedimentation area or the sludge suspension area, and is used to collect the light sludge in the sedimentation area or the sludge suspension area; one end of the light sludge discharge pipe is connected to the light sludge collecting bucket, and the other end is connected to the water inlet pipe, so as to utilize the negative pressure to transport the light sludge in the sludge suspension area to the anoxic area.

[0014] Furthermore, the water inlet pipe is located in the sludge suspension area, and the water inlet pipe is connected to the water distribution bin through a first water inlet branch pipe.

[0015] Furthermore, the aeration device includes: 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 first premixing zone; a gap is left between the premixing hood and the aerator to form a water return port, and the water return port connects the first premixing zone with the space outside the first 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 first premixing zone under the aeration state.

[0016] Furthermore, the aeration device also includes a fairing, which is arranged at the release port of the premixing hood, and the end of the fairing away from the premixing hood is a sealing structure, and the inner diameter of the fairing gradually decreases in the direction away from the premixing hood; the space between the fairing and the premixing hood forms a second premixing zone; a gap is left between the fairing and the premixing hood to form a diversion port, and the diversion port connects the second premixing zone with the space outside the second premixing zone.

[0017] Furthermore, a plurality of tooth-shaped openings are arranged at the edge of the fairing opening, and the plurality of tooth-shaped openings are distributed along the circumference of the fairing.

[0018] Furthermore, the aeration device further comprises a speed-retaining member, which is arranged between the premixing hood and the fairing, and one end of the speed-retaining member away from the fairing is connected to a release port of the premixing hood.

[0019] Furthermore, the aeration device also includes a baffle plate, which is arranged inside the fairing, and the plate surface of the baffle plate is arranged facing the outlet of the speed-retaining component.

[0020] Furthermore, the aeration device further comprises a speed-retaining member; one end of the speed-retaining member is connected to the release port of the premixing hood, and the other end of the speed-retaining member extends in a direction away from the premixing hood.

[0021] The technical solution of the utility model has the following advantages:

[0022] The utility model provides a side-flow aerobic granular sludge device. Under the action of the aeration device, the aerobic zone utilizes the gas lift effect generated by the rising gas to transport the nitrified liquid in the aerobic zone to the anoxic zone through the first branch. With such an arrangement, there is no need to use a pump body and pipeline to reflux the nitrified liquid, which is beneficial to energy conservation and environmental protection and does not increase the burden of system maintenance. Moreover, when in use, the nitrified liquid and the raw water utilize the disturbance of the rising tail gas in the aerobic zone to mix in the upper part of the anoxic zone, rise in the upper part of the anoxic zone, and then fall back, and are continuously stirred and mixed, which improves the space utilization rate in the body, and can also effectively prolong the water retention time, which is beneficial to improving the sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 It is a schematic diagram of a side-stream aerobic granular sludge device in one embodiment of the utility model;

[0025] Figure 2 It is a schematic diagram of a first water passage hole in a side-flow aerobic granular sludge device in one embodiment of the utility model;

[0026] Figure 3 It is a schematic diagram of a side-stream aerobic granular sludge device in another embodiment of the utility model;

[0027] Figure 4 It is a schematic diagram of the second water passage hole in the side-flow aerobic granular sludge device in one embodiment of the utility model;

[0028] Figure 5 It is a schematic diagram of a swirl guide plate in a side-flow aerobic granular sludge device in one embodiment of the utility model;

[0029] Figure 6 It is a schematic diagram of a water outlet tank in a side-stream aerobic granular sludge device in one embodiment of the utility model;

[0030] Figure 7 It is a schematic diagram of a side-stream aerobic granular sludge device in another embodiment of the utility model;

[0031] Figure 8 It is a schematic diagram of a side-stream aerobic granular sludge device in another embodiment of the utility model;

[0032] Fig. 9It is a schematic diagram of a side-stream aerobic granular sludge device in another embodiment of the utility model;

[0033] Fig.10 It is a schematic diagram of a side-stream aerobic granular sludge device in another embodiment of the utility model;

[0034] Fig.11 It is a schematic diagram of anoxic zone in a side-stream aerobic granular sludge device in one embodiment of the utility model;

[0035] Fig.12 It is a schematic diagram of a main body of a side-stream aerobic granular sludge device in another embodiment of the utility model;

[0036] Fig.13 It is a schematic diagram of a side-stream aerobic granular sludge device in an embodiment of the utility model when used in combination;

[0037] Fig.14 for Fig.13 A schematic diagram of one of the layout methods when the side stream aerobic granular sludge device is used in combination;

[0038] Fig.15 It is a schematic diagram of a side-stream aerobic granular sludge device in another embodiment of the utility model when used in combination;

[0039] Fig.16 for Fig.15 Schematic diagram of the position of the edge collecting bucket in the figure;

[0040] Fig.17 for Fig.15 A schematic diagram of one of the layout methods when the side stream aerobic granular sludge device is used in combination;

[0041] Fig.18 It is a schematic diagram of a side-flow aerobic granular sludge device in another embodiment of the present invention when the annular degassing channel does not reflux to the aerobic zone;

[0042] Fig.19 for Fig.18 Schematic diagram of the sludge discharge pipe set in the mesoaerobic zone;

[0043] Fig. 20 It is a schematic diagram of the annular degassing channel in the side-stream aerobic granular sludge device in another embodiment of the utility model adopting a bucket reflux method to reflux the aerobic zone;

[0044] Fig.21 for Fig. 20 Schematic diagram of the distribution of the reflow holes;

[0045] Fig. 22 It is a schematic diagram of an aeration device in one embodiment of the utility model;

[0046] Fig.23 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0047] Fig.24 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0048] Fig.25 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0049] Fig.26 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0050] Fig. 27 This is a schematic diagram of the placement of an aerator in one embodiment of the utility model;

[0051] Fig.28 It is a schematic diagram of a side-stream aerobic granular sludge device in another embodiment of the utility model;

[0052] Fig.29 It is a schematic diagram of a side-stream aerobic granular sludge device in another embodiment of the utility model;

[0053] Fig.30 This is a schematic diagram of a side-stream aerobic granular sludge device in another embodiment of the present invention.

[0054] Description of reference numerals:

[0055] 1. Main body; 2. Anoxic zone; 3. Aerobic zone; 4. Annular degassing channel; 5. Sludge suspension zone; 6. First annular member; 7. Second annular member; 8. Third annular member; 9. First notch; 10. Second notch; 11. Third notch; 12. Fourth notch; 13. First opening; 14. Second opening; 15. Aeration device; 16. Water distribution bin; 17. First water hole; 18. First pipe body; 19. Second pipe body; 20. Water inlet ejector; 21. Premixing section; 22. Speed-maintaining section; 23. Sludge return pipe; 24. Light sludge collecting bucket; 25. Light sludge discharge pipe; 26. Sludge discharge pipe; 27. Emptying pipe; 28. Outlet Trough; 29, water outlet pipe; 30, second water hole; 31, swirl guide plate; 32, sedimentation zone; 33, air collecting hood; 34, air collecting pipe; 35, exhaust pipe; 36, cylinder; 37, inclined tube separation device; 38, first water inlet branch; 39, reverse cone; 40, sewage treatment tank; 41, water inlet main pipe; 42, second water inlet branch; 43, edge collecting bucket; 44, aerator; 45, premixing hood; 46, first premixing zone; 47, return water inlet; 48, fairing; 49, second premixing zone; 50, speed-retaining part; 51, baffle; 52, toothed mouth; 53, diversion port; 54, annular water inlet pipe; 55, drainage plate. DETAILED DESCRIPTION

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] like Figure 1 As shown, this embodiment provides a side-flow aerobic granular sludge device, including a body 1, for example, the body 1 can be a vertical tank structure with a circular cross-section, and the body 1 is provided with concentrically distributed anoxic zone 2, aerobic zone 3, annular degassing channel 4 and sludge suspension zone 5, and from the inside to the outside are the sludge suspension zone 5, annular degassing channel 4, aerobic zone 3 and anoxic zone 2. Among them, the cross-sectional shape of the body 1 is not limited to a circle, and can also be a square, hexagon or other polygon.

[0061] Specifically, a first annular member 6 is provided in the body 1, and the area between the first annular member 6 and the inner wall of the body 1 forms an annular columnar anoxic zone 2. A second annular member 7 is also provided in the body 1, and the second annular member 7 is provided in the inner circle of the first annular member 6, and the area between the second annular member 7 and the first annular member 6 forms an annular columnar aerobic zone 3. A third annular member 8 is also provided in the body 1, and the third annular member 8 is provided in the inner circle of the second annular member 7, and the area between the third annular member 8 and the second annular member 7 forms an annular columnar degassing channel 4, and the inner circle aerobic zone 3 of the third annular member 8 is a cylindrical sludge suspension zone 5.

[0062] The outlet of the anoxic zone 2 is connected to the inlet of the aerobic zone 3, and the water flows through the anoxic zone 2 and enters the downstream aerobic zone 3. The outlet of the aerobic zone 3 is connected to the inlet of the annular degassing channel 4, and the water flows through the aerobic zone 3 and enters the downstream annular degassing channel 4. The outlet of the annular degassing channel 4 is connected to the inlet of the sludge suspension zone 5, and the water flows through the annular degassing channel 4 and enters the downstream sludge suspension zone 5.

[0063] For the anoxic zone 2 and the aerobic zone 3, a first opening 13 can be provided on the side wall of the first annular member 6. The first opening 13 can be provided on the side wall of the first annular member 6 near the top of the main body 1. During the rising process of the water in the aerobic zone 3, a part of the water can flow back to the anoxic zone 2 through the first opening 13. In this way, a part of the sludge in the aerobic zone 3 can flow back to the anoxic zone 2, promoting more nitrification liquid to overflow from the first notch 9 to the anoxic zone 2.

[0064] Moreover, a first gap 9 is left between the top of the first annular member 6 and the top wall of the body 1. When the nitrification liquid corresponding to the first branch in the aerobic zone 3 rises to the top of the aerobic zone 3, it can climb over the first annular member 6 and flow from the first gap 9 to the anoxic zone 2. A second gap 10 is left between the bottom of the first annular member 6 and the bottom wall of the body 1. When the water in the anoxic zone 2 drops to the bottom of the anoxic zone 2, the water can climb over the first annular member 6 and flow from the second gap 10 to the aerobic zone 3.

[0065] Among them, for the aerobic zone 3, the lower half of the aerobic zone 3 can be recessed toward the center of the aerobic zone 3, so that the upstream flow channel area of ​​the aerobic zone 3 is smaller than the downstream flow channel area. Further, the upstream flow channel of the aerobic zone 3 includes a connected premixing section 21 and a speed-maintaining section 22, and the speed-maintaining section 22 is located downstream of the premixing section 21; the flow channel area of ​​the premixing section 21 gradually decreases in the direction close to the speed-maintaining section 22, for example, the premixing section 21 can be designed as a conical structure, and the aeration device 15 is arranged in the premixing section 21; a second notch 10 and a fourth notch 12 are left between the end of the premixing section 21 away from the speed-maintaining section 22 and the bottom wall of the body 1, so that the water in the anoxic zone 2 and the annular degassing channel 4 can enter the aerobic zone 3. Among them, the downstream flow channel of the aerobic zone 3 is provided with a plurality of aeration devices 15. Under the action of air lift, the nitrified liquid in the aerobic zone 3 is transported to the anoxic zone 2 through the first branch and the first gap 9. Moreover, the rising velocity of the water body upstream of the aerobic zone 3 is high, and the downstream velocity is low, so that the raw water entering the aerobic zone 3 is quickly mixed and risen, and then comprehensively treated in the low-speed zone in the middle and upper part, which is beneficial to improving the sewage treatment effect.

[0066] In the side-stream aerobic granular sludge device provided in this embodiment, the aerobic zone 3, under the action of the aeration device 15, utilizes the gas lift effect generated by the rising gas to transport the nitrified liquid in the aerobic zone 3 to the anoxic zone 2 through the first branch. With such an arrangement, there is no need to use a pump body in conjunction with a pipeline to reflux the nitrified liquid, which is beneficial to energy conservation and environmental protection and does not increase the burden of system maintenance. Moreover, when in use, the nitrified liquid and the raw water utilize the disturbance of the rising tail gas in the aerobic zone 3 to mix in the upper part of the anoxic zone 2 (the area above the first notch 9), rise and fall in the upper section of the anoxic zone 2, and are continuously stirred and mixed, thereby improving the space utilization rate in the main body 1, and can also effectively extend the water retention time, which is beneficial to improving the sewage treatment effect.

[0067] Among them, for the aerobic zone 3, a third gap 11 is left between the top of the second annular member 7 and the top wall of the body 1. When the water corresponding to the second branch in the aerobic zone 3 rises to the top of the aerobic zone 3, it can climb over the second annular member 7 and flow from the third gap 11 to the annular degassing channel 4. A fourth gap 12 is left between the bottom end of the second annular member 7 and the bottom wall of the body 1. When the water corresponding to the fourth branch in the annular degassing channel 4 drops to the bottom of the annular degassing channel 4, it can climb over the second annular member 7 and flow from the fourth gap 12 to the aerobic zone 3. Moreover, since there is a narrow space in the aerobic zone 3, the rising velocity of gas and water is increased, and the reflux attraction of the water entering the second gap 10 and the fourth gap 12 is increased, so that the falling muddy water is quickly replenished to the aerobic zone 3.

[0068] Among them, for the sludge suspension zone 5, a second opening 14 can be provided on the side wall of the third ring member 8 close to the bottom wall of the main body 1, so that the water body corresponding to the third branch in the annular degassing channel 4 can enter the sludge suspension zone 5 located in the center, and the sludge in the water body entering the sludge suspension zone 5 continues to increase in the sludge suspension zone 5, and finally forms a suspended floc filter bed layer. The top of the third ring member 8 can extend to the top of the main body 1, and the bottom of the third ring member 8 is connected to the bottom wall of the main body 1, and the entire sludge suspension zone 5 extends from the bottom to the top of the main body 1. With this arrangement, the filtration height of the floc filter bed layer is much higher than before, the removal effect is better, the biochemical terminal control is stricter, and the filtration is more thorough, which is conducive to improving the sewage treatment effect.

[0069] like Figure 2 As shown, the side stream aerobic granular sludge device also includes a water distribution bin 16, and a V-shaped plate can be arranged on the side wall of the first annular member 6 facing the second annular member 7, and the V-shaped plate can be arranged along the circumference of the first annular member 6 for a circle, so that the space between the V-shaped plate and the first annular member 6 forms an annular water distribution bin 16. The sewage outside the body 1 can enter the water distribution bin 16 after the water body is accelerated by the water inlet pipe and the water inlet ejector 20. A first water through hole 17 can be arranged on the side wall of the water distribution bin 16 facing the anoxic zone 2, so that the water body in the water distribution bin 16 enters the anoxic zone 2 through the first water through hole 17. With such a configuration, the anoxic zone 2 adopts an annular water distribution, and the raw water and the nitrification liquid can be quickly mixed in the outer ring anoxic zone 2, and the denitrification reaction starts faster.

[0070] The first water hole 17 may be a triangular hole, a square hole, a circular hole or a hole of other shapes.

[0071] The side stream aerobic granular sludge device further includes a sludge return pipe 23, one end of which can be arranged at the bottom of the sludge suspension area 5, and the other end can be connected to the water inlet pipe. Under the action of negative pressure, the heavy sludge at the bottom of the sludge suspension area 5 can be introduced into the water inlet pipe, mixed with the sewage raw water outside the body 1, and then enter the water distribution tank 16. A sludge discharge pipe 26 can be connected to the sludge return pipe 23 to discharge the sludge in the sludge return pipe 23.

[0072] The side stream aerobic granular sludge device further includes a light sludge discharge pipe 25, one end of which can extend into the middle and upper part of the sludge suspension zone 5, and the other end of which extends to the outside of the body 1 and is connected to the water inlet pipe, so that the light sludge in the sludge suspension zone 5 can enter the water distribution bin 16. In this way, two sludge return points are set in the sludge suspension zone 5, and the heavy sludge flocs and the light sludge flocs can be returned to the anoxic zone 2 respectively.

[0073] The side stream aerobic granular sludge device further includes a water outlet trough 28, which can be located at the top of the sludge suspension zone 5. After being filtered in the sludge suspension zone 5, the water enters the water outlet trough 28. The water outlet trough 28 is externally connected to a plurality of water outlet pipes 29, and the water in the water outlet trough 28 can be discharged to the outside of the body 1 through the water outlet pipes 29. In this embodiment, the water outlet pipe 29 can be externally connected to a sedimentation tank to further perform sedimentation treatment on the water.

[0074] The side-stream aerobic granular sludge device further includes an exhaust pipe 27 , one end of which is connected to the bottom of the aerobic zone 3 , and the other end of which extends to the outside of the body 1 .

[0075] like Figure 3 As shown, in one embodiment, a sedimentation area 32 is also provided in the main body 1, and the sedimentation area 32 can be provided in the sludge suspension area 5 and located downstream of the sludge suspension area 5. A light sludge collecting bucket 24 is provided in the sedimentation area 32 for collecting light sludge, and one end of the light sludge discharge pipe 25 is connected to the light sludge collecting bucket 24, and the other end is connected to the water inlet pipe.

[0076] Among them, the sedimentation area 32 is also provided with an air collecting hood 33, an air collecting pipe 34 and an exhaust pipe 35. The air collecting hood 33 can be arranged on the outer wall of the light sludge collecting bucket 24 along the circumference of the light sludge collecting bucket 24. One end of the air collecting pipe 34 is connected to the inner space of the air collecting hood 33, and the other end is connected to the exhaust pipe 35. For example, the top of the body 1 is an open structure, and one end of the exhaust pipe 35 away from the air collecting pipe 34 can extend out of the water surface to discharge excess gas in the sedimentation area 32.

[0077] Among them, an inclined tube separation device 37 is also provided in the sedimentation area 32. The inclined tube separation device 37 is located upstream of the water outlet trough 28 and downstream of the light sludge collection bucket 24. After the water body is precipitated and separated by the inclined tube separation device 37, the water body enters the water outlet trough 28, and the light sludge can fall into the light sludge collection bucket 24.

[0078] A cylinder 36 may be provided in the sedimentation area 32, the cylinder 36 is provided concentrically with the main body 1, the lower end of the cylinder 36 extends to the light sludge collecting bucket 24, and the upper end extends to the top of the main body 1, and the light sludge may enter the light sludge collecting bucket 24 from the gap between the cylinder 36 and the light sludge collecting bucket 24. The oblique tube separation device 37 may be provided around the cylinder 36. The exhaust pipe 35 may extend to the top of the main body 1 through the inside of the cylinder 36.

[0079] like Figure 6 As shown, the water outlet groove 28 can be divided into an inner ring part and an outer ring part which are connected, wherein the inner ring part can be arranged along the circumference of the cylinder 36, and the outer ring part can be arranged along the circumference of the first ring member 6.

[0080] In one embodiment, the upper half of the third annular member 8 may be a bucket-shaped structure, so that the flow area of ​​the sedimentation zone 32 gradually increases from upstream to downstream, which is beneficial to improving the sedimentation separation effect.

[0081] like Fig.10 As shown, in one embodiment, one end of the air collecting pipe 34 away from the exhaust pipe 35 can extend into the sedimentation area 32 through the side wall of the light sludge collecting bucket 24.

[0082] Among them, the water inlet pipe can include a first tube body 18 and a second tube body 19, one end of the first tube body 18 is connected to the external sewage source, and the other end is connected to the water inlet ejector 20; one end of the second tube body 19 is covered at the water outlet of the water inlet ejector 20, and the other end extends into the water distribution tank 16.

[0083] In one embodiment, the second pipe body 19 is located outside the main body 1, and the light mud discharge pipe 25 and the sludge return pipe 23 are both connected to the second pipe body 19. This arrangement facilitates maintenance of the second pipe body 19.

[0084] like Figure 7 , Figure 8 As shown, in one embodiment, the second pipe body 19 is located inside the body 1. For example, the second pipe body 19 can be set in the inner circle of the third ring member 8, and then the water in the second pipe body 19 is sent to the water distribution bin 16 through the first water inlet branch pipe 38. At this time, the sludge return pipe 23 can also be set in the inner circle of the third ring member 8, with one end extending downward into the sludge suspension area 5, or extending upward into the sludge suspension area 5, or extending upward into the light sludge collection bucket 24, and the other end is connected to the second pipe body 19. When the sludge return pipe 23 extends into the light sludge collection bucket 24, the light sludge discharge pipe 25 is used to discharge sludge from the light sludge collection bucket 24.

[0085] like Fig. 9 As shown, in one embodiment, a sludge reversal cone 39 is provided at the bottom of the sludge suspension zone 5, and the second opening 14 can be the gap between the bottom of the third ring member 8 and the side wall of the sludge reversal cone 39. With such a configuration, a portion of the sludge can slide down the sludge reversal cone 39 under the action of gravity and return to the aerobic zone 3 through the fourth notch 12, so that the sludge concentration in the aerobic zone 3 is maintained within a certain range.

[0086] like Figure 4 , Figure 5As shown, in one embodiment, a second water hole 30 can be provided on the side wall of the first annular member 6 facing the anoxic zone 2, so that the nitrifying liquid in the aerobic zone 3 can enter the anoxic zone 2 through the second water hole 30. The second water hole 30 here has the same function as the first notch 9 in the above embodiment, both of which provide a channel for the nitrifying liquid to cross the zone.

[0087] like Fig.11 As shown, for example, a swirl guide plate 31 can also be set at the edge of the second water hole 30, that is, the swirl guide plate 31 is located in the anoxic zone 2, and the water in the area without the swirl guide plate 31 in the anoxic zone 2 can fall directly, and the area with the swirl guide plate 31 in the anoxic zone 2 can guide the gas in the water-gas mixture to move upward through the swirl guide plate 31, and guide the water to move downward at the same time, so as to separate the gas from the water as much as possible.

[0088] In one embodiment, the second opening 14 can be designed as a V-shaped or substantially V-shaped baffle channel, and the second opening 14 can also be designed as a toothed mouth, the purpose of which is to reduce the amount of sludge flowing into the sludge suspension zone 5 along with the water body, and ensure that a portion of the sludge in the annular degassing channel 4 can flow back into the aerobic zone 3.

[0089] like Fig.12 As shown, in one embodiment, the main body 1 may also be a vertical tank-shaped structure with a square cross-section.

[0090] During use: after the raw water enters the water distribution bin 16, it flows out from the outlet of the water distribution bin 16 and enters the anoxic zone 2. The water in the anoxic zone 2 enters the aerobic zone 3 through the second gap 10. The water flows upward under the action of air lift and plug flow. The nitrification liquid in the aerobic zone 3 enters the anoxic zone 2 through the first gap 9. After the nitrification liquid is mixed with the raw water in the anoxic zone 2, the total nitrogen in the sewage is removed by denitrification. The sludge in the aerobic zone 3 can enter the anoxic zone 2 through the first opening 13. The microorganisms in the sludge are in a hungry state. After entering the anoxic zone 2, the pollutants in the raw water can provide nutrients for the microorganisms, so that the microorganisms can reproduce and grow rapidly. The bacterial flocs gather together to form sludge flocs. After the sludge enters the aerobic zone 3, the pollutants are continuously consumed and are basically consumed near the first opening 13. The microorganisms in the hungry period enter the anoxic zone 2 again, and the cycle continues to repeat the above process. A portion of the water in the aerobic zone 3 enters the annular degassing channel 4 through the third notch 11, and then a portion of the water in the annular degassing channel 4 enters the sludge suspension zone 5 through the second opening 14, and another portion of the water in the annular degassing channel 4 flows back to the aerobic zone 3 through the fourth notch 12. The sludge in the water can form a floc filter bed layer in the sludge suspension zone 5 to filter the water flowing through, further purifying the water, and then the water enters the sedimentation zone 32, and after sedimentation and separation by the inclined tube separation device 37, enters the water outlet trough 28, and finally is discharged from the body 1 through the water outlet pipe 29.

[0091] like Fig.13 , Fig.14 As shown, in one embodiment, when the body 1 is a round tank structure, the side-stream aerobic granular sludge device in the present application can also be used as a sewage treatment module placed in a sewage treatment tank 40 for use. The body 1 no longer forms an anoxic zone 2 by setting the first annular member 6 and the inner wall of the body 1, but the sewage tank area around the side-stream aerobic granular sludge device is used as the anoxic zone 2, and the area between the second annular member 7 in the body 1 and the body 1 forms an aerobic zone 3. At this time, the aerobic zone 3 is located at the outermost ring of the body 1, and a gap is left between the bottom of the body 1 and the bottom of the sewage treatment tank 40, so that the water in the sewage treatment tank 40 can flow back to the aerobic zone 3 through the gap. Moreover, when in use, multiple sewage treatment modules can be used in combination. For example, every four sewage treatment modules can be distributed in the sewage treatment tank 40 in an array of 2 rows and 2 columns. At this time, a water inlet main pipe 41 can be used, and then four second water inlet branches 42 connected to the main pipe can be used to supply water to the water inlet pipes of the four sewage treatment modules respectively. When in use, the sewage enters the water distribution tank 16 and flows into the sewage treatment pool 40. Then, the water mixed with the nitrification liquid in the sewage treatment pool 40 enters the aerobic zone 3 from the gap between the bottom of the main body 1 and the bottom of the sewage treatment pool 40. The nitrification liquid in the aerobic zone 3 flows out of the main body 1 and enters the sewage treatment pool 40, and the water enters the downstream annular degassing channel 4. With such a configuration, a method of improving the quality of the existing pool structure can be provided without changing the original pool structure. The module placed in the pool body is used to form granular sludge in the main body 1 to treat the sewage, thereby achieving the improvement of the quality.

[0092] like Fig.15 , Fig.16 as well as Fig.17As shown, in one embodiment, when the body 1 is a rectangular tank structure, the side stream aerobic granular sludge device in the present application can also be used as a sewage treatment module and placed in a sewage treatment tank 40. The body 1 no longer forms an anoxic zone 2 by setting the first annular member 6 and the inner wall of the body 1, but the sewage tank area between two adjacent side stream aerobic granular sludge devices is used as the anoxic zone 2, and the area between the second annular member 7 in the body 1 and the body 1 forms an aerobic zone 3. At this time, the aerobic zone 3 is located at the outermost ring of the body 1, and a gap is left between the bottom of the body 1 and the bottom of the sewage treatment tank 40, so that the water in the sewage treatment tank 40 can flow back to the aerobic zone 3 through the gap. When in use, multiple sewage treatment modules can be used in combination. For example, a plurality of sewage treatment modules can be arranged in the same row and spaced and placed in the sewage treatment tank 40. At this time, a water inlet main pipe 41 can be used, and then a plurality of second water inlet branches 42 connected to the main pipe can be used to extend to the space between the two adjacent sewage treatment modules to supply water to the two adjacent sewage treatment modules. Moreover, the length of each second water inlet branch pipe 42 can be consistent with the length of the main body 1, so that the water distribution is more uniform. Moreover, two rows of water distribution holes inclined downward can be set on the second water inlet branch pipe 42, and the water distribution holes can be evenly distributed along the length direction of the main body 1, so that the water body can be directly mixed with the nitrification liquid from the aerobic zone 3 after being sprayed out. Among them, a plurality of sludge return pipes 23 can be set along the length direction of the main body 1, one end of the sludge return pipe 23 is located in the sedimentation area 32, and the other end is connected to the second water inlet branch pipe 42, so that the sludge inside the main body 1 can be returned to the sewage treatment tank 40. For example, side collecting buckets 43 can be set at both ends of the main body 1 for collecting light sludge, and a sludge discharge pipe 26 can be set at the bottom of the side collecting bucket 43 for reflux or discharge of sludge.

[0093] Among them, when the ammonia nitrogen in the raw water is high, the internal reflux volume of the aerobic zone 3 is large, and the aerobic zone 3 needs more processing load. The fourth notch 12 in the above embodiment can be used to connect the annular degassing channel 4 with the aerobic zone 3 to increase the reflux volume.

[0094] like Fig.18 As shown, in one embodiment, the fourth gap 12 is no longer left between the bottom end of the second annular member 7 and the bottom wall of the body 1, so that all the water in the annular degassing channel 4 enters the downstream sludge suspension area 5. This arrangement can be applied to the scene where the ammonia nitrogen content of the raw water is very low. Fig.19As shown, in this embodiment, a mud discharge pipe 26 can be arranged at the bottom of the sludge suspension zone and in the middle and lower part of the aerobic zone 3, wherein the mud discharge pipe 26 of the sludge suspension zone can be a conventional mud discharge pipe 26, one end of which extends into the bottom of the sludge suspension zone, and the other end extends to the outside of the body 1. For the mud discharge pipe 26 in the aerobic zone 3, the mud discharge pipe 26 can include a mud discharge main pipe and an annular mud discharge branch pipe, the annular mud discharge branch pipe is arranged in the aerobic zone 3, and a plurality of mud inlets are arranged on the pipe body of the mud discharge branch pipe, the mud discharge main pipe is connected with the mud discharge branch pipe, and extends to the outside of the body 1, and the sludge in the aerobic zone 3 is collected by the mud discharge branch pipe and then discharged through the mud discharge main pipe.

[0095] like Fig. 20 , Fig.21 As shown, in one embodiment, the fourth notch 12 can be a discontinuous design, that is, the fourth notch 12 can be a plurality of holes distributed on the side wall of the bottom end of the second annular member 7. For example, 12 holes can be arranged at intervals along the circumferential direction of the second annular member 7. Inclined plates can be arranged on both sides of each hole, one end of the inclined plate is connected to the hole, and the other end is connected to the third annular member 8 obliquely upward. Under the guidance of the inclined plate, the water in the annular degassing channel 4 is introduced into the aerobic zone 3 through the hole. Such a setting can be applicable to the scene where the ammonia nitrogen in the raw water is not very high.

[0096] like Fig. 22 As shown, the aeration device 15 includes: an aerator 44, which is arranged in the aerobic zone 3; wherein, a plurality of aerators 44 may be provided, and the aerators 44 may be arranged in a point-like manner in the aerobic zone 3, for example, a plurality of aerators 44 arranged in a point-like manner may be arranged in a ring. The aerators 44 may also be arranged in a strip-like manner in the aerobic zone 3, for example, a plurality of aerators 44 may be arranged in an array in rows or columns. The arrangement of the aerators 44 is not limited to the above two methods, and the actual arrangement of the aerators 44 may be designed as required. The premixing hood 45 is arranged at the outlet end of the aerator 44, and the space between the premixing hood 45 and the aerator 44 forms the first premixing zone 46; a gap is left between the premixing hood 45 and the aerator 44 to form a water return port 47, and the water return port 47 connects the first premixing zone 46 with the space outside the first premixing zone 46; wherein, the flow area of ​​the release port of the premixing hood 45 is smaller than the flow area of ​​the water inlet of the premixing hood 45, so as to increase the pressure in the first premixing zone 46 under the aerated state. For example, the premixing hood 45 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 45 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 45 can be welded to the side wall of the aerobic zone 3 by setting a connecting rod on the side wall; or it can be installed as an integrated structure with the air pipe bracket of the aerator 44 and fixed on the air pipe bracket of the aerator 44.

[0097] In the aeration device 15 provided in this embodiment, the aerator 44 releases air in the first premixing zone 46. Due to the rapid rise of bubbles, the water outside the first premixing zone 46 will be driven to enter the first premixing zone 46 through the return port 47. In addition, the release port just above the premixing cover 45 is reduced in diameter so that the pressure in the first premixing zone 46 increases, so that the bubbles and the water flowing back through the return port 47 are further mixed, and the mixing effect is better due to the increase in pressure. The mixed gas-water mixture is ejected through the release port and rises to the aerobic zone 3 outside the first premixing zone 46. With such a configuration, when the aeration device 15 is in use, the concentration of dissolved oxygen is increased by reflowing, mixing and pressurizing dissolved gas, and the efficiency is higher and more energy-saving under the same aeration conditions.

[0098] like Fig.23 As shown, the aeration device 15 further includes a fairing 48, which is arranged at the release port of the premixing hood 45, and the end of the fairing 48 away from the premixing hood 45 is a sealing structure, and the inner diameter of the fairing 48 gradually decreases in the direction away from the premixing hood 45; the space between the fairing 48 and the premixing hood 45 forms a second premixing zone 49; a gap is left between the fairing 48 and the premixing hood 45 to form a diversion port 53, and the diversion port 53 connects the second premixing zone 49 with the space outside the second premixing zone 49. Wherein, the fairing 48 can be welded to the side wall of the aerobic zone 3 by arranging a connecting rod on the side wall. For example, the fairing 48 can be a conical structure with the top of the cone on the top. For another example, the premixing hood 45 can also be a prismatic structure with a smaller top surface on the top. Wherein, the shape of the fairing 48 is adapted to the shape of the premixing hood 45. For example, when the premixing hood 45 is a truncated cone structure, the fairing 48 can be a conical structure. For example, when the premixing cover 45 is a prism-shaped structure, the fairing 48 can be a prismatic structure. When in use, the gas-water mixture in the first premixing zone 46 enters the second premixing zone 49 through the release port of the premixing cover 45, and the gas-water mixture in the second premixing zone 49 flows out through the diversion port 53 and is divided into two branches, one of which moves toward the return port 47 to form a cycle, and the other flows over the fairing 48 and flows downstream. Moreover, since the side wall of the fairing 48 is an inclined surface, a slope can be formed, and a part of the gas-water mixture will slide down along the slope and counter-mix with the rapidly rising gas-water mixture, thereby improving the mixing effect.

[0099] like Fig. 27As shown, a plurality of tooth-shaped openings 52 may be provided at the edge of the fairing 48, and the plurality of tooth-shaped openings 52 are distributed along the circumference of the fairing 48. Such a setting has two advantages: first, the tooth-shaped openings 52 can increase the mixing effect, because the flow velocities of the concave area and the convex area through the tooth-shaped openings 52 are different, which can increase the disturbance mixing effect; second, it has the function of cutting bubbles, which can make large bubbles become smaller bubbles, increase the contact area with water, and increase dissolved oxygen. In addition, the gas-water mixture has horizontal and downward reflux diversion momentum, which can further increase the mixing effect, and the downward diversion of the gas-water mixture will increase the mixing extension, prolong the effective contact time, and will not directly rise to the liquid surface.

[0100] like Fig.24 As shown, in one embodiment, the aeration device 15 further includes a speed-retaining member 50, which is disposed between the premixing hood 45 and the fairing 48, and one end of the speed-retaining member 50 away from the fairing 48 is connected to the release port of the premixing hood 45. For example, when the premixing hood 45 is a truncated cone structure, the speed-retaining member 50 may be a round tube. When the premixing hood 45 is a prism-shaped structure, the speed-retaining member 50 may be a square tube, so as to match the shape of the premixing hood 45. When in use, the gas-water mixture flowing out of the release port of the premixing hood 45 may enter the speed-retaining member 50, and the speed of the gas-water mixture in the speed-retaining member 50 changes little, and a high flow rate may be maintained, and then the gas-water mixture is released from the top outlet of the speed-retaining member 50 to the second premixing zone 49. In this arrangement, a section of the speed-retaining member 50 is added to the release port of the premixing hood 45, and this straight speed-retaining member 50 may keep the drainage force of the first premixing zone 46 relatively large. Because the speed-retaining component 50 increases the height of the release port of the premixing hood 45, the velocity of the gas-water mixture outside the premixing hood 45 is relatively low, and the velocity difference with the gas-water mixture in the first premixing zone 46 is relatively large, so the pressure difference is large. Compared with the case without the speed-retaining component 50, the velocity difference between the two is larger, so the drainage effect is better.

[0101] like Fig.25 As shown, the aeration device 15 further includes a baffle 51, which is arranged inside the fairing 48, and the plate surface of the baffle 51 is arranged opposite to the outlet of the speed-retaining member 50. When in use, the gas-water mixture released from the outlet at the top of the speed-retaining member 50 hits the baffle 51 and then diffuses to the surroundings. Such an arrangement can prevent the accumulation of gas bubbles at the top of the fairing 48, so that the gas is smoothly released into the water, thereby improving the gas-water mixing effect.

[0102] like Fig.26 As shown, in another embodiment, the aeration device 15 further includes a speed-retaining member 50 ; one end of the speed-retaining member 50 is connected to the release port of the premixing hood 45 , and the other end extends in a direction away from the premixing hood 45 .

[0103] like Fig.28As shown, in one embodiment, the side stream aerobic granular sludge device supplies water to the anoxic zone 2 through an annular water inlet pipe 54. The annular water inlet pipe 54 can be a tube with a circular end face. The annular water inlet pipe 54 is located outside the main body 1 and is arranged around the anoxic zone 2. The water in the second tube body 19 enters the annular water inlet pipe 54 and is then distributed to the anoxic zone 2.

[0104] like Fig.29 As shown, in one embodiment, the side stream aerobic granular sludge device supplies water to the anoxic zone 2 through an annular water inlet pipe 54. The annular water inlet pipe 54 can be a tube with an end face of half a regular hexagon. The annular water inlet pipe 54 is located inside the main body and is arranged around the anoxic zone 2. The water in the first water inlet branch pipe 38 enters the annular water inlet pipe 54 and is then distributed to the anoxic zone 2.

[0105] like Fig.30 As shown, in one embodiment, the side-stream aerobic granular sludge device divides the water into two parts by setting a guide plate 55 in the annular degassing channel 4, one part of the water flows back to the aerobic zone 3, and the other part of the water flows into the downstream sludge suspension zone 5. The position of the guide plate 55 can be adjusted according to actual needs, so that the water flowing back to the aerobic zone 3 is substantially flush with the position of the speed-retaining member 50 when entering the aerobic zone 3, which is conducive to improving the reflux effect.

[0106] 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 aerobic granular sludge device, characterized in that: include: A body (1), wherein the interior of the body (1) is provided with at least an anoxic zone (2) and an aerobic zone (3) arranged along a water flow path; The upstream flow channel area of ​​the aerobic zone (3) is smaller than the downstream flow channel area, and an aeration device (15) is arranged in the upstream flow channel of the aerobic zone (3); the inlet of the aerobic zone (3) is connected to the outlet of the anoxic zone (2), and the outlet of the aerobic zone (3) is divided into a first branch and a second branch, the first branch is connected to the anoxic zone (2), and the second branch is used to be connected to the downstream process zone of the aerobic zone (3); The anoxic zone (2) is connected to an external sewage source, and the external sewage flows into the anoxic zone (2) and then flows into the aerobic zone (3). Under the action of the aeration device (15), the aerobic zone (3) utilizes the gas lift effect generated by the rising gas to transport the nitrified liquid in the aerobic zone (3) to the anoxic zone (2) through the first branch.

2. The side-stream aerobic granular sludge device according to claim 1, characterized in that: The upstream flow channel of the aerobic zone (3) comprises a premixing section (21) and a speed-maintaining section (22) connected to each other, and the speed-maintaining section (22) is located downstream of the premixing section (21); The flow channel area of ​​the premixing section (21) gradually decreases in a direction approaching the speed-maintaining section (22), and the aeration device (15) is arranged in the premixing section (21); A gap is left between the end of the premixing section (21) away from the speed-maintaining section (22) and the bottom of the body (1), so that water in the anoxic zone (2) can enter the aerobic zone (3).

3. The side-stream aerobic granular sludge device according to claim 2, characterized in that: A first opening (13) is also provided between the aerobic zone (3) and the anoxic zone (2), and a portion of the sludge in the aerobic zone (3) enters the anoxic zone (2) through the first opening (13).

4. The side-stream aerobic granular sludge device according to claim 1, characterized in that: An annular degassing channel (4) and a sludge suspension area (5) are also provided along the water flow path in the body (1); The annular degassing channel (4) is located downstream of the aerobic zone (3), and the inlet of the annular degassing channel (4) is connected to the second branch; The outlet of the annular degassing channel (4) is connected to the sludge suspension area (5); Or the outlet of the annular degassing channel (4) is divided into a third branch and a fourth branch, a part of the water in the annular degassing channel (4) enters the sludge suspension zone (5) through the third branch, and another part of the water in the annular degassing channel (4) flows back to the aerobic zone (3) through the fourth branch.

5. The side-stream aerobic granular sludge device according to claim 4, characterized in that: The body (1) is a vertical tank-shaped structure with a circular or square cross-section. The anoxic zone (2), the aerobic zone (3), the annular degassing channel (4) and the sludge suspension zone (5) are concentrically distributed in the body (1), and from the inside to the outside, they are the sludge suspension zone (5), the annular degassing channel (4), the aerobic zone (3) and the anoxic zone (2).

6. The side-stream aerobic granular sludge device according to claim 4, characterized in that: A sedimentation zone (32) is also provided along the water flow path in the body (1); the sedimentation zone (32) is located downstream of the sludge suspension zone (5); and the inlet of the sedimentation zone (32) is connected to the outlet of the sludge suspension zone (5).

7. The side-stream aerobic granular sludge device according to claim 6, characterized in that: The invention also comprises a water distribution bin (16) which is arranged in the body (1) and is arranged in a ring shape along the circumference of the anoxic zone (2). The inlet of the water distribution bin (16) is suitable for being connected to an external sewage source, and the outlet of the water distribution bin (16) is connected to the anoxic zone (2). The water distribution bin (16) transports water to the anoxic zone (2) by means of an annular water distribution.

8. The side-stream aerobic granular sludge device according to claim 7, characterized in that: It also includes a water inlet ejector (20), a water inlet pipe and a sludge return pipe (23); One end of the water inlet ejector (20) is connected to the sewage source, and the other end extends into the water inlet pipe; One end of the water inlet pipe away from the water inlet ejector (20) is connected to the water distribution bin (16); One end of the sludge return pipe (23) is connected to the water inlet pipe, and the other end is connected to the sludge suspension zone (5), so as to utilize negative pressure to transport the heavy sludge in the sludge suspension zone (5) to the anoxic zone (2).

9. The side-stream aerobic granular sludge device according to claim 8, characterized in that: It also includes a light sludge collection bucket (24) and a light sludge discharge pipe (25); The light sludge collecting bucket (24) is arranged in the sedimentation area (32) or in the sludge suspension area (5) and is used to collect the light sludge in the sedimentation area (32) or in the sludge suspension area (5); One end of the light sludge discharge pipe (25) is connected to the light sludge collecting bucket (24), and the other end is connected to the water inlet pipe, so as to utilize negative pressure to transport the light sludge in the sludge suspension zone (5) to the anoxic zone (2).

10. The side-stream aerobic granular sludge device according to claim 8, characterized in that: The water inlet pipe is located in the sludge suspension area (5), and the water inlet pipe is connected to the water distribution bin (16) via a first water inlet branch pipe (38).

11. The side-stream aerobic granular sludge device according to claim 10, characterized in that: The aeration device (15) comprises: an aerator (44), arranged in the aerobic zone (3); A premixing hood (45) is arranged at the air outlet end of the aerator (44), and the space between the premixing hood (45) and the aerator (44) forms a first premixing zone (46); a gap is left between the premixing hood (45) and the aerator (44) to form a water return port (47), and the water return port (47) communicates with the first premixing zone (46) and the space outside the first premixing zone (46); wherein the flow area of ​​the release port of the premixing hood (45) is smaller than the flow area of ​​the water inlet of the premixing hood (45), so as to increase the pressure in the first premixing zone (46) under the aeration state.

12. The side-stream aerobic granular sludge device according to claim 11, characterized in that: It also includes a fairing (48) which is arranged at the release port of the premixing cover (45), the end of the fairing (48) away from the premixing cover (45) is a sealing structure, and the inner diameter of the fairing (48) gradually decreases in a direction away from the premixing cover (45); The space between the fairing (48) and the premixing cover (45) forms a second premixing zone (49); A gap is left between the fairing (48) and the premixing cover (45) to form a diversion port (53), and the diversion port (53) communicates with the second premixing zone (49) and a space outside the second premixing zone (49).

13. The side-stream aerobic granular sludge device according to claim 12, characterized in that: A plurality of tooth-shaped openings (52) are arranged at the edge of the fairing opening of the fairing (48), and the plurality of tooth-shaped openings (52) are distributed along the circumference of the fairing (48).

14. The side-stream aerobic granular sludge device according to claim 12, characterized in that: It also includes a speed-retaining component (50) disposed between the premixing cover (45) and the fairing (48), and one end of the speed-retaining component (50) away from the fairing (48) is connected to a release port of the premixing cover (45).

15. The side-stream aerobic granular sludge device according to claim 14, characterized in that: It also includes a baffle (51) which is arranged inside the fairing (48), and the plate surface of the baffle (51) is arranged facing the outlet of the speed-retaining component (50).

16. The side-stream aerobic granular sludge device according to claim 11, characterized in that: Also includes a speed-retaining member (50); One end of the speed-retaining member (50) is connected to the release port of the premixing cover (45), and the other end extends in a direction away from the premixing cover (45).

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