Self-sustained aerobic granular sludge device

Abstract

The utility model relates to the technical field of sewage treatment, and provides a self-sustaining aerobic granular sludge device which comprises a body which is of a horizontal tank-shaped structure, an anaerobic zone, an anoxic zone, an aerobic zone and a settling zone are sequentially arranged in the body along a water flowing path, an inlet of the body is positioned in the anaerobic zone, and an outlet of the body is positioned in the settling zone; the area of an upstream runner of the aerobic zone is smaller than that of a downstream runner, and an aeration device is arranged in the upstream runner of the aerobic zone; 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, a part of water in the aerobic zone enters the anoxic zone through the first branch, and the other part of water in the aerobic zone enters the settling zone through the second branch. According to the self-sustaining aerobic granular sludge device provided by the utility model, a pump body does not need to be matched with a pipeline to carry out nitrification liquid backflow, energy conservation and environmental protection are facilitated, and the burden of system maintenance is not increased.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a 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. 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, so a self-sustaining aerobic granular sludge device is provided.

[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 self-sustaining aerobic granular sludge device, comprising: a body, which is a horizontal tank-shaped structure, wherein an anaerobic zone, an anoxic zone, an aerobic zone and a sedimentation zone are sequentially arranged in the body along the water flow path, the inlet of the body is located in the anaerobic zone, and the outlet of the body is located in the sedimentation zone; 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 to the outlet of the anoxic zone, and the outlet of the aerobic zone is divided into a first branch and a second branch. A branch, a part of the water in the aerobic zone enters the anoxic zone through the first branch, and another part of the water in the aerobic zone enters the sedimentation zone through the second branch; wherein, the 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; a sludge discharge pipe, one end of which is connected to the bottom of the sedimentation zone, and the other end extends to the outside of the body, so as to discharge the waste sludge in the sedimentation zone.

[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 first 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, the self-sustaining aerobic granular sludge device also includes a first guide plate, which is obliquely arranged at the bottom of the anoxic zone, and the plate surface of the first guide plate faces the first notch to guide the water in the anoxic zone into the premixing section through the first notch.

[0008] Furthermore, an aerobic internal recirculation zone is also provided in the body, which is located between the aerobic zone and the sedimentation zone; another part of the water in the aerobic zone enters the internal recirculation zone in the aerobic zone through the second branch, and the outlet of the aerobic internal recirculation zone is divided into a third branch and a fourth branch, and a part of the water in the aerobic internal recirculation zone enters the sedimentation zone along the third branch; a second gap is left between the end of the premixing section away from the speed-maintaining section and the bottom of the body, and another part of the water in the aerobic internal recirculation zone flows back to the aerobic zone along the fourth branch.

[0009] Furthermore, a water passage is provided in the body, located between the aerobic internal recirculation zone and the sedimentation zone; the water passage includes at least one set of curved flow channels for guiding water to flow in opposite directions, and the water along the third branch enters the sedimentation zone through the water passage.

[0010] Furthermore, the self-sustaining aerobic granular sludge device also includes a second guide plate, which is obliquely arranged at the bottom of the aerobic internal recirculation zone, and the plate surface of the second guide plate faces the second notch to guide the water in the aerobic internal recirculation zone into the premixing section through the second notch.

[0011] Furthermore, the self-sustaining aerobic granular sludge device also includes a third guide plate, one end of which is connected to the upper edge of the inlet of the water passage, and the other end of which extends obliquely downward toward the side wall of the aerobic zone and leaves a third gap between the side wall of the aerobic zone.

[0012] Furthermore, an inclined tube separation device is provided in the sedimentation area, and the sludge in the water body forms a sludge filter layer in the sedimentation area. The water body is filtered through the sludge filter layer and then precipitated through the inclined tube separation device.

[0013] Furthermore, the self-sustaining aerobic granular sludge device also includes an outlet pipe, one end of which is located in the sedimentation area and the other end extends to the outside of the main body; the outlet pipe is located downstream of the inclined tube separation device, and a plurality of seepage holes are provided on the pipe body of the outlet pipe, and the water after sedimentation by the inclined tube separation device enters the outlet pipe through the seepage holes.

[0014] Furthermore, a residual sludge collecting bucket is arranged in the sedimentation area, one end of the sludge discharge pipe extends into the residual sludge collecting bucket, and the other end extends to the outside of the main body.

[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 self-sustaining aerobic granular sludge device provided by the utility model, under the action of the aeration device, utilizes the gas lift effect generated by the rising gas in the aerobic zone 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 are mixed, rise and fall between the aerobic zone and the anoxic zone, 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 self-sustaining aerobic granular sludge device in one embodiment of the utility model;

[0025] Figure 2 It is a schematic diagram of an aeration device in one embodiment of the utility model;

[0026] Figure 3 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0027] Figure 4 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0028] Figure 5 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0029] Figure 6 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0030] Figure 7 The figure is a schematic diagram of the placement of the aerator in one embodiment of the utility model.

[0031] Description of reference numerals:

[0032] 1. Main body; 2. Anaerobic zone; 3. Anoxic zone; 4. Aerobic zone; 5. Aerobic internal recirculation zone; 6. Sedimentation zone; 7. First baffle; 8. Second baffle; 9. Third baffle; 10. Fourth baffle; 11. First baffle; 12. Second baffle; 13. Third baffle; 14. Water passage; 15. First guide plate; 16. Second guide plate; 17. Third guide plate; 18. First notch; 19. Second notch; 20. Third notch; 21. Fourth notch 22. First water hole; 23. Second water hole; 24. Residual sludge collecting bucket; 25. Inclined tube separation device; 26. Water outlet pipe; 27. Mud discharge pipe; 28. Entrance of the main body; 29. ​​Aeration device; 30. Premixing section; 31. Speed-maintaining section; 32. Diversion port; 33. Aerator; 34. Premixing hood; 35. First premixing zone; 36. Return water port; 37. Fairing; 38. Second premixing zone; 39. Speed-maintaining part; 40. Baffle; 41. Tooth-shaped port. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] like Figure 1 As shown, this embodiment provides a self-sustaining aerobic granular sludge device, comprising: a body 1, which is a horizontal tank-shaped structure, wherein an anaerobic zone 2, an anoxic zone 3, an aerobic zone 4 and a sedimentation zone 6 are sequentially arranged in the body 1 along the water flow path, the inlet 28 of the body is located in the anaerobic zone 2, and the outlet of the body 1 is located in the sedimentation zone 6; the upstream flow channel area of ​​the aerobic zone 4 is smaller than the downstream flow channel area, and an aeration device 29 is arranged in the upstream flow channel of the aerobic zone 4; the inlet of the aerobic zone 4 is connected to the outlet of the anoxic zone 3, and the outlet of the aerobic zone 4 is divided into a first branch and a second branch. Two branches, a part of the water in the aerobic zone 4 enters the anoxic zone 3 through the first branch, and another part of the water in the aerobic zone 4 enters the sedimentation zone 6 through the second branch; wherein, after the sewage enters the anoxic zone 3, it flows to the aerobic zone 4, and under the action of the aeration device 29, the aerobic zone 4 utilizes the gas lift effect generated by the rising gas to transport the nitrified liquid in the aerobic zone 4 to the anoxic zone 3 through the first branch; a sludge discharge pipe 27, one end of which is connected to the bottom of the sedimentation zone 6, and the other end extends to the outside of the body 1, so as to discharge the waste sludge in the sedimentation zone 6.

[0038] In the self-sustaining aerobic granular sludge device provided in this embodiment, the aerobic zone 4, under the action of the aeration device 29, utilizes the gas lift effect generated by the rising gas to transport the nitrified liquid in the aerobic zone 4 to the anoxic zone 3 through the first branch. With such a configuration, there is no need to use a pump body and 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 are mixed, rise and fall between the aerobic zone 4 and the anoxic zone 3, and are continuously stirred and mixed, which improves 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.

[0039] Specifically, the self-sustaining aerobic granular sludge device includes a body 1, which may be a horizontal round tank structure, and a first baffle 7, a second baffle 8, a third baffle 9 and a fourth baffle 10 are sequentially arranged in the body 1 from left to right. The area between the first baffle 7 and the body 1 forms an anaerobic zone 2, the area between the first baffle 7 and the second baffle 8 forms an anoxic zone 3, the area between the second baffle 8 and the third baffle 9 forms an aerobic zone 4, the area between the third baffle 9 and the fourth baffle 10 forms an aerobic internal recirculation zone 5, and the area between the fourth baffle 10 and the body 1 forms a sedimentation zone 6. External sewage enters the anaerobic zone 2 from the inlet 28 of the body, and then passes through the anoxic zone 3, the aerobic zone 4, the aerobic internal recirculation zone 5 and the sedimentation zone 6 in sequence before being discharged from the outlet of the body 1.

[0040] Among them, for the first baffle 7, the bottom of the first baffle 7 is connected to the bottom of the body 1, and a fourth gap 21 is left between the top of the first baffle 7 and the top of the body 1, and the fourth gap 21 connects the anaerobic zone 2 with the anoxic zone 3. For example, the inlet 28 of the body can be located at the bottom of the anaerobic zone 2, and after the water enters the body 1, it flows from bottom to top in the anaerobic zone 2. When the water flows to the top of the anaerobic zone 2, it enters the anoxic zone 3 through the fourth gap 21, and then the water moves from bottom to top in the anoxic zone 3.

[0041] For the second partition 8, the top of the second partition 8 is connected to the top of the body 1, and a first gap 18 is left between the bottom of the second partition 8 and the bottom of the body 1, and the water in the anoxic zone 3 enters the aerobic zone 4 through the first gap 18. A first water hole 22 can be set on the plate surface of the second partition 8 near the top, so that the water (nitrification liquid) moving along the first branch in the aerobic zone 4 flows into the anoxic zone 3 through the first water hole 22.

[0042] For the third partition plate 9, the top of the third partition plate 9 is connected to the top of the body 1, and a second gap 19 is left between the bottom of the third partition plate 9 and the bottom of the body 1, and the water in the aerobic internal recirculation zone 5 enters the aerobic zone 4 from the second gap 19. A second water hole 23 can be provided on the plate surface of the third partition plate 9 near the top, so that the water moving along the second branch in the aerobic zone 4 flows into the aerobic internal recirculation zone 5 through the second water hole 23.

[0043] For the aerobic zone 4, the lower half of the second partition 8 and the third partition 9 can be recessed toward the center of the aerobic zone 4, so that the upstream flow channel area of ​​the aerobic zone 4 is smaller than the downstream flow channel area. The downstream flow channel of the aerobic zone 4 is provided with a plurality of aeration devices 29. Under the action of air lift, the nitrified liquid in the aerobic zone 4 is transported to the anoxic zone 3 through the first water hole 22. Moreover, the water body upstream of the aerobic zone 4 has a high rising velocity and a low downstream velocity, so that the raw water entering the aerobic zone 4 is quickly mixed and risen, and then is fully treated in the low-speed zone in the middle and upper part, which is conducive to improving the sewage treatment effect.

[0044] Furthermore, the upstream flow channel of the aerobic zone 4 includes a connected premixing section 30 and a speed-maintaining section 31, and the speed-maintaining section 31 is located downstream of the premixing section 30; the flow channel area of ​​the premixing section 30 gradually decreases in the direction close to the speed-maintaining section 31, for example, the premixing section 30 can be designed as a conical structure, and the aeration device 29 is arranged in the premixing section 30; a first notch 18 and a second notch 19 are left between the end of the premixing section 30 away from the speed-maintaining section 31 and the bottom wall of the body 1, so that the water in the anoxic zone 3 and the aerobic internal recirculation zone 5 can enter the aerobic zone 4. Such a configuration can increase the pressure difference between the inside and outside of the aerobic zone 4, improve the drainage force, and the drainage effect of the aerobic zone 4 from the first notch 18 and the second notch 19 is better.

[0045] Among them, since the third partition plate 9 is concave toward the center direction of the aerobic zone 4, the flow channel area of ​​the lower region of the aerobic zone 4 is smaller than the flow channel area of ​​the upper region, and at the same time, the downstream flow channel area of ​​the aerobic internal recirculation zone 5 is larger than the upstream flow channel area of ​​the aerobic internal recirculation zone 5. In this way, for the aerobic internal recirculation zone 5, the lower part becomes larger, the flow rate becomes slower, the gas release is better, and the degassing effect is good.

[0046] Among them, for the fourth partition 10, the top of the fourth partition 10 is connected to the top of the main body 1, the bottom of the fourth partition 10 is connected to the bottom of the main body 1, and an opening is set in the middle of the fourth partition 10 to connect the aerobic internal reflux zone 5 and the sedimentation zone 6, and the opening also serves as the entrance of the water passage 14.

[0047] Among them, the first baffle 11, the second baffle 12 and the third baffle 13 can be arranged on the side of the fourth baffle 10 facing the sedimentation zone 6, and the first baffle 11, the second baffle 12 and the third baffle 13 can all be V-shaped plates with an obtuse angle. Among them, one end of the first baffle 11 can be arranged at the upper edge of the entrance of the water passage 14, and the other end extends toward the bottom direction of the body 1. One end of the second baffle 12 can be connected to the bottom of the body 1, and the other end is higher than the first baffle 11 and extends obliquely upward toward the fourth baffle 10. One end of the third baffle 13 is higher than the second baffle 12 and connected to the fourth baffle 10, and the other end extends toward the bottom of the body 1. The water passage 14 is surrounded by the fourth baffle 10, the first baffle 11, the second baffle 12, the third baffle 13 and the bottom of the body 1, and the water passage 14 includes two groups of curved flow channels that can make the water body move in opposite directions. After the water enters the water passage 14, it flows downward under the guidance of the first baffle 11 and the fourth partition 10, then flows upward under the guidance of the first baffle 11 and the second baffle 12, then flows obliquely upward under the guidance of the first baffle 11 and the second baffle 12, then flows obliquely downward under the guidance of the second baffle 12 and the third baffle 13 and enters the bottom area of ​​the sedimentation zone 6.

[0048] The self-sustaining aerobic granular sludge device includes a first guide plate 15 which is tilted at the bottom of the anoxic zone 3 , and the plate surface of the first guide plate 15 faces the first notch 18 to guide the water in the anoxic zone 3 into the premixing section 30 through the first notch 18 .

[0049] The self-sustaining aerobic granular sludge device further includes a second guide plate 16 which is obliquely arranged at the bottom of the aerobic internal recirculation zone 5 , and the plate surface of the second guide plate 16 faces the second notch 19 to guide the water in the aerobic internal recirculation zone 5 into the premixing section 30 through the second notch 19 .

[0050] Among them, the self-sustaining aerobic granular sludge device also includes a third guide plate 17, which is arranged on the side of the fourth baffle 10 facing the aerobic internal recirculation zone 5, and one end of the third guide plate 17 is connected to the upper edge of the entrance of the water passage 14, and the other end extends obliquely downward toward the third baffle 9 and leaves a third gap 20 between the third baffle 9. The role has been described above. The space enlargement between 17 and 16 also has a pre-settling effect. For example, the third guide plate 17 can be arranged parallel to the second guide plate 16. In this way, under the guidance of the third guide plate 17, the water body moves in the direction close to the second gap 19, so that the water body in the aerobic internal recirculation zone 5 first meets the aerobic zone 4. Moreover, under the guidance of the third guide plate 17, the sludge in the aerobic internal recirculation zone 5 also flows back to the aerobic zone 4 first, so that the amount of sludge entering the sedimentation zone 6 is less than the amount of sludge entering the aerobic zone 4, and the sludge concentration in the sedimentation zone 6 is small, which can reduce the sedimentation load. In addition, the enlarged space between the third guide plate 17 and the second guide plate 16 can also play a role of pre-settling.

[0051] The top of the sedimentation area 6 is provided with an inclined tube separation device 25, and the sludge in the water body forms a sludge filter layer in the sedimentation area 6. The water body is filtered through the sludge filter layer and then precipitated through the inclined tube separation device 25. For example, the top of the sedimentation area 6 may not be provided with the inclined tube separation device 25, and the water body can be directly discharged after being filtered through the sludge filter layer.

[0052] Among them, the self-sustaining aerobic granular sludge device also includes an outlet pipe 26, one end of which is located in the sedimentation area 6 and the other end extends to the outside of the main body 1; the outlet pipe 26 is located downstream of the inclined tube separation device 25, and a plurality of seepage holes are arranged on the pipe body of the outlet pipe 26. The water body after sedimentation by the inclined tube separation device 25 enters the outlet pipe 26 through the seepage holes.

[0053] A residual sludge collecting bucket 24 is provided in the sedimentation area 6 , one end of the sludge discharge pipe 27 extends into the residual sludge collecting bucket 24 , and the other end extends to the outside of the main body 1 .

[0054] like Figure 2As shown, the aeration device 29 includes: an aerator 33, which is arranged in the aerobic zone 4 that needs aeration; wherein, a plurality of aerators 33 may be provided, and the aerators 33 may be arranged in a point-like manner in the aerobic zone 4, for example, a plurality of aerators 33 arranged in a point-like manner may be arranged in a ring. The aerators 33 may also be arranged in a strip-like manner in the aerobic zone 4, for example, a plurality of aerators 33 may be arranged in an array in rows or columns. The arrangement of the aerators 33 is not limited to the above two methods, and the actual arrangement of the aerators 33 may be designed as required. The premixing hood 34 is arranged at the outlet end of the aerator 33, and the space between the premixing hood 34 and the aerator 33 forms the first premixing zone 35; a gap is left between the premixing hood 34 and the aerator 33 to form a water return port 36, and the water return port 36 connects the first premixing zone 35 with the space outside the first premixing zone 35; wherein, the flow area of ​​the release port of the premixing hood 34 is smaller than the flow area of ​​the water inlet of the premixing hood 34, so as to increase the pressure in the first premixing zone 35 under the aeration state. For example, the premixing hood 34 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 34 can also be a prism-shaped 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 34 can be welded to the side wall of the aerobic zone 4 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 33 and fixed on the air pipe bracket of the aerator 33.

[0055] The aeration device 29 provided in this embodiment has an aerator 33 that releases air in the first premixing zone 35. As the bubbles rise rapidly, the water outside the first premixing zone 35 is driven to enter the first premixing zone 35 through the water return port 36. In addition, the release port just above the premixing cover 34 is reduced in diameter, so that the pressure in the first premixing zone 35 increases, so that the bubbles are further mixed with the water flowing back through the water return port 36, 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 4 outside the first premixing zone 35. With such a configuration, when the aeration device 29 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.

[0056] like Figure 3As shown, the aeration device 29 further comprises a fairing 37, which is arranged at the release port of the premixing hood 34, and the end of the fairing 37 away from the premixing hood 34 is a sealing structure, and the inner diameter of the fairing 37 gradually decreases in the direction away from the premixing hood 34; the space between the fairing 37 and the premixing hood 34 forms a second premixing zone 38; a gap is left between the fairing 37 and the premixing hood 34 to form a diversion port 32, and the diversion port 32 connects the second premixing zone 38 with the space outside the second premixing zone 38. Wherein, the fairing 37 can be welded to the side wall of the aerobic zone 4 by arranging a connecting rod on the side wall. For example, the fairing 37 can be a conical structure with the top of the cone on the top. For another example, the premixing hood 34 can also be a prismatic structure with a smaller top surface on the top. Wherein, the shape of the fairing 37 is adapted to the shape of the premixing hood 34, for example, when the premixing hood 34 is a truncated cone structure, the fairing 37 can be a conical structure. For example, when the premixing cover 34 is a prism-shaped structure, the fairing 37 can be a prism-shaped structure. When in use, the gas-water mixture in the first premixing zone 35 enters the second premixing zone 38 through the release port of the premixing cover 34, and the gas-water mixture in the second premixing zone 38 flows out through the diversion port 32 and is divided into two branches, one of which moves toward the return water port 36 to form a cycle, and the other flows over the fairing 37 and flows downstream. Moreover, since the side wall of the fairing 37 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.

[0057] like Figure 7 As shown, a plurality of tooth-shaped openings 41 can be provided at the edge of the fairing 37, and the plurality of tooth-shaped openings 41 are distributed along the circumference of the fairing 37. Such a setting has two advantages: first, the tooth-shaped openings 41 can increase the mixing effect, because the flow velocities of the concave area and the convex area through the tooth-shaped openings 41 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 a 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.

[0058] like Figure 4As shown, in one embodiment, the aeration device 29 further includes a speed-retaining member 39, which is disposed between the premixing hood 34 and the fairing 37, and one end of the speed-retaining member 39 away from the fairing 37 is connected to the release port of the premixing hood 34. For example, when the premixing hood 34 is a truncated cone structure, the speed-retaining member 39 may be a round tube. When the premixing hood 34 is a prism-shaped structure, the speed-retaining member 39 may be a square tube, so as to match the shape of the premixing hood 34. When in use, the gas-water mixture flowing out of the release port of the premixing hood 34 may enter the speed-retaining member 39, and the speed of the gas-water mixture in the speed-retaining member 39 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 39 to the second premixing zone 38. In this arrangement, a section of the speed-retaining member 39 is added to the release port of the premixing hood 34, and this straight speed-retaining member 39 may keep the drainage force of the first premixing zone 35 relatively large. Because the speed-retaining member 39 increases the height of the release port of the premixing hood 34, the velocity of the gas-water mixture outside the premixing hood 34 is relatively low, and the velocity difference with the gas-water mixture in the first premixing zone 35 is relatively large, so the pressure difference is large. Compared with the case without the speed-retaining member 39, the velocity difference between the two is greater, so the drainage effect is better.

[0059] like Figure 5 As shown, the aeration device 29 further includes a baffle 40, which is arranged inside the fairing 37, and the plate surface of the baffle 40 is arranged opposite to the outlet of the speed-retaining member 39. When in use, the gas-water mixture released from the outlet at the top of the speed-retaining member 39 hits the baffle 40 and then diffuses to the surroundings. Such a setting can prevent the accumulation of air bubbles on the top of the fairing 37, so that the gas is smoothly released into the water, thereby improving the gas-water mixing effect.

[0060] like Figure 6 As shown, in another embodiment, the aeration device 29 further includes a speed-retaining member 39 ; one end of the speed-retaining member 39 is connected to the release port of the premixing hood 34 , and the other end extends in a direction away from the premixing hood 34 .

[0061] 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 self-sustaining aerobic granular sludge device, characterized in that: include: The body (1) is a horizontal tank-shaped structure, wherein an anaerobic zone (2), an anoxic zone (3), an aerobic zone (4) and a sedimentation zone (6) are sequentially arranged in the body (1) along the water flow path, the inlet (28) of the body is located in the anaerobic zone (2), and the outlet of the body (1) is located in the sedimentation zone (6); The upstream flow channel area of ​​the aerobic zone (4) is smaller than the downstream flow channel area, and an aeration device (29) is provided in the upstream flow channel of the aerobic zone (4); the inlet of the aerobic zone (4) is connected to the outlet of the anoxic zone (3), and the outlet of the aerobic zone (4) is divided into a first branch and a second branch, a part of the water in the aerobic zone (4) enters the anoxic zone (3) through the first branch, and another part of the water in the aerobic zone (4) enters the sedimentation zone (6) through the second branch; The sewage enters the anoxic zone (3) and flows to the aerobic zone (4). Under the action of the aeration device (29), the aerobic zone (4) utilizes the gas lift effect generated by the rising gas to transport the nitrified liquid in the aerobic zone (4) to the anoxic zone (3) through the first branch.

2. The self-sustaining aerobic granular sludge device according to claim 1, characterized in that: The upstream flow channel of the aerobic zone (4) comprises a premixing section (30) and a speed-maintaining section (31) connected to each other, and the speed-maintaining section (31) is located downstream of the premixing section (30); The flow channel area of ​​the premixing section (30) gradually decreases in a direction approaching the speed-maintaining section (31), and the aeration device (29) is arranged in the premixing section (30); A first gap (18) is left between one end of the premixing section (30) away from the speed-maintaining section (31) and the bottom of the body (1), so that water in the anoxic zone (3) can enter the aerobic zone (4).

3. The self-sustaining aerobic granular sludge device according to claim 2, characterized in that: It also includes a first guide plate (15) which is obliquely arranged at the bottom of the anoxic zone (3), and the plate surface of the first guide plate (15) faces the first notch (18) to guide the water in the anoxic zone (3) into the premixing section (30) through the first notch (18).

4. The self-sustaining aerobic granular sludge device according to claim 2, characterized in that: The body (1) is also provided with an aerobic internal recirculation zone (5), which is located between the aerobic zone (4) and the precipitation zone (6); Another part of the water in the aerobic zone (4) enters the internal recirculation zone of the aerobic zone (4) through the second branch, the outlet of the aerobic internal recirculation zone (5) is divided into a third branch and a fourth branch, and a part of the water in the aerobic internal recirculation zone (5) enters the sedimentation zone (6) along the third branch; A second gap (19) is left between one end of the premixing section (30) away from the speed-maintaining section (31) and the bottom of the body (1), and another part of the water in the aerobic internal recirculation zone (5) flows back to the aerobic zone (4) along the fourth branch.

5. The self-sustaining aerobic granular sludge device according to claim 4, characterized in that: The body (1) is also provided with a water passage (14), which is located between the aerobic internal recirculation zone (5) and the precipitation zone (6); The water passage (14) comprises at least one set of curved flow channels for guiding water to flow in opposite directions, and the water along the third branch enters the sedimentation area (6) through the water passage (14).

6. The self-sustaining aerobic granular sludge device according to claim 4, characterized in that: The invention also comprises a second guide plate (16) which is obliquely arranged at the bottom of the aerobic internal recirculation zone (5), and the plate surface of the second guide plate (16) faces the second notch (19) so as to guide the water in the aerobic internal recirculation zone (5) into the premixing section (30) through the second notch (19).

7. The self-sustaining aerobic granular sludge device according to claim 5, characterized in that: It also comprises a third guide plate (17), one end of which is connected to the upper edge of the inlet of the water passage (14), and the other end of which extends obliquely downward toward the side wall of the aerobic zone (4) and leaves a third gap (20) between the side wall of the aerobic zone (4).

8. The self-sustaining aerobic granular sludge device according to claim 1, characterized in that: An inclined tube separation device (25) is provided in the sedimentation zone (6), and the sludge in the water body forms a sludge filter layer in the sedimentation zone (6). After the water body is filtered through the sludge filter layer, it is precipitated through the inclined tube separation device (25).

9. The self-sustaining aerobic granular sludge device according to claim 8, characterized in that: It also includes a water outlet pipe (26), one end of which is located in the sedimentation area (6) and the other end of which extends to the outside of the body (1); The water outlet pipe (26) is located downstream of the inclined tube separation device (25), and a plurality of water seepage holes are arranged on the pipe body of the water outlet pipe (26). The water body after being precipitated by the inclined tube separation device (25) enters the water outlet pipe (26) through the water seepage holes.

10. The self-sustaining aerobic granular sludge device according to claim 1, characterized in that: A residual sludge collecting bucket (24) is provided in the sedimentation area (6), one end of a sludge discharge pipe (27) extends into the residual sludge collecting bucket (24), and the other end extends to the outside of the main body (1).

11. The self-sustaining aerobic granular sludge device according to claim 1, characterized in that: The aeration device (29) comprises: an aerator (33), arranged in the aerobic zone (4); A premixing hood (34) is arranged at the air outlet end of the aerator (33), and the space between the premixing hood (34) and the aerator (33) forms a first premixing zone (35); a gap is left between the premixing hood (34) and the aerator (33) to form a water return port (36), and the water return port (36) communicates the first premixing zone (35) with the space outside the first premixing zone (35); wherein the flow area of ​​the release port of the premixing hood (34) is smaller than the flow area of ​​the water inlet of the premixing hood (34), so as to increase the pressure in the first premixing zone (35) under the aeration state.

12. The self-sustaining aerobic granular sludge device according to claim 11, characterized in that: It also includes a fairing (37) which is arranged at the release port of the premixing cover (34), the end of the fairing (37) away from the premixing cover (34) is a sealing structure, and the inner diameter of the fairing (37) gradually decreases in a direction away from the premixing cover (34); The space between the fairing (37) and the premixing cover (34) forms a second premixing zone (38); A gap is left between the fairing (37) and the premixing cover (34) to form a flow splitter (32), and the flow splitter (32) communicates with the second premixing zone (38) and a space outside the second premixing zone (38).

13. The self-sustaining aerobic granular sludge device according to claim 12, characterized in that: A plurality of tooth-shaped openings (41) are arranged at the edge of the fairing opening of the fairing (37), and the plurality of tooth-shaped openings (41) are distributed along the circumference of the fairing (37).

14. The self-sustaining aerobic granular sludge device according to claim 12, characterized in that: It also includes a speed-retaining member (39) disposed between the premixing cover (34) and the fairing (37), and one end of the speed-retaining member (39) away from the fairing (37) is connected to a release port of the premixing cover (34).

15. The self-sustaining aerobic granular sludge device according to claim 14, characterized in that: It also includes a baffle (40) which is arranged inside the fairing (37), and the plate surface of the baffle (40) is arranged facing the outlet of the speed-retaining component (39).

16. The self-sustaining aerobic granular sludge device according to claim 11, characterized in that: Also includes a speed-retaining member (39); One end of the speed-retaining member (39) is connected to the release port of the premixing cover (34), and the other end extends in a direction away from the premixing cover (34).

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