Assembly type aerobic granular sludge reaction device

Abstract

The utility model relates to the technical field of sewage treatment, and provides an assembly type aerobic granular sludge reaction device which comprises a body, and an anoxic zone, an aerobic zone and a settling zone which are sequentially arranged in the body along a water body flowing path, the water body accelerating device is arranged in the anoxic zone; a gap is reserved between the bottom of the throat pipe and the bottom of the anoxic zone to form a first water return port; one end of the sludge return pipe is communicated with the settling zone, and the other end of the sludge return pipe is communicated with the throat pipe. According to the assembled aerobic granular sludge reaction device provided by the utility model, a negative pressure environment is formed in the throat pipe of the anoxic zone, and the sludge in the settling zone is conveyed into the anoxic zone through the sludge return pipe by utilizing the self weight of the sludge in the settling zone and matching with the negative pressure in the throat pipe; compared with the prior art in which a pump body is matched with a pipeline for sludge backflow, the sludge backflow device is more energy-saving and environment-friendly, maintenance of the pump body does not need to be considered, and the burden of system maintenance can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an assembled aerobic granular sludge reaction 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 sludge in the sedimentation zone. Therefore, a part of the sludge with good sedimentation and low oxygen content can be transported back to the anoxic zone to supplement the sludge (microorganisms) in the anoxic zone. In the prior art, a pump body is generally used in conjunction with a pipeline for sludge reflux. 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 return the sludge. However, such a design is not conducive to energy saving and environmental protection and will increase the burden of system maintenance, thereby providing an aerobic granular sludge granulation device and a sewage treatment system.

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

[0005] The utility model provides an assembled aerobic granular sludge reaction device, comprising: a body, and anoxic zones, aerobic zones and sedimentation zones arranged in the body in sequence along a water flow path; a water acceleration device arranged in the anoxic zone, the water acceleration device comprising a water inlet ejector and a throat, the inlet of the water inlet ejector being suitable for being connected with an external sewage source, the water inlet ejector at least partially extending into the throat; a gap is left between the bottom of the throat and the bottom of the anoxic zone to form a first water return port; the water is released into the anoxic zone after being accelerated by the water inlet ejector and the throat, so that a negative pressure environment is formed in the throat; a part of the water in the anoxic zone flows back into the throat through the first water return port; a sludge return pipe, one end of which is connected with the sedimentation zone, and the other end of which is connected with the throat, so as to utilize the negative pressure in the throat to transport the sludge in the sedimentation zone to the anoxic zone.

[0006] Furthermore, the assembled aerobic granular sludge reaction device also includes a sludge hopper connected to one end of the sludge return pipe located in the sedimentation zone, and the opening of the sludge hopper is arranged upward and located in the lower half of the sedimentation zone.

[0007] Furthermore, the assembled aerobic granular sludge reaction device also includes an aerobic degassing channel, which is arranged in the main body, the inlet of the aerobic degassing channel is connected with the outlet of the aerobic zone, and the outlet of the aerobic degassing channel is divided into a first branch and a second branch. A part of the water in the aerobic degassing channel enters the sedimentation zone along the first branch, and another part of the water in the aerobic degassing channel flows back to the aerobic zone along the second branch.

[0008] Furthermore, a sludge return chute is provided at the bottom of the sedimentation zone, and the sludge return chute is connected with the aerobic degassing channel and the aerobic zone; the water from the first branch enters the sedimentation zone through the sludge return chute; part of the sludge in the sedimentation zone slides down through the sludge return chute and mixes with the water from the second branch before returning to the aerobic zone.

[0009] Furthermore, the assembled aerobic granular sludge reaction device also includes a nitrification liquid reflux pipe, one end of which is connected to the aerobic degassing channel and the other end of which is connected to the water inlet ejector, so that the nitrification liquid in the aerobic degassing channel refluxes to the anoxic zone.

[0010] Further, the downstream flow channel area of ​​the aerobic degassing channel is larger than the upstream flow channel area;

[0011] The nitrification liquid reflux pipe is located in the downstream flow channel of the aerobic degassing channel, and the pipe opening of the nitrification liquid reflux pipe is arranged downward.

[0012] Furthermore, the anoxic zone includes a primary anoxic zone and a secondary anoxic zone which are connected; the water acceleration device is arranged in the primary anoxic zone; and the secondary anoxic zone is connected to the aerobic zone.

[0013] Furthermore, a plurality of first mud slides are arranged at intervals on the inner wall at the bottom of the first-level anoxic zone, and each of the first mud slides is inclined toward the direction of the first water return port to guide the water body to move toward the first water return port; a water hole is arranged on the side wall of the first-level anoxic zone between two upper and lower adjacent first mud slides, and the water hole is arranged close to the upper first mud slide; a guide plate is arranged on the outer wall at the bottom of the first-level anoxic zone, the position of the guide plate is adapted to the position of the water hole, and the bottom of the guide plate does not contact the bottom of the secondary anoxic zone; the water body in the first-level anoxic zone enters the secondary anoxic zone through the water hole, and flows to the bottom of the secondary anoxic zone under the action of the guide plate, and then the water body turns over the guide plate and flows upward.

[0014] Furthermore, the assembled aerobic granular sludge reaction device also includes a diversion channel, one end of which is connected to the secondary anoxic zone and the other end is connected to the aerobic zone, so that the water in the secondary anoxic zone enters the aerobic zone through the diversion channel; the downstream flow channel area of ​​the diversion channel is larger than the upstream flow channel area.

[0015] Furthermore, the upstream flow channel area of ​​the aerobic zone is larger than the downstream flow channel area, and the aeration device in the aerobic zone is arranged in the upstream flow channel of the aerobic zone.

[0016] Furthermore, the aeration device includes: an aerator, which is used to be arranged in an aerobic zone that requires aeration; 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 second water return port, and the second 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 aerated state.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] The technical solution of the utility model has the following advantages:

[0023] The assembled aerobic granular sludge reaction device provided by the utility model forms a negative pressure environment in the throat of the anoxic zone, and utilizes the dead weight of the sludge in the sedimentation zone and the negative pressure in the throat to transport the sludge in the sedimentation zone to the anoxic zone through the sludge return pipe. Compared with the prior art that uses a pump body and pipeline to return sludge, it is more energy-saving and environmentally friendly, and there is no need to consider the maintenance of the pump body, which can reduce the burden of system maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 It is a schematic diagram of an assembled aerobic granular sludge reaction device in an embodiment of the utility model;

[0026] Figure 2 It is a schematic diagram of the nitrification liquid return pipe in the assembled aerobic granular sludge reaction device in the embodiment of the utility model;

[0027] Figure 3 It is a schematic diagram of the sludge return pipe in the assembled aerobic granular sludge reaction device in the embodiment of the utility model;

[0028] Figure 4 It is a schematic diagram of an aeration device in one embodiment of the utility model;

[0029] Figure 5 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0030] Figure 6 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0031] Figure 7 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0032] Figure 8 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0033] Fig. 9 The figure is a schematic diagram of the placement of the aerator in one embodiment of the utility model.

[0034] Description of reference numerals:

[0035] 1. Main body; 2. First annular member; 3. Second annular member; 4. Third annular member; 5. Fourth annular member; 6. Fifth annular member; 7. Primary anoxic zone; 8. Secondary anoxic zone; 9. Diversion channel; 10. Aerobic zone; 11. Aerobic degassing channel; 12. Sedimentation zone; 13. Water inlet ejector; 14. Throat; 15. First water return port; 16. Exhaust pipe; 17. First mud slide; 18. Diversion plate; 19. First notch; 20. Second notch; 21. Third notch; 22. Fourth gap; 23. Fifth gap; 24. Sixth gap; 25. Aeration device; 26. Second mud slide; 27. Nitration liquid return pipe; 28. Sludge return pipe; 29. ​​Sludge bucket; 30. Water outlet trough; 31. Water outlet pipe; 32. Sludge discharge pipe; 33. Aerator; 34. Premixing hood; 35. First premixing zone; 36. Second water return port; 37. Fairing; 38. Second premixing zone; 39. Speed-retaining part; 40. Baffle; 41. Tooth-shaped port; 42. Diversion port. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] like Figure 1 As shown, this embodiment provides an assembled aerobic granular sludge reaction device, comprising: a body 1, and an anoxic zone, an aerobic zone 10 and a sedimentation zone 12 arranged in sequence in the body 1 along the water flow path; a water acceleration device, arranged in the anoxic zone, the water acceleration device comprising a water inlet ejector 13 and a throat 14, the inlet of the water inlet ejector 13 is suitable for being connected to an external sewage source, and the water inlet ejector 13 at least partially extends into the throat 14; a gap is left between the bottom of the throat 14 and the bottom of the anoxic zone to form a first water return port 15; the water is accelerated by the water inlet ejector 13 and the throat 14 and released into the anoxic zone to form a negative pressure environment in the throat 14; a part of the water in the anoxic zone flows back into the throat 14 through the first water return port 15; a sludge return pipe 28, one end of which is connected to the sedimentation zone 12 and the other end is connected to the throat 14, so as to use the negative pressure in the throat 14 to transport the sludge in the sedimentation zone 12 to the anoxic zone.

[0041] The assembled aerobic granular sludge reaction device provided in the present embodiment forms a negative pressure environment in the throat pipe 14 of the anoxic zone, and utilizes the dead weight of the sludge in the sedimentation zone 12 and the negative pressure in the throat pipe 14 to transport the sludge in the sedimentation zone 12 to the anoxic zone through the sludge return pipe 28. Compared with the prior art of using a pump body and a pipeline for sludge return, it is more energy-saving and environmentally friendly. In addition, there is no need to consider the maintenance of the pump body, which can reduce the burden of system maintenance.

[0042] Specifically, the assembled aerobic granular sludge reaction device mainly includes a body 1, a first ring member 2, a second ring member 3, a third ring member 4, a fourth ring member 5 and a fifth ring member 6. Among them, the materials of the body 1, the first ring member 2, the second ring member 3, the third ring member 4, the fourth ring member 5 and the fifth ring member 6 can all be selected from carbon steel plates, aluminum alloy plates, enamel plates, stainless steel plates or assembled concrete plates, etc. The entire assembled aerobic granular sludge reaction device adopts modular and standardized production, prefabricated modular assembled structures in the factory, and assembled on site into a sewage treatment plant. Among them, the number of rings can be increased as the amount of treated water increases.

[0043] The main body 1 can be a circular tank-like structure, which can be set on the ground or buried underground, and the hollow area inside the main body 1 is used to treat sewage. For example, the main body can also be a square tank-like structure, or a tank-like structure of other shapes. The first annular member 2 is arranged in the main body 1. For example, the first annular member 2 can be arranged concentrically with the main body 1, and the internal space of the first annular member 2 serves as the primary anoxic zone 7. A water inlet ejector 13 and a throat 14 are arranged in the primary anoxic zone 7. One end of the water inlet ejector 13 is connected to an external sewage source through an inlet pipe, and the other end of the water inlet ejector 13 extends into the throat 14. The throat 14 can be arranged concentrically with the first annular member 2, and a gap is left between the bottom of the throat 14 and the bottom of the main body 1 to form a first water return port 15. A conical plate is arranged on the top of the first annular member 2, and the conical plate seals the top of the first annular member 2, and an exhaust pipe 16 is arranged at the cone tip of the conical plate. When in use, external sewage enters the water inlet ejector 13 through the water inlet pipe. The water inlet ejector 13 is a reducer with a water outlet smaller than the water inlet, which can accelerate the incoming water. The accelerated water is sprayed into the throat pipe 14 and rises along the throat pipe 14. After that, the water diffuses from the water outlet at the top of the throat pipe 14 to the surroundings and enters the primary anoxic zone 7. The gas generated in the primary anoxic zone 7 can be discharged through the exhaust hole. The water flows downward in the primary anoxic zone 7 under the action of gravity, and a part of the water can re-enter the throat pipe 14 through the first water return port 15 to participate in stirring and mixing. For example, the throat pipe 14 can also be a pipe body with a reduced diameter section in the middle, so that the water can be accelerated again after entering the throat pipe 14, which is conducive to improving the mixing effect.

[0044] The body 1 is also provided with a second annular member 3, which is concentrically arranged with the first annular member 2, and the second annular member 3 is located in the outer circle, and the area between the second annular member 3 and the first annular member 2 forms a secondary anoxic zone 8. A plurality of first mud slides 17 are arranged on the inner side wall of the first annular member 2 near the bottom, and each first mud slide 17 is arranged downwardly and tilted toward the direction of the first water return port 15, and a water hole is arranged on the side wall of the first annular member 2 between two upper and lower adjacent first mud slides 17, so that the water in the primary anoxic zone 7 enters the secondary anoxic zone 8 through the water hole. For example, the water hole can be arranged near the upper first mud slide 17 to minimize the sludge from entering the secondary anoxic zone 8 from the water hole. A guide plate 18 is arranged on the outer side wall of the first annular member 2, and the position of the guide plate 18 is adapted to the position of the water hole. The guide plate 18 extends toward the bottom of the body 1, and a first gap 19 is left between the bottom of the guide plate 18 and the bottom of the body 1. When in use, the water entering the secondary anoxic chamber from the water hole changes its flow direction to downward under the guidance of the guide plate 18, and then flows out from the first gap 19 between the guide plate 18 and the main body 1, and then turns upward.

[0045] The body 1 is further provided with a third annular member 4, which is concentrically arranged with the second annular member 3 and is located at the outer ring, and the area between the third annular member 4 and the second annular member 3 forms a diversion channel 9. A second gap 20 is left between the top of the second annular member 3 and the top of the body 1, and the water in the secondary anoxic enters the diversion channel 9 through the second gap 20.

[0046] The body 1 is also provided with a fourth annular member 5, which is concentrically arranged with the third annular member 4 and is located in the outer circle, and the area between the fourth annular member 5 and the third annular member 4 forms an aerobic zone 10. A third gap 21 is left between the bottom of the third annular member 4 and the bottom of the body 1, and the water in the diversion channel 9 enters the aerobic zone 10 through the third gap 21. The aerobic zone 10 is provided with an aeration device 25, which can be located at the bottom of the aerobic zone 10. The lower halves of the third annular member 4 and the fourth annular member 5 can be concave toward the center of the aerobic zone 10, so that the downstream flow channel area of ​​the aerobic zone 10 is smaller than the upstream flow channel area. With such arrangement, the cross-sectional structure of the aerobic zone 10 is small at the bottom and large at the top. Through the air lift effect of the aeration device 25, the rising velocity of the water body at the bottom will be high, and the velocity at the top will be low, so that the raw water entering the aerobic zone 10 is quickly mixed and risen, and then enters the comprehensive treatment in the low-velocity zone in the middle and upper part.

[0047] The body 1 is also provided with a fifth ring member 6, which is concentrically arranged with the fourth ring member 5 and is located in the outer ring. The area between the fifth ring member 6 and the fourth ring member 5 forms an aerobic degassing channel 11, and the area between the fifth ring member 6 and the inner wall of the body 1 forms a sedimentation zone 12. A fourth gap 22 is left between the top of the fourth ring member 5 and the top of the body 1, and the water in the aerobic zone 10 enters the aerobic degassing channel 11 through the fourth gap 22. A fifth gap 23 is left between the bottom of the fifth ring member 6 and the bottom of the body 1, so that the water in the first branch of the aerobic degassing channel 11 enters the sedimentation zone 12 through the fifth gap 23. A sixth gap 24 is left between the bottom of the fourth ring member 5 and the bottom of the body 1, so that the water in the second branch of the aerobic degassing channel 11 flows back to the aerobic zone 10 through the sixth gap 24.

[0048] Among them, since the lower parts of the third annular member 4 and the fourth annular member 5 are both concave toward the center direction of the aerobic zone 10, the flow channel area of ​​the lower region of the aerobic zone 10 is smaller than the flow channel area of ​​the upper region, and at the same time, the downstream flow channel area of ​​the guide channel 9 is larger than the upstream flow channel area of ​​the guide channel 9. In addition, the downstream flow channel area of ​​the aerobic degassing channel 11 is also larger than the upstream flow channel area of ​​the aerobic degassing channel 11. With such a configuration, for the aerobic degassing channel 11, the lower part becomes larger, the flow rate becomes slower, the gas release will be better, and the degassing effect is good.

[0049] like Figure 2 As shown, a plurality of nitrification liquid return pipes 27 are also provided in the main body 1, one end of the nitrification liquid return pipe 27 is connected to the aerobic degassing channel 11, and the other end is connected to the water inlet ejector 13, so that the nitrification liquid in the aerobic degassing channel 11 can flow back to the primary anoxic zone 7. For example, the pipe section of each nitrification liquid return pipe 27 located in the aerobic degassing channel 11 can be an elbow pipe, the pipe mouth of the elbow pipe is set downward, and is located in the lower half of the aerobic degassing channel 11. Among them, the nitrification liquid return pipe 27 has a downward mouth and is located in the area with a larger cross-sectional area at the lower part of the degassing channel, so that the full pipe can flow back at a lower flow rate, and the downward mouth of the pipe can minimize the sludge particles following the nitrification liquid back to the anoxic zone. With such a configuration, the nitrification liquid can be returned to the primary anoxic zone for denitrification to remove the total nitrogen in the sewage.

[0050] like Figure 3 As shown, a plurality of sludge return pipes 28 are also provided in the body 1, one end of the sludge return pipe 28 is connected to the sedimentation zone 12, and the other end is connected to the throat 14, so that the sludge in the sedimentation zone 12 can be returned to the primary anoxic zone 7. For example, the pipe section of each sludge return pipe 28 located in the sedimentation zone 12 can be an elbow pipe, and a sludge hopper 29 is provided at the end of the elbow pipe, and the opening of the sludge hopper 29 is arranged upward. For example, the sludge hopper 29 can be located in the lower half of the sedimentation zone 12. With such an arrangement, the sludge in the sedimentation zone 12 can be returned to the primary anoxic zone 7 without the need to set up external power equipment.

[0051] Among them, a water outlet trough 30 is also provided in the main body 1, and the water outlet trough 30 is located at the top of the sedimentation area 12. After sedimentation and filtration in the sedimentation area 12, the water enters the water outlet trough 30. The water outlet trough 30 is externally connected to a plurality of water outlet pipes 31 to discharge the water in the water outlet trough 30 to the outside of the main body 1.

[0052] Among them, the body 1 is also provided with a second mud slide 26, which is inclined toward the direction of the fifth notch 23 and arranged at the bottom of the sedimentation zone 12 to form a sludge return chute, wherein the fifth notch 23 and the sixth notch 24 are connected, and the sludge in the sludge return chute is diluted by the water body returning in the aerobic degassing channel 11 before flowing into the aerobic zone 10 and then enters the aerobic zone 10. In this way, under the action of the sludge return chute, the sludge in the sedimentation zone 12 can slide to the bottom of the aerobic zone 10, and at the same time, the mixture returning in the aerobic degassing channel 11 can dilute the sludge sliding down in the sedimentation zone 12 (the diluted sludge is more conducive to gas lift). The three are mixed and raised at the same time in the lower part of the aerobic zone 10 under the action of gas lift. At this point, the dilution of the raw water and the sludge return replenishment of the sedimentation tank occur in the same area, which improves the treatment efficiency of the aerobic zone 10 and greatly improves the impact load resistance of the aerobic zone. Moreover, compared with the prior art method of using a pump reflux to replenish the sludge in the sedimentation tank to the aerobic front end, it is more energy-efficient. A sludge discharge pipe 32 is also provided, one end of which passes through the second sludge sliding plate 26 and is connected to the bottom of the sedimentation area 12, and the other end extends to the outside of the body 1 to discharge the waste sludge in the sedimentation area 12.

[0053] The outer ring sedimentation area may or may not include an inclined tube separation device. The water inlet ejectors 13 may be nested with each other to form a multi-stage acceleration form as required.

[0054] like Figure 4As shown, the aeration device 25 includes: an aerator 33, which is arranged in the aerobic zone 10 that needs aeration; wherein, a plurality of aerators 33 can be provided, and the aerators 33 can be arranged in a point shape in the aerobic zone 10, for example, a plurality of aerators 33 arranged in a point shape can be arranged in a ring. The aerators 33 can also be arranged in a strip shape in the aerobic zone 10, for example, a plurality of aerators 33 can 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 can be designed as needed. 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 the second water return port 36, and the second 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 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 10 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 25 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 second 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 second 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 10 outside the first premixing zone 35. With such a configuration, when the aeration device 25 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 5As shown, the aeration device 25 further includes 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 42, and the diversion port 42 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 10 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 42 and is divided into two branches, one of which moves toward the direction of the second water return port 36 to form a cycle, and the other flows over the fairing 37 and flows toward the 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 Fig. 9 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 6As shown, in one embodiment, the aeration device 25 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 7 As shown, the aeration device 25 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 8 As shown, in another embodiment, the aeration device 25 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] When in use: after the raw water enters the water inlet ejector 13, it enters the throat 14, forming an up-and-down cross-flow mixture in the primary anoxic zone 7. The low-pressure drainage effect generated after the water injection returns the nitrified liquid to the primary anoxic zone for denitrification to remove the total nitrogen in the sewage. At the same time, the sludge in the sludge hopper 29 is also led to the primary anoxic zone 7 through the sludge return pipe 28 to supplement the sludge and realize the function of biological selection.

[0062] Before the water in the primary anaerobic zone enters the secondary anaerobic zone, the rising water is deflected by the first mud slide 17, and then the sludge volume in the primary anaerobic zone is maximized through the impact and swirl of the first mud slide 17, thereby reducing loss and improving biomass and treatment efficiency. The angle of the first mud slide 17 allows the sliding medium to re-enter the throat 14 along the hydraulic direction, so that the raw water is instantly diluted and mixed with the existing microorganisms as soon as it enters the system, achieving the purpose of timely treatment.

[0063] After the anoxic reaction is completed, the water in the secondary anoxic zone 8 enters the aerobic zone 10 through the diversion channel 9. The cross-sectional structure of the aerobic zone 10 is small at the bottom and large at the top. Through the air lift effect of the aeration device 25, the rising flow velocity at the bottom will be high and the flow velocity at the top will be low, so that the raw water entering the aerobic zone 10 is quickly mixed and risen, and then enters the low-speed zone in the middle and upper parts for comprehensive treatment.

[0064] At the same time, under the action of the second mud slide 26, the sludge in the sedimentation zone 12 can slide to the bottom of the aerobic zone 10. At the same time, the mixture refluxed in the aerobic degassing channel 11 can dilute the sludge sliding down in the sedimentation zone 12 (the diluted sludge is more conducive to gas lift). The three are mixed and lifted at the same time in the lower part of the aerobic zone 10 under the action of gas lift. At this point, the dilution of raw water and the sludge return replenishment of the sedimentation tank occur in the same area, which improves the treatment efficiency of the aerobic zone 10 and greatly improves the impact load resistance of the aerobic zone.

[0065] The sedimentation zone 12 is in the outermost ring, and adopts the principle of combining mud layer filtration and vertical flow sedimentation, with mud layer filtration in the lower part and vertical flow sedimentation in the upper part. Most of the suspended matter is first intercepted by the middle and lower parts, and then the remaining suspended matter is gradually precipitated through the elevation. A plurality of mud discharge pipes 32 are provided at the bottom of the second mud slide 26, and the remaining sludge can be discharged regularly. A plurality of sludge hoppers 29 are suspended in the middle and lower parts of the sedimentation zone 12 to collect some sludge with good sedimentation properties and low oxygen content to supplement the sludge in the primary anoxic zone 7. Among them, the dissolved oxygen of the sludge decreases as the process progresses, and high dissolved oxygen will result in the failure to achieve the anoxic effect.

[0066] In summary, the assembled aerobic granular sludge reaction device in this application adopts modular and standardized production, prefabricated modular assembled structures in the factory, and assembled into a sewage treatment plant on site. Compared with traditional sewage treatment plants, the construction period is greatly shortened, the construction impact is greatly reduced, and the quality control is stricter.

[0067] In the assembled aerobic granular sludge reaction device of the present application, the nitrification liquid reflux and the sludge reflux are hydraulically refluxed using the Bernoulli principle, and there are no moving parts inside, which is more energy-saving and convenient for maintenance. The sludge reflux in the sedimentation zone 12 adopts gravity reflux, and the air lift principle is used to allow the sludge to quickly enter the aerobic zone 10, which is energy-saving and environmentally friendly.

[0068] The assembled aerobic granular sludge reaction device in the present application has a circular structure as the main body 1, which has strong resistance to fill pressure and uniform force, and has a safe and stable structure and can be placed above ground or underground.

[0069] The assembled aerobic granular sludge reaction device in the present application has precise control over each reflow point to ensure significant nitrogen removal and phosphorus removal effects in the aerobic section, and the unique combination of internal circulation and reflow greatly improves the impact load resistance of the aerobic section.

[0070] 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. An assembled aerobic granular sludge reaction device, characterized in that: include: A body (1), and an anoxic zone, an aerobic zone (10) and a sedimentation zone (12) sequentially arranged in the body (1) along a water flow path; A water acceleration device is arranged in the anoxic zone, the water acceleration device comprises a water inlet ejector (13) and a throat (14), the inlet of the water inlet ejector (13) is suitable for being connected to an external sewage source, and the water inlet ejector (13) at least partially extends into the throat (14); a gap is left between the bottom of the throat (14) and the bottom of the anoxic zone to form a first water return port (15); the water is accelerated by the water inlet ejector (13) and the throat (14) and then released into the anoxic zone, so that a negative pressure environment is formed in the throat (14); a part of the water in the anoxic zone flows back into the throat (14) through the first water return port (15); A sludge return pipe (28) is connected to the sedimentation zone (12) at one end and to the throat pipe (14) at the other end, so as to utilize the negative pressure in the throat pipe (14) to transport the sludge in the sedimentation zone (12) to the anoxic zone.

2. The assembled aerobic granular sludge reaction device according to claim 1, characterized in that: It also includes a sludge hopper (29) connected to one end of the sludge return pipe (28) located in the sedimentation area (12); the opening of the sludge hopper (29) is arranged upward and is located in the lower half of the sedimentation area (12).

3. The assembled aerobic granular sludge reaction device according to claim 1, characterized in that: The invention also comprises an aerobic degassing channel (11) which is arranged in the body (1); the inlet of the aerobic degassing channel (11) is connected to the outlet of the aerobic zone (10); the outlet of the aerobic degassing channel (11) is divided into a first branch and a second branch; a part of the water in the aerobic degassing channel (11) enters the sedimentation zone (12) along the first branch, and another part of the water in the aerobic degassing channel (11) flows back to the aerobic zone (10) along the second branch.

4. The assembled aerobic granular sludge reaction device according to claim 3, characterized in that: A sludge return chute is provided at the bottom of the sedimentation zone (12), and the sludge return chute is connected to the aerobic degassing channel (11) and the aerobic zone (10); The water in the first branch enters the sedimentation area (12) through the sludge return chute; Part of the sludge in the sedimentation zone (12) slides down through the sludge return chute and mixes with the water from the second branch before returning to the aerobic zone (10).

5. The assembled aerobic granular sludge reaction device according to claim 3, characterized in that: It also includes a nitrification liquid return pipe (27), one end of which is connected to the aerobic degassing channel (11), and the other end of which is connected to the water inlet ejector (13), so that the nitrification liquid in the aerobic degassing channel (11) can return to the anoxic zone.

6. The assembled aerobic granular sludge reaction device according to claim 5, characterized in that: The downstream flow channel area of ​​the aerobic degassing channel (11) is larger than the upstream flow channel area; The nitrification liquid reflux pipe (27) is located in the downstream flow channel of the aerobic degassing channel (11), and the pipe mouth of the nitrification liquid reflux pipe (27) is arranged downward.

7. The assembled aerobic granular sludge reaction device according to claim 1, characterized in that: The anoxic zone includes a primary anoxic zone (7) and a secondary anoxic zone (8) connected to each other; The water acceleration device is arranged in the primary anoxic zone (7); The secondary anoxic zone (8) is communicated with the aerobic zone (10).

8. The assembled aerobic granular sludge reaction device according to claim 7, characterized in that: A plurality of first mud slides (17) are arranged at intervals on the inner side wall of the bottom of the primary anoxic zone (7), and each of the first mud slides (17) is inclined toward the first water return port (15) to guide the water body to move toward the first water return port (15); The primary anoxic zone (7) is provided with a water hole on the side wall between two upper and lower adjacent first mud slides (17), and the water hole is provided close to the upper first mud slide (17); A guide plate (18) is arranged on the outer wall of the bottom of the primary anoxic zone (7), the position of the guide plate (18) matches the position of the water hole, and the bottom of the guide plate (18) does not contact the bottom of the secondary anoxic zone (8); the water in the primary anoxic zone (7) enters the secondary anoxic zone (8) through the water hole, and flows toward the bottom of the secondary anoxic zone (8) under the action of the guide plate (18), and then the water turns over the guide plate (18) and flows upward.

9. The assembled aerobic granular sludge reaction device according to claim 7, characterized in that: It also includes a diversion channel (9), one end of which is connected to the secondary anoxic zone (8) and the other end of which is connected to the aerobic zone (10), so that the water in the secondary anoxic zone (8) enters the aerobic zone (10) through the diversion channel (9); The downstream flow channel area of ​​the flow guide channel (9) is larger than the upstream flow channel area.

10. The assembled aerobic granular sludge reaction device according to claim 1, characterized in that: The upstream flow channel area of ​​the aerobic zone (10) is larger than the downstream flow channel area, and the aeration device (25) in the aerobic zone (10) is arranged in the upstream flow channel of the aerobic zone (10).

11. The assembled aerobic granular sludge reaction device according to claim 10, characterized in that: The aeration device (25) comprises: an aerator (33), arranged in the aerobic zone (10); 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 second water return port (36), and the second water return port (36) communicates with the first premixing zone (35) and 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 assembled aerobic granular sludge reaction 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 (42), and the flow splitter (42) communicates with the second premixing zone (38) and a space outside the second premixing zone (38).

13. The assembled aerobic granular sludge reaction 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 assembled aerobic granular sludge reaction 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 assembled aerobic granular sludge reaction 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 assembled aerobic granular sludge reaction 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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