Multiphase multi-set aerobic granular sludge device

Abstract

The utility model relates to the technical field of sewage treatment, and provides a multiphase multi-set aerobic granular sludge device which comprises a body, and at least an anoxic zone, a first-stage aerobic zone and a second-stage aerobic zone which are arranged along a water body flowing path are arranged in the body; the water distribution bin is arranged in the anoxic zone and annularly arranged in the circumferential direction of the first-stage aerobic zone, an inlet of the water distribution bin is suitable for being connected with an external sewage source, an outlet of the water distribution bin is communicated with the anoxic zone, and the water distribution bin conveys water into the anoxic zone in an annular water distribution mode. According to the multi-phase multi-set aerobic granular sludge device provided by the utility model, through the structural layout design of the first-stage aerobic zone and the anoxic zone and the water distribution mode of the water distribution bin, a pump body is not required to be matched with a pipeline to carry out nitrification liquid backflow, and an accelerating device is not required to be arranged to accelerate inlet water; energy conservation and environmental protection are facilitated, and the system maintenance burden is not increased.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a multi-phase multi-set 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 multi-phase multi-set 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 multi-phase multi-set aerobic granular sludge device, comprising: a body, wherein at least an anoxic zone, a primary aerobic zone and a secondary aerobic zone are arranged along a water flow path; a water distribution bin, which is arranged in the anoxic zone and is arranged in a ring shape along the circumference of the primary aerobic zone, wherein the inlet of the water distribution bin is suitable for being connected to an external sewage source, and the outlet of the water distribution bin is connected to the anoxic zone, and the water distribution bin transports water to the anoxic zone by means of an annular water distribution; the outlet of the anoxic zone is divided into a first branch and a second branch, the inlet of the primary aerobic zone is connected to the first branch, and a part of the water in the anoxic zone enters the primary aerobic zone through the first branch; the outlet of the primary aerobic zone is connected to the inlet of the anoxic zone, so that the nitrified liquid in the primary aerobic zone enters the anoxic zone; the inlet of the secondary aerobic zone is connected to the second branch, and another part of the water in the anoxic zone enters the secondary aerobic zone through the second branch.

[0006] Furthermore, a plurality of water outlets are provided at the outlet of the water distribution bin.

[0007] Furthermore, the upstream flow channel area of ​​the primary aerobic zone is smaller than the downstream flow channel area; and the aeration device in the primary aerobic zone is arranged in the upstream flow channel of the primary aerobic zone.

[0008] Furthermore, the upstream flow channel of the primary 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 of the first branch enters the primary aerobic zone through the first gap.

[0009] Furthermore, a first guide plate is provided on the inner wall of the bottom of the anoxic zone, and the first guide plate is inclined toward the first notch to guide the water body to move toward the first notch.

[0010] Furthermore, an opening is provided on the side wall of the anoxic zone near the bottom, a second guide plate is provided on the inner wall of the anoxic zone at a position matching the opening, and a third guide plate is provided on the outer wall of the anoxic zone at a position matching the opening, the second guide plate, the opening and the third guide plate together form a water passage connecting the anoxic zone and the secondary aerobic zone, and the water of the second branch enters the secondary aerobic zone through the water passage; wherein the second guide plate is provided in parallel with the first guide plate; the third guide plate extends toward the bottom of the secondary aerobic zone, and the third guide plate guides the water to flow toward the bottom of the secondary aerobic zone, and then the water turns over the third guide plate and flows upward.

[0011] Furthermore, the upstream flow channel area of ​​the secondary aerobic zone is smaller than the downstream flow channel area; the aeration device in the secondary aerobic zone is arranged in the upstream flow channel of the secondary aerobic zone; and the water passage guides the water body to the upstream flow channel of the secondary aerobic zone.

[0012] Furthermore, the multi-phase multi-set aerobic granular sludge device also includes an aerobic degassing channel and a sedimentation zone; the inlet of the aerobic degassing channel is connected to the outlet of the secondary aerobic zone; the outlet of the aerobic degassing channel is divided into a third branch and a fourth branch, a part of the water in the aerobic degassing channel enters the sedimentation zone through the third branch, and another part of the water in the aerobic degassing channel flows back to the secondary aerobic zone through the fourth branch.

[0013] Furthermore, a sludge return chute is provided at the bottom of the sedimentation zone, and the sludge return chute is connected to the aerobic degassing channel and the secondary aerobic zone; the water from the third 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 fourth branch before returning to the secondary aerobic zone.

[0014] Furthermore, the main body is a round tank-shaped structure, and the primary aerobic zone, the anoxic zone, the secondary aerobic zone, the aerobic degassing channel and the sedimentation zone are concentrically arranged in the main body, and in the direction from the inner circle to the outer circle, they are the primary aerobic zone, the anoxic zone, the secondary aerobic zone, the aerobic degassing channel and the sedimentation zone.

[0015] Furthermore, the aeration device includes: an aerator, which is arranged in the primary aerobic zone and / or the secondary 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 aerated 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 second tooth-shaped openings are arranged at the edge of the fairing opening, and the plurality of second 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 multi-phase multi-set aerobic granular sludge device provided by the utility model is provided with a primary aerobic zone and a secondary aerobic zone, wherein the secondary aerobic zone is located downstream of the anoxic zone to maintain the existing function unchanged, and the primary aerobic zone and the anoxic zone are interconnected. Moreover, the annular water distribution bin is arranged in the anoxic zone to realize the annular water distribution method, and the dead weight of the water body is used to force a part of the water body in the anoxic zone to enter the primary aerobic zone. When the water body circulates between the primary aerobic zone and the anoxic zone, the nitrification liquid in the primary aerobic zone can be driven to enter the anoxic zone, and denitrification is carried out in the anoxic zone to remove the total nitrogen in the sewage. With such arrangement, through the structural layout design of the primary aerobic zone and the anoxic zone, combined with the water distribution method of the water distribution bin, it is possible to avoid the need to use a pump body and a pipeline to reflux the nitrification liquid, and it is also possible to avoid the need to set an acceleration device to accelerate the water inlet, which is beneficial to energy saving and environmental protection and will not increase the burden of system maintenance. 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 multi-phase multi-set aerobic granular sludge device in an 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. Anoxic zone; 3. Primary aerobic zone; 4. Secondary aerobic zone; 5. Aerobic degassing channel; 6. Sedimentation zone; 7. First annular member; 8. Second annular member; 9. Third annular member; 10. Fourth annular member; 11. Water distribution bin; 12. Water inlet plate; 13. Water outlet; 14. First gap; 15. Second gap; 16. Third gap; 17. Fourth gap; 18. Fifth gap; 19. Sludge return chute; 20. The first guide plate; 21. The second guide plate; 22. The third guide plate; 23. The water passage; 24. The aeration device; 25. The premixing section; 26. The speed-maintaining section; 27. The water outlet trough; 28. The water outlet pipe; 29. ​​The water inlet pipe; 30. The aerator; 31. The premixing hood; 32. The first premixing zone; 33. The water return port; 34. The fairing; 35. The second premixing zone; 36. The speed-maintaining member; 37. The baffle; 38. The second tooth-shaped opening; 39. The diversion 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 multi-phase multi-set aerobic granular sludge device, including: a body 1, wherein the interior of the body 1 is provided with at least an anoxic zone 2, a primary aerobic zone 3 and a secondary aerobic zone 4 arranged along the flow path of the water body; a water distribution tank 11, which is arranged in the anoxic zone 2 and is arranged in a ring shape along the circumference of the primary aerobic zone 3, wherein the inlet of the water distribution tank 11 can be connected to an external sewage source through a water inlet pipe 29, and the outlet of the water distribution tank 11 is connected to the anoxic zone 2, and the water distribution tank 11 is connected to the anoxic zone 2 through a ring-shaped water distribution. The water body is transported to the anoxic zone 2 in this way; the outlet of the anoxic zone 2 is divided into a first branch and a second branch, the entrance of the primary aerobic zone 3 is connected with the first branch, and a part of the water body of the anoxic zone 2 enters the primary aerobic zone 3 through the first branch; the outlet of the primary aerobic zone 3 is connected with the entrance of the anoxic zone 2, so that the nitrification liquid in the primary aerobic zone 3 enters the anoxic zone 2; the entrance of the secondary aerobic zone 4 is connected with the second branch, and another part of the water body of the anoxic zone 2 enters the secondary aerobic zone 4 through the second branch.

[0038] The multi-phase multi-set aerobic granular sludge device provided in this embodiment is provided with a primary aerobic zone 3 and a secondary aerobic zone 4, wherein the secondary aerobic zone 4 is located downstream of the anoxic zone 2 to maintain the existing function unchanged, and the primary aerobic zone 3 and the anoxic zone 2 are interconnected. Moreover, the annular water distribution tank 11 is arranged in the anoxic zone 2 to realize the annular water distribution mode, and the dead weight of the water body and the gas lift effect of the primary aerobic zone 3 are used to force a part of the water body in the anoxic zone 2 to enter the primary aerobic zone 3. When the water body circulates between the primary aerobic zone 3 and the anoxic zone 2, the nitrification liquid in the primary aerobic zone 3 can be driven to enter the anoxic zone 2, and denitrification is carried out in the anoxic zone 2 to remove the total nitrogen in the sewage. In this way, through the structural layout design of the primary aerobic zone 3 and the anoxic zone 2, combined with the water distribution mode of the water distribution tank 11, it is not necessary to use a pump body and a pipeline to reflux the nitrification liquid, and it is not necessary to set an acceleration device to accelerate the drainage of the incoming water, which is beneficial to energy saving and environmental protection and will not increase the burden of system maintenance.

[0039] Specifically, the multi-phase multi-set aerobic granular sludge device includes: a body 1, which can be a circular tank structure, a square tank structure, or a tank structure of various other shapes. For example, the body 1 is a circular tank structure, which can be set on the ground or buried underground, and the hollow area inside the body 1 is used to treat sewage. The interior of the body 1 is provided with a first ring member 7, a second ring member 8, a third ring member 9 and a fourth ring member 10 arranged concentrically, wherein from the inside to the outside are the first ring member 7, the second ring member 8, the third ring member 9 and the fourth ring member 10. Among them, the materials of the first ring member 7, the second ring member 8, the third ring member 9 and the fourth ring member 10 can be selected from carbon steel plates, aluminum alloy plates, enamel plates, stainless steel plates or assembled concrete plates, etc. The entire multi-phase multi-set aerobic granular sludge device is modularized and standardized, and the modular assembled structure is prefabricated in the factory, and the sewage treatment plant is assembled 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. The number of annular members can be increased as the amount of water to be processed increases.

[0040] The first annular member 7 is arranged in the body 1, and the inner ring space of the first annular member 7 forms a primary aerobic zone 3. For the first annular member 7, the lower half of the first annular member 7 can be recessed toward the center of the primary aerobic zone 3, so that the upstream flow channel area of ​​the primary aerobic zone 3 is smaller than the downstream flow channel area. Further, the upstream flow channel of the primary aerobic zone 3 includes a connected premixing section 25 and a speed-maintaining section 26, and the speed-maintaining section 26 is located downstream of the premixing section 25; the flow channel area of ​​the premixing section 25 gradually decreases in the direction close to the speed-maintaining section 26, for example, the premixing section 25 can be designed as a conical structure, and the aeration device 24 is arranged in the premixing section 25; a first gap 14 is left between the end of the premixing section 25 away from the speed-maintaining section 26 and the bottom of the body 1, so that the water of the first branch enters the primary aerobic zone 3 through the first gap 14.

[0041] The downstream flow channel of the primary aerobic zone 3 is provided with a plurality of aeration devices 24. Under the effect of air lift, the water body upstream of the primary aerobic zone 3 has a high rising velocity and a low downstream velocity, so that the raw water entering the primary aerobic zone 3 is quickly mixed and raised, and then fully treated in the low-speed zone in the middle and upper part. The water distribution bin 11 can be arranged in the inwardly concave area of ​​the first annular member 7, thereby improving the space utilization efficiency in the body 1.

[0042] A first guide plate 20 is disposed on the inner wall of the bottom of the anoxic zone 2 , and the first guide plate 20 is inclined toward the first notch 14 to guide the water body to move toward the first notch 14 .

[0043] The second annular member 8 is disposed in the body 1, and the space between the second annular member 8 and the first annular member 7 forms an annular anoxic zone 2, and the outlet of the anoxic zone 2 is connected to the inlet of the primary aerobic zone 3 through the first notch 14. A second notch 15 is left between the top of the first annular member 7 and the top of the body 1, and the inlet of the anoxic zone 2 is connected to the outlet of the primary aerobic zone 3 through the second notch 15.

[0044] Among them, an annular water inlet plate 12 is arranged on the outer side wall of the first annular member 7, and the space between the annular water inlet plate 12 and the first annular member 7 forms an annular water distribution bin 11, and the bottom of the annular water inlet plate 12 is provided with a plurality of water outlets 13 at the edge in contact with the first annular member 7, so that the water in the annular water distribution bin 11 can enter the anoxic zone 2 through the water outlets 13. The entrance of the annular water distribution bin 11 can be connected to the external sewage source through the water inlet pipe 29. When in use, the external sewage first enters the annular water distribution bin 11 through the water inlet pipe 29, and then the water in the water distribution bin 11 enters the anoxic zone 2 through the water outlet 13, and then a part of the water in the anoxic zone 2 enters the primary aerobic zone 3 through the first gap 14, and the water flows through the primary aerobic zone 3 and then re-enters the anoxic zone 2 through the second gap 15, and the water circulates to improve the stirring and mixing effect, and the nitrification liquid in the primary aerobic zone 3 is sent to the anoxic zone 2.

[0045] The water outlet 13 may be a water outlet channel in various forms. For example, the water outlet 13 may be a toothed opening, a circular hole, a semicircular hole, a square hole arranged at intervals, or a gap of a full channel.

[0046] Among them, the annular water distribution tank 11 can make the water body evenly distributed, and the water body can flow out through the water outlet 13 by using the dead weight of the water body, and the water body can have a certain initial velocity without using an additional water body acceleration device, so that the raw water and the nitrification liquid can be quickly mixed in the anoxic zone 2, and the denitrification reaction starts faster. Moreover, after the water body passes through the water outlet 13, there are small channels between the water outlets 13. The high flow rate caused by the small channels and the relatively low flow rate of the surrounding water body will produce a pressure difference, which can improve the mixing effect and make the water distribution more uniform.

[0047] The third annular member 9 is arranged in the body 1, and the space between the third annular member 9 and the second annular member 8 forms a secondary aerobic zone 4. The second annular member 8 is provided with an opening on the side wall near the bottom of the body 1, and a second guide plate 21 is provided on the side wall of the second annular member 8 facing the first annular member 7, and a third guide plate 22 is provided on the side wall of the second annular member 8 facing the third annular member 9. The second guide plate 21, the opening, the third guide plate 22 and the second annular member 8 together form a water passage 23, which connects the anoxic zone 2 with the secondary aerobic zone 4. When in use, after the water entering the anoxic zone 2 from the primary aerobic zone 3 is mixed with the raw water from the water distribution bin 11, a part of the water enters the primary aerobic zone 3 from the first notch 14, and the other part of the water enters the secondary aerobic zone 4 from the water passage 23. Moreover, under the action of the water passage 23, the water is guided to flow to the bottom of the secondary aerobic zone 4, and then the water turns over the third guide plate 22 and flows upward. With such arrangement, the water passage 23 is designed to, on the one hand, pass water at a high position to retain the sludge microorganisms in the anoxic zone 2; on the other hand, the left side extends to the lower channel of the aeration device 24 for air lift drainage, and because the water passage 23 is annular, the drainage effect can make the water pass more evenly in a circle, rather than local water inflow.

[0048] Among them, for the third annular member 9, the lower half of the third annular member 9 is recessed toward the center of the secondary aerobic zone 4, so that the upstream flow channel area of ​​the secondary aerobic zone 4 is smaller than the downstream flow channel area.

[0049] The downstream flow channel structure design of the secondary aerobic zone 4 can be the same as the downstream flow channel design of the primary aerobic zone 3. The aeration device 24 in the secondary aerobic zone 4 is also arranged in the premixing section 25. Under the action of air lift, the water body upstream of the secondary aerobic zone 4 has a high rising velocity and a low downstream velocity, so that the water body entering the secondary aerobic zone 4 is quickly mixed and risen, and then fully treated in the low-velocity zone in the middle and upper part.

[0050] Among them, for the primary aerobic zone 3 and the secondary aerobic zone 4, the design of the premixing section 25 and the speed-maintaining section 26 can not only accelerate the incoming water, but also improve the drainage force and increase the flow rate of the surrounding water into the primary aerobic zone 3 and the secondary aerobic zone 4.

[0051] The fourth ring member 10 is arranged in the body 1, and the area between the fourth ring member 10 and the third ring member 9 forms an aerobic degassing channel 5, and the area between the fourth ring member 10 and the inner wall of the body 1 forms a sedimentation zone 6. A third gap 16 is left between the top of the third ring member 9 and the top of the body 1, and the water in the secondary aerobic zone 4 enters the aerobic degassing channel 5 through the third gap 16. A fourth gap 17 is left between the bottom of the fourth ring member 10 and the bottom of the body 1, so that the water in the first branch of the aerobic degassing channel 5 enters the sedimentation zone 6 through the fourth gap 17. A fifth gap 18 is left between the bottom of the third ring member 9 and the bottom of the body 1, so that the water in the second branch of the aerobic degassing channel 5 flows back to the secondary aerobic zone 4 through the fifth gap 18.

[0052] Among them, the body 1 is also provided with a mud slide, which is inclined toward the direction of the third notch 16 and arranged at the bottom of the sedimentation zone 6 to form a sludge return chute 19, wherein the fourth notch 17 and the fifth notch 18 are connected, and the sludge in the sludge return chute 19 is diluted by the water body returning in the aerobic degassing channel 5 before flowing into the secondary aerobic zone 4 before entering the secondary aerobic zone 4. In this way, under the action of the sludge return chute 19, the sludge in the sedimentation zone 6 can slide to the bottom of the aerobic zone, and at the same time, the mixture returning in the aerobic degassing channel 5 can dilute the sludge sliding down in the sedimentation zone 6 (the diluted sludge is more conducive to gas lift). The three are mixed and raised at the lower part of the secondary aerobic zone 4 at the same time under the action of gas lift. At this point, the dilution of the raw water and the sludge return supplement of the sedimentation zone 6 occur in the same area, which improves the treatment efficiency of the secondary aerobic zone 4 and greatly improves the impact load resistance of the aerobic zone.

[0053] Among them, since the lower half of the third annular member 9 is concave toward the center direction of the secondary aerobic zone 4, the flow channel area of ​​the lower region of the secondary 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 degassing channel 5 is larger than the upstream flow channel area of ​​the aerobic degassing channel 5. In this way, the flow area of ​​the downstream flow channel of the aerobic degassing channel 5 is large, the flow velocity is low, and the gas is released more than when the flow velocity is fast.

[0054] Among them, a water outlet trough 27 is also provided in the main body 1, and the water outlet trough 27 is located at the top of the sedimentation area 6. After sedimentation and filtration in the sedimentation area 6, the water enters the water outlet trough 27. The water outlet trough 27 is externally connected to a plurality of water outlet pipes 28 to discharge the water in the water outlet trough 27 to the outside of the main body 1.

[0055] The sedimentation zone 6 may or may not be provided with an oblique tube separation device.

[0056] like Figure 2As shown, the aeration device 24 includes: an aerator 30, which is arranged in the primary aerobic zone 3 and / or the secondary aerobic zone 4; wherein, a plurality of aerators 30 may be provided, and the aerators 30 may be arranged in a point-like manner in the primary aerobic zone 3 and / or the secondary aerobic zone 4, for example, a plurality of aerators 30 arranged in a point-like manner may be arranged in a ring. The aerators 30 may also be arranged in a strip-like manner in the primary aerobic zone 3 and / or the secondary aerobic zone 4, for example, a plurality of aerators 30 may be arranged in an array in rows or columns. The arrangement of the aerators 30 is not limited to the above two methods, and the actual arrangement of the aerators 30 may be designed as required. The premixing hood 31 is arranged at the outlet end of the aerator 30, and the space between the premixing hood 31 and the aerator 30 forms the first premixing zone 32; a gap is left between the premixing hood 31 and the aerator 30 to form a water return port 33, and the water return port 33 connects the first premixing zone 32 with the space outside the first premixing zone 32; wherein, the flow area of ​​the release port of the premixing hood 31 is smaller than the flow area of ​​the water inlet of the premixing hood 31, so as to increase the pressure in the first premixing zone 32 under the aerated state. For example, the premixing hood 31 can be a truncated cone structure, with both upper and lower 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 31 can also be a prism-shaped structure, with both upper and lower 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 31 can be welded to the side wall of the primary aerobic zone 3 or the secondary aerobic zone 4 by setting a connecting rod on the side wall; it can also be installed as an integrated structure with the air pipe bracket of the aerator 30 and fixed on the air pipe bracket of the aerator 30.

[0057] The aeration device 24 provided in this embodiment has an aerator 30 that releases air in the first premixing zone 32. As the bubbles rise rapidly, the water outside the first premixing zone 32 is driven to enter the first premixing zone 32 through the water return port 33. In addition, the release port just above the premixing cover 31 is reduced in diameter, so that the pressure in the first premixing zone 32 increases, so that the bubbles are further mixed with the water flowing back through the water return port 33. Due to the increase in pressure, the mixing effect is better, and the mixed gas-water mixture is ejected through the release port and rises to the primary aerobic zone 3 or the secondary aerobic zone 4 outside the first premixing zone 32. With such a configuration, when the aeration device 24 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.

[0058] like Figure 3As shown, the aeration device 24 further includes a fairing 34, which is arranged at the release port of the premixing hood 31, and the end of the fairing 34 away from the premixing hood 31 is a sealing structure, and the inner diameter of the fairing 34 gradually decreases in the direction away from the premixing hood 31; the space between the fairing 34 and the premixing hood 31 forms a second premixing zone 35; a gap is left between the fairing 34 and the premixing hood 31 to form a diversion port 39, and the diversion port 39 connects the second premixing zone 35 with the space outside the second premixing zone 35. The fairing 34 can be welded to the side wall of the primary aerobic zone 3 and / or the secondary aerobic zone 4 by arranging a connecting rod on the side wall. For example, the fairing 34 can be a conical structure with the top of the cone on the top. For another example, the premixing hood 31 can also be a prismatic structure with a smaller top surface on the top. Among them, the shape of the fairing 34 is adapted to the shape of the premixing cover 31. For example, when the premixing cover 31 is a truncated cone structure, the fairing 34 can be a conical structure. For example, when the premixing cover 31 is a prism structure, the fairing 34 can be a prismatic structure. When in use, the gas-water mixture in the first premixing zone 32 enters the second premixing zone 35 through the release port of the premixing cover 31, and the gas-water mixture in the second premixing zone 35 flows out through the diversion port 39 and is divided into two tributaries, one of which has a gas-water mixture moving toward the direction of the return port 33, thereby forming a cycle, and the other has a gas-water mixture crossing the fairing 34 and flowing toward the downstream. Moreover, since the side wall of the fairing 34 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.

[0059] like Figure 7 As shown, a plurality of second tooth-shaped openings 38 can be provided at the edge of the fairing 34, and the plurality of second tooth-shaped openings 38 are distributed along the circumference of the fairing 34. Such a setting has two advantages: first, the mixing effect can be increased through the second tooth-shaped openings 38, because the flow velocities of the concave area and the convex area through the second tooth-shaped openings 38 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.

[0060] like Figure 4As shown, in one embodiment, the aeration device 24 further includes a speed-keeping component 36, which is disposed between the premixing hood 31 and the fairing 34, and the end of the speed-keeping component 36 away from the fairing 34 is connected to the release port of the premixing hood 31. For example, when the premixing hood 31 is a truncated cone structure, the speed-keeping component 36 may be a round tube. When the premixing hood 31 is a prism-shaped structure, the speed-keeping component 36 may be a square tube, so as to match the shape of the premixing hood 31. When in use, the gas-water mixture flowing out of the release port of the premixing hood 31 can enter the speed-keeping component 36, and the speed of the gas-water mixture in the speed-keeping component 36 changes little, and a high flow rate can be maintained, and then it is released from the top outlet of the speed-keeping component 36 to the second premixing zone 35. In this arrangement, a section of the speed-keeping component 36 is added to the release port of the premixing hood 31, and this straight speed-keeping component 36 can keep the drainage force of the first premixing zone 32 relatively large. Because the speed-retaining member 36 increases the height of the release port of the premixing hood 31, the velocity of the gas-water mixture outside the premixing hood 31 is relatively low, and the velocity difference with the gas-water mixture in the first premixing zone 32 is relatively large, so the pressure difference is large. Compared with the case without the speed-retaining member 36, the velocity difference between the two is greater, so the drainage effect is better.

[0061] like Figure 5 As shown, the aeration device 24 further includes a baffle 37, which is arranged inside the fairing 34, and the plate surface of the baffle 37 is arranged opposite to the outlet of the speed-retaining member 36. When in use, the gas-water mixture released from the outlet at the top of the speed-retaining member 36 hits the baffle 37 and then diffuses to the surroundings. Such a setting can prevent the accumulation of air bubbles on the top of the fairing 34, so that the gas is smoothly released into the water, thereby improving the gas-water mixing effect.

[0062] like Figure 6 As shown, in another embodiment, the aeration device 24 further includes a speed-retaining member 36 ; one end of the speed-retaining member 36 is connected to the release port of the premixing hood 31 , and the other end extends in a direction away from the premixing hood 31 .

[0063] When in use: after the raw water enters the water distribution bin 11, it flows out from the outlet at the bottom of the water distribution bin 11, and after mixing with the water in the anoxic zone 2, the water is divided into a first branch and a second branch. The water in the first branch enters the primary aerobic zone 3 through the first gap 14, and the water flows upward under the action of air lift and push flow, and finally returns to the anoxic zone 2 from the second gap 15. During this period, the nitrification liquid in the primary aerobic zone 3 is continuously sent into the anoxic zone. The water in the second branch enters the secondary aerobic zone 4 through the water channel 23, and after the reaction is completed, the water enters the aerobic degassing channel 5 through the third gap 16. The water in the aerobic degassing channel 5 is divided into a third branch and a fourth branch at the outlet, wherein the water in the third branch enters the sedimentation zone 6 through the fourth gap 17 and the sludge return chute 19, and the water in the fourth branch is mixed with the sludge sliding down from the sludge return chute 19 and then flows back to the secondary aerobic zone 4. The sedimentation area 6 is in the outermost ring, and adopts the principle of combining mud layer filtration and vertical flow sedimentation. The mud layer at the bottom of the sedimentation area 6 can filter the water flowing through, and the water is vertically precipitated at the top of the sedimentation area 6. Most of the suspended matter is first intercepted by the middle and lower parts, and then the remaining suspended matter is gradually precipitated by the elevation. The water treated by the sedimentation area 6 enters the water outlet trough 27, and finally flows out to the outside of the body 1 through the water outlet pipe 28.

[0064] 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 multi-phase multi-set aerobic granular sludge device, characterized in that: include: A body (1), wherein the body (1) is provided with at least an anoxic zone (2), a primary aerobic zone (3) and a secondary aerobic zone (4) arranged along a water flow path; a water distribution bin (11) disposed in the anoxic zone (2) and arranged in an annular manner along the circumference of the primary aerobic zone (3); an inlet of the water distribution bin (11) is suitable for being connected to an external sewage source, and an outlet of the water distribution bin (11) is connected to the anoxic zone (2); the water distribution bin (11) transports water to the anoxic zone (2) in an annular water distribution manner; The outlet of the anoxic zone (2) is divided into a first branch and a second branch, the inlet of the primary aerobic zone (3) is connected to the first branch, and a part of the water in the anoxic zone (2) enters the primary aerobic zone (3) through the first branch; the outlet of the primary aerobic zone (3) is connected to the inlet of the anoxic zone (2), so that the nitrification liquid in the primary aerobic zone (3) enters the anoxic zone (2); The entrance of the secondary aerobic zone (4) is connected to the second branch, and another part of the water in the anoxic zone (2) enters the secondary aerobic zone (4) through the second branch.

2. The multi-phase multi-set aerobic granular sludge device according to claim 1 is characterized in that: The upstream flow channel area of ​​the primary aerobic zone (3) is smaller than the downstream flow channel area; The aeration device (24) in the primary aerobic zone (3) is arranged in the upstream flow channel of the primary aerobic zone (3).

3. The multi-phase multi-set aerobic granular sludge device according to claim 2, characterized in that: The upstream flow channel of the primary aerobic zone (3) comprises a premixing section (25) and a speed-maintaining section (26) connected to each other, and the speed-maintaining section (26) is located downstream of the premixing section (25); The flow channel area of ​​the premixing section (25) gradually decreases in a direction approaching the speed-maintaining section (26), and the aeration device (24) is arranged in the premixing section (25); A first gap (14) is left between the end of the premixing section (25) away from the speed-maintaining section (26) and the bottom of the body (1), so that the water in the first branch can enter the primary aerobic zone (3) through the first gap (14).

4. The multi-phase multi-set aerobic granular sludge device according to claim 3, characterized in that: A first guide plate (20) is provided on the inner side wall of the bottom of the anoxic zone (2), and the first guide plate (20) is inclined toward the first notch (14) to guide the water body to move toward the first notch (14).

5. The multi-phase multi-set aerobic granular sludge device according to claim 4, characterized in that: An opening is provided on the side wall of the anoxic zone (2) near the bottom, a second guide plate (21) is provided on the inner side wall of the anoxic zone (2) at a position matching the opening, and a third guide plate (22) is provided on the outer side wall of the anoxic zone (2) at a position matching the opening, the second guide plate (21), the opening and the third guide plate (22) together form a water passage (23) connecting the anoxic zone (2) and the secondary aerobic zone (4), and the water of the second branch enters the secondary aerobic zone (4) through the water passage (23); Wherein, the second guide plate (21) is arranged parallel to the first guide plate (20); The third guide plate (22) extends toward the bottom of the secondary aerobic zone (4), and the third guide plate (22) guides the water body to flow toward the bottom of the secondary aerobic zone (4), and then the water body turns over and flows upward over the third guide plate (22).

6. The multi-phase multi-set aerobic granular sludge device according to claim 5, characterized in that: The upstream flow channel area of ​​the secondary aerobic zone (4) is smaller than the downstream flow channel area; The aeration device (24) in the secondary aerobic zone (4) is arranged in the upstream flow channel of the secondary aerobic zone (4); The water passage (23) guides the water body to the upstream flow channel of the secondary aerobic zone (4).

7. The multi-phase multi-set aerobic granular sludge device according to claim 1, characterized in that: It also includes an aerobic degassing channel (5) and a precipitation zone (6); The inlet of the aerobic degassing channel (5) is connected to the outlet of the secondary aerobic zone (4); The outlet of the aerobic degassing channel (5) is divided into a third branch and a fourth branch. A portion of the water in the aerobic degassing channel (5) enters the sedimentation zone (6) through the third branch, and another portion of the water in the aerobic degassing channel (5) flows back to the secondary aerobic zone (4) through the fourth branch.

8. The multi-phase multi-set aerobic granular sludge device according to claim 7, characterized in that: A sludge return chute (19) is provided at the bottom of the sedimentation zone (6), and the sludge return chute (19) is connected to the aerobic degassing channel (5) and the secondary aerobic zone (4); The water in the third branch enters the sedimentation area (6) through the sludge return chute (19); Part of the sludge in the sedimentation zone (6) slides down through the sludge return chute (19) and mixes with the water from the fourth branch before returning to the secondary aerobic zone (4).

9. The multi-phase multi-set aerobic granular sludge device according to claim 7, characterized in that: The main body (1) is a round can-shaped structure. The primary aerobic zone (3), the anoxic zone (2), the secondary aerobic zone (4), the aerobic degassing channel (5) and the sedimentation zone (6) are concentrically arranged in the main body (1), and are arranged in order from the inner circle to the outer circle, namely, the primary aerobic zone (3), the anoxic zone (2), the secondary aerobic zone (4), the aerobic degassing channel (5) and the sedimentation zone (6).

10. The multi-phase multi-set aerobic granular sludge device according to claim 6, characterized in that: The aeration device (24) comprises: an aerator (30), arranged in the primary aerobic zone (3) and / or the secondary aerobic zone (4); A premixing hood (31) is arranged at the air outlet end of the aerator (30), and the space between the premixing hood (31) and the aerator (30) forms a first premixing zone (32); a gap is left between the premixing hood (31) and the aerator (30) to form a water return port (33), and the water return port (33) communicates with the first premixing zone (32) and the space outside the first premixing zone (32); wherein the flow area of ​​the release port of the premixing hood (31) is smaller than the flow area of ​​the water inlet of the premixing hood (31), so as to increase the pressure in the first premixing zone (32) under the aeration state.

11. The multi-phase multi-set aerobic granular sludge device according to claim 10, characterized in that: It also includes a fairing (34) which is arranged at the release port of the premixing cover (31), the end of the fairing (34) away from the premixing cover (31) is a sealing structure, and the inner diameter of the fairing (34) gradually decreases in a direction away from the premixing cover (31); The space between the fairing (34) and the premixing cover (31) forms a second premixing zone (35); A gap is left between the fairing (34) and the premixing cover (31) to form a flow splitter (39), and the flow splitter (39) communicates with the second premixing zone (35) and a space outside the second premixing zone (35).

12. The multi-phase multi-set aerobic granular sludge device according to claim 11, characterized in that: A plurality of second tooth-shaped openings (38) are arranged at the edge of the fairing opening of the fairing (34), and the plurality of second tooth-shaped openings (38) are distributed along the circumference of the fairing (34).

13. The multi-phase multi-set aerobic granular sludge device according to claim 11, characterized in that: It also includes a speed-retaining component (36) disposed between the premixing cover (31) and the fairing (34), and one end of the speed-retaining component (36) away from the fairing (34) is connected to a release port of the premixing cover (31).

14. The multi-phase multi-set aerobic granular sludge device according to claim 13, characterized in that: It also includes a baffle (37) which is arranged inside the fairing (34), and the plate surface of the baffle (37) is arranged facing the outlet of the speed-retaining component (36).

15. The multi-phase multi-set aerobic granular sludge device according to claim 10, characterized in that: Also includes a speed-retaining member (36); One end of the speed-retaining member (36) is connected to the release port of the premixing cover (31), and the other end extends in a direction away from the premixing cover (31).

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