Multi-stage self-sustaining aerobic granular sludge device

Abstract

The utility model relates to the technical field of sewage treatment, and provides a multi-stage self-sustaining aerobic granular sludge device which comprises a body, and an anoxic zone, a first-stage 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; 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, so that the sludge in the settling zone is conveyed into the anoxic zone by utilizing negative pressure in the throat pipe; wherein external sewage enters the anoxic zone and then flows to the first-stage aerobic zone, and the first-stage aerobic zone conveys nitrification liquid in the first-stage aerobic zone to the anoxic zone through the first branch under the action of the aeration device by utilizing the gas stripping action generated by gas rising. Compared with the prior art in which a pump body is matched with a pipeline to carry out sludge or nitrification liquid backflow, the multistage self-sustaining aerobic granular sludge device provided by the utility model is more energy-saving and environment-friendly, the 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 a multi-stage self-sustaining aerobic granular sludge device. Background Art

[0002] The existing aerobic reaction device mainly includes an anoxic zone, an aerobic zone and a sedimentation zone which are arranged in sequence along the flow path of the sewage. After the raw water of the sewage enters the anoxic zone, it is diluted and mixed with the microorganisms inside it to perform 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. At the same time, 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 sludge or 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 pipelines to reflux sludge or 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-stage self-sustaining aerobic granular sludge device is provided.

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

[0005] The utility model provides a multi-stage self-sustaining aerobic granular sludge device, comprising: a body, and an anoxic zone, a primary aerobic zone and a sedimentation zone 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 to an external sewage source, the water inlet ejector at least partially extending into the throat; the water body 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 sludge return pipe, one end of which is connected to the sedimentation zone, and the other end of which is connected to the throat, so as to utilize the negative pressure in the throat to transport the sludge in the sedimentation zone to the anoxic zone; the primary aerobic zone and the sedimentation zone are connected 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 to an external sewage source, the water inlet ejector at least partially extending into the throat; the water body 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 sludge return pipe, one end of which is connected to the sedimentation zone, and the other end of which is connected to the throat, so as to utilize the negative pressure in the throat to transport the sludge in the sedimentation zone to the anoxic zone; The upstream flow channel area of ​​the aerobic zone is smaller than the downstream flow channel area, and an aeration device is arranged in the upstream flow channel of the primary aerobic zone; the inlet of the primary aerobic zone is connected with the outlet of the anoxic zone, and the outlet of the primary aerobic zone is divided into a first branch and a second branch, the first branch is connected with the anoxic zone, and the second branch is connected with the sedimentation zone; wherein, external sewage flows into the anoxic zone and then flows to the primary aerobic zone, and the primary aerobic zone, under the action of the aeration device, utilizes the gas lift effect generated by the rising gas to transport the nitrified liquid in the primary aerobic zone to the anoxic zone through the first branch; a sludge discharge pipe, one end of which is connected with the bottom of the sedimentation zone, and the other end extends to the outside of the body, so as to discharge the residual sludge in the sedimentation zone.

[0006] Furthermore, the multi-stage self-sustaining aerobic granular sludge 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. 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 close to the speed-maintaining section, and the aeration device is arranged in the premixing section; a gap is left between the end of the premixing section away from the speed-maintaining section and the bottom of the body, so that the water in the anoxic zone can enter the primary aerobic zone.

[0007] Furthermore, a diversion channel is provided in the body, the inlet of the diversion channel is connected to the first branch at the outlet of the primary aerobic zone, and the outlet of the diversion channel is connected to the anoxic zone, so that the nitrification liquid in the primary aerobic zone enters the anoxic zone through the diversion channel.

[0008] Furthermore, a gap is left between the bottom of the throat and the bottom of the body to form a first water return port, and the water in the anoxic zone is divided into a third branch and a fourth branch after passing through the first water return port; the third branch is connected to the throat so that a part of the water in the anoxic zone flows back into the throat through the third branch; the fourth branch is connected to the primary aerobic zone so that another part of the water in the anoxic zone flows into the primary aerobic zone through the fourth branch.

[0009] Furthermore, a water passage is provided in the body, the inlet of the water passage is connected to the fourth branch, and the outlet of the water passage is connected to the primary aerobic zone, so that a part of the water in the anoxic zone enters the primary aerobic zone through the water passage.

[0010] Furthermore, an aerobic degassing channel is also provided in the body, the inlet of the aerobic degassing channel is connected to the second branch at the outlet of the primary aerobic zone, the outlet of the aerobic degassing channel is divided into a fifth branch and a sixth branch, a part of the water in the aerobic degassing channel enters the sedimentation area along the fifth branch, and another part of the water in the aerobic degassing channel flows back to the primary aerobic zone along the sixth branch.

[0011] 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 primary aerobic zone; the water from the fifth 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 sixth branch before returning to the primary aerobic zone.

[0012] Furthermore, a secondary aerobic zone is provided in the body, the inlet of the secondary aerobic zone is connected to the fifth branch, the first outlet of the secondary aerobic zone is connected to the precipitation zone, and the second outlet of the secondary aerobic zone is connected to the aerobic degassing channel.

[0013] Furthermore, a sludge return chute is provided at the bottom of the sedimentation zone, and the sludge return chute is connected to the secondary aerobic zone; water from the first outlet of the secondary aerobic zone 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 flows back to the secondary aerobic zone through the first outlet of the secondary aerobic zone.

[0014] Further, 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 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 aeration state.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] The technical solution of the utility model has the following advantages:

[0021] The multi-stage self-sustaining aerobic granular sludge device provided by the utility model forms a negative pressure environment in the throat of the anoxic zone, and utilizes the deadweight 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 pipelines 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. At the same time, under the action of the aeration device, the primary aerobic zone uses the gas lift effect generated by the rising gas to transport the nitrified liquid in the primary aerobic zone to the anoxic zone through the first branch. With this arrangement, there is no need to use a pump body and pipelines to return the nitrified liquid, which is beneficial to energy saving and environmental protection and will not increase the burden of system maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 It is a schematic diagram of a multi-stage self-sustaining aerobic granular sludge device in one embodiment of the utility model;

[0024] Figure 2 It is a schematic diagram of a multi-stage self-sustaining aerobic granular sludge device in another embodiment of the utility model;

[0025] Figure 3 It is a schematic diagram of an aeration device in one embodiment of the utility model;

[0026] Figure 4 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0027] Figure 5 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0028] Figure 6 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0029] Figure 7 is a schematic diagram of an aeration device in another embodiment of the utility model;

[0030] Figure 8 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. Aerobic degassing channel; 5. Sedimentation zone; 6. Inlet ejector; 7. Primary throat; 8. Secondary throat; 9. Sludge return pipe; 10. Sludge hopper; 11. Aeration device; 12. Speed-maintaining section; 13. Premixing section; 14. First annular member; 15. Second annular member; 16. Third annular member; 17. Fourth annular member; 18. First baffle guide plate; 19. Second baffle guide plate; 20. First water return port; 21. Water passage; 22. First notch; 23. Second gap; 24, the third gap; 25, the fourth gap; 26, the fifth gap; 27, the sixth gap; 28, the mud slide; 29, the mud discharge pipe; 30, the water outlet trough; 31, the water outlet pipe; 32, the diversion channel; 33, the fifth annular part; 34, the secondary aerobic zone; 35, the seventh gap; 36, the eighth gap; 37, the aerator; 38, the premixing hood; 39, the first premixing zone; 40, the second return water port; 41, the fairing; 42, the second premixing zone; 43, the speed-retaining part; 44, the baffle; 45, the toothed mouth; 46, 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-stage self-sustaining aerobic granular sludge device, comprising: a body 1, and anoxic zone 2, primary aerobic zone 3 and sedimentation zone 5 arranged in sequence in the body 1 along the water flow path; a water acceleration device arranged in the anoxic zone 2, the water acceleration device comprising a water inlet ejector 6 and a throat, the inlet of the water inlet ejector 6 is suitable for being connected to an external sewage source, and the water inlet ejector 6 at least partially extends into the throat; the water is released into the anoxic zone 2 after being accelerated by the water inlet ejector 6 and the throat, so that a negative pressure environment is formed in the throat; a sludge return pipe 9, one end of which is connected to the sedimentation zone 5, and the other end is connected to the throat, so as to utilize the negative pressure in the throat The sludge in the sedimentation zone 5 is transported to the anoxic zone 2 under pressure; the upstream flow channel area of ​​the primary aerobic zone 3 is smaller than the downstream flow channel area, and an aeration device 11 is provided in the upstream flow channel of the primary aerobic zone 3; the inlet of the primary aerobic zone 3 is connected with the outlet of the anoxic zone 2, and the outlet of the primary aerobic zone 3 is divided into a first branch and a second branch, the first branch is connected with the anoxic zone 2, and the second branch is connected with the sedimentation zone 5; wherein, the external sewage enters the anoxic zone 2 and then flows to the primary aerobic zone 3, and the primary aerobic zone 3, under the action of the aeration device 11, utilizes the gas lift effect generated by the rising gas to transport the nitrified liquid in the primary aerobic zone 3 to the anoxic zone 2 through the first branch.

[0038] The multi-stage self-sustaining aerobic granular sludge device provided in this embodiment forms a negative pressure environment in the throat of the anoxic zone 2, and uses the deadweight of the sludge in the sedimentation zone 5 and the negative pressure in the throat to transport the sludge in the sedimentation zone 5 to the anoxic zone 2 through the sludge return pipe 9. Compared with the prior art that uses a pump body and a pipeline to return the 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. At the same time, under the action of the aeration device 11, the primary aerobic zone 3 uses the gas lift effect generated by the rising gas to transport the nitrified liquid in the primary aerobic zone 3 to the anoxic zone 2 through the first branch. With this arrangement, there is no need to use a pump body and a pipeline to return the nitrified liquid, which is beneficial to energy saving and environmental protection and will not increase the burden of system maintenance.

[0039] Specifically, the multi-stage self-sustaining aerobic granular sludge device includes a body 1, and a first annular member 14, a second annular member 15, a third annular member 16 and a fourth annular member 17 arranged therein. Among them, the materials of the body 1, the first annular member 14, the second annular member 15, the third annular member 16 and the fourth annular member 17 can all be selected from carbon steel plates, aluminum alloy plates, enamel plates, stainless steel plates or assembled concrete plates, etc. The entire multi-stage self-sustaining aerobic granular sludge device is manufactured in a modular and standardized manner, and a modular assembled structure is prefabricated in the factory, and assembled on site into a sewage treatment plant.

[0040] The main body 1 may be a round tank or a square tank-shaped structure, which may be placed on the ground or buried underground, and the hollow area inside the main body 1 is used to treat sewage.

[0041] Among them, for the first annular member 14, the first annular member 14 can be arranged concentrically with the body 1, and the internal space of the first annular member 14 serves as the anoxic zone 2. A water inlet ejector 6 and a throat are arranged in the anoxic zone 2, one end of the water inlet ejector 6 is connected to an external sewage source through the water inlet pipe, and the other end of the water inlet ejector 6 extends into the throat. When in use, external sewage enters the water inlet ejector 6 through the water inlet pipe. The water inlet ejector 6 is a reducer with a water outlet smaller than the water inlet, which can accelerate the incoming water body, and the accelerated water body is sprayed into the throat and rises along the throat. After that, the water body diffuses from the water outlet at the top of the throat to the surroundings and enters the anoxic zone 2, and the water body flows downward under the action of gravity in the anoxic zone 2. For example, the throat can also be a pipe body with a reduced diameter section in the middle, so that the water body can be accelerated again after entering the throat, which is conducive to improving the mixing effect.

[0042] Among them, there can also be multiple throats, for example, a first-level throat 7 and a second-level throat 8 can be set, and the first-level throat 7 and the second-level throat 8 can be nested with each other. For example, the second-level throat 8 is located at the top, and the first-level throat 7 is located at the bottom. The water inlet injector 6 extends into the first-level throat 7. The first-level throat 7 and the second-level throat 8 can form a multi-stage acceleration effect.

[0043] For example, the bottom of the primary throat pipe 7 may be connected to the bottom of the body 1 , and a gap is left between the bottom of the secondary throat pipe 8 and the bottom of the body 1 to form the first water return port 20 .

[0044] Among them, for the second annular member 15 and the third annular member 16, the second annular member 15 can be arranged concentrically with the first annular member 14, and the second annular member 15 is located on the outer ring of the first annular member 14; the third annular member 16 can be arranged concentrically with the second annular member 15, and the third annular member 16 is located on the outer ring of the second annular member 15. The area between the second annular member 15 and the third annular member 16 forms a primary aerobic zone 3. Among them, after the water in the anoxic zone 2 enters the first water return port 20, it is divided into a third branch and a fourth branch, the water in the third branch flows back to the throat again, and the water in the fourth branch flows downstream into the primary aerobic zone 3.

[0045] Among them, a diversion channel 32 and a water passage 21 are arranged between the primary aerobic zone 3 and the anoxic zone 2. The water of the first branch flows back to the anoxic zone 2 along the diversion channel 32, and the water of the fourth branch flows into the primary aerobic zone 3 along the water passage 21.

[0046] The height of the first annular member 14 can be less than the height of the second annular member 15, and the first annular member 14 is located in the upper half of the body 1, and the area between the first annular member 14 and the second annular member 15 forms a guide channel 32. The lower area of ​​the guide channel 32 is provided with a first baffle guide plate 18 and a second baffle guide plate 19, wherein one end of the first baffle guide plate 18 is connected to the second annular member 15, and the other end extends between the primary throat 7 and the secondary throat 8, and the first notch 22 between the first baffle guide plate 18 and the first annular member 14 forms the outlet of the guide channel 32, and the first notch 22 connects the guide channel 32 with the anoxic zone 2.

[0047] The interval between the first baffle guide plate 18 and the secondary throat pipe 8 forms a first water return port 20, and the first baffle guide plate 18, the primary throat pipe 7, the body 1, the second baffle guide plate 19 and the second annular member 15 together form a water passage 21. At this time, the water passage 21 is basically located below the guide channel 32. When the water flows through the water passage 21, it first flows downward, hits the bottom of the body 1, and then flows upward, hits the first baffle guide plate 18, and then flows downward to the bottom of the primary aerobic zone 3.

[0048] A second gap 23 is left between the top of the second annular member 15 and the top of the body 1 to form an entrance of the guide channel 32 , and a third gap 24 is left between the bottom of the second annular member 15 and the bottom of the body 1 to form an outlet of the water passage 21 .

[0049] A fourth gap 25 is left between the top of the third annular member 16 and the top of the body 1 to form the entrance of the aerobic degassing channel 4, and a fifth gap 26 is left between the bottom of the third annular member 16 and the bottom of the body 1 to allow the water in the aerobic degassing channel 4 to flow back into the primary aerobic zone 3.

[0050] Among them, for the primary aerobic zone 3, the lower half of the second annular member 15 and the third annular member 16 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 13 and a speed-maintaining section 12, and the speed-maintaining section 12 is located downstream of the premixing section 13; the flow channel area of ​​the premixing section 13 gradually decreases in the direction close to the speed-maintaining section 12, for example, the premixing section 13 can be designed as a conical structure, and the aeration device 11 is arranged in the premixing section 13; a second notch 23 and a fifth notch 26 are left between the end of the premixing section 13 away from the speed-maintaining section 12 and the bottom wall of the body 1, so that the water in the anoxic zone 2 and the aerobic degassing channel 4 can enter the primary aerobic zone 3. Among them, the downstream flow channel of the primary aerobic zone 3 is provided with a plurality of aeration devices 11. Under the action of air lift, the nitrified liquid in the primary aerobic zone 3 is transported to the anoxic zone 2 through the diversion channel 32 and the first gap 22. Moreover, the rising velocity of the water body upstream of the primary aerobic zone 3 is high, and the downstream velocity is low, so that the raw water entering the primary aerobic zone 3 is quickly mixed and risen, and then comprehensively treated in the low-speed zone in the middle and upper part, which is beneficial to improving the sewage treatment effect.

[0051] Among them, for the fourth ring member 17, the fourth ring member 17 can be arranged concentrically with the third ring member 16, and the fourth ring member 17 is located at the outermost ring of the third ring member 16, the area between the fourth ring member 17 and the body 1 forms a sedimentation zone 5, and the area between the fourth ring member 17 and the third ring member 16 forms an aerobic degassing channel 4. A sixth gap 27 is left between the bottom of the fourth ring member 17 and the bottom of the body 1, so that the water in the aerobic degassing channel 4 can enter the sedimentation zone 5 through the sixth gap 27. In this way, the sedimentation zone 5 is in the outermost ring, and the principle of combining mud layer filtration and vertical flow sedimentation is adopted, with mud layer filtration in the lower part and vertical flow sedimentation in the upper part. First, most of the suspended matter is intercepted by the middle and lower parts, and then the residual suspended matter is gradually precipitated through the elevation.

[0052] Among them, since the third annular member 16 is concave toward the center direction of the primary aerobic zone 3, the flow channel area of ​​the lower region of the primary aerobic zone 3 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 4 is larger than the upstream flow channel area of ​​the aerobic degassing channel 4. In this way, for the aerobic degassing channel 4, the lower part becomes larger, the flow rate becomes slower, the gas release is better, and the degassing effect is good.

[0053] Among them, a plurality of sludge return pipes 9 are also arranged in the main body 1, one end of the sludge return pipe 9 is connected to the sedimentation zone 5, and the other end is connected to the primary throat pipe 7, so that the sludge in the sedimentation zone 5 can flow back to the anoxic zone 2. For example, the pipe section of each sludge return pipe 9 located in the sedimentation zone 5 can be an elbow pipe, and a sludge hopper 10 is arranged at the end of the elbow pipe, and the opening of the sludge hopper 10 is arranged upward. For example, the sludge hopper 10 can be located in the lower half of the sedimentation zone 5. In this way, the sludge in the sedimentation zone 5 can be returned to the anoxic zone 2 without the need to set up external power equipment. Moreover, the sludge hopper 10 is suspended in the middle and lower part of the sedimentation zone 5, and can collect some sludge with good sedimentation properties and low oxygen content to supplement the sludge in the anoxic zone 2.

[0054] There may be a plurality of sludge hoppers 10, and correspondingly, the same number of sludge return pipes 9 are also provided. For example, four sludge hoppers 10 may be provided.

[0055] Among them, the body 1 is also provided with a mud slide 28, which is inclined toward the direction of the sixth notch 27 and arranged at the bottom of the sedimentation zone 5 to form a sludge return chute, wherein the fifth notch 26 and the sixth notch 27 are connected, and the sludge in the sludge return chute is diluted by the water body returning in the aerobic degassing channel 4 before flowing into the primary aerobic zone 3 and then enters the primary aerobic zone 3. In this way, under the action of the sludge return chute, the sludge in the sedimentation zone 5 can slide to the bottom of the primary aerobic zone 3, and at the same time, the mixture returning in the aerobic degassing channel 4 can dilute the sludge sliding down in the sedimentation zone 5 (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 primary aerobic zone 3 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 primary aerobic zone 3 and greatly improves the impact load resistance of the aerobic zone.

[0056] 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 5. After sedimentation and filtration in the sedimentation area 5, 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.

[0057] A mud discharge pipe 29 is also provided, one end of which passes through the mud sliding plate 28 and is connected to the bottom of the sedimentation area 5 , and the other end of which extends to the outside of the body 1 to discharge the remaining sludge in the sedimentation area 5 .

[0058] like Figure 2As shown, in one embodiment, a fifth annular member 33 is further provided in the body 1, the fifth annular member 33 is concentrically arranged with the fourth annular member 17, and the fifth annular member 33 is located at the outer ring of the fourth annular member 17, the area between the fifth annular member 33 and the body 1 forms a sedimentation zone 5, and the area between the fifth annular member 33 and the fourth annular member 17 forms a secondary aerobic zone 34. A seventh notch 35 is left between the bottom of the fifth annular member 33 and the bottom of the body 1 to form a first outlet of the secondary aerobic zone 34, and an eighth notch 36 is left between the top of the fourth annular member 17 and the fifth annular member 33 to form a second outlet of the secondary aerobic zone 34.

[0059] The inlet of the secondary aerobic zone 34 is connected to the fifth branch, the first outlet of the secondary aerobic zone 34 is connected to the sedimentation zone 5, and the second outlet of the secondary aerobic zone 34 is connected to the aerobic degassing channel 4. Since the bottom of the primary aerobic zone 3, the bottom of the aerobic degassing channel 4, the bottom of the secondary aerobic zone 34 and the bottom of the sedimentation zone 5 are all connected, at this time, a part of the water in the aerobic degassing channel 4 enters the primary aerobic zone 3, and another part of the water enters the secondary aerobic zone 34 and the sedimentation zone 5, and a part of the water entering the secondary aerobic zone 34 can return to the aerobic degassing channel 4 through the second outlet. In this way, when treating sewage with a high concentration of pollutants, the pollutants that have not been treated in the primary aerobic zone 3 will be treated in the secondary aerobic zone 34, and there will be a crossover of nitrification liquid between the primary aerobic zone 3 and the secondary aerobic zone 34, so that part of the nitrification liquid in the secondary aerobic zone 34 can be returned to the anoxic zone 2, further improving the removal rate of total nitrogen in the sewage in the anoxic zone 2.

[0060] Among them, a sludge return chute is provided at the bottom of the sedimentation zone 5, and the sludge return chute is connected to the secondary aerobic zone 34; the water at the first outlet of the secondary aerobic zone 34 enters the sedimentation zone 5 through the sludge return chute; part of the sludge in the sedimentation zone 5 slides down through the sludge return chute and flows back to the secondary aerobic zone 34 through the first outlet of the secondary aerobic zone 34.

[0061] Among them, an inclined tube separation device can be set in the sedimentation area 5 to perform sedimentation separation on the water body to improve the water purification effect.

[0062] like Figure 3As shown, the aeration device 11 includes: an aerator 37, which is arranged in the primary aerobic zone 3 and / or the secondary aerobic zone 34 that needs aeration; wherein, a plurality of aerators 37 can be provided, and the aerators 37 can be arranged in a point-like manner in the primary aerobic zone 3 or the secondary aerobic zone 34, for example, a plurality of aerators 37 arranged in a point-like manner can be arranged in a ring. The aerators 37 can also be arranged in a strip-like manner in the primary aerobic zone 3 or the secondary aerobic zone 34, for example, a plurality of aerators 37 can be arranged in an array in rows or columns. The arrangement of the aerators 37 is not limited to the above two methods, and the actual arrangement of the aerators 37 can be designed as needed. The premixing hood 38 is arranged at the outlet end of the aerator 37, and the space between the premixing hood 38 and the aerator 37 forms the first premixing zone 39; a gap is left between the premixing hood 38 and the aerator 37 to form the second water return port 40, and the second water return port 40 connects the first premixing zone 39 with the space outside the first premixing zone 39; wherein, the flow area of ​​the release port of the premixing hood 38 is smaller than the flow area of ​​the water inlet of the premixing hood 38, so as to increase the pressure in the first premixing zone 39 under the aeration state. For example, the premixing hood 38 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 38 can also be a prism-shaped structure, with both ends open, the large end at the bottom, the small end at the top, and the small end used as a release port. The premixing hood 38 can be welded to the side wall of the primary aerobic zone 3 or the secondary aerobic zone 34 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 37 and fixed on the air pipe bracket of the aerator 37.

[0063] In the aeration device 11 provided in this embodiment, the aerator 37 releases air in the first premixing zone 39. Due to the rapid rise of bubbles, the water outside the first premixing zone 39 will be driven to enter the first premixing zone 39 through the second water return port 40. In addition, the release port just above the premixing cover 38 is reduced in diameter so that the pressure in the first premixing zone 39 increases, so that the bubbles are further mixed with the water flowing back through the second water return port 40, and the mixing effect will be better due to the increase in pressure. The mixed gas-water mixture is ejected through the release port and rises to the primary aerobic zone 3 or the secondary aerobic zone 34 outside the first premixing zone 39. With such a configuration, when the aeration device 11 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.

[0064] like Figure 4As shown, the aeration device 11 further includes a fairing 41, which is arranged at the release port of the premixing hood 38, and the end of the fairing 41 away from the premixing hood 38 is a sealing structure, and the inner diameter of the fairing 41 gradually decreases in the direction away from the premixing hood 38; the space between the fairing 41 and the premixing hood 38 forms a second premixing zone 42; a gap is left between the fairing 41 and the premixing hood 38 to form a diversion port 46, and the diversion port 46 connects the second premixing zone 42 with the space outside the second premixing zone 42. Wherein, the fairing 41 can be welded to the side wall of the primary aerobic zone 3 or the secondary aerobic zone 34 by arranging a connecting rod on the side wall. For example, the fairing 41 can be a conical structure with the top of the cone on the top. For another example, the premixing hood 38 can also be a prismatic structure with a smaller top surface on the top. Among them, the shape of the fairing 41 is adapted to the shape of the premixing cover 38. For example, when the premixing cover 38 is a truncated cone structure, the fairing 41 can be a conical structure. For example, when the premixing cover 38 is a prism structure, the fairing 41 can be a prismatic structure. When in use, the gas-water mixture in the first premixing zone 39 enters the second premixing zone 42 through the release port of the premixing cover 38, and the gas-water mixture in the second premixing zone 42 flows out through the diversion port 46 and is divided into two tributaries, one of which has a gas-water mixture moving toward the direction of the return water port, thereby forming a cycle, and the other has a gas-water mixture crossing the fairing 41 and flowing toward the downstream. Moreover, since the side wall of the fairing 41 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.

[0065] like Figure 8 As shown, a plurality of tooth-shaped openings 45 can be provided at the edge of the fairing 41, and the plurality of tooth-shaped openings 45 are distributed along the circumference of the fairing 41. Such a setting has two advantages: first, the tooth-shaped openings 45 can increase the mixing effect, because the flow velocities of the concave area and the convex area through the tooth-shaped openings 45 are different, which can increase the disturbance mixing effect; second, it has the function of cutting bubbles, which can make large bubbles become smaller bubbles, increase the contact area with water, and increase dissolved oxygen. In addition, the gas-water mixture has horizontal and downward reflux diversion momentum, which can further increase the mixing effect, and the downward diversion of the gas-water mixture will increase the mixing extension, prolong the effective contact time, and will not directly rise to the liquid surface.

[0066] like Figure 5As shown, in one embodiment, the aeration device 11 further includes a speed-keeping component 43, which is disposed between the premixing hood 38 and the fairing 41, and the end of the speed-keeping component 43 away from the fairing 41 is connected to the release port of the premixing hood 38. For example, when the premixing hood 38 is a truncated cone structure, the speed-keeping component 43 may be a round tube. When the premixing hood 38 is a prism-shaped structure, the speed-keeping component 43 may be a square tube, so as to match the shape of the premixing hood 38. When in use, the gas-water mixture flowing out of the release port of the premixing hood 38 can enter the speed-keeping component 43, and the speed of the gas-water mixture in the speed-keeping component 43 changes little, and a high flow rate can be maintained, and then released from the top outlet of the speed-keeping component 43 to the second premixing zone 42. In this arrangement, a section of the speed-keeping component 43 is added to the release port of the premixing hood 38, and this straight speed-keeping component 43 can keep the drainage force of the first premixing zone 39 relatively large. Because the speed-retaining component 43 increases the release port height of the premixing hood 38, the velocity of the gas-water mixture outside the premixing hood 38 is relatively low, and the velocity difference with the gas-water mixture in the first premixing zone 39 is relatively large, so the pressure difference is large. Compared with the case without the speed-retaining component 43, the velocity difference between the two is greater, so the drainage effect is better.

[0067] like Figure 6 As shown, the aeration device 11 further includes a baffle 44, which is arranged inside the fairing 41, and the plate surface of the baffle 44 is arranged opposite to the outlet of the speed-retaining member 43. When in use, the gas-water mixture released from the outlet at the top of the speed-retaining member 43 hits the baffle 44 and then diffuses to the surroundings. Such an arrangement can prevent the accumulation of gas bubbles on the top of the fairing 41, so that the gas is smoothly released into the water, thereby improving the gas-water mixing effect.

[0068] like Figure 7 As shown, in another embodiment, the aeration device 11 further includes a speed-retaining member 43 ; one end of the speed-retaining member 43 is connected to the release port of the premixing hood 38 , and the other end extends in a direction away from the premixing hood 38 .

[0069] 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-stage self-sustaining aerobic granular sludge device, characterized in that: include: A body (1), and an anoxic zone (2), a primary aerobic zone (3) and a sedimentation zone (5) sequentially arranged in the body (1) along a water flow path; A water acceleration device is arranged in the anoxic zone (2), the water acceleration device comprises a water inlet ejector (6) and a throat pipe, the inlet of the water inlet ejector (6) is suitable for being connected to an external sewage source, and the water inlet ejector (6) at least partially extends into the throat pipe; the water is accelerated by the water inlet ejector (6) and the throat pipe and then released into the anoxic zone (2), so that a negative pressure environment is formed in the throat pipe; A sludge return pipe (9), one end of which is connected to the sedimentation zone (5) and the other end of which is connected to the throat pipe, so as to utilize the negative pressure in the throat pipe to transport the sludge in the sedimentation zone (5) to the anoxic zone (2); The upstream flow channel area of ​​the primary aerobic zone (3) is smaller than the downstream flow channel area, and an aeration device (11) is provided in the upstream flow channel of the primary aerobic zone (3); the inlet of the primary aerobic zone (3) is connected to the outlet of the anoxic zone (2), and the outlet of the primary aerobic zone (3) is divided into a first branch and a second branch, the first branch is connected to the anoxic zone (2), and the second branch is connected to the sedimentation zone (5); The external sewage enters the anoxic zone (2) and then flows into the primary aerobic zone (3). Under the action of the aeration device (11), the primary aerobic zone (3) utilizes the gas lift effect generated by the rising gas to transport the nitrified liquid in the primary aerobic zone (3) to the anoxic zone (2) via the first branch.

2. The multi-stage self-sustaining aerobic granular sludge device according to claim 1, characterized in that: It also comprises a sludge hopper (10) connected to one end of the sludge return pipe (9) located in the sedimentation area (5); the opening of the sludge hopper (10) is arranged upward and is located in the lower half of the sedimentation area (5).

3. The multi-stage self-sustaining aerobic granular sludge device according to claim 1, characterized in that: The upstream flow channel of the primary aerobic zone (3) comprises a premixing section (13) and a speed-maintaining section (12) connected to each other, and the speed-maintaining section (12) is located downstream of the premixing section (13); The flow channel area of ​​the premixing section (13) gradually decreases in a direction approaching the speed-maintaining section (12), and the aeration device (11) is arranged in the premixing section (13); A gap is left between the end of the premixing section (13) away from the speed-maintaining section (12) and the bottom of the body (1), so that the water in the anoxic zone (2) can enter the primary aerobic zone (3).

4. The multi-stage self-sustaining aerobic granular sludge device according to claim 1, characterized in that: The body (1) is further provided with a guide channel (32), the inlet of the guide channel (32) being connected to a first branch at the outlet of the primary aerobic zone (3), and the outlet of the guide channel (32) being connected to the anoxic zone (2), so that the nitrified liquid in the primary aerobic zone (3) enters the anoxic zone (2) through the guide channel (32).

5. The multi-stage self-sustaining aerobic granular sludge device according to claim 1, characterized in that: A gap is left between the bottom of the throat pipe and the bottom of the body (1) to form a first water return port (20), and the water in the anoxic zone (2) is divided into a third branch and a fourth branch after passing through the first water return port (20); The third branch is connected to the throat, so that a portion of the water in the anoxic zone (2) flows back into the throat through the third branch; The fourth branch is connected to the primary aerobic zone (3), so that another part of the water in the anoxic zone (2) flows into the primary aerobic zone (3) through the fourth branch.

6. The multi-stage self-sustaining aerobic granular sludge device according to claim 5, characterized in that: A water passage (21) is also provided in the body (1), the inlet of the water passage (21) being connected to the fourth branch, and the outlet of the water passage (21) being connected to the primary aerobic zone (3), so that a part of the water in the anoxic zone (2) enters the primary aerobic zone (3) through the water passage (21).

7. The multi-stage self-sustaining aerobic granular sludge device according to claim 1, characterized in that: The body (1) is also provided with an aerobic degassing channel (4), the inlet of the aerobic degassing channel (4) is connected to the second branch at the outlet of the primary aerobic zone (3), the outlet of the aerobic degassing channel (4) is divided into a fifth branch and a sixth branch, a part of the water in the aerobic degassing channel (4) enters the sedimentation zone (5) along the fifth branch, and another part of the water in the aerobic degassing channel (4) flows back to the primary aerobic zone (3) along the sixth branch.

8. The multi-stage self-sustaining aerobic granular sludge device according to claim 7, characterized in that: A sludge return chute is provided at the bottom of the sedimentation zone (5), and the sludge return chute is connected to the aerobic degassing channel (4) and the primary aerobic zone (3); The water of the fifth branch enters the sedimentation area (5) through the sludge return chute; Part of the sludge in the sedimentation zone (5) slides down through the sludge return chute and mixes with the water from the sixth branch before returning to the primary aerobic zone (3).

9. The multi-stage self-sustaining aerobic granular sludge device according to claim 7, characterized in that: A secondary aerobic zone (34) is also provided in the body (1), the inlet of the secondary aerobic zone (34) is connected to the fifth branch, the first outlet of the secondary aerobic zone (34) is connected to the precipitation zone (5), and the second outlet of the secondary aerobic zone (34) is connected to the aerobic degassing channel (4).

10. The multi-stage self-sustaining aerobic granular sludge device according to claim 9, characterized in that: A sludge return chute is provided at the bottom of the sedimentation zone (5), and the sludge return chute is connected to the secondary aerobic zone (34); The water at the first outlet of the secondary aerobic zone (34) enters the sedimentation zone (5) through the sludge return chute; Part of the sludge in the sedimentation zone (5) slides down through the sludge return chute and flows back into the secondary aerobic zone (34) through the first outlet of the secondary aerobic zone (34).

11. The multi-stage self-sustaining aerobic granular sludge device according to claim 9, characterized in that: The aeration device (11) comprises: an aerator (37), arranged in the primary aerobic zone (3) and / or the secondary aerobic zone (34); A premixing hood (38) is arranged at the air outlet end of the aerator (37), and the space between the premixing hood (38) and the aerator (37) forms a first premixing zone (39); a gap is left between the premixing hood (38) and the aerator (37) to form a second water return port (40), and the second water return port (40) communicates with the first premixing zone (39) and the space outside the first premixing zone (39); wherein the flow area of ​​the release port of the premixing hood (38) is smaller than the flow area of ​​the water inlet of the premixing hood (38), so as to increase the pressure in the first premixing zone (39) under the aeration state.

12. The multi-stage self-sustaining aerobic granular sludge device according to claim 11, characterized in that: It also includes a fairing (41) which is arranged at the release port of the premixing cover (38), the end of the fairing (41) away from the premixing cover (38) is a sealing structure, and the inner diameter of the fairing (41) gradually decreases in a direction away from the premixing cover (38); The space between the fairing (41) and the premixing cover (38) forms a second premixing zone (42); A gap is left between the fairing (41) and the premixing cover (38) to form a flow splitter (46), and the flow splitter (46) communicates with the second premixing zone (42) and a space outside the second premixing zone (42).

13. The multi-stage self-sustaining aerobic granular sludge device according to claim 12, characterized in that: A plurality of tooth-shaped openings (45) are arranged at the edge of the fairing opening of the fairing (41), and the plurality of tooth-shaped openings (45) are distributed along the circumference of the fairing (41).

14. The multi-stage self-sustaining aerobic granular sludge device according to claim 12, characterized in that: It also includes a speed-retaining component (43) disposed between the premixing cover (38) and the fairing (41), and one end of the speed-retaining component (43) away from the fairing (41) is connected to a release port of the premixing cover (38).

15. The multi-stage self-sustaining aerobic granular sludge device according to claim 14, characterized in that: It also includes a baffle (44) which is arranged inside the fairing (41), and the plate surface of the baffle (44) is arranged facing the outlet of the speed-retaining component (43).

16. The multi-stage self-sustaining aerobic granular sludge device according to claim 11, characterized in that: Also includes a speed-retaining member (43); One end of the speed-retaining member (43) is connected to the release port of the premixing cover (38), and the other end extends in a direction away from the premixing cover (38).

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