Multiphase multi-set aerobic granular sludge device

Abstract

The invention relates to the technical field of sewage treatment, and provides a multiphase multi-set aerobic granular sludge device which comprises a body, and the body is internally at least provided with an anoxic zone, a first-stage aerobic zone and a second-stage aerobic zone which are arranged along a water body flowing path; 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 invention, through the structural layout design of the first-stage aerobic zone and the anoxic zone and in combination with the water distribution mode of the water distribution bin, a pump body is not required to be matched with a pipeline for nitrification liquid backflow, and an accelerating device is not required to be arranged for accelerating inlet water; energy conservation and environmental protection are facilitated, and the system maintenance burden is not increased.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a multiphase, multi-set aerobic granular sludge device. Background Technology

[0002] Existing aerobic reactors mainly consist of an anoxic zone, an aerobic zone, and a sedimentation zone arranged sequentially along the wastewater flow path. Raw wastewater enters the anoxic zone, where it is diluted and mixed with microorganisms for anoxic reaction. The wastewater then enters the aerobic zone for further aerobic reaction to remove pollutants. Finally, the wastewater enters the sedimentation zone for sedimentation and separation. The downstream aerobic zone contains a large amount of nitrified liquid; therefore, this nitrified liquid can be transported back to the upstream anoxic zone for denitrification to remove total nitrogen from the wastewater. Current technologies typically use pumps and pipelines for nitrified liquid recirculation; however, this design is not energy-efficient and environmentally friendly, and it increases the burden of system maintenance. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that the traditional aerobic reaction device uses a pump body and pipeline for nitrification liquid reflux. However, such a design is not conducive to energy saving and environmental protection and will increase the burden of system maintenance. Therefore, a multiphase multi-set aerobic granular sludge device is provided.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0005] This invention provides a multiphase, multi-set aerobic granular sludge device, comprising: a main body, the interior of which is provided with at least an anoxic zone, a primary aerobic zone, and a secondary aerobic zone arranged along a water flow path; a water distribution tank, disposed within the anoxic zone and arranged in a ring around the circumference of the primary aerobic zone, the inlet of the water distribution tank being adapted to be connected to an external wastewater source, and the outlet of the water distribution tank being connected to the anoxic zone, the water distribution tank conveying water to the anoxic zone through a ring-shaped water distribution method; the outlet of the anoxic zone is divided into a first branch and a second branch, the inlet of the primary aerobic zone being connected to the first branch, and a portion of the water from the anoxic zone entering the primary aerobic zone via the first branch; the outlet of the primary aerobic zone being connected to the inlet of the anoxic zone, so that nitrified liquid in the primary aerobic zone enters the anoxic zone; the inlet of the secondary aerobic zone being connected to the second branch, and another portion of the water from the anoxic zone entering the secondary aerobic zone via the second branch.

[0006] Furthermore, the outlet of the water distribution tank is provided with several water outlets.

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

[0008] Furthermore, the upstream channel of the primary aerobic zone includes a premixing section and a speed-maintaining section connected together, and the speed-maintaining section is located downstream of the premixing section; the channel area of ​​the premixing section gradually decreases along the direction close to the speed-maintaining section, and the aeration device is installed in the premixing section; a first gap is left between the 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 bottom inner wall of the anoxic zone, and the first guide plate is inclined toward the first gap to guide the water to move toward the first gap.

[0010] Furthermore, an opening is provided on the side wall near the bottom of the anoxic zone. A second guide plate is provided on the inner side wall of the anoxic zone at a position adapted to the opening, and a third guide plate is provided on the outer side wall of the anoxic zone at a position adapted to 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. The water from the second branch enters the secondary aerobic zone through the water passage. The second guide plate is arranged parallel to the first guide plate. The third guide plate extends towards the bottom of the secondary aerobic zone, guiding the water to flow towards the bottom of the secondary aerobic zone, after which the water veers over the third guide plate and flows upward.

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

[0012] Furthermore, the multiphase 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 portion of the water in the aerobic degassing channel enters the sedimentation zone through the third branch, and another portion 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; some 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 has a cylindrical can-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 within the main body, and are arranged sequentially from the inner circle to the outer circle as the primary aerobic zone, the anoxic zone, the secondary aerobic zone, the aerobic degassing channel, and the sedimentation zone.

[0015] Further, the aeration device includes: an aerator disposed in a primary aerobic zone and / or a secondary aerobic zone; a premixing hood covering the air outlet of the aerator, the space between the premixing hood and the aerator forming a first premixing zone; a gap is left between the premixing hood and the aerator to form a return water inlet, the return water inlet connecting 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 inlet of the premixing hood, so as to increase the pressure in the first premixing zone under aeration conditions.

[0016] Furthermore, the aeration device also includes a rectifier shroud covering the release port of the premixing shroud. The end of the rectifier shroud away from the premixing shroud is a sealed structure, and the inner diameter of the rectifier shroud gradually decreases in the direction away from the premixing shroud. The space between the rectifier shroud and the premixing shroud forms a second premixing zone. A gap is left between the rectifier shroud and the premixing shroud to form a diversion port, which connects the second premixing zone with the space outside the second premixing zone.

[0017] Furthermore, the fairing has a plurality of second toothed openings along its circumferential edge.

[0018] Furthermore, the aeration device also includes a speed-maintaining component disposed between the premixing hood and the rectifier hood, and the end of the speed-maintaining component away from the rectifier hood is connected to the release port of the premixing hood.

[0019] Furthermore, the aeration device also includes a baffle plate disposed inside the shroud, with the baffle plate surface facing the outlet of the speed-maintaining component.

[0020] Furthermore, the aeration device also includes a speed-maintaining component; one end of the speed-maintaining component is connected to the release port of the premixing hood, and the other end extends in a direction away from the premixing hood.

[0021] The technical solution of this invention has the following advantages:

[0022] The multiphase, multi-set aerobic granular sludge device provided by this invention comprises a primary aerobic zone and a secondary aerobic zone. The secondary aerobic zone is located downstream of the anoxic zone and maintains its existing function. The primary aerobic zone and the anoxic zone are interconnected. Furthermore, a ring-shaped water distribution chamber is positioned within the anoxic zone to achieve a ring-shaped water distribution method. The weight of the water forces a portion of the water from the anoxic zone into the primary aerobic zone. As the water circulates between the primary and anoxic zones, it drives the nitrified liquid from the primary aerobic zone into the anoxic zone, where denitrification occurs to remove total nitrogen from the wastewater. This design, through the structural layout of the primary aerobic and anoxic zones and the water distribution method of the distribution chamber, eliminates the need for pumps and pipelines for nitrified liquid recirculation and the need for acceleration devices to speed up the influent, thus promoting energy conservation and environmental protection without increasing the burden of system maintenance. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a multiphase, multi-set aerobic granular sludge device in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of an aeration device according to one embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of an aeration device in another embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of an aeration device in another embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of an aeration device in another embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of an aeration device in another embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the aerator placement in one embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[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 component; 8. Second annular component; 9. Third annular component; 10. Fourth annular component; 11. Water distribution tank; 12. Inlet plate; 13. Outlet; 14. First notch; 15. Second notch; 16. Third notch; 17. Fourth notch; 18. Fifth notch; 19. Sludge return chute; 20. 21. First guide plate; 22. Second guide plate; 23. Third guide plate; 24. Water passage; 25. Aeration device; 26. Premixing section; 27. Speed-maintaining section; 28. Water outlet trough; 29. ​​Water outlet pipe; 30. Water inlet pipe; 31. Aerator; 32. Premixing cover; 33. First premixing zone; 34. Return water outlet; 35. Straightening cover; 36. Second premixing zone; 37. Speed-maintaining component; 38. Baffle; 39. Second toothed inlet; 30. Diverter. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] Furthermore, 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 1As shown, this embodiment provides a multiphase, multi-set aerobic granular sludge device, including: a main body 1, the interior of which is provided with at least an anoxic zone 2, a primary aerobic zone 3, and a secondary aerobic zone 4 arranged along the water flow path; a water distribution tank 11, arranged in the anoxic zone 2 and in a ring around the circumference of the primary aerobic zone 3, the inlet of the water distribution tank 11 being connected to an external sewage source through an inlet pipe 29, and the outlet of the water distribution tank 11 being connected to the anoxic zone 2, the water distribution tank 11 distributing water through a ring... The method involves transporting water to the anoxic zone 2; 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 portion of the water from 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 nitrified liquid in the primary aerobic zone 3 enters the anoxic zone 2; the inlet of the secondary aerobic zone 4 is connected to the second branch, and another portion of the water from the anoxic zone 2 enters the secondary aerobic zone 4 through the second branch.

[0038] The multiphase, multi-set aerobic granular sludge device provided in this embodiment is configured with a primary aerobic zone 3 and a secondary aerobic zone 4. The secondary aerobic zone 4 is located downstream of the anoxic zone 2 and maintains its existing function. The primary aerobic zone 3 and the anoxic zone 2 are interconnected. Furthermore, an annular water distribution chamber 11 is set within the anoxic zone 2 to achieve an annular water distribution method. Utilizing the weight of the water and the airlift effect of the primary aerobic zone 3, a portion of the water in the anoxic zone 2 is forced into the primary aerobic zone 3. As the water circulates between the primary aerobic zone 3 and the anoxic zone 2, it drives the nitrified liquid in the primary aerobic zone 3 into the anoxic zone 2, where denitrification occurs to remove total nitrogen from the wastewater. This configuration, through the structural layout design of the primary aerobic zone 3 and the anoxic zone 2, combined with the water distribution method of the water distribution chamber 11, eliminates the need for pumps and pipelines for nitrified liquid recirculation and the need for acceleration devices to accelerate the influent flow, thus promoting energy conservation and environmental protection without increasing the burden of system maintenance.

[0039] Specifically, this multiphase, multi-set aerobic granular sludge treatment unit includes: a main body 1, which can be a circular, square, or other various shaped tank structure. For example, the main body 1 is a circular tank structure, which can be installed above ground or buried underground. The hollow area inside the main body 1 is used for wastewater treatment. The main body 1 contains concentrically arranged first annular components 7, 8, 9, and 10, from the inside out. The materials of the first annular components 7, 8, 9, and 10 can be carbon steel, aluminum alloy, enamel, stainless steel, or precast concrete, etc. The entire multiphase, multi-set aerobic granular sludge treatment unit is modularly and standardized, with modular prefabricated structures in the factory and assembled on-site into a wastewater treatment plant. Compared to traditional wastewater treatment plants, the construction period is significantly shortened, the construction impact is greatly reduced, and quality control is more stringent. The number of annular components can be increased as the volume of water to be treated increases.

[0040] The first annular component 7 is disposed within the main body 1, and the inner space of the first annular component 7 forms the primary aerobic zone 3. The lower half of the first annular component 7 can be recessed towards 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, with the speed-maintaining section 26 located downstream of the premixing section 25. The flow channel area of ​​the premixing section 25 gradually decreases towards the speed-maintaining section 26; for example, the premixing section 25 can be designed as a conical structure, and the aeration device 24 is disposed within 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 main body 1, allowing water from the first branch to enter the primary aerobic zone 3 through the first gap 14.

[0041] The downstream channel of the primary aerobic zone 3 is equipped with several aeration devices 24. Under the action of air lifting, the upstream water velocity of the primary aerobic zone 3 is high, while the downstream velocity is low, causing the raw water entering the primary aerobic zone 3 to mix and rise rapidly, and then undergo comprehensive treatment in the low-velocity zone in the middle and upper part. The water distribution tank 11 can be set in the inward recessed area of ​​the first annular component 7, thereby improving the space utilization efficiency within the main body 1.

[0042] Among them, a first guide plate 20 is provided on the bottom inner wall of the anoxic zone 2, and the first guide plate 20 is inclined toward the first gap 14 to guide the water to move toward the first gap 14.

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

[0044] An annular inlet plate 12 is provided on the outer wall of the first annular component 7. The space between the annular inlet plate 12 and the first annular component 7 forms an annular water distribution chamber 11. Several outlets 13 are provided on the bottom edge of the annular inlet plate 12 that contacts the first annular component 7, so that the water in the annular water distribution chamber 11 can enter the anoxic zone 2 through the outlets 13. The inlet of the annular water distribution chamber 11 can be connected to an external sewage source through an inlet pipe 29. In use, the external sewage first enters the annular water distribution chamber 11 through the inlet pipe 29. Then, the water in the water distribution chamber 11 enters the anoxic zone 2 through the outlets 13. After that, a part of the water in the anoxic zone 2 enters the primary aerobic zone 3 through the first gap 14. After the water flows through the primary aerobic zone 3, it re-enters the anoxic zone 2 through the second gap 15. The water circulates to improve the mixing effect and sends the nitrified liquid in the primary aerobic zone 3 into the anoxic zone 2.

[0045] The outlet 13 can be a variety of outlet channels, such as a toothed opening, a round hole, a semi-circular hole, a square hole, or a gap in the entire channel.

[0046] The annular water distribution chamber 11 ensures uniform water distribution. Furthermore, the water's own weight allows it to flow out through the outlet 13, achieving an initial velocity without the need for additional water acceleration devices. This enables rapid mixing of the raw water and nitrifying solution within the anoxic zone 2, facilitating faster denitrification. Moreover, the small channels between the outlets 13 create a pressure difference between the high flow velocity and the relatively low velocity of the surrounding water, enhancing mixing and resulting in more uniform water distribution.

[0047] The third annular component 9 is disposed within the main body 1, and the space between the third annular component 9 and the second annular component 8 forms a secondary aerobic zone 4. The second annular component 8 has an opening on its side wall near the bottom of the main body 1. A second guide plate 21 is disposed on the side wall of the second annular component 8 facing the first annular component 7, and a third guide plate 22 is disposed on the side wall of the second annular component 8 facing the third annular component 9. The second guide plate 21, the opening, the third guide plate 22, and the second annular component 8 together form a water passage 23, which connects the anoxic zone 2 and the secondary aerobic zone 4. In use, water entering the anoxic zone 2 from the primary aerobic zone 3 mixes with raw water from the distribution tank 11. Part of the water enters the primary aerobic zone 3 through the first opening 14, while the other part enters the secondary aerobic zone 4 through the water passage 23. Furthermore, under the action of the water passage 23, the water is guided to flow towards the bottom of the secondary aerobic zone 4, and then the water veers over the third guide plate 22 and flows upwards. With this design, the water passage 23 serves two purposes: firstly, it allows for high-level water flow, preserving the sludge microorganisms in the anoxic zone 2; secondly, it extends to the lower channel of the aeration device 24 on the left side to guide the flow through the air. Furthermore, because the water passage 23 is annular, the guiding effect allows the water to flow more evenly around the perimeter, rather than in localized areas.

[0048] Specifically, for the third annular component 9, the lower half of the third annular component 9 is recessed towards 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 that of the primary aerobic zone 3. The aeration device 24 in the secondary aerobic zone 4 is also set in the premixing section 25. Under the action of air lift, the upstream water velocity of the secondary aerobic zone 4 will be high and the downstream velocity will be low, so that the water entering the secondary aerobic zone 4 will be rapidly mixed and rise, and then be 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 flow rate and increase the flow of surrounding water into the primary aerobic zone 3 and the secondary aerobic zone 4.

[0051] The fourth annular component 10 is disposed within the main body 1. The area between the fourth annular component 10 and the third annular component 9 forms an aerobic degassing channel 5, and the area between the fourth annular component 10 and the inner wall of the main body 1 forms a sedimentation zone 6. A third gap 16 is provided between the top of the third annular component 9 and the top of the main body 1, through which water from the secondary aerobic zone 4 enters the aerobic degassing channel 5. A fourth gap 17 is provided between the bottom of the fourth annular component 10 and the bottom of the main body 1, allowing water from the first branch of the aerobic degassing channel 5 to enter the sedimentation zone 6. A fifth gap 18 is provided between the bottom of the third annular component 9 and the bottom of the main body 1, allowing water from the second branch of the aerobic degassing channel 5 to flow back into the secondary aerobic zone 4 through the fifth gap 18.

[0052] The main body 1 is equipped with a sludge sliding plate, which is inclined towards the third gap 16 at the bottom of the sedimentation zone 6 to form a sludge return chute 19. The fourth gap 17 and the fifth gap 18 are connected. The sludge in the sludge return chute 19 is diluted by the water returning from the aerobic deaeration channel 5 before entering the secondary aerobic zone 4. With this configuration, the sludge in the sedimentation zone 6 can slide to the bottom of the aerobic zone under the action of the sludge return chute 19. At the same time, the mixture returning from the aerobic deaeration channel 5 can dilute the sludge sliding down the sedimentation zone 6 (the diluted sludge is more conducive to air lifting). The three are mixed and rise simultaneously in the lower part of the secondary aerobic zone 4 under the action of air lifting. Thus, the dilution of raw water and the replenishment of sludge in the sedimentation zone 6 occur in the same area, which improves the treatment efficiency of the secondary aerobic zone 4 and greatly enhances the aerobic zone's resistance to shock loads.

[0053] Specifically, because the lower half of the third annular component 9 is concave towards the center of the secondary aerobic zone 4, the flow channel area in the lower region of the secondary aerobic zone 4 is smaller than that in the upper region. Simultaneously, the downstream flow channel area of ​​the aerobic degassing channel 5 is larger than that in the upstream flow channel of the aerobic degassing channel 5. This configuration results in a larger flow area and lower flow velocity in the downstream flow channel of the aerobic degassing channel 5, leading to more gas release compared to a faster flow velocity.

[0054] The main body 1 is also equipped with a water outlet tank 27, which is located at the top of the sedimentation zone 6. After sedimentation and filtration in the sedimentation zone 6, the water enters the water outlet tank 27. Several water outlet pipes 28 are connected to the outside of the water outlet tank 27 to discharge the water in the water outlet tank 27 to the outside of the main body 1.

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

[0056] like Figure 2As shown, the aeration device 24 includes: aerators 30, disposed within the primary aerobic zone 3 and / or the secondary aerobic zone 4; wherein, multiple aerators 30 may be provided, and the aerators 30 may be arranged in a point pattern within the primary aerobic zone 3 and / or the secondary aerobic zone 4, for example, multiple point-arranged aerators 30 may be arranged in a ring. The aerators 30 may also be arranged in a strip pattern within the primary aerobic zone 3 and / or the secondary aerobic zone 4, for example, multiple aerators 30 may be arranged in a row or column array. The arrangement of the aerators 30 is not limited to the above two methods, and the actual arrangement of the aerators 30 can be designed according to needs. A premixing hood 31 is installed over the air outlet 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 return water inlet 33, which connects the first premixing zone 32 to the space outside the first premixing zone 32. The flow area of ​​the release port of the premixing hood 31 is smaller than the flow area of ​​the inlet of the premixing hood 31, so as to increase the pressure within the first premixing zone 32 under aeration conditions. For example, the premixing hood 31 can be a frustum-shaped structure with open ends, the larger end at the bottom and the smaller end at the top, with the smaller end used as the release port. Alternatively, the premixing hood 31 can also be a frustum-shaped structure with open ends, the larger end at the bottom and the smaller end at the top, with the smaller end used as the release port. The premix 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; or it can be installed as an integral structure with the air pipe support of the aerator 30 and fixed on the air pipe support of the aerator 30.

[0057] The aeration device 24 provided in this embodiment releases air from the aerator 30 in the first premixing zone 32. Due to the rapid rise of the bubbles, water outside the first premixing zone 32 is drawn into the zone through the return water inlet 33. Furthermore, the narrowing of the release port directly above the premixing hood 31 increases the pressure in the first premixing zone 32, further mixing the bubbles with the water returning through the return water inlet 33. The increased pressure further enhances the mixing effect. The resulting air-water mixture is then sprayed out through the release port and rises to the primary aerobic zone 3 or secondary aerobic zone 4 outside the first premixing zone 32. This configuration allows the aeration device 24 to increase the dissolved oxygen concentration through recirculation, mixing, and pressurization of dissolved gases during use, resulting in higher efficiency and greater energy savings under the same aeration conditions.

[0058] like Figure 3As shown, the aeration device 24 further includes a rectifier 34, which covers the release port of the premixing hood 31. The end of the rectifier 34 away from the premixing hood 31 is sealed, and the inner diameter of the rectifier 34 gradually decreases in the direction away from the premixing hood 31. The space between the rectifier 34 and the premixing hood 31 forms a second premixing zone 35. A gap is left between the rectifier 34 and the premixing hood 31 to form a diversion port 39, which connects the second premixing zone 35 to the space outside the second premixing zone 35. The rectifier 34 can be welded to the sidewall of the primary aerobic zone 3 and / or the secondary aerobic zone 4 by means of connecting rods provided on the sidewall. For example, the rectifier 34 can be a conical structure with the cone apex at the top. As another example, the premixing hood 31 can also be a prismatic structure with the smaller top surface at the top. The shape of the fairing 34 is adapted to the shape of the premixing fairing 31. For example, when the premixing fairing 31 is a frustum-shaped structure, the fairing 34 can be a conical structure. Similarly, when the premixing fairing 31 is a frustum-shaped structure, the fairing 34 can be a prism-shaped structure. 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 fairing 31. The gas-water mixture in the second premixing zone 35 flows out through the diversion port 39 and splits into two branches. One branch's gas-water mixture moves towards the return port 33, thus forming a circulation. The other branch's gas-water mixture flows downstream over the fairing 34. Furthermore, since the sidewall of the fairing 34 is inclined, it forms a slope. A portion of the gas-water mixture slides down the slope, mixing with the rapidly rising gas-water mixture, thereby improving the mixing effect.

[0059] like Figure 7 As shown, the edge of the fairing 34 can be provided with several second toothed orifices 38, which are distributed circumferentially along the fairing 34. This arrangement has two advantages: first, it enhances the mixing effect through the second toothed orifices 38 because the flow velocities in the concave and convex regions of the second toothed orifices differ, increasing the turbulent mixing effect; second, it has the function of cutting bubbles, breaking large bubbles into smaller ones, increasing the contact area with water, and thus increasing dissolved oxygen. Furthermore, the horizontal and downward backflow of the gas-water mixture further enhances the mixing effect, and the downward flow of the gas-water mixture increases the mixing distance, prolonging the effective contact time and preventing it from rising directly to the liquid surface.

[0060] like Figure 4As shown, in one embodiment, the aeration device 24 further includes a flow retainer 36 disposed between the premixing hood 31 and the rectifier hood 34, with the end of the flow retainer 36 away from the rectifier hood 34 connected to the release port of the premixing hood 31. For example, when the premixing hood 31 has a frustum-shaped structure, the flow retainer 36 can be a circular tube. When the premixing hood 31 has a frustum-shaped structure, the flow retainer 36 can be a square tube, thus adapting to the shape of the premixing hood 31. In use, the air-water mixture flowing out of the release port of the premixing hood 31 can enter the flow retainer 36. Within the flow retainer 36, the velocity change of the air-water mixture is small, maintaining a high flow rate, and then it is released from the top outlet of the flow retainer 36 to the second premixing zone 35. With this configuration, adding a flow retainer 36 to the release port of the premixing hood 31, this straight flow retainer 36 can maintain a large guiding force in the first premixing zone 32. Because the speed-maintaining component 36 increases the height of the release port of the premixing hood 31, the flow rate of the gas-water mixture outside the premixing hood 31 is relatively low, and the speed difference between it and the gas-water mixture in the first premixing zone 32 is relatively large, so the pressure difference is large. Compared with the absence of the speed-maintaining component 36, the speed difference between the two is even greater, so the diversion effect is better.

[0061] like Figure 5 As shown, the aeration device 24 also includes a baffle 37, which is disposed inside the shroud 34, with the baffle 37 facing the outlet of the retaining element 36. During use, the air-water mixture released from the outlet at the top of the retaining element 36 impacts the baffle 37 and then diffuses outwards. This arrangement prevents air from accumulating at the top of the shroud 34, thus preventing bubble aggregation and ensuring smooth gas release into the water, thereby improving the air-water mixing effect.

[0062] like Figure 6 As shown, in another embodiment, the aeration device 24 further includes a speed-maintaining component 36; one end of the speed-maintaining component 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] In operation: After raw water enters the distribution tank 11, it flows out from the outlet at the bottom of the distribution tank 11. 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. Under the action of air lifting and propulsion, the water flows upward and finally returns to the anoxic zone 2 through the second gap 15. During this period, the nitrified 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. After completing the reaction, the water enters the aerobic deaeration channel 5 through the third gap 16. The water in the aerobic deaeration channel 5 is divided into a third branch and a fourth branch at the outlet. The water in the third branch enters the sedimentation zone 6 through the fourth gap 17 and the sludge return chute 19. The water in the fourth branch mixes with the sludge sliding down from the sludge return chute 19 and flows back to the secondary aerobic zone 4. Sedimentation zone 6 is located in the outermost ring and employs a combination of mud layer filtration and vertical flow sedimentation. The mud layer at the bottom of sedimentation zone 6 filters the flowing water, while the water undergoes vertical flow sedimentation at the top. Most suspended solids are first intercepted in the middle and lower sections, and then residual suspended solids gradually settle due to elevation. The water treated in sedimentation zone 6 enters the effluent tank 27 and finally flows out to the outside of the main body 1 through the effluent pipe 28.

[0064] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A multiphase, multi-set aerobic granular sludge treatment device, characterized in that, include: The body (1) has at least an anoxic zone (2), a primary aerobic zone (3) and a secondary aerobic zone (4) arranged along the water flow path inside the body (1); A water distribution tank (11) is set in the anoxic zone (2) and arranged in a ring around the periphery of the primary aerobic zone (3). The inlet of the water distribution tank (11) is suitable for connection with an external sewage source, and the outlet of the water distribution tank (11) is connected to the anoxic zone (2). The water distribution tank (11) transports water to the anoxic zone (2) in a ring-shaped 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. A portion 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 nitrified liquid in the primary aerobic zone (3) enters the anoxic zone (2). The entrance to 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; The water distribution chamber (11) is provided with several water outlets (13) at its outlet.

2. The multiphase, multi-set aerobic granular sludge treatment device according to claim 1, 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 located in the upstream channel of the primary aerobic zone (3).

3. The multiphase, multi-set aerobic granular sludge treatment device according to claim 2, characterized in that, The upstream channel of the primary aerobic zone (3) includes a premixing section (25) and a speed-maintaining section (26) connected together, 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 along the direction close to the speed-maintaining section (26), and the aeration device (24) is disposed 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 main body (1) so that the water of the first branch enters the primary aerobic zone (3) through the first gap (14).

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

5. The multiphase, multi-set aerobic granular sludge treatment device according to claim 4, characterized in that, An opening is provided on the side wall near the bottom of the anoxic zone (2). A second guide plate (21) is provided on the inner side wall of the anoxic zone (2) at a position that matches the opening. A third guide plate (22) is provided on the outer side wall of the anoxic zone (2) at a position that matches 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). The water from the second branch enters the secondary aerobic zone (4) through the water passage (23). 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 to flow toward the bottom of the secondary aerobic zone (4), and then the water turns over the third guide plate (22) and flows upward.

6. The multiphase, multi-set aerobic granular sludge treatment 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 installed in the upstream channel of the secondary aerobic zone (4); The water passage (23) guides the water body to the upstream channel of the secondary aerobic zone (4).

7. The multiphase, multi-set aerobic granular sludge treatment device according to claim 1, characterized in that, It also includes an aerobic degassing channel (5) and a sedimentation 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, while 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 multiphase, multi-set aerobic granular sludge treatment device according to claim 7, characterized in that, The bottom of the sedimentation zone (6) is provided with a sludge return chute (19), and the sludge return chute (19) is connected to the aerobic degassing channel (5) and the secondary aerobic zone (4). The water from the third branch enters the sedimentation zone (6) via the sludge return chute (19); Some 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 flowing back to the secondary aerobic zone (4).

9. The multiphase, multi-set aerobic granular sludge treatment device according to claim 7, characterized in that, The main body (1) has a cylindrical structure. The primary aerobic zone (3), the hypoxic zone (2), the secondary aerobic zone (4), the aerobic degassing channel (5), and the sedimentation zone (6) are concentrically arranged within the main body (1), and are arranged sequentially from the inner circle to the outer circle as the primary aerobic zone (3), the hypoxic zone (2), the secondary aerobic zone (4), the aerobic degassing channel (5), and the sedimentation zone (6).

10. The multiphase, multi-set aerobic granular sludge treatment device according to claim 6, characterized in that, The aeration device (24) includes: Aerator (30) is installed in the primary aerobic zone (3) and / or the secondary aerobic zone (4); A premixing hood (31) is installed over the air outlet of the aerator (30). 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 return water inlet (33). The return water inlet (33) connects the first premixing zone (32) with the space outside the first premixing zone (32). The flow area of ​​the release port of the premixing hood (31) is smaller than the flow area of ​​the inlet of the premixing hood (31) to increase the pressure in the first premixing zone (32) under aeration conditions.

11. The multiphase, multi-set aerobic granular sludge treatment device according to claim 10, characterized in that, It also includes a fairing (34) which covers the release port of the premixed shield (31). The end of the fairing (34) away from the premixed shield (31) is a sealed structure, and the inner diameter of the fairing (34) gradually decreases in the direction away from the premixed shield (31). The space between the fairing (34) and the premixing fairing (31) forms a second premixing zone (35); A gap is left between the fairing (34) and the premixing fairing (31) to form a diversion port (39), which connects the second premixing zone (35) with the space outside the second premixing zone (35).

12. The multiphase, multi-set aerobic granular sludge treatment device according to claim 11, characterized in that, The fairing (34) has a plurality of second toothed openings (38) along its edge, and the plurality of second toothed openings (38) are distributed circumferentially along the fairing (34).

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

14. The multiphase, multi-set aerobic granular sludge treatment device according to claim 13, characterized in that, It also includes a baffle (37) disposed inside the fairing (34), with the baffle (37) facing the outlet of the speed-maintaining component (36).

15. The multiphase, multi-set aerobic granular sludge treatment device according to claim 10, characterized in that, It also includes speed-maintaining parts (36); One end of the speed-maintaining component (36) is connected to the release port of the premixed cover (31), and the other end extends in a direction away from the premixed cover (31).

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