A target self-circulation sludge granulation treatment device

Abstract

The present application relates to sewage treatment technical field, provide a kind of targeted self-circulation sludge granulation treatment device, comprising: body, body is sequentially provided with anoxic mixing zone, anaerobic zone, aerobic zone and sedimentation zone along the direction of hydraulic path;First partition, it is set in sedimentation zone, first partition divides the space in sedimentation zone into several independent chambers, and sludge filter bed is formed in each chamber when water flows through sedimentation zone;Sludge collecting hopper, sludge collecting hopper is arranged in each chamber, and the upper edge of sludge filter bed is slightly higher than the position of the edge of sludge collecting hopper;Sludge discharge pipe, one end is connected with sludge collecting hopper, and the other end extends to the outside of body.The device, by first partition, divides sedimentation zone into several independent chambers, when sludge is discharged from sludge collecting hopper in a chamber, the sludge filter bed of other chambers still maintains high position, ensures processing efficiency, and sludge discharge does not disturb other chambers, avoids affecting the function of sludge filter bed.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically to a targeted self-circulating sludge granulation treatment 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 and is diluted and mixed with the microorganisms therein 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 sedimentation zone contains a large amount of sludge. In existing technologies, sludge discharge can easily disrupt the stability of the sludge filter bed above the sludge collection hopper. This leads to a decrease in the height of the sludge filter bed, resulting in reduced treatment efficiency, and also increases disturbance within the sedimentation zone, further affecting the treatment effect of the sludge filter bed. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that the existing sewage treatment devices are prone to damaging the stability of the sludge filter bed above the sludge collection hopper when discharging sludge. On the one hand, this will cause the height of the sludge filter bed to decrease, resulting in a reduction in treatment efficiency. On the other hand, it will increase the disturbance in the sedimentation zone, which will also affect the treatment effect of the sludge filter bed. Therefore, the present invention provides a targeted self-circulating sludge granulation treatment device.

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

[0005] This invention provides a targeted self-circulating sludge granulation treatment device, comprising: a main body, wherein an anoxic mixing zone, an anaerobic zone, an aerobic zone, and a sedimentation zone are sequentially arranged along the hydraulic path within the main body; a first baffle plate disposed within the sedimentation zone, the first baffle plate dividing the space within the sedimentation zone into several independent chambers, wherein a sludge filter bed is formed in each chamber when water flows through the sedimentation zone; a sludge collection hopper, wherein each chamber is provided with a sludge collection hopper, and the sludge filter bed is slightly higher than the rim of the sludge collection hopper; and a sludge discharge pipe, one end of which is connected to the sludge collection hopper, and the other end extending to the outside of the main body.

[0006] Furthermore, the first baffle is located in the upper half of the sedimentation zone, the sludge hopper is located in the middle of the chamber, and the rim of the sludge hopper is higher than the bottom of the first baffle and does not exceed the top of the first baffle.

[0007] Furthermore, the targeted self-circulating sludge granulation treatment device also includes an inclined tube separation device, which is disposed in the upper half of the sedimentation zone; the bottom of the inclined tube separation device is connected to the top of the first partition.

[0008] Furthermore, the targeted self-circulating sludge granulation treatment device also includes a circulation densification device, which is located in the lower half of the sedimentation zone; the circulation densification device includes a densification tube and a first guide cone; the densification tube is arranged vertically, and the diameter of the inlet end of the densification tube is larger than the diameter of the outlet end; the first guide cone is located below the densification tube, and there is a gap between the guiding surface of the first guide cone and the outlet end of the densification tube.

[0009] Furthermore, the anoxic mixing zone is divided into a first mixing zone and a second mixing zone, with the outlet of the first mixing zone connected to the inlet of the second mixing zone. A water acceleration device is installed in the first mixing zone, which includes a throat and at least one nozzle. The throat covers the top of the nozzle, and external water is accelerated by the nozzle before entering the throat. The water is then released from the top of the throat into the first mixing zone. A sludge return hopper is installed in the second mixing zone, with its hopper edge positioned near the top of the second mixing zone. The outlet of the sludge return hopper is connected to the throat.

[0010] Furthermore, the targeted self-circulating sludge granulation treatment device also includes a sludge return pipe, one end of which is connected to the sludge collection hopper and the other end of which is connected to the throat pipe.

[0011] Furthermore, an aeration device is provided within the aerobic zone; the aeration device includes an aerator and an accelerator; the aerator is located at the bottom of the aerobic zone and is used to provide the gas required for the aerobic reaction; the accelerator includes a premixing hood and a speed-maintaining component; the premixing hood covers the air outlet 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 first return water inlet, which connects the interior and exterior spaces of 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; one end of the speed-maintaining component is connected to the release port of the premixing hood, and the other end extends away from the premixing hood.

[0012] Furthermore, the targeted self-circulating sludge granulation treatment device also includes a second baffle; the lower half of the aerobic zone is provided with the second baffle, which divides the lower half of the aerobic zone into multiple aeration zones, and the aeration device is provided in the aeration zone; the space between two adjacent aeration zones forms an internal return channel, and the bottom of the second baffle (32) has a gap connecting the aeration zone and the internal return channel, and the water in the internal return channel flows in the opposite direction to the water in the aeration zone; the bottom of the internal return channel is provided with a second guide cone to guide the water in the internal return channel back to the aeration zone.

[0013] Furthermore, the lower layer of the sludge filter bed formed in the sedimentation zone is a nitrification filter layer, and the upper layer is a denitrification filter layer; while the sludge filter bed filters the water, it uses the nitrification filter layer to remove ammonia nitrogen from the water and the denitrification filter layer to remove total nitrogen and COD from the water.

[0014] Furthermore, the body has a rectangular cross-sectional shape parallel to the horizontal plane, and the anoxic mixing zone, anoxic zone, aerobic zone, and sedimentation zone are concentrically arranged from the inner circle to the outer circle.

[0015] Furthermore, the body has a rectangular cross-sectional shape parallel to the horizontal plane; the anoxic mixing zone and the anoxic anaerobic zone are located in the left half of the region, and the anoxic mixing zone is located in the middle, with the anoxic mixing zone having anoxic anaerobic zones on its upper and lower sides respectively; the aerobic zone and the sedimentation zone are located in the right half of the region, and the aerobic zone is located in the middle, with the aerobic zone having sedimentation zones on its upper and lower sides respectively.

[0016] Furthermore, the body has a rectangular cross-sectional shape parallel to the horizontal plane; the anoxic mixing zone is located in the middle, and the upper and lower sides of the anoxic mixing zone are respectively anoxic zones; the left and right sides of the anoxic mixing zone are respectively aerobic zones, and the upper and lower sides of the aerobic zones are respectively sedimentation zones.

[0017] Furthermore, the body has a rectangular cross-sectional shape parallel to the horizontal plane; the anoxic mixing zone is located in the middle, and the upper and lower sides of the anoxic mixing zone are respectively anoxic zones; the left and right sides of the anoxic mixing zone are respectively sedimentation zones, and the upper and lower sides of the sedimentation zones are respectively aerobic zones.

[0018] Furthermore, the targeted self-circulating sludge granulation treatment device also includes a lifting agitator, which is set in the first mixing zone to accelerate the rise of water in the throat.

[0019] The technical solution of this invention has the following advantages:

[0020] The targeted self-circulating sludge granulation treatment device provided by the present invention divides the sedimentation area into several independent chambers through a first partition. When sludge is discharged from the sludge collection hopper in one chamber, the sludge filter beds in other chambers remain at a high position to ensure treatment efficiency. Moreover, the sludge discharge will not disturb other chambers and avoid affecting the function of the sludge filter beds. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic diagram of a targeted self-circulating sludge granulation treatment device in one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram showing the positional relationship between the effluent pipe and the sludge discharge pipe in a targeted self-circulating sludge granulation treatment device according to one embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram showing the positional relationship between the first baffle and the sludge collection hopper in a targeted self-circulating sludge granulation treatment device according to an embodiment of the present invention.

[0025] Figure 4 This is a cross-sectional view of a targeted self-circulating sludge granulation treatment device according to one embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the internal layout of a targeted self-circulating sludge granulation treatment device in one embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the first baffle in a targeted self-circulating sludge granulation treatment device according to one embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the circulation encryption device in a targeted self-circulating sludge granulation treatment device according to one embodiment of the present invention;

[0029] Figure 8 This is a magnified schematic diagram of a partial structure of the aerobic zone in a targeted self-circulating sludge granulation treatment device according to an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the aeration device in a targeted self-circulating sludge granulation treatment device according to one embodiment of the present invention.

[0031] Figure 10 This is a schematic diagram of the aeration device in a targeted self-circulating sludge granulation treatment device in another embodiment of the present invention.

[0032] Figure 11 This is a schematic diagram of the aeration device in a targeted self-circulating sludge granulation treatment device in another embodiment of the present invention.

[0033] Figure 12 This is a schematic diagram of the aeration device in a targeted self-circulating sludge granulation treatment device in another embodiment of the present invention.

[0034] Figure 13 This is a schematic diagram of the aerator layout in a targeted self-circulating sludge granulation treatment device according to one embodiment of the present invention;

[0035] Figure 14This is a top view of the internal layout of the targeted self-circulating sludge granulation treatment device in another embodiment of the present invention;

[0036] Figure 15 This is a top view of the internal layout of the targeted self-circulating sludge granulation treatment device in another embodiment of the present invention;

[0037] Figure 16 This is a top view of the internal layout of the targeted self-circulating sludge granulation treatment device in another embodiment of the present invention;

[0038] Figure 17 This is a schematic diagram of the water distribution channel in the targeted self-circulating sludge granulation treatment device in an embodiment of the present invention.

[0039] Figure 18 This is a schematic diagram of the sedimentation zone in a targeted self-circulating sludge granulation treatment device according to one embodiment of the present invention;

[0040] Figure 19 This is a schematic diagram of the sedimentation zone in a targeted self-circulating sludge granulation treatment device according to another embodiment of the present invention;

[0041] Figure 20 This is a schematic diagram of the sedimentation zone in a targeted self-circulating sludge granulation treatment device according to another embodiment of the present invention;

[0042] Figure 21 This is a schematic diagram of the sedimentation zone in a targeted self-circulating sludge granulation treatment device according to another embodiment of the present invention;

[0043] Figure 22 This is a schematic diagram of the lifting agitator in the targeted self-circulating sludge granulation treatment device in an embodiment of the present invention;

[0044] Figure 23 This is a schematic diagram of the lifting agitator in a variable density self-circulating sludge granulation device according to another embodiment of the present invention.

[0045] Figure 24 This is a schematic diagram of the lifting agitator in a variable density self-circulating sludge granulation device according to another embodiment of the present invention.

[0046] Figure 25 This is a schematic diagram of the lifting agitator in a variable density self-circulating sludge granulation device according to another embodiment of the present invention.

[0047] Figure 26 This is a schematic diagram of the lifting agitator in a variable density self-circulating sludge granulation device according to another embodiment of the present invention.

[0048] Figure 27 This is a schematic diagram of the lifting agitator in a variable density self-circulating sludge granulation device according to another embodiment of the present invention.

[0049] Figure 28 This is a schematic diagram of the lifting agitator in a variable density self-circulating sludge granulation device according to another embodiment of the present invention.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Main body; 2. First mixing zone; 3. Second mixing zone; 4. Anaerobic zone; 5. Aerobic zone; 6. Degassing channel; 7. Sedimentation zone; 8. Sludge hopper; 9. First baffle; 10. Inclined tube separator; 11. Water collection tank; 12. Outlet pipe; 13. Inlet pipe; 14. Sludge discharge pipe; 15. Aeration device; 16. Spray pipe; 17. Throat; 18. Sludge return hopper; 19. Sludge return pipe; 20. Circulation densification device; 21. Densification pipe; 22. First guide cone; 23. Anaerobic mixing zone; 4. Second baffle; 25. Internal return channel; 26. Aeration zone; 27. Speed-maintaining component; 28. Premixing hood; 29. ​​First premixing zone; 30. First return water inlet; 31. Aerator; 32. Second guide cone; 33. Regulator; 34. Baffle; 35. Second premixing zone; 36. Diversion port; 37. Toothed inlet; 38. Water distribution device; 39. Water distribution channel; 40. Water distribution channel inlet; 41. Water distribution hole; 42. Sludge return chamber; 43. Balance plate; 44. Sludge discharge hopper; 45. Lifting mixer. Detailed Implementation

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] like Figures 1 to 6 As shown, this embodiment provides a targeted self-circulating sludge granulation treatment device, including: a body 1, in which anoxic mixing zone 23, anaerobic zone 4, aerobic zone 5 and sedimentation zone 7 are arranged sequentially along the hydraulic path; a first baffle 9 is arranged in the sedimentation zone 7, which divides the space in the sedimentation zone 7 into several independent chambers, and a sludge filter bed is formed in each chamber when the water flows through the sedimentation zone 7; a sludge collection hopper 8 is arranged in each chamber, and the upper edge of the sludge filter bed can be slightly higher than the rim of the sludge collection hopper 8 so that a portion of the sludge can enter the sludge collection hopper 8; and a sludge discharge pipe 14, one end of which is connected to the sludge collection hopper 8 and the other end extends to the outside of the body 1.

[0057] The targeted self-circulating sludge granulation treatment device provided in this embodiment divides the sedimentation zone 7 into several independent chambers through the first partition 9. When sludge is discharged from the sludge collection hopper 8 in one chamber, the sludge filter bed in other chambers remains at a high position to ensure treatment efficiency. Moreover, the sludge discharge will not disturb other chambers and will not affect the function of the sludge filter bed.

[0058] The first baffle 9 is located in the upper half of the sedimentation zone 7, and the sludge hopper 8 is located in the middle of the chamber. The rim of the sludge hopper 8 is higher than the bottom of the first baffle 9 but does not exceed the top of the first baffle 9. For example, three sludge hoppers 8 can be arranged at intervals, with the rim of the middle sludge hopper 8 lower than the rims of the two side sludge hoppers 8.

[0059] The targeted self-circulating sludge granulation treatment device also includes an inclined tube separator 10, which is set in the upper half of the sedimentation zone 7. The bottom of the inclined tube separator 10 is connected to the top of the first partition 9. When the water in each chamber passes through the inclined tube separator 10 upwards, the sludge in the supernatant can be separated to ensure that the effluent is clear.

[0060] The targeted self-circulating sludge granulation treatment device also includes a water collection tank 11 and an outlet pipe 12. The water collection tank 11 is located in the sedimentation zone 7 and downstream of the inclined tube separator 10, and is used to collect the supernatant in the sedimentation zone 7. One end of the outlet pipe 12 is connected to the water collection tank 11, and the other end extends to the outside of the main body 1 for water discharge.

[0061] like Figure 7 As shown, several circulating sludge densification devices 20 can be installed in the lower half of the sedimentation zone 7. The top of the circulating sludge densification device 20 is lower than the bottom of the sludge collection hopper 8. The circulating sludge densification device 20 includes a densification pipe 21 and a first guide cone 22. The densification pipe 21 is vertically arranged, and the diameter of the inlet end of the densification pipe 21 is larger than the diameter of the outlet end. The first guide cone 22 is located below the densification pipe 21, directly facing the opening of the densification pipe 21, and there is a gap between the guiding surface of the first guide cone 22 and the outlet end of the densification pipe 21. With this arrangement, as the water on both sides of the densification pipe 21 rises, the sludge inside the densification pipe 21 flows out due to the flow velocity. Under the guidance of the first guide cone 22, it disperses to both sides again, and so on, so that the sludge is continuously densified.

[0062] The anoxic mixing zone 23 is divided into a first mixing zone 2 and a second mixing zone 3. The outlet of the first mixing zone 2 is connected to the inlet of the second mixing zone 3. A water acceleration device is installed in the first mixing zone 2, comprising a throat 17 and at least one nozzle 16. The throat 17 covers the top of the nozzle 16. External water is accelerated by the nozzle 16 and enters the throat 17, then is released from the top of the throat 17 into the first mixing zone 2. A sludge return hopper 18 is installed in the second mixing zone 3, with its hopper edge positioned near the top of the second mixing zone 3. The outlet of the sludge return hopper 18 is connected to the throat 17. Water from the first mixing zone 2 can be distributed to the bottom of the second mixing zone 3 via a water distribution pipe. External water can be connected to nozzle 16 through inlet pipe 13. After being accelerated by nozzle 16, external water enters throat 17 and is released at the top of throat 17. The water falls freely under the action of gravity. A return port is left between nozzle 16 and throat 17 so that some water can re-enter throat 17, while the other part of the water flows to the second mixing zone 3.

[0063] When the amount of water to be processed is large, multiple water acceleration devices can be installed in the first mixing zone 2 at the same time, and multiple water acceleration devices can be fed into the water at the same time to increase the amount of water fed in.

[0064] The sludge return hopper 18 in the second mixing zone 3 can collect anaerobic concentrated sludge and return it to the throat 17 to participate in the reaction again. An outlet connecting to the anoxic zone 4 is provided on the side wall near the top of the second mixing zone 3, allowing water from the second mixing zone 3 to enter the anoxic zone 4 from the top. An outlet connecting to the aerobic zone 5 is provided on the side wall near the bottom of the anoxic zone 4, allowing water from the anoxic zone 4 to enter the aerobic zone 5 from the bottom. A degassing channel 6 can also be provided between the aerobic zone 5 and the sedimentation zone 7. An outlet near the top of the side wall of the aerobic zone 5 near the degassing channel 6 allows a portion of the water from the aerobic zone 5 to enter the degassing channel 6 from the top. Simultaneously, an outlet near the top of the side wall of the aerobic zone 5 near the anoxic zone 4 allows another portion of the water from the aerobic zone 5 to return to the anoxic zone 4 from the top. An outlet connecting to the sedimentation zone 7 is provided on the side wall near the bottom of the degassing channel 6, and the water in the anaerobic zone 4 enters the sedimentation zone 7 from the bottom.

[0065] The targeted self-circulating sludge granulation treatment device also includes a sludge return pipe 19, one end of which is connected to the sludge collection hopper 8 and the other end of which is connected to the throat pipe 17. For example, the sludge discharge pipe 14 can be connected to the sludge return pipe 19, and a control valve can be installed at the outlet of the sludge discharge pipe 14. When the control valve is closed, the sludge in the sludge collection hopper 8 will only flow back into the throat pipe 17 and will not be discharged externally.

[0066] like Figure 8 As shown, an aeration device 15 is installed in the aerobic zone 5. The aeration device 15 includes an aerator 31 and an accelerator. The aerator 31 is located at the bottom of the aerobic zone 5 and is used to provide the gas required for the aerobic reaction. The accelerator includes a premixing hood 28 and a speed-maintaining component 27. The premixing hood 28 covers the air outlet of the aerator 31, and the space between the premixing hood 28 and the aerator 31 forms a first premixing zone 29. A gap is left between the premixing hood 28 and the aerator 31 to form a first return water inlet 30, which connects the interior and exterior spaces of the first premixing zone 29. The flow area of ​​the release port of the premixing hood 28 is smaller than the flow area of ​​the inlet of the premixing hood 28 to increase the pressure in the first premixing zone 29 under aeration conditions. One end of the speed-maintaining component 27 is connected to the release port of the premixing hood 28, and the other end extends away from the premixing hood 28.

[0067] For example, the premixing hood 28 can be a frustum-shaped structure with open ends at both the top and bottom, the larger opening at the bottom and the smaller opening at the top, with the smaller opening serving as the release port. Alternatively, the premixing hood 28 can also be a frustum-shaped structure with open ends at both the top and bottom, the larger opening at the bottom and the smaller opening at the top, with the smaller opening serving as the release port. The premixing hood 28 can be welded to the side wall of the aerobic zone 5 by means of connecting rods welded to its side wall; or it can be installed as an integral structure with the air pipe support of the aerator 31 and fixed to the air pipe support of the aerator 31. The velocity retainer 27 can be a round tube or a square tube, depending on the requirements. Because the velocity retainer 27 increases the height of the release port of the premixing hood 28, the flow velocity of the air-water mixture outside the premixing hood 28 is lower, resulting in a larger velocity difference between the air-water mixture outside the first premixing zone 29 and the premixing hood 28. Therefore, the pressure difference is greater, resulting in a better flow diversion effect compared to when the velocity retainer 27 is not present.

[0068] In operation, aerator 31 releases air into the first premixing zone 29. The rapid rise of the bubbles draws water from outside the zone into the first premixing zone 29 through the first return inlet 30. Additionally, the narrowing of the release port directly above the premixing hood 28 increases the pressure in the first premixing zone 29, further mixing the bubbles with the water returning through the first return inlet 30. The increased pressure also improves the dissolution of the gas into the water. The resulting air-water mixture is ejected from the release port and rises to the aerobic zone 5 outside the first premixing zone 29. The speed-maintaining component 27 prolongs the high-speed water movement time, delaying the release. This configuration allows the aeration device 15 to increase dissolved oxygen concentration through reflux, mixing, and pressurized gas dissolution during operation, resulting in higher efficiency and greater energy savings under the same aeration conditions.

[0069] The targeted self-circulating sludge granulation treatment device also includes a second baffle 24. The lower half of the aerobic zone 5 is equipped with the second baffle 24, which divides the lower half of the aerobic zone 5 into multiple aeration zones 26. An aeration device 15 is installed in each aeration zone 26. An internal return channel 25 is formed between two adjacent aeration zones 26. The bottom of the second baffle 24 has a gap connecting the aeration zone 26 and the internal return channel 25. The water in the internal return channel 25 flows in the opposite direction to the water in the aeration zone 26. During use, the air-lift effect of the aerator 31 can be used to accelerate water intake, resulting in a larger volume of return water, thereby accelerating the circulation and return between the internal return channel 25 and the aeration zone 26, allowing for rapid water mixing. Moreover, under the action of aeration, the water flow in the aeration zone 26 rises rapidly, and the heavy sludge will descend from the inner return channel 25 and then participate in the aeration upward process again, which makes the sludge particle formation efficiency faster. In addition, through this high-speed rise and fall, air and water scrubbing makes the granular sludge more stable and the granular sludge ball diameter ratio better.

[0070] The bottom of the internal return channel 25 is equipped with a second guide cone 32 to guide the water in the internal return channel 25 back to the aeration zone 26. This design can prevent sludge accumulation in the internal return channel 25 and facilitate the guidance of airlift flow.

[0071] like Figure 9 As shown, in one embodiment, the release port of the premixed hood 28 may not be equipped with a speed-keeping element 27.

[0072] like Figure 10 As shown, the aeration device 15 also includes a rectifier 33, which covers the release port of the premixing hood 28. The end of the rectifier 33 away from the premixing hood 28 is sealed, and the inner diameter of the rectifier 33 gradually decreases in the direction away from the premixing hood 28. The space between the rectifier 33 and the premixing hood 28 forms a second premixing zone 35. A gap is left between the rectifier 33 and the premixing hood 28 to form a diversion port 36, which connects the second premixing zone 35 to the space outside the second premixing zone 35. The rectifier 33 can be welded to the side wall of the aeration zone 26 by means of connecting rods provided on the side wall. For example, the rectifier 33 can be a conical structure with the cone apex at the top. As another example, the premixing hood 28 can also be a prismatic structure with the smaller top surface at the top. The shape of the fairing 33 is adapted to the shape of the premixing fairing 28. For example, when the premixing fairing 28 is a frustum-shaped structure, the fairing 33 can be a conical structure.

[0073] For example, when the premixing hood 28 has a frustum-shaped structure, the rectifier hood 33 can have a prism-shaped structure. In use, the air-water mixture in the first premixing zone 29 enters the second premixing zone 35 through the release port of the premixing hood 28. The air-water mixture in the second premixing zone 35 flows out through the branch port 36 and splits into a first branch and a second branch. The air-water mixture in the first branch moves towards the first return port 30, thus forming a circulation. The air-water mixture in the second branch flows downstream over the rectifier hood 33. Furthermore, because the sidewall of the rectifier hood 33 is inclined, it forms a slope. A portion of the air-water mixture slides down the slope (due to the velocity difference created by the acceleration of the edge fluid), mixing with the rapidly rising air-water mixture in the second branch, thereby improving the mixing effect. With this configuration, the aeration zone 26 has recirculation, mixing, and pressurized dissolved gas, increasing the dissolved oxygen concentration. Under the same aeration conditions, efficiency is improved, resulting in greater energy savings.

[0074] like Figure 11 As shown, in one embodiment, the fairing 33 may also be disposed over the end of the speed-maintaining member 27 away from the premixing cover 28.

[0075] like Figure 13As shown, the edge of the shroud 33 can be provided with several toothed orifices 37, which are distributed circumferentially along the shroud 33. This arrangement has two advantages: first, the toothed orifices 37 enhance the mixing effect because the flow velocities in the concave and convex areas of the 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 air-water mixture further enhances the mixing effect, and the downward flow of the mixture increases the mixing distance, extending the effective contact time and preventing it from rising directly to the liquid surface. This arrangement increases the mixing distance, prolongs the reaction time, and improves the dissolved oxygen concentration; under the same aeration conditions, it increases efficiency and is more energy-efficient.

[0076] like Figure 12 As shown, the aeration device 15 also includes a baffle 34, which is disposed inside the shroud 33, with the baffle 34 facing the outlet of the retaining element 27. During use, the gas-water mixture released from the outlet at the top of the retaining element 27 impacts the baffle 34 and then diffuses outwards. This arrangement prevents air from accumulating at the top of the shroud 33, thus preventing bubble aggregation and ensuring smooth gas release into the water, thereby improving the gas-water mixing effect.

[0077] The sludge filter bed formed in sedimentation zone 7 has a nitrification filter bed at the bottom and a denitrification filter bed at the top. While filtering the water, the sludge filter bed removes ammonia nitrogen from the water using the nitrification filter bed and removes total nitrogen and COD (Chemical Oxygen Demand) from the water using the denitrification filter bed.

[0078] In one embodiment, the body 1 has a rectangular cross-sectional shape parallel to the horizontal plane, and the anoxic mixing zone 23, the anoxic zone 4, the aerobic zone 5, and the sedimentation zone 7 are concentrically arranged from the inner circle to the outer circle.

[0079] like Figure 14 As shown, in another embodiment, the body 1 has a rectangular cross-sectional shape parallel to the horizontal plane; the anoxic mixing zone 23 and the anoxic anaerobic zone 4 are located in the left half of the region, and the anoxic mixing zone 23 is located in the middle, with the anoxic mixing zone 23 having the anoxic anaerobic zone 4 on its upper and lower sides respectively; the aerobic zone 5 and the sedimentation zone 7 are located in the right half of the region, and the aerobic zone 5 is located in the middle, with the sedimentation zone 7 on its upper and lower sides respectively.

[0080] like Figure 15 As shown, in another embodiment, the body 1 has a rectangular cross-sectional shape parallel to the horizontal plane; the anoxic mixing zone 23 is located in the middle, and the upper and lower sides of the anoxic mixing zone 23 are respectively the anoxic anaerobic zones 4; the left and right sides of the anoxic mixing zone 23 are respectively the aerobic zones 5, and the upper and lower sides of the aerobic zones 5 are respectively the sedimentation zones 7.

[0081] like Figure 16 As shown, in another embodiment, the body 1 has a rectangular cross-sectional shape parallel to the horizontal plane; the anoxic mixing zone 23 is located in the middle, and the upper and lower sides of the anoxic mixing zone 23 are respectively anoxic zones 4; the left and right sides of the anoxic mixing zone 23 are respectively sedimentation zones 7, and the upper and lower sides of the sedimentation zones 7 are respectively aerobic zones 5.

[0082] like Figure 17 As shown, in one embodiment, a water distribution device 38 is provided at the bottom of the aerobic zone 5. This water distribution device 38 has multiple layers of water distribution channels 39 in the height direction, and adjacent layers of water distribution channels 39 are connected. The uppermost water distribution channel 39 is provided with a water distribution channel inlet 40, and the bottommost water distribution channel 39 has several water distribution holes 41 on its channel wall. During water distribution, water from the upstream anaerobic zone 4 enters the uppermost water distribution channel 39 through the water distribution channel inlet 40. After flowing to the end of this layer of water distribution channel 39, the water enters the next layer of water distribution channel 39, and so on, until the water enters the bottommost water distribution channel 39. The water is then evenly released through the water distribution holes 41. This setup ensures that the water is evenly distributed at the bottom of the aerobic zone 5. Especially in scenarios where the aerobic zone 5 has a large area, this water distribution method can achieve uniform water distribution throughout the entire area, ensuring that the entire aerobic zone 5 is fully utilized and improving the treatment effect.

[0083] The water distribution device 38 can be used in combination with the aeration device 15, with the water distribution device 38 below and the aeration device 15 above. This achieves uniform water distribution in the aerobic zone 5 while also improving the aeration effect and enhancing the aerobic reaction.

[0084] The water distribution device 38 is not limited to use in the aerobic zone 5 when distributing water. It can also be used in other functional zones that require uniform water distribution, such as the anoxic mixing zone, the anoxic anaerobic zone 4, and the sedimentation zone 7.

[0085] like Figure 18As shown, in one embodiment, a sludge return chamber 42 is also provided within the sedimentation zone 7. The sludge return chamber 42 is located on one side of the sedimentation zone 7, and the sludge collection hopper 8 is located on the other side of the sedimentation zone 7. The area between the two is the area where the sludge filter bed is located. A slanted tube separator 10 is further provided in the middle of the sedimentation zone 7. Unlike the slanted tube separator 10 near the top, the tube bundles inside this slanted tube separator are all inclined towards the sludge return chamber 42, while the slanted tubes of the top slanted tube separator 10 are all vertically arranged. This arrangement provides a guiding function for the lower slanted tube separator 10, guiding the sludge towards the sludge return chamber 42. A balancing plate 43 can be provided above the sludge return chamber 42. The balancing plate 43 is vertically arranged, with its bottom lower than the upper edge of the sludge return chamber 42 and its top flush with the edge of the sludge collection hopper 8. This configuration ensures that the sludge filter bed is flush with the edge of the sludge collection hopper 8 at the far end, guaranteeing a consistent height of the sludge filter bed across the entire surface. Furthermore, it does not affect the return flow of the heavier sludge at the bottom.

[0086] like Figure 19 As shown, in one embodiment, a portion of the tube bundle in the lower inclined tube separator 10 can be inclined towards the sludge return chamber 42, while another portion can be inclined towards the sludge collection hopper 8. Furthermore, the bottom of the sludge collection hopper 8 can be connected to the sludge return pipe 19 via a pipeline. With this configuration, smaller sludge particles in the sludge filter bed enter the sludge return chamber 42 from the left side for return, while the right side serves as the space for the inclined tube separator 10 to separate better sludge.

[0087] like Figure 20 As shown, in one embodiment, the inclined tube separation device 10 is connected to the sludge return pipe 19 via a pipeline at a midpoint where the two tube bundles have different inclination directions. This arrangement allows a portion of the sludge in the area where the sludge filter bed is located to also return to the upstream first mixing zone 2.

[0088] like Figure 21 As shown, in one embodiment, the inclined tube separation device 10 has a sludge discharge hopper 44 located at the midpoint between the two tube bundles with different inclination directions. The bottom of the sludge discharge hopper 44 is connected to a pipeline extending to the outside of the main body 1 or connected to the sludge discharge pipe 14. This arrangement ensures that the sludge in the middle position can be discharged normally even when the water volume is large or the area of ​​the entire structure is too large. The sludge return pipe 19 can also be connected to the sludge discharge hopper 44 via a pipeline, allowing the sludge in the sludge discharge hopper to flow back upstream to the first mixing zone 2.

[0089] like Figure 22As shown, in one embodiment, the targeted self-circulating sludge granulation treatment device further includes a lifting agitator 45. The base of the lifting agitator 45 can be installed on the top of the main body 1, and the connecting rod and the spiral fan blades of the lifting agitator 45 extend into the throat 17. In use, the lifting agitator 45 can promote the rise of water in the throat 17. For example, the lifting agitator 45 can be frequency-controlled so that the speed of the spiral fan blades can be adjusted, and the flow rate of the rising water can also be adjusted, thus the amount of water returning will also change with the speed. The lifting agitator 45 can be used alone or in conjunction with jetting and airlift.

[0090] like Figure 23 As shown, in one embodiment, the bottom of the first mixing zone 2 uses pressurized water intake, which is accelerated by jets after intake. Multiple acceleration devices are used in the rising section for diversion. In addition to the jet acceleration, an upper-level agitator 45 provides upward flow assistance. The rotation speed of the spiral fan blades can change the diversion force and flow rate. The throat 17 has two or more layers of diversion, which can recirculate and mix the water that needs to be returned from the anoxic zone, aerobic zone, and sedimentation zone.

[0091] like Figure 24 As shown, in one embodiment, gravity-fed water intake is used at the bottom of the first mixing zone 2. Due to the increased upward flow velocity of the lifting agitator 45, the required backflow during the ascent can be accelerated by a variable diameter flow. All upward flow velocities are channeled through spiral fan blades, and the number of spiral fan blade layers can be calculated to be two or more layers. The rotation speed of the spiral fan blades can change the force and flow rate of the backflow. The throat 17 has two or more layers of backflow, which can backflow and mix the water that needs to be backflowed from the anoxic zone, aerobic zone, and sedimentation zone.

[0092] like Figure 25 As shown, in one embodiment, the bottom of the first mixing zone 2 uses gravity-fed water intake. The water first enters an annular water distribution chamber with annular gaps at the bottom for uniform water distribution. After distribution, the water enters the central rising zone and is lifted upwards by the lifting agitator 45. The speed of the spiral fan blades can change the force and flow rate of the flow. During the lifting process, points requiring recirculation are accelerated by narrowing the diameter and then connected to a return pipe. The throat 17, which requires the flow to two or more layers, is narrowed to allow for the recirculation and mixing of the anoxic zone, aerobic zone, and sedimentation zone.

[0093] like Figure 26 As shown, in one embodiment, the bottom of the first mixing zone 2 uses gravity-fed water intake. The water first enters an annular water distribution chamber with annular gaps at the bottom for uniform water distribution. After distribution, the water enters the central rising zone, where it is lifted upwards by the lifting agitator 45. The rotation speed of the spiral fan blades can change the force and flow rate of the flow. Points requiring return flow during the lifting process are accelerated by narrowing the diameter and then connected to a return pipe. The impeller is mainly arranged in the upper region.

[0094] like Figure 27 As shown, in one embodiment, the bottom of the first mixing zone 2 is gravity-fed, and the spiral fan blades are of unequal diameter.

[0095] like Figure 28 As shown, in one embodiment, the bottom of the first mixing zone 2 is gravity-fed. After rebounding from the bottom plate, the water rises due to the lifting action of the lifting agitator 45. After water distribution, it enters the central rising zone, where it is further lifted upwards by the lifting agitator 45. The rotation speed of the spiral fan blades can change the force and flow rate of the flow. Then, a return pipe is connected. The spiral fan blades are arranged in an independent hopper, and the return pipe is connected inside the hopper, so that the water that needs to be returned from the anoxic zone, aerobic zone, sedimentation zone, etc., returns to the central mixing zone.

[0096] 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 targeted self-circulating sludge granulation treatment device, characterized by, The device comprises: a body (1) in which an anoxic mixing zone (23), an anaerobic zone (4), an aerobic zone (5) and a sedimentation zone (7) are sequentially arranged along the direction of the hydraulic path; a first partition (9) arranged in the sedimentation zone (7), which divides the space in the sedimentation zone (7) into several independent chambers, and a sludge filter bed is formed in each chamber when water flows through the sedimentation zone (7); a sludge collecting hopper (8) arranged in each chamber, and the upper edge of the sludge filter bed is slightly higher than the hopper edge of the sludge collecting hopper (8); a sludge discharge pipe (14) connected to one end of the sludge collecting hopper (8) and extending to the outside of the body (1); an aeration device (15) arranged in the aerobic zone (5); the aeration device (15) comprises an aerator (31) and an acceleration member; the aerator (31) is arranged at the bottom of the aerobic zone (5), and the aerator (31) is used to provide the gas required for aerobic reaction; the acceleration member comprises a premixing cover (28) and a speed maintaining member (27); the premixing cover (28) is arranged at the gas outlet end of the aerator (31), and the space between the premixing cover (28) and the aerator (31) forms a first premixing zone (29); a space is left between the premixing cover (28) and the aerator (31) to form a first backwater inlet (30), which communicates the space inside and outside the first premixing zone (29); wherein the flow area of the release port of the premixing cover (28) is smaller than the flow area of the water inlet of the premixing cover (28), so as to increase the pressure in the first premixing zone (29) in the aeration state; one end of the speed maintaining member (27) is connected to the release port of the premixing cover (28), and the other end extends away from the premixing cover (28).

2. The device according to claim 1, wherein the first partition (9) is located in the upper half of the sedimentation zone (7), the sludge collecting hopper (8) is located in the middle of the chamber, and the hopper edge of the sludge collecting hopper (8) is higher than the bottom of the first partition (9) and does not exceed the top of the first partition (9).

3. The device according to claim 1, wherein it further comprises an inclined pipe separation device (10) arranged in the upper half of the sedimentation zone (7); the bottom of the inclined pipe separation device (10) is connected to the top of the first partition (9).

4. The device according to claim 1, wherein it further comprises a circulating encryption device (20) arranged in the lower half of the sedimentation zone (7); the circulating encryption device (20) comprises an encryption pipe (21) and a first flow guide cone (22); the encryption pipe (21) is arranged vertically, and the inlet end of the encryption pipe (21) has a larger pipe diameter than the outlet end. The first flow guide cone (22) is arranged below the encryption pipe (21), and a space is left between the flow guide surface of the first flow guide cone (22) and the outlet end of the encryption pipe (21). 5.The targeted self-circulation sludge granulation treatment device according to claim 1, characterized in that, The anoxic mixing zone (23) is divided into a first mixing zone (2) and a second mixing zone (3), and the outlet of the first mixing zone (2) is in communication with the inlet of the second mixing zone (3). A water body accelerating device is arranged in the first mixing zone (2), and the water body accelerating device comprises a throat pipe (17) and at least one level of a spray pipe (16), the throat pipe (17) is arranged on the top of the spray pipe (16), the external water body is accelerated by the spray pipe (16) and then enters the throat pipe (17), and the water body is released from the top of the throat pipe (17) into the first mixing zone (2). A sludge backflow hopper (18) is arranged in the second mixing zone (3), the hopper along of the sludge backflow hopper (18) is arranged close to the top of the second mixing zone (3), and the outlet of the sludge backflow hopper (18) is in communication with the throat pipe (17). 6.The targeted self-circulation sludge granulation treatment device according to claim 5, characterized in that, It further comprises a sludge backflow pipe (19) having one end in communication with the sludge collecting hopper (8) and the other end in communication with the throat pipe (17). 7.The targeted self-circulation sludge granulation treatment device according to claim 1, characterized in that, It further comprises a second partition plate (24); The lower half of the aerobic zone (5) is provided with the second partition plate (24), the second partition plate (24) divides the lower half of the aerobic zone (5) into a plurality of aeration zones (26), and the aeration device (15) is arranged in the aeration zone (26); The space between adjacent two aeration zones (26) forms an internal backflow channel (25), the bottom of the second partition plate (24) is provided with a gap in communication with the aeration zone (26) and the internal backflow channel (25), the water body in the internal backflow channel (25) and the water body in the aeration zone (26) flow in opposite directions; The bottom of the internal backflow channel (25) is provided with a second flow guide cone (32) to guide the water body in the internal backflow channel (25) to backflow into the aeration zone (26). 8.The targeted self-circulation sludge granulation treatment device according to claim 1, characterized in that, The lower layer of the sludge filter bed formed in the sedimentation zone (7) is a nitrification filter layer, and the upper layer is a denitrification filter layer; The sludge filter bed filters the passing water body, removes the ammonia nitrogen in the water body by the nitrification filter layer, and removes the total nitrogen and COD in the water body by the denitrification filter layer. 9.The targeted self-circulation sludge granulation treatment device according to claim 1, characterized in that, The body (1) has a rectangular cross-sectional shape parallel to the horizontal plane, and the anoxic mixing zone (23), the anaerobic zone (4), the aerobic zone (5) and the sedimentation zone (7) are concentrically arranged from the inner circle to the outer circle. 10.The targeted self-circulation sludge granulation treatment device according to claim 1, characterized in that, The body (1) is rectangular in cross section parallel to the horizontal plane; The anoxic mixed zone (23) is located in the left half, and the anoxic mixed zone (23) is located in the middle, and the upper and lower sides of the anoxic mixed zone (23) are respectively the anaerobic zone (4); The aerobic zone (5) and the sedimentation zone (7) are located in the right half, and the aerobic zone (5) is located in the middle, and the upper and lower sides of the aerobic zone (5) are respectively the sedimentation zone (7).

11. The targeted self-circulation sludge granulation treatment device according to claim 1, wherein, The body (1) is rectangular in cross section parallel to the horizontal plane; The anoxic mixed zone (23) is located in the middle, and the upper and lower sides of the anoxic mixed zone (23) are respectively the anaerobic zone (4); The left and right sides of the anoxic mixed zone (23) are respectively the aerobic zone (5), and the upper and lower sides of the aerobic zone (5) are respectively the sedimentation zone (7).

12. The targeted self-circulation sludge granulation treatment device according to claim 1, wherein, The body (1) is rectangular in cross section parallel to the horizontal plane; The anoxic mixed zone (23) is located in the middle, and the upper and lower sides of the anoxic mixed zone (23) are respectively the anaerobic zone (4); The left and right sides of the anoxic mixed zone (23) are respectively the sedimentation zone (7), and the upper and lower sides of the sedimentation zone (7) are respectively the aerobic zone (5).

13. The targeted self-circulation sludge granulation treatment device according to claim 5, wherein, Further comprising a lifting agitator (45) arranged in the first mixing zone (2) for accelerating the upward movement of water in the throat pipe (17).

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