Aerobic tank and sedimentation separation mechanism of sewage treatment device

Abstract

The present invention relates to the technical field of sewage treatment, and discloses an aerobic tank of a sewage treatment device and a sedimentation and separation mechanism thereof, wherein the separation mechanism comprises: an outer shell, a central pipe, a first separation group and a second separation group; the central pipe is vertically arranged in the outer shell, muddy water inlets spaced apart in the height direction of the central pipe are provided on the outer peripheral surface of the bottom of the central pipe, muddy water outlets are provided on the outer peripheral surface close to the top of the central pipe, and an air outlet is provided on the top of the central pipe; the separation effect of the present application is good, no additional sedimentation tank is required, land occupation is reduced, and land utilization rate of the factory is improved; the sedimentation and separation device can be directly arranged in the aerobic tank to complete assembly, the construction period is short, construction is convenient, and labor and energy consumption costs are reduced, thereby reducing the economic pressure of the sewage treatment plant.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to an aerobic tank of a sewage treatment device and a sedimentation and separation mechanism thereof. Background Art

[0002] With the expansion of cities and the intensification of urbanization, the treatment capacity of urban sewage treatment plants is also growing, and more and more sewage treatment plants are operating at overload. Due to difficulties in land planning and acquisition, the expansion of traditional sewage treatment plants is difficult. Therefore, the construction of additional aerobic tanks and sedimentation tanks is complex and the construction cycle of sewage treatment equipment is long. From design and construction to commissioning and operation, it takes a long time. During this process, sewage treatment plants may face the risk of operating at overload. The construction and maintenance of additional sedimentation tanks also require a large investment, and the energy consumption and labor costs during operation are relatively high, which puts a great deal of financial pressure on sewage treatment plants. Summary of the Invention

[0003] The purpose of the present invention is to provide an aerobic tank and a sedimentation separation mechanism of a sewage treatment device, which has a good separation effect, does not require the installation of an additional sedimentation tank, reduces land occupation, and improves the land utilization rate of the factory. The sedimentation separation device can be directly installed in the aerobic tank to complete the assembly, which has a short construction period and convenient construction, and also reduces labor and energy consumption costs, thereby reducing the economic pressure of the sewage treatment plant.

[0004] In order to achieve the above object, the present invention provides a sedimentation separation mechanism, comprising:

[0005] a housing, wherein a separation cavity is formed in the housing;

[0006] A central tube, the central tube being vertically disposed in the outer shell, the central tube having muddy water inlets spaced apart in the height direction thereof on the outer circumferential surface of the bottom, a muddy water outlet on the outer circumferential surface near the top, and an air outlet on the top of the central tube;

[0007] a first separation group, the first separation group being arranged at the bottom of the separation chamber, the first separation group comprising a plurality of first separation plates arranged around the central tube, the first separation plates being folded downward, with gaps being provided between adjacent first separation plates, a first water-gas cavity being formed inside the first separation plates, the first water-gas cavity being flush with the height of at least one group of the muddy water inlets;

[0008] The second separation group is arranged below the first separation group, and the second separation group includes a plurality of second separation plates arranged around the central tube, the second separation plates are folded downward, and there are gaps between adjacent second separation plates, and a second water-gas cavity is formed inside the second separation plate, and the second water-gas cavity is flush with the height of at least one group of the mud and water inlets.

[0009] Compared with the prior art, the sedimentation separation mechanism of the embodiment of the present invention has the following beneficial effects: the sedimentation separation mechanism of the present application is arranged at an upper position in the aerobic tank, the sedimentation separation mechanism includes an outer shell and an internal central pipe, and a first separation group and a second separation group are arranged around the bottom of the central pipe, the first separation group and the second separation group include multiple groups of first separation plates and second separation plates formed by folding, and the tops of the first separation plates and the second separation plates are both aligned with the mud and water inlet of the central pipe; when the sedimentation separation mechanism is working, the air-cement mixture that has been aerated at the bottom rises to the second separation group, is blocked by the second separation group, and separates after entering the second separation plate, and the gas and liquid form a second water-gas cavity that is approximately triangular on the top of the second separation plate, and the air-water mixture in the second water-gas cavity enters the central pipe, and part of the air-cement mixture passes through the space between the second separation plates The gap enters and reaches the first separation group, and the mud-water mixture falling from the upper separation area will also enter the first separation group along the gap. At this time, the first separation plate of the first separation group blocks the air-cement mixture again to prevent the air-cement mixture from entering the separation chamber. The gas and liquid form a first water-gas cavity that is approximately triangular on the top of the first separation plate. The air-water mixture in the second water-gas cavity enters the central tube through the air-water inlet in the horizontal direction; the air-water mixture entering the central tube reaches the top of the sedimentation separation mechanism under the push of water pressure, and the gas is discharged from the shell through the air outlet. The gas with a small amount of solid impurities is discharged from the central tube through the horizontal mud-water outlet into the separation chamber. The mass of the solid impurities in the separation chamber is greater than that of the liquid, so it will move downward and return to the bottom of the aerobic tank through the gap between the first separation plate and the second separation plate for deposition, thereby realizing air-water separation. The sedimentation separation mechanism of the present application is integrated in the aerobic tank, and the gas-cement mixture can be separated in the aerobic tank with good separation effect. There is no need to set up an additional sedimentation tank, which reduces land occupation and improves the land utilization rate of the factory. The sedimentation separation device can be directly set in the aerobic tank to complete the assembly, which has a short construction period and convenient construction, and also reduces labor and energy consumption costs, thereby reducing the economic pressure of the sewage treatment plant.

[0010] In the sedimentation separation mechanism of the embodiment of the present invention, the second separation plate includes a first plate body and a second plate body extending in different directions, and the length of the first plate body is greater than the length of the second plate body.

[0011] In the sedimentation separation mechanism of the embodiment of the present invention, the end of the second plate is connected to a third plate, the third plate is arranged parallel to the first plate, and the third plate and the first plate adjacent to the second separation plate form a muddy water channel.

[0012] In the sedimentation separation mechanism of the embodiment of the present invention, the end of the first plate is connected to a fourth plate, and the fourth plate is arranged horizontally.

[0013] In the sedimentation separation mechanism of the embodiment of the present invention, a water outlet pipe is circumferentially arranged on the top of the central tube, a water inlet toward the separation chamber is opened on the water outlet pipe, and one end of the water outlet pipe extends to the outside of the shell for drainage.

[0014] In the sedimentation separation mechanism of the embodiment of the present invention, a plurality of water outlet pipes are provided, and the plurality of water outlet pipes are arranged around the central pipe.

[0015] In the sedimentation and separation mechanism of the embodiment of the present invention, a mud guard is provided on the circumferential outer side of the muddy water outlet of the central pipe, and the mud guard is provided around the central pipe.

[0016] In the sedimentation and separation mechanism of the embodiment of the present invention, a plurality of muddy and water inlets are provided, and each muddy and water inlet is configured as a triangular hole.

[0017] The present invention further provides an aerobic tank of a sewage treatment device, wherein the aerobic tank is provided with the sedimentation separation mechanism described in any one of the above embodiments.

[0018] An embodiment of the present invention provides an aerobic tank for a sewage treatment device, and its beneficial effects are as follows: the sedimentation separation mechanism of the present application is arranged at an upper position in the aerobic tank, the sedimentation separation mechanism includes an outer shell and an internal central pipe, a first separation group and a second separation group are arranged around the bottom of the central pipe, the first separation group and the second separation group include a plurality of groups of first separation plates and second separation plates formed by folding, and the tops of the first separation plates and the second separation plates are both aligned with the mud and water inlet of the central pipe. The sedimentation separation mechanism of the present application is integrated into the aerobic tank, and the air-cement mixture can be separated in the aerobic tank with good separation effect, without the need to set up an additional sedimentation tank, reducing land occupation and improving the land utilization rate of the factory, and the sedimentation separation device can be directly set in the aerobic tank to complete the assembly, with a short construction period and convenient construction, and also reducing labor and energy consumption costs, thereby reducing the economic pressure of the sewage treatment plant.

[0019] In the aerobic tank of the sewage treatment device according to the embodiment of the present invention, the bottom of the second separation group is an aeration zone, and the aeration zone is connected to a sewage inlet pipe and an aeration pipe.

[0020] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the aerobic tank and the sedimentation separation mechanism according to an embodiment of the present invention;

[0022] In the figure, 1. outer shell; 11. separation chamber; 2. central tube; 21. mud and water inlet; 22. mud and water outlet; 23. air outlet; 3. first separation group; 31. first separation plate; 32. first water-gas cavity; 4. second separation group; 41. second separation plate; 411. first plate body; 412. second plate body; 413. third plate body; 414. fourth plate body; 42. second water-gas cavity; 5. water outlet pipe; 51. water inlet; 6. mud guard; 7. aerobic tank. DETAILED DESCRIPTION

[0023] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0025] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] like Figure 1As shown, a sedimentation separation mechanism of a preferred embodiment of the present invention comprises: an outer shell 1, which is arranged in a cylindrical shape, and a separation chamber 11 is formed in the outer shell 1, and the separation chamber 11 is used to separate liquid and solid impurities; a central tube 2 is further provided in the outer shell 1, and the central tube 2 is arranged to penetrate the outer shell 1 in the vertical direction; muddy water inlets 21 are provided on the outer circumferential surface of the bottom of the central tube 2, which are spaced apart in the height direction of the central tube 2, and the muddy water inlets 21 are provided with at least two groups, and the muddy water inlets 21 of different groups are spaced apart along the height direction of the central tube 2, and each group of muddy water inlets 21 is evenly distributed around the central tube 2 in the circumferential direction; a muddy water outlet 22 is provided on the outer circumferential surface near the top of the central tube 2, and the muddy water outlets 22 are evenly distributed around the outer circumferential surface of the central tube 2 to ensure that the water outlet of the central tube 2 in all horizontal directions remains uniform, and an air outlet 23 is provided on the top of the central tube 2, and the air outlet 23 is opened vertically upward to facilitate the gas to overflow the outer shell 1;

[0028] A sedimentation separation mechanism according to a preferred embodiment of the present invention further includes a first separation group 3 and a second separation group 4 spaced apart in the vertical direction. The first separation group 3 is arranged at the bottom of the separation chamber 11. The first separation group 3 includes a plurality of first separation plates 31 arranged around the central tube 2, and different first separation plates 31 are arranged parallel to each other. Each first separation plate 31 is folded downward and has an upward strip-shaped spire. There is a gap between adjacent first separation plates 31. The strip-shaped spire and the gap allow solid impurities in the separation chamber 11 to smoothly return to the aeration zone in the aerobic tank. A first water-gas cavity 32 is formed inside the first separation plate 31. The first water-gas cavity 32 is flush with the height of at least one group of mud-water inlets 21, so that the air-water-cement mixture that rises to the first separation zone through the second separation group 4 and the mud-water mixture that falls from the upper separation zone can enter the first separation group 3 along the gap, undergo preliminary separation at the first separation plate 31, and allow the separated air-water mixture to enter the central tube 2.

[0029] The second separation group 4 is arranged below the first separation group 3. The second separation group 4 includes multiple second separation plates 41 arranged around the central tube 2. Different second separation plates 41 are arranged parallel to each other; the second separation plates 41 are folded downward and have upward strip-shaped spires. There are gaps between adjacent second separation plates 41. The strip-shaped spires and the gaps allow solid impurities falling from the first separation zone to smoothly return to the aeration zone in the aerobic tank; a second water-gas cavity 42 is formed inside the second separation plate 41. The second water-gas cavity 42 is flush with the height of at least one group of mud and water inlets 21, so that the gas-water mixture rising from the aerobic zone to the second separation zone is initially separated at the second separation plate 41, and the separated gas-water mixture enters the central tube 2.

[0030] When the sedimentation separation mechanism is working, the air-cement mixture that has been aerated at the bottom rises to the second separation group 4, is blocked by the second separation group 4, and separates after entering the second separation plate 41. The gas and liquid form a second water-gas cavity 42 that is approximately triangular at the top of the second separation plate 41, and the air-water mixture in the second water-gas cavity 42 enters the central tube 2. Part of the air-cement mixture enters the first separation group 3 through the gaps between the second separation plates 41, and the mud-water mixture falling from the upper separation area will also enter the first separation group 3 along the gaps. At this time, the first separation plate 31 of the first separation group 3 blocks the air-cement mixture again to prevent the air-cement mixture from rising. Entering the separation chamber 11, the gas and liquid form a first water-gas cavity 32 that is approximately triangular at the top of the first separation plate 31. The gas-water mixture in the second water-gas cavity 42 enters the central tube 2 in the horizontal direction through the gas-water inlet; the gas-water mixture entering the central tube 2 reaches the top of the sedimentation separation mechanism under the push of water pressure, and the gas is discharged from the shell 1 through the gas outlet 23. The gas with a small amount of solid impurities is discharged from the central tube 2 through the horizontal mud-water outlet 22 into the separation chamber 11. The solid impurities in the separation chamber 11 are larger than the liquid, so they will move downward and return to the bottom of the aerobic tank through the gap between the first separation plate 31 and the second separation plate 41 to be deposited, thereby achieving gas-water separation. The sedimentation separation mechanism of the present application is integrated into the aerobic tank, and the gas-water mixture can be separated in the aerobic tank with good separation effect. There is no need to set up an additional sedimentation tank, which reduces land occupation and improves the land utilization rate of the factory. The sedimentation separation device can be directly set in the aerobic tank to complete the assembly, with a short construction period and convenient construction. It also reduces labor and energy consumption costs and reduces the economic pressure of the sewage treatment plant.

[0031] In some embodiments of the present invention, the second separation plate 41 includes a first plate 411 and a second plate 412 extending in different directions, wherein the length of the first plate 411 is greater than the length of the second plate 412. The different lengths of the first plate 411 and the second plate 412 of the adjacent second separation plate 41 agitate the water flowing between the first plate 411 and the second plate 412, causing the water to swirl there. The swirling water can scrape away sludge in the gap between the first plate 411 and the second plate 412, preventing sludge and other solid impurities from clogging the gap and improving the patency of the passage between the first plate 411 and the second plate 412. Furthermore, the length of the first plate 411 is at least 1.5 times the length of the second plate 412, ensuring a rotating water flow between the first plate 411 and the second plate 412.

[0032] In some embodiments of the present invention, the end of the second plate body 412 is connected to the third plate body 413, and the third plate body 413 is arranged parallel to the first plate body 411. The length of the third plate body 413 extended to the end is also smaller than the first plate body 411. The third plate body 413 and the first plate body 411 of the adjacent second separation plate 41 form a mud and water channel, so that the mud and water accelerate in the process of flowing downward, and the water flowing out of the mud and water channel has a faster impact force, preventing solid sludge from forming blockage in the mud and water channel, thereby improving the overall smoothness of the system.

[0033] In some embodiments of the present invention, the end of the first plate body 411 is connected to the fourth plate body 414, and the fourth plate body 414 is horizontally arranged and extends along the direction of water flow, forming an upward supporting force for the downward water flow, so as to strengthen the vortex formed at the end of the first plate body 411, further strengthen the occurrence of the vortex, strengthen the scrubbing effect of the vortex at the end of the mud and water channel, and ensure the smooth flow of the mud and water channel; the fourth plate body 414 also plays the role of shielding the mud and water channel, which can prevent the air-cement mixture after oxygen exposure at the bottom from directly entering the mud and water channel, causing difficulty in draining the mud and water channel downward.

[0034] In some embodiments of the present invention, a water outlet pipe 5 is circumferentially disposed at the top of the central tube 2. This water outlet pipe 5 serves as a water collection device and is located at the top of the separation zone, discharging clean water free of solid impurities from the separation zone. The water outlet pipe 5 is provided with a water inlet 51 directed toward the separation chamber 11. This inlet 51 faces downward, facilitating the entry of water from the separation zone below it into the water outlet pipe 5. One end of the water outlet pipe extends to the exterior of the housing 1 for drainage. Furthermore, a filter may be provided at the water inlet 51 to prevent residual impurities from entering the water outlet pipe 5.

[0035] In some embodiments of the present invention, multiple water outlet pipes 5 are provided, and the multiple water outlet pipes 5 are arranged around the central pipe 2. The multiple water outlet pipes 5 can cover most areas of the separation zone, and also improve the water outlet efficiency. Most of the water in the separation zone can be discharged in time, and excessive separated water can be prevented from accumulating in the separation zone, causing it to return to the first separation zone and cause secondary pollution.

[0036] In some embodiments of the present invention, a mud guard 6 is provided on the circumferential outer side of the mud and water outlet 22 of the central tube 2. The mud guard 6 blocks the mud and water mixture from which only the gas is separated, forcing it to move downward for a period of time before entering the separation zone, thereby preventing the mud and water mixture from being directly sprayed on the outlet pipe 5, causing sludge impurities to be discharged along with the water flow, thereby ensuring the normal operation of the separation zone; the mud guard 6 is arranged around the central tube 2, thereby increasing the mud blocking range and ensuring that the mud and water mixture sprayed in each direction can be blocked by the mud guard 6.

[0037] In some embodiments of the present invention, multiple muddy water inlets 21 are provided to ensure that each first water-gas cavity 32 and second water-gas cavity 42 of the first separation plate 31 or second separation plate 41 has a corresponding muddy water inlet 21, and each muddy water inlet 21 is configured as a triangular hole. Furthermore, pipes can be provided in the first water-gas cavity 32 and the second water-gas cavity 42 to transfer liquid to the muddy water inlet 21.

[0038] The present invention also provides an aerobic tank 7 of a sewage treatment device, in which the sedimentation separation mechanism of any of the above-mentioned embodiments is provided. The sedimentation separation mechanism is provided at an upper position in the aerobic tank 7, and the sedimentation separation mechanism includes an outer shell 1 and an internal central tube 2. A first separation group 3 and a second separation group 4 are provided around the bottom of the central tube 2. The first separation group 3 and the second separation group 4 include a plurality of groups of folded first separation plates 31 and second separation plates 41. The tops of the first separation plates 31 and the second separation plates 41 are aligned with the mud-water inlet 21 of the central tube 2. The sedimentation separation mechanism of the present application is integrated into the aerobic tank 7, and the gas-cement mixture can be separated in the aerobic tank 7 with good separation effect. There is no need to set up an additional sedimentation tank, which reduces land occupation and improves the land utilization rate of the factory. The sedimentation separation device can be directly set up in the aerobic tank 7 to complete the assembly, which has a short construction period and convenient construction. It also reduces labor and energy consumption costs and reduces the economic pressure of the sewage treatment plant. Furthermore, the bottom of the aerobic tank 7 is provided with an electric sludge discharge mechanism that can discharge sludge regularly, so as to discharge the sludge that has settled at the bottom of the aerobic tank 7 out of the aerobic tank to prevent excessive accumulation of sludge.

[0039] In some embodiments of the present invention, the bottom of the second separation group 4 is an aeration zone, and the aeration zone is connected to a sewage inlet pipe and an aeration pipe. The sewage enters the aerobic zone through the sewage inlet pipe at the bottom of the aerobic zone and mixes with the oxygen in the aeration pipe, and finally reaches the bottom of the sedimentation separation mechanism for separation operation.

[0040] The working process of the present invention is as follows: the sedimentation separation mechanism of the present application is arranged at the upper position in the aerobic tank 7, and the sedimentation separation mechanism includes an outer shell 1 and an internal central tube 2. A first separation group 3 and a second separation group 4 are arranged around the bottom of the central tube 2. The first separation group 3 and the second separation group 4 include multiple groups of first separation plates 31 and second separation plates 41 formed by folding. The tops of the first separation plates 31 and the second separation plates 41 are both aligned with the mud and water inlet 21 of the central tube 2; the sewage enters the aerobic zone through the sewage inlet pipe at the bottom of the aerobic zone, and is mixed with the oxygen in the aeration pipe, and finally reaches the bottom of the sedimentation separation mechanism; when the sedimentation separation mechanism starts working, the gas-cement mixture that has been aerated at the bottom rises to the second separation group 4, is blocked by the second separation group 4, and separates after entering the second separation plate 41. The gas and liquid form a second water-gas cavity 42 that is approximately triangular on the top of the second separation plate 41, and the gas-water mixture in the second water-gas cavity 42 The mixture enters the central tube 2, and part of the gas-cement mixture enters the first separation group 3 through the gap between the second separation plates 41. At this time, the first separation plate 31 of the first separation group 3 blocks the gas-cement mixture again to prevent the gas-cement mixture from entering the separation chamber 11. The gas and liquid form a first water-gas cavity 32 that is approximately triangular at the top of the first separation plate 31. The gas-water mixture in the second water-gas cavity 42 enters the central tube 2 through the gas-water inlet in the horizontal direction; the gas-water mixture entering the central tube 2 reaches the top of the sedimentation separation mechanism under the push of water pressure, and the gas is discharged from the outer shell 1 through the gas outlet 23. The gas with a small amount of solid impurities is discharged from the central tube 2 through the horizontal mud and water outlet 22 into the separation chamber 11. The mass of the solid impurities in the separation chamber 11 is greater than that of the liquid, so it will move downward and return to the bottom of the aerobic tank 7 through the gap between the first separation plates 31 and the second separation plates 41 for deposition, thereby realizing gas-water separation.

[0041] In summary, the embodiment of the present invention provides an aerobic tank 7 of a sewage treatment device and a sedimentation separation mechanism thereof. The sedimentation separation mechanism is integrated in the aerobic tank 7. The gas-cement mixture can be separated in the aerobic tank 7 with good separation effect. There is no need to set up an additional sedimentation tank, which reduces land occupation and improves the land utilization rate of the factory. The sedimentation separation device can be directly set in the aerobic tank 7 to complete the assembly, which has a short construction period, convenient construction, and reduces labor and energy consumption costs, thereby reducing the economic pressure of the sewage treatment plant.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A sedimentation separation mechanism, characterized in that: include: a housing, wherein a separation cavity is formed in the housing; A central tube, the central tube being vertically disposed in the outer shell, the central tube having muddy water inlets spaced apart in the height direction thereof on the outer circumferential surface of the bottom, a muddy water outlet on the outer circumferential surface near the top, and an air outlet on the top of the central tube; a first separation group, the first separation group being arranged at the bottom of the separation chamber, the first separation group comprising a plurality of first separation plates arranged around the central tube, the first separation plates being folded downward, with gaps being provided between adjacent first separation plates, a first water-gas cavity being formed inside the first separation plates, the first water-gas cavity being flush with the height of at least one group of the muddy water inlets; The second separation group is arranged below the first separation group, and the second separation group includes a plurality of second separation plates arranged around the central tube, the second separation plates are folded downward, and there is a gap between adjacent second separation plates, and a second water-gas cavity is formed inside the second separation plate, and the second water-gas cavity is flush with the height of at least one group of the mud and water inlets; the second separation plate includes a first plate body and a second plate body extending in different directions, the length of the first plate body is greater than the length of the second plate body, and the first plate body and the second plate body of the second separation plate adjacent to it are arranged, which will cause the water flow flowing between the first plate body and the second plate body of the second separation plate adjacent to it to be stirred, so that the water flow forms a rotation here.

2. The sedimentation separation mechanism according to claim 1, characterized in that: The end of the second plate is connected to a third plate. The third plate is arranged parallel to the first plate. The third plate and the first plate adjacent to the second separation plate form a muddy and water channel.

3. The sedimentation separation mechanism according to claim 2, characterized in that: The end of the first plate is connected to a fourth plate, and the fourth plate is arranged horizontally.

4. The sedimentation separation mechanism according to claim 1, characterized in that: A water outlet pipe is provided in the circumferential direction of the top of the central tube. A water inlet toward the separation chamber is opened on the water outlet pipe. One end of the water outlet pipe extends to the outside of the shell for water discharge.

5. The sedimentation separation mechanism according to claim 4, characterized in that: There are multiple water outlet pipes, and the multiple water outlet pipes are arranged around the central pipe.

6. The sedimentation separation mechanism according to claim 4, characterized in that: A mud guard is provided on the circumferential outer side of the muddy water outlet of the central pipe, and the mud guard is arranged around the central pipe.

7. The sedimentation separation mechanism according to claim 1, characterized in that: There are multiple muddy water inlets, each of which is configured as a triangular hole.

8. An aerobic tank for a sewage treatment plant, characterized by: The aerobic tank is provided with the sedimentation separation mechanism according to any one of claims 1 to 7.

9. The aerobic tank of the sewage treatment plant according to claim 8, characterized in that: The bottom of the second separation group is an aeration zone, and the aeration zone is connected to a sewage inlet pipe and an aeration pipe.

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