Aerobic tank of sewage treatment device and precipitation separation mechanism thereof

Abstract

The invention relates to the technical field of sewage treatment, and discloses an aerobic tank of a sewage treatment device and a precipitation separation mechanism thereof, and the separation mechanism comprises a shell, a central pipe, a first separation group and a second separation group; the central pipe is vertically arranged in the shell, muddy water inlets which are distributed in the height direction of the central pipe at intervals are formed in the peripheral surface of the bottom of the central pipe, a muddy water outlet is formed in the peripheral surface, close to the top, of the central pipe, and an air outlet is formed in the top of the central pipe; the device is good in separation effect, does not need an additional sedimentation tank, reduces land occupation, improves the land utilization rate of a factory, is short in construction period, is convenient to construct, reduces the manpower and energy consumption cost, and reduces the economic pressure of a sewage plant, and the assembly can be completed by directly arranging the sedimentation separation device in the aerobic tank.

Description

Technical Field

[0001] The 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] At present, with the expansion of urban scale and the intensification of urbanization construction, the treatment scale of urban sewage treatment plants has also been growing, and more and more sewage treatment plants are operating in an overloaded state. Due to many reasons such as land planning and land acquisition difficulties, it is difficult to increase the capacity and expand traditional sewage treatment plants. Therefore, when building additional aerobic tanks and sedimentation tanks, the process of additional sedimentation tanks is complicated, and the construction period of sewage treatment equipment is long. It takes a long time from design, construction to commissioning and operation. In this process, sewage treatment plants may face the risk of overload operation; adding additional sedimentation tanks also requires a lot of money for construction and maintenance, and the energy consumption and labor costs during operation are also relatively high, which brings great economic pressure to 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 have good separation effect, do not need to set up additional sedimentation tanks, reduce land occupation, and improve 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, and also reduce 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 is vertically arranged in the shell, the outer peripheral surface of the bottom of the central tube is provided with muddy water inlets spaced apart in the height direction of the central tube, the outer peripheral surface of the central tube near the top is provided with a muddy water outlet, and the top of the central tube is provided with an air outlet;

[0007] A first separation group, the first separation group is arranged at the bottom of the separation chamber, the first separation group comprises a plurality of first separation plates arranged around the central tube, the first separation plates are folded downward, there are gaps between adjacent first separation plates, a first water-gas cavity is formed inside the first separation plates, and the first water-gas cavity is 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, the second separation group includes a plurality of second separation plates arranged around the central tube, the second separation plates are folded downward, there are gaps between adjacent second separation plates, a second water-gas cavity is formed inside the second separation plates, 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, a sedimentation separation mechanism in an 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 an 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, 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 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, the gas and liquid form a second water-gas cavity that is approximately triangular in shape 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 gas enters the gap 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 gas-cement mixture again to prevent the gas-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, and the gas-water mixture in the second water-gas cavity enters the central tube through the gas-water inlet in the horizontal direction; the gas-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 gas outlet, and 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 solid impurities in the separation chamber is greater than that of liquid, so it will move downward and return to the bottom of the aerobic tank through the gap between the first separation plates and the second separation plates for deposition, thereby realizing gas-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 body is connected to the third plate body, the third plate body is arranged parallel to the first plate body, and the third plate body and the first plate body 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 body is connected to the fourth plate body, and the fourth plate body 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 drain pipe extends to the outside of the shell to drain water.

[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 arranged on the circumferential outer side of the mud and water outlet of the central pipe, and the mud guard is arranged around the central pipe.

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

[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 aerobic tank of a sewage treatment device according to an 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 inner 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, 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 in the aerobic tank, the gas-cement mixture can be separated in the aerobic tank, and the separation effect is good, there is no need to set up an additional sedimentation tank, land occupation is reduced, and the land utilization rate of the factory is improved, and the sedimentation separation device can be directly arranged in the aerobic tank to complete the assembly, the construction period is short, the construction is convenient, and the manpower and energy consumption costs are reduced, and the economic pressure of the sewage treatment plant is reduced.

[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 given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of an aerobic tank and a sedimentation separation mechanism according to an embodiment of the present invention;

[0022] In the figure, 1, shell; 11, separation chamber; 2, center 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 pool. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which 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 only used to explain the present invention, and cannot be understood 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., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present invention.

[0025] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. 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: a shell 1, the shell 1 is set to be cylindrical, a separation chamber 11 is formed in the shell 1, and the separation chamber 11 is used to separate liquid and solid impurities; a central tube 2 is also arranged in the shell 1, and the central tube 2 is arranged to penetrate the shell 1 in the vertical direction; muddy water inlets 21 are arranged on the outer peripheral surface of the bottom of the central tube 2 and are distributed at intervals in the height direction of the central tube 2, and the muddy water inlets 21 are arranged in at least two groups, and the muddy water inlets 21 of different groups are distributed at intervals 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 opened on the outer peripheral surface close to the top of the central tube 2, and the muddy water outlet 22 is evenly distributed around the outer peripheral 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 opened on the top of the central tube 2, and the air outlet 23 is opened vertically upward to facilitate gas overflow from the 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 which are arranged at intervals 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 a plurality of 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, and 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 shell 1 through the gas outlet 23, and 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 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 in the aerobic tank, and the gas-water mixture can be separated in the aerobic tank, and the separation effect is good, and 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, and it also reduces the manpower 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 body 411 and a second plate body 412 extending in different directions, the length of the first plate body 411 is greater than the length of the second plate body 412, and the first plate body 411 and the second plate body 412 of the second separation plate 41 adjacent thereto are arranged, which can agitate the water flow flowing between the first plate body 411 and the second plate body 412 adjacent thereto, so that the water flow forms a rotation here, and the rotating water flow can scrape away the sludge in the gap between the first plate body 411 and the second plate body 412, preventing solid impurities such as sludge from being blocked here, thereby improving the smoothness of the passage between the first plate body 411 and the second plate body 412. Furthermore, the length of the first plate body 411 is at least 1.5 times the length of the second plate body 412, which can ensure the generation of a rotating water flow between the first plate body 411 and the second plate body 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 extending 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, which accelerates the mud and water in the process of flowing downward, and makes the water flowing out of the mud and water channel have 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 water flow direction, 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 washing effect of the vortex at the end of the mud and water channel, and ensure the smoothness 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 provided in the circumference of the top of the central tube 2. The water outlet pipe 5 has a water collecting function. It is provided at the top of the separation zone and can discharge the clean water without solid impurities from the separation zone. The water outlet pipe 5 is provided with a water inlet 51 facing the separation chamber 11. The water inlet 51 is provided downward to facilitate the water flow in the separation zone below it to enter the water outlet pipe 5. One end of the drain pipe extends to the outside of the housing 1 for drainage. Furthermore, a filter screen can 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 the water outlet efficiency is also improved. Most of the water in the separation zone can be discharged in time, and excessive separated water is 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 the 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 each first separation plate 31 or second separation plate 41 has a corresponding muddy water inlet 21, and each muddy water inlet 21 is provided as a triangular hole corresponding to the first separation plate 31. Furthermore, pipelines may be provided at the first water-gas cavity 32 and the second water-gas cavity 42 to transfer liquid so that the liquid reaches 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 one of the above embodiments is arranged. The sedimentation separation mechanism is arranged at the upper position in the aerobic tank 7, and the sedimentation separation mechanism includes an outer shell 1 and an inner central tube 2, and a first separation group 3 and a second separation group 4 are arranged around the bottom of the central tube 2, and 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, and 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 in the aerobic tank 7, and the gas-cement mixture can be separated in the aerobic tank 7, and the separation effect is good, and 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 arranged in the aerobic tank 7 to complete the assembly, which has a short construction period and is convenient for construction, and also reduces the manpower 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 which can discharge sludge regularly, so as to discharge the sludge 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, the sedimentation separation mechanism comprises an outer shell 1 and an inner 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 comprise a plurality of 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 muddy 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 to work, the gas-cement mixture at the bottom that has been aerated 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 in shape at the top of the second separation plate 41, and the gas-water mixture in the second water-gas cavity 42 is 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 and convenient construction. It also reduces labor and energy consumption costs, thereby reducing the economic pressure of the sewage treatment plant.

[0042] The above are only preferred embodiments 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 is vertically arranged in the shell, the outer peripheral surface of the bottom of the central tube is provided with muddy water inlets spaced apart in the height direction of the central tube, the outer peripheral surface of the central tube near the top is provided with a muddy water outlet, and the top of the central tube is provided with an air outlet; A first separation group, the first separation group is arranged at the bottom of the separation chamber, the first separation group comprises a plurality of first separation plates arranged around the central tube, the first separation plates are folded downward, there are gaps between adjacent first separation plates, a first water-gas cavity is formed inside the first separation plates, and the first water-gas cavity is 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, the second separation group includes a plurality of second separation plates arranged around the central tube, the second separation plates are folded downward, there are gaps between adjacent second separation plates, a second water-gas cavity is formed inside the second separation plates, and the second water-gas cavity is flush with the height of at least one group of the mud and water inlets.

2. The sedimentation separation mechanism according to claim 1, characterized in that: 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.

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

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

5. The sedimentation separation mechanism according to claim 1, characterized in that: A water outlet pipe is arranged in the circumference of the top of the central tube, and a water inlet facing the separation chamber is opened on the water outlet pipe. One end of the drain pipe extends to the outside of the shell to drain water.

6. The sedimentation separation mechanism according to claim 5, characterized in that: A plurality of water outlet pipes are provided, and the plurality of water outlet pipes are arranged around the central pipe.

7. The sedimentation separation mechanism according to claim 1, characterized in that: A mud guard is arranged on the circumferential outer side of the muddy water outlet of the central pipe, and the mud guard is arranged around the central pipe.

8. The sedimentation separation mechanism according to claim 1, characterized in that: There are multiple muddy water inlets, and each muddy water inlet is configured as a triangular hole corresponding to the first separation plate.

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

10. The aerobic tank of the sewage treatment device according to claim 9, 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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