Buried SBR wastewater treatment unit

Abstract

The present application discloses an underground SBR sewage treatment device, comprising a tank body, a reaction tube, a flow tube, a water inlet assembly and an aeration assembly, wherein a first overflow assembly is arranged on the top of the reaction tube for overflowing and flowing out of the water after the reaction; the top of the flow tube is arranged higher than the first overflow assembly; the inner wall of the flow tube and the outer wall of the reaction tube form a flow zone with an outlet downward; the flow tube and the inner wall of the tank body form a sedimentation zone; in a working state, the sewage is transported to the bottom of the reaction tube through the water inlet assembly and aerated through the aeration assembly; the treated sewage flows upward inside the reaction tube, overflows to the flow zone through the first overflow assembly, and flows to the sedimentation zone; the clear water after sedimentation flows upward under the action of subsequent water inlet, and flows out when the liquid level rises to the water outlet; the present application can perform aerobic biological treatment and sufficient sedimentation on the sewage to ensure that the output water quality meets the standard; the invention is aimed at the small amount of rural sewage and intermittent drainage, which can not only fully treat the sewage but also meet the drainage demand.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to an underground SBR sewage treatment device. Background Art

[0002] With the rapid development of my country's economy, people's living standards are constantly improving, and the amount of domestic sewage is increasing. The unreasonable discharge of rural domestic sewage is particularly serious, causing pollution to the environment, which is not conducive to the ecological balance of the rural environment, seriously affecting people's production and life, and hindering sustainable development. Therefore, improving the efficiency of sewage treatment and improving rural sewage treatment are urgent issues.

[0003] Rural domestic sewage mainly comes from washing water, kitchen and toilet sewage and other sewage. Its main pollutants are organic matter, nitrogen, phosphorus and other nutrients, which have good biodegradability. The discharge characteristics of rural domestic sewage are small water volume, more dispersed, and intermittent discharge.

[0004] At present, the sewage treatment technology in rural areas mainly adopts underground integrated equipment such as activated sludge method and contact oxidation method. Due to the small amount of water in rural areas and intermittent discharge, the above processes cannot meet the original designed water treatment volume, resulting in the effluent water quality failing to meet the discharge standards. In addition, the operation is complicated and the maintenance cost is high. Summary of the invention

[0005] In order to solve the problem of poor treatment effect of rural sewage and substandard water quality after treatment, the present application provides an underground SBR sewage treatment device.

[0006] The buried SBR sewage treatment device provided in this application adopts the following technical solution:

[0007] An underground SBR sewage treatment device, comprising:

[0008] The tank body has a side wall provided with a water inlet, an air inlet and a water outlet;

[0009] A reaction cylinder disposed inside the tank body is provided with a first overflow assembly on its top; the first overflow assembly comprises a first overflow weir plate, a first annular plate and a baffle plate, the first annular plate being disposed between the first overflow weir plate and the baffle plate; the baffle plate is provided with a plurality of overflow holes, and the top of the baffle plate is higher than the top of the first overflow weir plate;

[0010] A flow cylinder sleeved on the outside of the reaction cylinder has a top higher than the top of the first overflow weir plate; the baffle is mounted on the inner wall of the flow cylinder through a connecting plate assembly;

[0011] The inner wall of the flow cylinder and the outer wall of the reaction cylinder form a flow zone with an outlet downward;

[0012] The outer wall of the flow tube and the inner wall of the tank body form a sedimentation area;

[0013] A water inlet assembly, used for conveying sewage to be treated to the bottom of the reaction cylinder;

[0014] Aeration components;

[0015] In the working state, sewage is transported to the bottom of the reaction cylinder through the water inlet component and aerated through the aeration component; the treated sewage flows upward inside the reaction cylinder, overflows to the flow zone through the first overflow component, and flows to the sedimentation zone; the clean water after sedimentation flows upward under the action of subsequent water inlet, and flows out when the liquid level rises to the water outlet.

[0016] By adopting the above technical scheme, the sewage can be treated aerobically and fully precipitated to ensure that the output water quality meets the standards; the upflow setting can achieve mutual independence between water intake and water production; this invention is aimed at the small amount of rural sewage and intermittent drainage, which can not only fully treat the sewage, but also meet the drainage needs.

[0017] Preferably, an inspection port is provided on the top of the tank body;

[0018] The height of the tank body is greater than the height of the flow tube;

[0019] The inner bottom of the tank body is provided with a sludge collecting hopper, and the sludge collecting hopper is arranged around the reaction cylinder.

[0020] By adopting the above technical solution, inspection and maintenance are facilitated, and treated water is prevented from flowing out of the inspection port; the setting of the sludge collection bucket facilitates the collection of precipitated sludge at the bottom of the tank, effectively reduces the mud content of the upper liquid surface, and improves water quality.

[0021] Preferably, the reaction cylinder comprises a straight cylinder and a tapered cylinder, and the tapered cylinder is arranged at the bottom of the straight cylinder;

[0022] The bottom of the straight cylinder is arranged lower than the bottom of the reaction cylinder;

[0023] The reaction cylinder and the straight cylinder are connected via a plurality of connection blocks; the plurality of connection blocks are arranged at intervals.

[0024] By adopting the above technical solution, the sewage sedimentation rate is improved, the sludge storage space is increased, and excessive sludge is prevented from being mixed in the water overflowing after the reaction.

[0025] Preferably, the water inlet assembly comprises a first water inlet pipe and a second water inlet pipe, one end of the first water inlet pipe is suspended through the water inlet, and the other end is connected to the second water inlet pipe; the second water inlet pipe is arranged inside the reaction cylinder, and its top is higher than the flow cylinder;

[0026] A plurality of water distribution branches are arranged around the second water inlet pipe, and the plurality of water distribution branches are all connected to the second water inlet pipe;

[0027] A plurality of water distribution branch pipes are arranged inside the conical cylinder;

[0028] A plurality of water distribution holes are provided at the bottom of the water distribution branch pipe.

[0029] By adopting the above technical solution, uniform water distribution inside the tank can be achieved, thereby improving the reaction efficiency of sewage.

[0030] Preferably, the longitudinal axis of the second water inlet pipe is arranged parallel to the longitudinal axis of the straight cylinder;

[0031] The longitudinal axis of the first water inlet pipe is arranged perpendicular to the longitudinal axis of the second water inlet pipe;

[0032] The connection point between the first water inlet pipe and the second water inlet pipe is arranged below the top of the second water inlet pipe.

[0033] By adopting the above technical solution, exhaust is achieved through the second water inlet pipe to prevent sewage from flowing back.

[0034] Preferably, the longitudinal axis of the second water inlet pipe is arranged to coincide with the central axis of the straight cylinder;

[0035] A plurality of water distribution branch pipe arrays are provided;

[0036] The plurality of water distribution holes are evenly arranged.

[0037] By adopting the above technical solution, the sewage entering the reaction cylinder at a uniform rate can be easily increased under the action of the aeration component to increase the dissolved oxygen content in the sewage to be treated.

[0038] Preferably, the aeration assembly includes an aeration main pipe, an aeration branch pipe, and a plurality of aerators;

[0039] One end of the aeration main pipe is suspended through the air inlet, and the other end is connected to the aeration branch pipe;

[0040] The plurality of aerators are all arranged on the top of the aeration branch pipe;

[0041] The aerator is arranged below the water distribution branch pipe.

[0042] By adopting the above technical solution, the dissolved oxygen content in the sewage can be further increased, and the sludge can be stirred to increase the reaction rate.

[0043] Preferably, a plurality of aerators are arranged in an array.

[0044] By adopting the above technical solution, the aeration reaction rate is increased and the full reaction of the sewage is achieved.

[0045] Preferably, the device further comprises a second overflow assembly, the second overflow assembly comprising a second overflow weir plate and a second annular plate, the second annular plate being arranged between the second overflow weir plate and the tank body;

[0046] The second overflow weir plate and the outer wall of the flow tube form a flow channel;

[0047] The top of the second overflow weir plate is arranged lower than the top of the flow cylinder;

[0048] The height of the second annular plate is lower than that of the water outlet.

[0049] By adopting the above technical solution, the effective discharge of the liquid treated in the sedimentation area is ensured, and the water balance rate is improved.

[0050] Preferably, the second overflow weir plate is provided with a through hole for the aeration main pipe to pass through;

[0051] The through hole is provided with a sealing member.

[0052] By adopting the above technical solution, the load-bearing capacity of the aeration main pipe is increased while the outflow of treated water is not affected.

[0053] In summary, the present application includes at least one of the following beneficial technical effects:

[0054] 1. This application can carry out aerobic biological treatment and sufficient sedimentation of sewage to ensure that the output water quality meets the standards; through the upflow setting, the water intake and water production do not affect each other; for the small amount of rural sewage and intermittent drainage, this invention can not only fully treat sewage, but also meet drainage needs.

[0055] 2. This application has a simple structure, low investment cost, low maintenance cost, and can efficiently treat sewage, making it easy to promote.

[0056] 3. This application has fewer electrical components, higher response rate and better processing effect.

[0057] 4. This application occupies a small space and is buried underground to save energy and reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a schematic diagram of the three-dimensional structure of a specific embodiment of the present application.

[0059] Figure 2 yes Figure 1 Schematic cross-sectional view of .

[0060] Figure 3 yes Figure 1 Schematic diagram of the internal components.

[0061] Figure 4 yes Figure 3 Schematic diagram of the structure of the water inlet component and aeration component.

[0062] Figure 5 yes Figure 3 Schematic diagram from another angle.

[0063] Explanation of the reference numerals: 10, flow zone; 20, sedimentation zone; 100, tank body; 110, first overflow assembly; 111, first overflow weir plate; 112, first annular plate; 113, baffle; 120, inspection port; 130, sludge collecting hopper; 200, reaction tube; 210, straight tube; 220, conical tube; 300, flow tube; 400, water inlet assembly; 410, first water inlet pipe; 420, second water inlet pipe; 430, water distribution branch pipe; 500, aeration assembly; 510, aeration main pipe; 520, aeration branch pipe; 530, aerator; 540, bracket; 600, second overflow assembly; 610, second overflow weir plate; 620, second annular plate; 700, water outlet assembly. DETAILED DESCRIPTION

[0064] The following is combined with Figure 1 To Attachment Figure 5 This application is described in further detail.

[0065] The embodiment of the present application discloses an underground SBR sewage treatment device.

[0066] Reference Figure 1 and Figure 2 , comprising a tank body 100, a reaction tube 200, a flow tube 300, a water inlet assembly 400 and an aeration assembly 500, wherein the flow tube 300 is sleeved on the outer side of the reaction tube 200, the inner wall of the flow tube 300 and the outer wall of the reaction tube 200 form a flow zone 10 with an outlet facing downward, the outer wall of the flow tube 300 and the inner wall of the tank body 100 form a sedimentation zone 20, and the interior of the reaction tube 200 is a reaction zone; sewage enters the interior of the reaction tube 200 through the water inlet assembly 400 for reaction, and is aerated by the aeration assembly 500 for aerobic biological treatment to remove organic matter and ammonia nitrogen in the sewage, and then enters the sedimentation zone 20 outside the reaction tube 200 through the interior of the flow tube 300 (i.e., the flow chamber). The sewage treatment device is mainly used for rural sewage with unstable water volume, and has the characteristics of stable effluent water quality.

[0067] Specifically, a water inlet, an air inlet and a water outlet are provided on the side wall of the tank body 100, and an inspection port 120 is provided on the top thereof for easy inspection and maintenance.

[0068] The height of the tank body 100 is greater than the height of the flow tube 300 , and prevents the treated water from flowing out of the inspection port 120 .

[0069] A sludge collecting hopper 130 is fixedly provided at the inner bottom of the tank body 100. The sludge collecting hopper 130 is arranged around the reaction cylinder 200 to facilitate the collection of precipitated sludge at the bottom of the tank body 100, effectively reduce the mud content of the upper liquid surface, and improve the water quality.

[0070] The reaction cylinder 200 is arranged inside the tank body 100, and a first overflow assembly 110 is arranged on the top thereof for overflowing the sewage after the reaction; the arrangement of the first overflow assembly 110 ensures that the tank body 100 can stably discharge water even if it is installed tilted.

[0071] Specifically, the reaction cylinder 200 includes a straight cylinder 210 and a conical cylinder 220. The conical cylinder 220 is arranged at the bottom of the straight cylinder 210. The bell mouth of the conical cylinder 220 is arranged downward and is fixed to the bottom plate of the tank body 100 to increase the sludge storage space and prevent excessive sludge from being mixed in the water overflowing after the reaction.

[0072] The bottom of the straight cylinder 210 is set lower than the bottom of the reaction cylinder 200. The reaction cylinder 200 and the straight cylinder 210 are connected by multiple connecting blocks to ensure the outflow of water overflowing from the reaction cylinder 200 to the inside of the flow cylinder 300, and then impact the outer wall of the conical cylinder 220, increase the deflection, and improve the sedimentation effect.

[0073] Furthermore, a plurality of connection blocks are arranged at intervals to improve the stability and uniformity of the outflowing water.

[0074] Among them, the water inlet assembly 400 is used to transport the sewage to be treated to the bottom of the reaction cylinder 200; specifically, it includes a first water inlet pipe 410 and a second water inlet pipe 420, one end of the first water inlet pipe 410 passes through the water inlet and is cantilevered out to the outside, and the other end is connected to the second water inlet pipe 420; the second water inlet pipe 420 is arranged inside the reaction cylinder 200, and its top is higher than the flow cylinder 300, and the connection between the first water inlet pipe 410 and the second water inlet pipe 420 is lower than the top of the second water inlet pipe 420, which can both achieve exhaust and prevent sewage backflow.

[0075] A plurality of water distribution branch pipes 430 are arranged on the surrounding side of the second water inlet pipe 420, and the plurality of water distribution branch pipes 430 are all connected to the second water inlet pipe 420, and the plurality of water distribution branch pipes 430 are arranged inside the conical cylinder 220, that is, the plurality of water distribution branch pipes 430 are arranged close to the bottom of the second water inlet pipe 420, so as to realize full reaction in the lower area inside the tank body 100.

[0076] A plurality of water distribution branches 430 are arranged in an array to achieve uniform water distribution inside the tank body 100 and improve the reaction efficiency of the sewage.

[0077] Furthermore, the longitudinal axis of the second water inlet pipe 420 is arranged parallel to the longitudinal axis of the straight cylinder 210, thereby increasing the water supply rate.

[0078] Furthermore, the longitudinal axis of the first water inlet pipe 410 is perpendicular to the longitudinal axis of the second water inlet pipe 420 , which facilitates the connection and ensures the sealing of the connection between the first water inlet pipe 410 and the second water inlet pipe 420 .

[0079] Among them, the aeration assembly 500 includes an aeration main pipe 510, an aeration branch pipe 520 and a plurality of aerators 530. One end of the aeration main pipe 510 is cantilevered through the air inlet, and the other end is connected to the aeration branch pipe 520; the plurality of aerators 530 are all arranged on the top of the aeration branch pipe 520; the aerator 530 is arranged below the water distribution branch pipe 430 to increase the dissolved oxygen content of the input sewage. At the same time, the aerator 530 can stir the sludge and increase the sewage reaction rate.

[0080] Furthermore, the aeration main pipe 510 includes a first aeration pipe and a second aeration pipe, one end of the first aeration pipe passes through the air inlet and is cantilevered outward, and the other end is connected to the top of the second aeration pipe; the second aeration pipe is arranged inside the reaction cylinder 200; the second aeration pipe and the second water inlet pipe 420 are arranged without interfering with each other.

[0081] Reference Figure 3 and Figure 4 The first overflow assembly 110 includes a first overflow weir plate 111, a first annular plate 112 and a baffle plate 113. The first annular plate 112 is arranged between the first overflow weir plate 111 and the baffle plate 113. The baffle plate 113 is provided with a plurality of overflow holes, and the top of the baffle plate 113 is arranged higher than the top of the first overflow weir plate 111, and the overflow holes are also arranged higher than the top of the first overflow weir plate 111, so as to ensure that the water from the inside of the reaction cylinder 200 overflows from the first overflow weir plate 111 and enters the flow cylinder 300 through the plurality of overflow holes.

[0082] The baffle 113 is fixed to the inner wall of the flow cylinder 300 via a connecting plate assembly.

[0083] In this embodiment, the connection plate assembly includes a plurality of connection plates, and the plurality of connection plates are arranged in an array without affecting the flow of water.

[0084] The top of the flow tube 300 is arranged higher than the top of the first overflow weir plate 111 to ensure that water flows down from the inside of the flow tube 300 .

[0085] The device also includes a second overflow assembly 600 , which includes a second overflow weir plate 610 and a second annular plate 620 . The second annular plate 620 is disposed between the second overflow weir plate 610 and the tank body 100 , that is, the second overflow weir plate 610 is fixed to the tank body 100 through the second annular plate 620 .

[0086] The second overflow weir plate 610 and the outer wall of the flow tube 300 form a flow channel; the top of the second overflow weir plate 610 is arranged lower than the top of the flow tube 300 to ensure that the precipitated water flows out from the water outlet.

[0087] The height of the second annular plate 620 is lower than the water outlet, and the top surface of the second annular plate 620 and the outer wall of the second overflow weir plate 610 and the inner wall of the tank body 100 form a receiving cavity with a certain space.

[0088] During the sewage treatment process, as the water level in the sedimentation area 20 rises, the second overflow weir plate 610 is set to cause the water to flow out of the circulation channel, and then flow into the accommodating chamber through the serrated opening on the second overflow weir plate 610. When the liquid level is higher than the water outlet, the water is output from the water outlet through the water outlet assembly. The setting of the second overflow assembly 600 ensures the effective discharge of the treated liquid in the sedimentation area 20 and improves the water outlet balance rate.

[0089] The second overflow weir plate 610 is provided with a through hole for the aeration main pipe 510 to pass through, and the through hole is provided with a seal to prevent liquid from flowing out; the through setting of the aeration main pipe 510 improves the load on the aeration main pipe 510 while not affecting the outflow of treated water.

[0090] In this embodiment, the first overflow weir plate 111 and the second overflow weir plate 610 are both annular overflow weir plates.

[0091] Specifically, the aeration branch pipe 520 includes four connecting pipes connected end to end, the four connecting pipes are arranged around the second water inlet pipe 420 , and the centers of the four connecting pipes are arranged to coincide with the centers of the plurality of water distribution branch pipes 430 .

[0092] A plurality of aerators 530 are evenly arranged around the center of the four connecting pipes to form an aeration network to fully aerate the sewage flowing out from the bottom of the plurality of water distribution branch pipes 430 .

[0093] Reference Figure 5 The longitudinal axis of the second water inlet pipe 420 is arranged to be consistent with the central axis of the straight cylinder 210, that is, the second water inlet pipe 420 is arranged at the center of the reaction cylinder 200 to ensure the uniform distribution of the input sewage inside the tank body 100.

[0094] A plurality of water distribution holes are provided at the bottom of the water distribution branch pipe 430 , and the plurality of water distribution holes are evenly arranged so that the sewage entering the reaction cylinder 200 has a uniform rate, which is convenient for increasing the dissolved oxygen content in the sewage to be treated under the action of the aeration assembly 500 .

[0095] The device does not require a secondary sedimentation tank and a sludge return system, and has a high sewage treatment efficiency. The entire device occupies a small area, has a compact layout, a flexible operation mode, a simple structure, and low operating costs. The upflow overflow setting of the reaction tube 200, the corresponding setting of the flow tube 300 and the conical tube 220, and the setting of the second overflow component 600 make the sewage treatment more efficient and ensure that the water quality after treatment meets the standards. In addition, the device can continuously take in and produce water without affecting each other. Aeration through multiple aerators 530 can not only increase the dissolved oxygen content of the sewage in the reaction tube 200, but also stir the sludge to improve the reaction efficiency.

[0096] The implementation principle of an underground SBR sewage treatment device in an embodiment of the present application is as follows: in the working state, sewage is transported to the bottom of the reaction cylinder 200 through the water inlet component 400 and aerated through the aeration component 500; the treated sewage flows upward inside the reaction cylinder 200, overflows to the flow zone 10 through the first overflow component 110, and flows to the sedimentation zone 20; the clean water after sedimentation flows upward under the action of subsequent water inlet, and flows out when the liquid level rises to the water outlet; the scheme disclosed in the present application can perform aerobic biological treatment and sufficient sedimentation on sewage to ensure that the output water quality meets the standards; through the upstream setting, the water inlet and water production do not affect each other; the invention is aimed at the small amount of rural sewage and intermittent drainage, which can not only fully treat sewage but also meet drainage needs.

[0097] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An underground SBR sewage treatment device, characterized in that: include The tank body (100) has a side wall provided with a water inlet, an air inlet and a water outlet; a reaction cylinder (200) disposed inside the tank body (100), the reaction cylinder (200) comprising a straight cylinder (210) and a conical cylinder (220), the conical cylinder (220) being disposed at the bottom of the straight cylinder (210), the bell mouth of the conical cylinder (220) being disposed downward and being fixed to the bottom plate of the tank body (100); a first overflow assembly (110) being disposed at the top of the reaction cylinder (200); the first overflow assembly (110) comprising a first overflow weir plate (111), a first annular plate (112) and a baffle plate (113), the first annular plate (112) being disposed between the first overflow weir plate (111) and the baffle plate (113); the baffle plate (113) being provided with a plurality of overflow holes, and the top of the baffle plate (113) being disposed higher than the top of the first overflow weir plate (111); A flow cylinder (300) is sleeved on the outside of the reaction cylinder (200) and located inside the tank body (100), wherein the top of the flow cylinder (300) is arranged higher than the top of the first overflow weir plate (111); the bottom of the straight cylinder (210) is arranged lower than the bottom of the flow cylinder (300); the baffle (113) is installed on the inner wall of the flow cylinder (300) through a connecting plate assembly; the inner wall of the flow cylinder (300) and the outer wall of the reaction cylinder (200) form a flow zone (10) with an outlet facing downward; The outer wall of the flow tube (300) and the inner wall of the tank body (100) form a sedimentation area (20); A water inlet assembly (400) for conveying sewage to be treated to the conical cylinder (220); An aeration assembly (500) is located at the bottom of the water inlet assembly (400) in the conical cylinder (220); In a working state, sewage is transported to the bottom of the reaction cylinder (200) through the water inlet assembly (400) and aerated through the aeration assembly (500); the treated sewage flows upward inside the reaction cylinder (200), overflows to the flow zone (10) through the first overflow assembly (110), and flows to the sedimentation zone (20); the clean water after sedimentation flows upward under the action of subsequent water inlet, and flows out when the liquid level rises to the water outlet; A second overflow assembly (600), the second overflow assembly (600) comprises a second overflow weir plate (610) and a second annular plate (620), the top of the second overflow weir plate (610) is sawtooth-shaped, the second annular plate (620) is arranged between the second overflow weir plate (610) and the tank body (100); the second overflow weir plate (610) and the outer wall of the flow cylinder (300) form a flow channel, and the second overflow weir plate (610) is located below the first overflow weir plate (111); the top of the second overflow weir plate (610) is arranged lower than the top of the flow cylinder (300); the height of the second annular plate (620) is arranged lower than the water outlet.

2. The underground SBR sewage treatment device according to claim 1 is characterized in that: The top of the tank body (100) is provided with an inspection port (120); the height of the tank body (100) is greater than the height of the flow cylinder (300); a sludge collection hopper (130) is provided at the inner bottom of the tank body (100), and the sludge collection hopper (130) is arranged around the reaction cylinder (200).

3. The underground SBR sewage treatment device according to claim 1 is characterized in that: The water inlet assembly (400) comprises a first water inlet pipe (410) and a second water inlet pipe (420), one end of the first water inlet pipe (410) is cantilevered through the water inlet, and the other end is connected to the second water inlet pipe (420); the second water inlet pipe (420) is arranged inside the reaction cylinder (200), and its top is higher than the flow cylinder (300); a plurality of water distribution branch pipes (430) are arranged on the circumference of the second water inlet pipe (420), and the plurality of water distribution branch pipes (430) are all connected to the second water inlet pipe (420); the plurality of water distribution branch pipes (430) are arranged inside the conical cylinder (220); and a plurality of water distribution holes are opened at the bottom of the water distribution branch pipe (430).

4. The underground SBR sewage treatment device according to claim 3 is characterized in that: The longitudinal axis of the second water inlet pipe (420) is arranged parallel to the longitudinal axis of the straight cylinder (210); the longitudinal axis of the first water inlet pipe (410) is arranged perpendicular to the longitudinal axis of the second water inlet pipe (420); and the connection between the first water inlet pipe (410) and the second water inlet pipe (420) is arranged below the top of the second water inlet pipe (420).

5. The underground SBR sewage treatment device according to claim 4 is characterized in that: The longitudinal axis of the second water inlet pipe (420) is arranged to be consistent with the central axis of the straight cylinder (210); the plurality of water distribution branch pipes (430) are arranged in an array; and the plurality of water distribution holes are evenly arranged.

6. The underground SBR sewage treatment device according to claim 3 is characterized in that: The aeration assembly (500) comprises an aeration main pipe (510), an aeration branch pipe (520) and a plurality of aerators (530); one end of the aeration main pipe (510) is suspended through the air inlet, and the other end is connected to the aeration branch pipe (520); the plurality of aerators (530) are all arranged on the top of the aeration branch pipe (520); the aerator (530) is arranged below the water distribution branch pipe (430).

7. The underground SBR sewage treatment device according to claim 6 is characterized in that: A plurality of the aerators (530) are arranged in an array.

8. The underground SBR sewage treatment device according to claim 6 is characterized in that: The second overflow weir plate (610) is provided with a through hole for the aeration main pipe (510) to pass through; the through hole is provided with a sealing member.

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