Sewage treatment system

Abstract

The invention discloses a sewage treatment system, which relates to the technical field of sewage treatment, and comprises an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank which are communicated in sequence, and also comprises a clean water tank, a first gas stripping reflux device and a second gas stripping reflux device, a first flat plate type baffle plate and a second flat plate type baffle plate which are parallel to each other and are distributed at an interval are arranged in the anaerobic tank; a third flat plate type baffle plate is arranged in the anoxic tank; mBBR suspended filler is arranged in the anaerobic tank, the anoxic tank and the aerobic tank; the first gas stripping reflux device is used for refluxing sludge at the bottom of the sedimentation tank into the anaerobic tank; the second gas stripping reflux device is used for refluxing the activated sludge mixed liquid in the aerobic tank into the anoxic tank; an overflow weir is arranged on one side of the sedimentation tank, clear water in the sedimentation tank can overflow into the overflow weir, and the water outlet end of the overflow weir is communicated with the clear water tank. The anoxic process, the anaerobic process and the aerobic process are combined, so that multi-stage treatment of sewage can be realized, and the comprehensiveness and the effectiveness of sewage treatment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage treatment system. Background Art

[0002] With the development of rural economy and the improvement of people's environmental awareness, the problem of rural sewage treatment has received increasing attention. Decentralized sewage treatment devices have been widely used in rural sewage treatment because they can adapt to the scattered residential characteristics of rural areas.

[0003] At present, the common decentralized sewage treatment devices generally adopt the treatment method of soft composite filler + sand filtration. This traditional treatment method uses anaerobic microorganisms attached to the soft composite filler to treat sewage, and the sewage after anaerobic treatment flows into the sand filter tank for filtration. However, in the actual operation process, the existing decentralized sewage treatment devices have exposed many defects:

[0004] (1) There is a lack of air pumping system inside the soft composite filler, and only anaerobic reaction exists in the entire treatment process; anaerobic reaction is difficult to completely decompose the pollutants in the sewage, resulting in low degradation efficiency, which makes it difficult for the treated sewage to reach the ideal water quality standards;

[0005] (2) There is no oxygen supply and stirring device in the packing pool, and short-circuiting is prone to occur when the sewage flows in the packing pool; this results in the sewage not being able to fully contact with the microorganisms on the packing, and the microorganisms cannot fully play their role in degrading pollutants, further affecting the sewage treatment effect;

[0006] (3) Due to the incomplete degradation of sewage in the early stage, the sewage still contains a lot of impurities and undecomposed pollutants, and the sand filter tank is not equipped with a backwash device. As the amount of sewage treated increases, the sand filter tank is easily blocked; once blocked, the filtering function of the sand filter tank will be seriously affected, and even the entire sand filter tank will be scrapped and need to be replaced with a new sand filter tank, which not only increases the operating cost, but also affects the normal operation of the sewage treatment device;

[0007] (4) The water after sand filtration treatment is not disinfected, and a large number of bacteria and pathogens may still exist in the water. If this undisinfected water is discharged into the environment or used in some occasions with certain water quality requirements, it is easy to breed bacteria and pose a potential threat to the surrounding environment and human health.

[0008] To sum up, the existing decentralized sewage treatment devices have obvious deficiencies in sewage treatment effect, operation stability and water quality safety, and cannot meet the growing sewage treatment needs in rural areas. Summary of the invention

[0009] The purpose of the present invention is to provide a sewage treatment system to solve the problems existing in the above-mentioned prior art, improve the sewage treatment effect, and meet the growing sewage treatment demand in rural areas.

[0010] To achieve the above object, the present invention provides the following solutions:

[0011] The present invention provides a sewage treatment system, comprising an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank connected in sequence, and also comprising a clear water tank, a first air lift reflux device and a second air lift reflux device;

[0012] The anaerobic tank is provided with a first flat plate baffle and a second flat plate baffle which are parallel to each other and spaced apart, and the first flat plate baffle is closer to the water inlet of the anaerobic tank than the second flat plate baffle, there is a gap between the bottom end of the first flat plate baffle and the bottom of the anaerobic tank, and there is a gap between the top end of the second flat plate baffle and the top of the anaerobic tank;

[0013] A third flat baffle is provided in the anoxic pool, and a gap is provided between the bottom end of the third flat baffle and the bottom of the anoxic pool;

[0014] The anaerobic tank, the anoxic tank and the aerobic tank are provided with MBBR suspended fillers;

[0015] The first air stripping reflux device is used to return the sludge at the bottom of the sedimentation tank to the anaerobic tank;

[0016] The second air stripping reflux device is used to return the activated sludge mixed liquid in the aerobic tank to the anoxic tank;

[0017] An overflow weir is arranged on one side of the sedimentation tank, and the clean water in the sedimentation tank can overflow into the overflow weir, and the water outlet end of the overflow weir is communicated with the clean water tank.

[0018] Preferably, a sterilizer is arranged in the overflow weir, and the sterilizer comprises a cylinder, a top cover and a bottom cover. The cylinder is arranged vertically and a solid disinfectant is arranged in the cylinder. The top cover is threadedly connected to the top end of the cylinder. The bottom cover comprises a circular bottom plate and a cylindrical side wall portion, and the bottom end of the side wall portion is sealed with the edge of the bottom plate. The side wall portion is sleeved on the bottom end of the cylinder, and the side wall portion is rotatably matched with the cylinder. The inner wall of the side wall portion is tightly against the outer wall of the cylinder. A horizontal first arc-shaped drug outlet is arranged at the bottom end of the cylinder, and a horizontal second arc-shaped drug outlet is arranged on the side wall portion, and the second arc-shaped drug outlet can be partially or completely opposite to the first arc-shaped drug outlet.

[0019] Preferably, both ends of the first flat-plate baffle in the horizontal direction and both ends of the second flat-plate baffle in the horizontal direction are respectively sealed and connected to the inner wall of the anaerobic tank.

[0020] Preferably, both ends of the third flat-plate baffle in the horizontal direction are respectively sealed and connected to the inner wall of the anoxic tank.

[0021] Preferably, it further comprises an aeration unit, which comprises an air pump and an aeration pipe arranged in the aerobic pool, the air pump is used to introduce air into the aerobic pool through the aeration pipe, and the air pump is powered by a solar power generation device.

[0022] Preferably, the first gas lift reflux device includes a first gas lift pipe, one end of which is arranged at the bottom of the sedimentation tank and the other end leads to the anaerobic tank, the air outlet of the air pump is connected to the bottom end of the first gas lift pipe, and the air pump is used to introduce gas into the bottom end of the first gas lift pipe.

[0023] Preferably, the second gas lift reflux device includes a second gas lift pipe, one end of which is arranged at the bottom of the aerobic tank and the other end is connected to the anoxic tank, the air outlet of the air pump is connected to the bottom end of the second gas lift pipe, and the air pump is used to introduce gas into the bottom end of the second gas lift pipe.

[0024] Preferably, the anaerobic tank, the anoxic tank, the aerobic tank and the sedimentation tank are distributed in sequence along the horizontal direction.

[0025] Preferably, the first flat-plate baffle, the second flat-plate baffle and the third flat-plate baffle are all made of metal.

[0026] Preferably, the barrel, the top cover and the bottom cover are all made of metal.

[0027] Compared with the prior art, the present invention has achieved the following technical effects:

[0028] The sewage treatment system of the present invention adopts a structure in which an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank are connected in sequence, and is equipped with a clear water tank, a first gas lift reflux device and a second gas lift reflux device. This system design can realize multi-stage treatment of sewage, and the anoxic + anaerobic + aerobic process combination, and the tanks with different functions work together. Compared with the traditional single treatment method, it greatly improves the comprehensiveness and effectiveness of sewage treatment and meets the growing sewage treatment needs in rural areas.

[0029] Furthermore, a first flat baffle and a second flat baffle are provided in the anaerobic tank in parallel and spaced apart from each other. The first flat baffle is closer to the water inlet than the second flat baffle, and the bottom of the first flat baffle is spaced from the bottom of the tank, while the top of the second flat baffle is spaced from the top of the tank. This structural design allows the sewage to form a tortuous flow path in the anaerobic tank, increases the residence time of the sewage in the tank, promotes full contact between the sewage and anaerobic microorganisms, solves the problem of lack of effective flow organization inside the traditional soft composite filler, improves the anaerobic reaction effect to a certain extent, and improves the degradation efficiency of pollutants. At the same time, the two ends of the first flat baffle in the horizontal direction and the two ends of the second flat baffle in the horizontal direction are respectively sealed and connected to the inner wall of the anaerobic tank, ensuring that the sewage flows along the designed path, avoiding short-circuiting, and further improving the anaerobic treatment effect.

[0030] Furthermore, a third flat baffle is provided in the anoxic tank, the bottom end of which is spaced from the tank bottom, and the two ends of the third flat baffle in the horizontal direction are respectively sealed and connected to the inner wall of the anoxic tank. This structure can form a specific flow route for sewage in the anoxic tank, prolong the sewage retention time, promote the sewage to fully contact with microorganisms in the anoxic environment, help improve the ability of the anoxic reaction to remove pollutants in the sewage, and further improve the sewage treatment effect.

[0031] Furthermore, MBBR suspended fillers are set in the anaerobic tank, anoxic tank and aerobic tank, providing a large number of attachment growth carriers for anaerobic microorganisms, anoxic microorganisms and aerobic microorganisms, increasing the number and activity of microorganisms, strengthening the degradation capacity of pollutants in sewage during aerobic treatment, and improving sewage treatment efficiency and effluent water quality. At the same time, the aeration unit includes an air pump and an aeration pipe set in the aerobic tank. The air pump introduces air into the aerobic tank through the aeration pipe, and the air pump is powered by a solar power generation device, which not only meets the aerobic requirements of aerobic microorganisms and ensures the smooth progress of aerobic reactions, but also realizes the sustainable use of energy, reduces operating costs, and meets the actual needs of rural areas.

[0032] Furthermore, the first gas lift reflux device returns the sludge at the bottom of the sedimentation tank to the anaerobic tank, replenishing the microbial biomass in the anaerobic tank and enhancing the anaerobic treatment capacity; the second gas lift reflux device returns the activated sludge mixed liquid in the aerobic tank to the anoxic tank, realizing the recycling treatment of sewage, providing more organic matter for the anoxic tank, promoting the anoxic reaction, and further improving the sewage treatment effect and the stability of the system.

[0033] Furthermore, an overflow weir is arranged on one side of the sedimentation tank, so that the clean water in the sedimentation tank can overflow into the overflow weir, and the water outlet of the overflow weir is connected to the clean water tank, so that the clean water after treatment can be smoothly collected. A disinfector is arranged in the overflow weir, and the disinfector includes a cylinder, a top cover and a bottom cover. Through a unique structural design, such as the rotational cooperation between the cylinder and the bottom cover, and the bottom end and the side wall of the cylinder are respectively provided with arc-shaped medicine outlets that can rotate relatively, the release amount of solid disinfectant can be controlled as needed, and the water after sand filtration treatment can be disinfected, and bacteria and pathogens in the water can be effectively killed, which solves the problem that the traditional device does not have a disinfection link, improves the safety of water quality, and avoids potential threats to the surrounding environment and human health.

[0034] Furthermore, the first flat baffle, the second flat baffle and the third flat baffle are made of metal materials, which have high strength and corrosion resistance, can ensure long-term stable operation in the sewage treatment environment, and reduce maintenance and replacement costs. The cylinder, top cover and bottom cover are made of metal materials, which also have the advantages of high strength and corrosion resistance, ensuring the normal operation of the disinfector in a complex water environment, extending the service life and ensuring the reliability of the disinfection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a structural schematic diagram of the sewage treatment system of the present invention;

[0037] Figure 2 for Figure 1 AA cross-sectional diagram of ;

[0038] Figure 3 It is a structural schematic diagram of a disinfector in a sewage treatment system of the present invention;

[0039] Figure 4 for Figure 3 BB cross-section diagram;

[0040] In the figure: 1, anaerobic tank; 2, anoxic tank; 3, aerobic tank; 4, sedimentation tank; 5, overflow weir; 6, clean water tank; 7, first flat baffle; 8, second flat baffle; 9, third flat baffle; 10, sterilizer; 101, cylinder; 102, top cover; 103, bottom cover; 104, first arc-shaped drug outlet; 105, second arc-shaped drug outlet; 11, first air lift pipe; 12, second air lift pipe; 13, aeration pipe. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The purpose of the present invention is to provide a sewage treatment system to solve the problems existing in the above-mentioned prior art, improve the sewage treatment effect, and meet the growing sewage treatment demand in rural areas.

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Figures 1 to 4 As shown, this embodiment provides a sewage treatment system, including an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3 and a sedimentation tank 4 connected in sequence, and also includes a clear water tank 6, a first air stripping reflux device and a second air stripping reflux device;

[0045] The anaerobic tank 1 is provided with a first flat plate baffle 7 and a second flat plate baffle 8 which are parallel to each other and spaced apart, and the first flat plate baffle 7 is closer to the water inlet of the anaerobic tank 1 than the second flat plate baffle 8, and there is a gap between the bottom end of the first flat plate baffle 7 and the bottom of the anaerobic tank 1, and there is a gap between the top end of the second flat plate baffle 8 and the top of the anaerobic tank 1; the arrangement of the first flat plate baffle 7 and the second flat plate baffle 8 enables the sewage to form a tortuous flow path in the anaerobic tank 1, thereby increasing the residence time of the sewage in the anaerobic tank 1, promoting full contact between the sewage and the anaerobic microorganisms, solving the problem of lack of effective flow state organization inside the traditional soft composite filler, improving the anaerobic reaction effect to a certain extent, and improving the degradation efficiency of pollutants;

[0046] A third flat baffle 9 is provided in the anoxic tank 2, and a gap is formed between the bottom end of the third flat baffle 9 and the bottom of the anoxic tank 2; the provision of the third flat baffle 9 enables the sewage to form a specific flow route in the anoxic tank 2, prolongs the sewage retention time, promotes the sewage to fully contact with the microorganisms in the anoxic environment, helps to improve the ability of the anoxic reaction to remove pollutants in the sewage, and further improves the sewage treatment effect;

[0047] MBBR suspended fillers are respectively arranged in the anaerobic tank 1, the anoxic tank 2 and the aerobic tank 3, which provide a large number of attachment and growth carriers for anaerobic microorganisms, anoxic microorganisms and aerobic microorganisms, increase the number and activity of microorganisms, strengthen the degradation capacity of pollutants in sewage in the aerobic treatment process, and improve the sewage treatment efficiency and effluent water quality;

[0048] The first air lift return device is used to return the sludge at the bottom of the sedimentation tank 4 to the anaerobic tank 1, replenishing the amount of microorganisms in the anaerobic tank 1 and enhancing the anaerobic treatment capacity;

[0049] The second airlift reflux device is used to return the activated sludge mixed liquid in the aerobic tank 3 to the anoxic tank 2, realizing the recycling treatment of sewage, providing more organic matter for the anoxic tank 2, promoting the anoxic reaction, and further improving the sewage treatment effect and the stability of the system;

[0050] An overflow weir 5 is provided on one side of the sedimentation tank 4 , and the clean water in the sedimentation tank 4 can overflow into the overflow weir 5 , and the outlet end of the overflow weir 5 is connected to the clean water tank 6 , so that the smooth collection of the treated clean water is achieved through the overflow weir 5 .

[0051] The sewage treatment system of this embodiment adopts a structure in which an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3 and a sedimentation tank 4 are connected in sequence, and is equipped with a clear water tank 6, a first gas lift reflux device and a second gas lift reflux device. This system design can achieve multi-stage treatment of sewage, and anoxic + anaerobic + aerobic process combination, and tanks with different functions work together. Compared with the traditional single treatment method, it greatly improves the comprehensiveness and effectiveness of sewage treatment and meets the growing sewage treatment needs in rural areas.

[0052] In the optional scheme of this embodiment, it is more preferred that a sterilizer 10 is arranged in the overflow weir 5, and the sterilizer 10 includes a cylinder 101, a top cover 102 and a bottom cover 103. The cylinder 101 is vertically arranged and a solid disinfectant is arranged in the cylinder 101. The top cover 102 is threadedly connected to the top of the cylinder 101. The bottom cover 103 includes a circular bottom plate and a cylindrical side wall portion, and the bottom end of the side wall portion is sealed and connected to the edge of the bottom plate. The side wall portion is sleeved on the bottom end of the cylinder 101, and the side wall portion is rotatably matched with the cylinder 101. The inner wall of the side wall portion is close to the outer wall of the cylinder 101. The bottom end of the cylinder 101 is provided with A horizontal first curved medicine outlet 104 is provided with a horizontal second curved medicine outlet 105 on the side wall, and the second curved medicine outlet 105 can partially or completely face the first curved medicine outlet 104; when in use, the release amount of the solid disinfectant can be controlled by manually changing the size of the area of ​​the second curved medicine outlet 105 facing the first curved medicine outlet 104 as needed, so as to disinfect the water after the sand filtration treatment, effectively kill the bacteria and pathogens in the water, solve the problem that the traditional device has no disinfection link, improve the water quality safety, and avoid potential threats to the surrounding environment and human health.

[0053] In the optional scheme of this embodiment, it is more preferred that the two ends of the first flat-plate baffle 7 and the two ends of the second flat-plate baffle 8 in the horizontal direction are respectively sealed and connected to the inner wall of the anaerobic tank 1, ensuring that the sewage flows along the designed path, avoiding short-circuiting, and further improving the anaerobic treatment effect.

[0054] In the optional scheme of this embodiment, it is more preferred that the two ends of the third flat baffle 9 in the horizontal direction are sealed and connected to the inner wall of the anoxic tank 2 respectively, ensuring that the sewage flows according to the designed path, avoiding short-circuiting phenomenon, and further improving the anaerobic treatment effect.

[0055] In the optional scheme of this embodiment, it is more preferred to further include an aeration unit, which includes an air pump and an aeration pipe 13 arranged in the aerobic tank 3. The air pump is used to introduce air into the aerobic tank 3 through the aeration pipe 13, and the air pump is powered by a solar power generation device; the aeration unit not only meets the aerobic requirements of aerobic microorganisms and ensures the smooth progress of aerobic reactions, but also realizes the sustainable use of energy, reduces operating costs, and meets the actual needs of rural areas.

[0056] In this embodiment, specifically: the first gas lift reflux device includes a first gas lift pipe 11, one end of the first gas lift pipe 11 is arranged at the bottom of the sedimentation tank 4, and the other end leads to the anaerobic tank 1, and the air outlet of the air pump is also connected to the bottom end of the first gas lift pipe 11, and the air pump can introduce gas into the bottom end of the first gas lift pipe 11.

[0057] In this embodiment, specifically: the second gas lift reflux device includes a second air pump and a second gas lift pipe 12, one end of the second gas lift pipe 12 is arranged at the bottom of the aerobic tank 3, and the other end leads to the anoxic tank 2, the air outlet of the air pump is also connected to the bottom end of the second gas lift pipe 12, and the air pump can pass gas into the bottom end of the second gas lift pipe 12.

[0058] The air pump in this embodiment is used for aeration of the aerobic pool, air supply to the first air lift pipe 11 and air supply to the second air lift pipe 12 at the same time, and has low cost.

[0059] In the optional scheme of this embodiment, it is more preferred that the anaerobic tank 1, the anoxic tank 2, the aerobic tank 3 and the sedimentation tank 4 are distributed in sequence along the horizontal direction, with a compact structure and reasonable distribution.

[0060] Among the optional schemes of this embodiment, it is more preferred that the materials of the first flat-plate baffle 7, the second flat-plate baffle 8 and the third flat-plate baffle 9 are all metal, which has high strength and corrosion resistance, can ensure long-term stable operation in a sewage treatment environment, and reduce maintenance and replacement costs.

[0061] Among the optional schemes of this embodiment, it is more preferred that the materials of the cylinder 101, the top cover 102 and the bottom cover 103 are all metal, which also has the advantages of high strength and corrosion resistance, ensuring that the sterilizer 10 works normally in a complex water environment, extending the service life and ensuring the reliability of the disinfection process.

[0062] The working principle of the sewage treatment system of this embodiment is as follows:

[0063] When the sewage treatment system of this embodiment is working, the sewage first flows into the anaerobic tank 1, and forms a tortuous path under the guidance of the first flat baffle 7 and the second flat baffle 8, thereby extending the residence time and allowing the anaerobic microorganisms to fully decompose the organic matter in the sewage; then it enters the anoxic tank 2, and the third flat baffle 9 allows the sewage to form a specific flow route. In the anoxic environment, the microorganisms use the residual organic matter and the sewage returned from the aerobic tank 3 to perform a denitrification reaction to remove nitrogen; then the sewage enters the aerobic tank 3, and the MBBR suspended filler provides a place for aerobic microorganisms to attach, and air is introduced into the aeration unit to promote the aerobic microorganisms to completely decompose the remaining organic matter; then the sewage flows into the sedimentation tank 4, and the suspended filler Floating solids and microorganisms are precipitated, and the supernatant flows to the clean water tank 6 through the overflow weir 5; in this process, the first air lift reflux device returns the sludge at the bottom of the sedimentation tank 4 to the anaerobic tank 1 to supplement the microbial mass and enhance the anaerobic treatment capacity; the second air lift reflux device returns the activated sludge mixed liquid in the aerobic tank 3 to the anoxic tank 2 to promote the denitrification reaction; finally, when the clean water flows through the disinfector 10 in the overflow weir 5, the solid disinfectant in the cylinder 101 is dissolved by the water entering the cylinder 101 through the second arc-shaped drug outlet 105 and the first arc-shaped drug outlet 104, and flows away with the water and dissolves in the water, killing bacteria and pathogens in the water, and then the clean water flows into the clean water tank 6 to complete the sewage treatment.

[0064] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A sewage treatment system, characterized in that: It includes an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank which are connected in sequence, and also includes a clear water tank, a first gas lift reflux device and a second gas lift reflux device; The anaerobic tank is provided with a first flat plate baffle and a second flat plate baffle which are parallel to each other and spaced apart, and the first flat plate baffle is closer to the water inlet of the anaerobic tank than the second flat plate baffle, there is a gap between the bottom end of the first flat plate baffle and the bottom of the anaerobic tank, and there is a gap between the top end of the second flat plate baffle and the top of the anaerobic tank; A third flat baffle is provided in the anoxic pool, and a gap is provided between the bottom end of the third flat baffle and the bottom of the anoxic pool; The anaerobic tank, the anoxic tank and the aerobic tank are provided with MBBR suspended fillers; The first air stripping reflux device is used to return the sludge at the bottom of the sedimentation tank to the anaerobic tank; The second air stripping reflux device is used to return the activated sludge mixed liquid in the aerobic tank to the anoxic tank; An overflow weir is arranged on one side of the sedimentation tank, and the clean water in the sedimentation tank can overflow into the overflow weir, and the water outlet end of the overflow weir is communicated with the clean water tank.

2. The sewage treatment system according to claim 1, characterized in that: A sterilizer is arranged in the overflow weir, and the sterilizer includes a cylinder, a top cover and a bottom cover. The cylinder is arranged vertically and a solid disinfectant is arranged in the cylinder. The top cover is threadedly connected to the top end of the cylinder. The bottom cover includes a circular bottom plate and a cylindrical side wall portion, and the bottom end of the side wall portion is sealed and connected to the edge of the bottom plate. The side wall portion is sleeved on the bottom end of the cylinder, and the side wall portion is rotatably matched with the cylinder. The inner wall of the side wall portion is tightly against the outer wall of the cylinder. A horizontal first arc-shaped drug outlet is arranged at the bottom end of the cylinder, and a horizontal second arc-shaped drug outlet is arranged on the side wall portion. The second arc-shaped drug outlet can be partially or completely opposite to the first arc-shaped drug outlet.

3. The sewage treatment system according to claim 1, characterized in that: Both ends of the first flat-plate baffle in the horizontal direction and both ends of the second flat-plate baffle in the horizontal direction are respectively sealed and connected to the inner wall of the anaerobic tank.

4. The sewage treatment system according to claim 1, characterized in that: Both ends of the third flat baffle in the horizontal direction are respectively sealed and connected to the inner wall of the anoxic pool.

5. The sewage treatment system according to claim 1, characterized in that: It also includes an aeration unit, which includes an air pump and an aeration pipe arranged in the aerobic pool. The air pump is used to introduce air into the aerobic pool through the aeration pipe, and the air pump is powered by a solar power generation device.

6. The sewage treatment system according to claim 5, characterized in that: The first gas lift reflux device includes a first gas lift pipe, one end of which is arranged at the bottom of the sedimentation tank and the other end leads to the anaerobic tank. The air outlet of the air pump is connected to the bottom end of the first gas lift pipe, and the air pump is used to introduce gas into the bottom end of the first gas lift pipe.

7. The sewage treatment system according to claim 5, characterized in that: The second gas lift reflux device includes a second gas lift pipe, one end of which is arranged at the bottom of the aerobic tank and the other end is connected to the anoxic tank. The gas outlet of the air pump is connected to the bottom end of the second gas lift pipe, and the air pump is used to introduce gas into the bottom end of the second gas lift pipe.

8. The sewage treatment system according to claim 1, characterized in that: The anaerobic tank, the anoxic tank, the aerobic tank and the sedimentation tank are sequentially distributed along the horizontal direction.

9. The sewage treatment system according to claim 1, characterized in that: The materials of the first flat-plate baffle, the second flat-plate baffle and the third flat-plate baffle are all metal.

10. The sewage treatment system according to claim 2, characterized in that: The materials of the cylinder, the top cover and the bottom cover are all metal.

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