Sewage treatment system

Abstract

The utility model discloses a sewage treatment system, which relates to the technical field of sewage treatment equipment and comprises an anaerobic biochemical reactor, an aerobic biochemical reactor and a settling tank, and both the anaerobic biochemical reactor and the aerobic biochemical reactor are connected with the settling tank; each of the anaerobic biochemical reactor and the aerobic biochemical reactor comprises a reactor main body, the reactor main body comprises a shell cylinder, and a plurality of eccentric plates which are sequentially staggered layer by layer from bottom to top are arranged in the shell cylinder; reverse-flow inclined net-shaped weir plates are arranged on the upper face and the lower face of the eccentric plate. A filler ball is also arranged on the eccentric plate; the sewage is baffled in the reactor, so that the contact time of the sewage and the sludge is prolonged, and the sewage treatment effect is improved; activated sludge films are formed on the netlike weir plates and the filler rings which are arranged on the eccentric plate at intervals, so that the area is large, and the reaction rate can be increased; net-shaped weir plates opposite to the water flow direction are arranged above and below the eccentric plate, so that the flow speed of sewage in the reactor can be reduced, and the loss of sludge biological membranes is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment equipment, in particular to a sewage treatment system. Background Art

[0002] Green water and green mountains are as valuable as gold and silver. With the development of economy, people pay more and more attention to the environment, especially the requirements for total nitrogen and ammonia nitrogen content in water are getting higher and higher. They are no longer limited to the implementation of the Class A (or B) standard of the "Pollutant Discharge Standard for Urban Wastewater Treatment Plants (GB18918-2002)", but are as close as possible to the standard of the "Surface Water Environmental Quality Standard (GB 3838-2002)". This puts higher requirements on sewage treatment technology.

[0003] Existing sewage treatment equipment includes an upflow anaerobic sludge blanket (UASB) reactor that uses anaerobic biological technology to treat sewage well. However, the UASB reactor still faces the problem of being unable to resolve the contradiction between increasing the organic load rate and preventing sludge loss, and being unable to deal with toxic and biodegradable substances. The anaerobic baffled reactor (ABR) is a high-efficiency anaerobic reactor composed of multiple compartments. Multiple baffles are set in the reactor to divide the reactor into several upstream and downstream compartments connected in series, so that the wastewater can fully contact the microorganisms in the bottom suspended sludge layer and the packing layer while flowing up and down in the reactor, and the principle of iron-carbon micro-electrolysis is used to improve the treatment efficiency. Compared with the anaerobic baffled reactor, the upflow anaerobic sludge blanket does not require a three-phase separator, and forms a microbial chain with stable performance and rich population in different compartments, which adapts to the water quality flowing through different compartments and stabilizes the treatment effect.

[0004] However, in existing anaerobic baffled reactors, some reactors have severe interlayer turbulence, severe sludge loss, and low treatment efficiency. Utility Model Content

[0005] In view of the defects of the prior art, the purpose of the utility model is to provide a sewage treatment system that can effectively avoid the shortcomings of the existing biochemical reactors, prolong the contact time between sewage and sludge, form a large and stable biofilm, and at the same time avoid sludge loss, ensuring the biochemical reaction environment in the reactor, thereby improving the sludge treatment efficiency and treatment effect.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A sewage treatment system comprises an anaerobic biochemical reactor, an aerobic biochemical reactor and a sedimentation tank, wherein the anaerobic biochemical reactor and the aerobic biochemical reactor are both connected to the sedimentation tank;

[0008] The anaerobic biochemical reactor and the aerobic biochemical reactor both include a reactor body, and the reactor body includes an outer shell cylinder, wherein a plurality of eccentric plates are arranged inside the outer shell cylinder and are arranged in layers from bottom to top in an interlaced manner; mesh weir plates inclined against the flow are arranged on the upper and lower sides of the eccentric plates to slow down the flow rate of sewage; filler balls are also arranged on the eccentric plates, which can rotate freely under the impact of water flow to eliminate sludge with poor biological activity.

[0009] Furthermore, the filler balls are plastic ball rings or nylon balls.

[0010] Furthermore, the filler balls are arranged at intervals from the mesh weir plate.

[0011] Furthermore, the eccentric plate is connected to the inner wall of the outer shell cylinder by welding.

[0012] Furthermore, the mesh weir plate is in an elliptical arc shape to decelerate the water flow in and out of the mesh weir plate.

[0013] Furthermore, the outer shell body is also provided with a drain port and a spare port, respectively, and the drain port and the spare port are both arranged at the bottom of the outer shell body.

[0014] Furthermore, the anaerobic biochemical reactor also includes a first water inlet and a first water outlet, wherein the first water inlet is arranged on one side of the bottom of the outer shell cylinder, the first water inlet is connected to a first water inlet pipe, and a distributor is arranged at the end of the first water inlet pipe located at the reactor body; the first water outlet is arranged on one side of the top of the outer shell cylinder.

[0015] Furthermore, the aerobic biochemical reactor includes a second water inlet and a second water outlet, wherein the second water inlet is arranged on one side of the top of the outer shell cylinder, the second water inlet is connected to a second water inlet pipe, and the second water inlet pipe is located at the end of the reactor body and a distributor is arranged; the second water outlet is arranged on one side of the bottom of the outer shell cylinder, the second water outlet is connected to a second water outlet pipe, and the second water outlet pipe is in an inverted U shape to maintain the liquid level height in the reactor.

[0016] Furthermore, the sedimentation tank comprises a plurality of sedimentation chambers separated by partitions, and each sedimentation chamber is provided with a sludge drain valve.

[0017] Further, the sedimentation tank is divided into an anaerobic sedimentation tank and an aerobic sedimentation tank, the anaerobic sedimentation tank includes a first anaerobic sedimentation chamber, a second anaerobic sedimentation chamber, a third anaerobic sedimentation chamber, a fourth anaerobic sedimentation chamber and a fifth anaerobic sedimentation chamber arranged in sequence, the first water outlet is connected to the first anaerobic sedimentation chamber, the fourth anaerobic sedimentation chamber is equipped with a first water pump, and the first water pump is connected to the first water inlet pipe;

[0018] The aerobic sedimentation tank comprises a first aerobic sedimentation chamber, a second aerobic sedimentation chamber, a third aerobic sedimentation chamber, a fourth aerobic sedimentation chamber and a fifth aerobic sedimentation chamber which are arranged in sequence, the second water outlet pipe is connected to the first aerobic sedimentation chamber, the fourth aerobic sedimentation chamber is equipped with a second water pump, and the second water pump is connected to the second water inlet pipe.

[0019] Furthermore, the fifth aerobic sedimentation chamber is equipped with a reflux pump, which is connected to the first anaerobic sedimentation chamber through a reflux pipe to pump the aerobic treated water back to the first anaerobic sedimentation chamber to keep a certain amount of aerobic treated water returning to the anaerobic system.

[0020] Compared with the prior art, the utility model has the following advantages and positive effects:

[0021] 1. The utility model has mesh weir plates arranged above and below the eccentric plate in the opposite direction to the water flow direction, thereby reducing the flow rate of sewage in the reactor and effectively reducing the loss of sludge biofilm; at the same time, an activated sludge film is formed on the mesh weir plates and filler balls arranged at intervals on the eccentric plate, which increases the area of ​​the biofilm and is beneficial to improving the biochemical reaction rate; at the same time, the rotation of the filler balls on the eccentric plate can ensure that the sludge with poor activity in the reactor is taken away by water, and the sludge with strong activity is selectively left, ensuring that the reactor has a strong sewage treatment capacity.

[0022] 2. The staggered eccentric plates in the reactor body make the sewage flow baffled, prolonging the contact time with the sludge and increasing the probability of contact with the sludge;

[0023] 3. The utility model sets a partition in the sedimentation tank, so that the "dead sludge" with low biological activity can be effectively settled and discharged through the drain valve at the bottom of the sedimentation tank, ensuring that high-activity sludge is retained in the reactor.

[0024] 4. The utility model provides a plurality of settling chambers, so that a small amount of activated sludge carried out by water from the anaerobic reactor and the aerobic reactor can be effectively recovered, thereby ensuring a sufficient amount of sludge in the reactor and ensuring high working efficiency of the reactor.

[0025] 5. The utility model skillfully combines the anaerobic reactor and the aerobic reactor, realizes the series connection of the anaerobic reactor and the aerobic reactor, makes the whole system easy to operate, and is conducive to automation; at the same time, the anaerobic sludge and the aerobic sludge are controlled separately, and there will be no mixing, thus ensuring the purity of the anaerobic and aerobic, and improving their respective treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0027] Figure 1 It is a schematic diagram of the structure of the anaerobic biochemical reactor and the aerobic biochemical reactor of the utility model;

[0028] Figure 2 It is a top view of the eccentric plate of the utility model;

[0029] Figure 3 It is a side view of the eccentric plate of the utility model;

[0030] Figure 4 It is a structural schematic diagram of the sedimentation tank of the utility model;

[0031] Figure 5 It is a schematic diagram of the overall structure of the utility model;

[0032] Figure 6 This is a schematic diagram of COD content in sewage in comparative experiment three of the utility model;

[0033] Figure 7 This is a schematic diagram of NH3-N content in sewage in comparative experiment 3 of the utility model;

[0034] Figure 8 This is a schematic diagram of TN content in sewage in comparative experiment three of the utility model.

[0035] In the figure: 1, anaerobic biochemical reactor; 2, aerobic biochemical reactor; 3, sedimentation tank; 4, outer shell cylinder; 5, eccentric plate; 6, mesh weir plate; 7, column; 8, packing ball; 9, flow hole; 10, distributor; 11, spare port; 12, drain port;

[0036] 101, first water inlet; 102, first water outlet; 103, first water inlet pipe; 104, first outlet

[0037] water pipe;

[0038] 201, second water inlet; 202, second water outlet; 203, second water inlet pipe; 204, second outlet

[0039] water pipe; 205, air inlet; 206, gas distributor;

[0040] 301, anaerobic sedimentation tank; 302, aerobic sedimentation tank; 303, partition; 304, sludge drain valve;

[0041] 3011, first anaerobic sedimentation chamber; 3012, second anaerobic sedimentation chamber; 3013, third anaerobic sedimentation chamber; 3014, fourth anaerobic sedimentation chamber; 3015, fifth anaerobic sedimentation chamber; 3016, first water pump;

[0042] 3021, first aerobic sedimentation chamber; 3022, second aerobic sedimentation chamber; 3023, third aerobic sedimentation chamber; 3024, fourth aerobic sedimentation chamber; 3025, fifth aerobic sedimentation chamber; 3026, second water pump;

[0043] 3027. Reflux pump. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the utility model. Unless otherwise specified, all technical and scientific terms used in the utility model have the same meanings as those commonly understood by ordinary technicians in the technical field to which the utility model belongs. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0045] Embodiment 1

[0046] In a typical implementation of the present invention, Figure 1-5 As shown, a sewage treatment system is provided, including an anaerobic biochemical reactor 1, an aerobic biochemical reactor 2 and a sedimentation tank 3, wherein the anaerobic biochemical reactor 1 and the aerobic biochemical reactor 2 are both connected to the sedimentation tank 3;

[0047] The anaerobic biochemical reactor 1 and the aerobic biochemical reactor 2 both include a reactor body, which includes an outer shell cylinder 4, and a plurality of eccentric plates 5 are arranged inside the outer shell cylinder, which are arranged in a staggered manner from bottom to top. The upper and lower sides of the eccentric plates are arranged with countercurrent inclined mesh weir plates 6, and the inclination direction is opposite to the flow direction of the sewage in this layer, which can form a barrier to slow down the flow rate of sewage, slow down the turbulence of sewage, and transform the turbulence of sewage into a flow form close to laminar flow, avoid the loss of sludge biofilm, and at the same time, prolong the residence time of sewage in the reactor, which is conducive to obtaining a better sewage treatment effect. Filling balls 8 are also arranged on the eccentric plate 5, which can rotate freely under the impact of water flow, can eliminate sludge with poor biological activity, and improve the efficiency of biochemical reaction.

[0048] like Figure 3 As shown, a vertical column 7 is arranged on the eccentric plate 5, and a freely rotatable filler ball 8 is strung on the column. The filler ball can be a plastic ball ring or a nylon ball. The filler ball and the mesh weir plate surface can form a sludge biofilm. The filler ball and the mesh weir plate are arranged at intervals on the eccentric plate, thereby increasing the biofilm area, which is conducive to full contact between sewage and biofilm and improving sewage treatment efficiency. When the filler ball rotates under the impact of the water flow, the sludge with poor biological activity can be eliminated to improve the efficiency of the biochemical reaction.

[0049] like Figure 1-3 As shown, the multi-layer eccentric plates 5 are evenly arranged up and down, and the distance between two adjacent layers of eccentric plates is 25-35cm, and there are several pillars for support. The eccentric plate 5 is a circular plate adapted to the outer shell cylinder, and is welded and fixed to the inner wall of the outer shell cylinder from the circumferential side. A through hole 9 is opened on one side of the eccentric plate 5 as a channel for water flow to pass through, as shown in FIG. Figure 2 As shown, in this embodiment, the flow holes are set as elliptical holes. In other embodiments, the flow holes can also be set as other shapes, and the number can be one or more, but they are all set on one side of the center of the eccentric plate, in an eccentric arrangement. The flow holes of adjacent eccentric plates are staggered in opposite directions to change the direction of sewage flow, form baffles, and extend the residence time of sewage in the reactor so that sewage and activated sludge can be repeatedly contacted to improve the sewage treatment effect. In addition, in order to better remove "dead" sludge with poor biological activity, the filler balls are evenly arranged in the area outside the flow holes on the eccentric plate, which can cover the entire eccentric plate to improve the reaction efficiency.

[0050] like Figure 3 As shown, the inclined mesh weir plate 6 has an elliptical arc cross section and is fixed to the eccentric plate by welding, which can ensure stability during the sewage treatment process. It should be noted that the mesh weir plate 6 is arranged on both the upper and lower sides of the eccentric plate 5, so that between two adjacent layers of eccentric plates, the inclined mesh weir plate extends relatively from the upper and lower sides to block and slow down the water flow in the space, transforming turbulence into laminar flow and reducing sludge loss.

[0051] like Figure 1 As shown, the bottom of the outer shell cylinder 4 is provided with a drain port 12 for draining the sewage in the reactor and a spare port 11 for other purposes, and the top cover is provided with a manhole and a drain port (not shown in the figure) for use during maintenance and draining.

[0052] The anaerobic biochemical reactor 1 also includes a first water inlet 101 and a first water outlet 102. The first water inlet 101 is arranged on one side of the bottom of the outer shell cylinder. The first water inlet is connected to the first water inlet pipe 203. The first water inlet pipe 103 is located at the end of the reactor body. A distributor 10 is arranged to make the incoming water flow out evenly and prevent jet flow; the first water outlet 102 is arranged on one side of the top of the outer shell cylinder 4.

[0053] The aerobic biochemical reactor 2 includes a second water inlet 201 and a second water outlet 202. The second water inlet 201 is arranged on one side of the top of the outer shell cylinder, and the second water inlet is connected to a second water inlet pipe 203. The second water inlet pipe 203 is located at the end of the reactor body and is also provided with a distributor 10. The second water outlet 202 is arranged on one side of the bottom of the outer shell cylinder 4, and the second water outlet 202 is connected to a second water outlet pipe 204. The second water outlet pipe is in an inverted U shape 204, so that a certain height of liquid level is maintained in the reactor. In addition, an air inlet is also arranged on the top of the aerobic biochemical reactor, and an air inlet pipe extends from the air inlet into the top of the outer shell cylinder and extends to the bottom, for passing the gas required for the aerobic reaction, and a gas distributor is arranged at the bottom of the aerobic reactor for uniform air intake.

[0054] like Figure 4-5 As shown, as an auxiliary device of the reactor, the sedimentation tank 3 includes a plurality of sedimentation chambers separated by a plurality of partitions 303, and a sludge drain valve 304 is provided at the bottom of each sedimentation chamber.

[0055] Specifically, the sedimentation tank 3 is divided into an anaerobic sedimentation tank 301 and an aerobic sedimentation tank 302. The anaerobic sedimentation tank 301 includes a first anaerobic sedimentation chamber 3011, a second anaerobic sedimentation chamber 3012, a third anaerobic sedimentation chamber 3013, a fourth anaerobic sedimentation chamber 3014 and a fifth anaerobic sedimentation chamber 3015 arranged in sequence. The first outlet pipe 104 is connected to the first anaerobic sedimentation chamber 3011. The fourth anaerobic sedimentation chamber is equipped with a first water pump 3016, and the first water pump 3016 is connected to the first inlet pipe 103.

[0056] In the anaerobic sedimentation tank, the sewage after anaerobic reaction first enters the first anaerobic sedimentation chamber through the first outlet pipe, overflows after sedimentation, and enters the second, third, fourth, and fifth anaerobic sedimentation chambers in turn. The first water pump pumps the clean water in the fourth anaerobic sedimentation chamber into the anaerobic reactor through the first inlet pipe.

[0057] The aerobic sedimentation tank 302 includes a first aerobic sedimentation chamber 3021, a second aerobic sedimentation chamber 3022, a third aerobic sedimentation chamber 3023, a fourth aerobic sedimentation chamber 3024 and a fifth aerobic sedimentation chamber 3025 which are arranged in sequence. The second outlet pipe 204 is connected to the first aerobic sedimentation chamber 3021. A second water pump 3026 is installed in the fourth aerobic sedimentation chamber. The second water pump 3016 is connected to the second water inlet pipe 203. In the aerobic sedimentation tank, the sewage after aerobic reaction first enters the first aerobic sedimentation chamber through the first outlet pipe, overflows after sedimentation, and enters the second, third, fourth and fifth aerobic sedimentation chambers in sequence. The first water pump pumps the clean water in the fourth aerobic sedimentation chamber into the aerobic reactor through the first water inlet pipe.

[0058] Among them, the first aerobic sedimentation chamber 3021 is arranged after the fifth anaerobic sedimentation chamber 3015 and is arranged adjacently, so that the sewage after anaerobic reaction can enter the aerobic reaction tank after sedimentation, so that the dead sludge and the sludge with low activity can be separated by sedimentation, and the sludge with strong activity can be retained, so as to improve the reaction efficiency and enhance the sewage treatment capacity. Therefore, the fifth baffle of the anaerobic sedimentation tank 301 is set higher than the previous baffle to ensure that the water overflowing into the aerobic sedimentation tank remains clear and has more dissolved oxygen.

[0059] The space of the first anaerobic sedimentation chamber 3011 and the first aerobic sedimentation chamber 3021 is larger than that of other sedimentation chambers to quickly reduce the water inlet speed and make the sludge settle well. The partitions of the first anaerobic sedimentation chamber and the first aerobic sedimentation chamber are in a "V" shape. The angle of the V is 150°, so as to better intercept the poorly active and dead sludge.

[0060] The fifth aerobic sedimentation chamber is equipped with a reflux pump 3027, which is connected to the first anaerobic sedimentation chamber 3011 through a reflux pipe to pump the aerobic treated water back to the first anaerobic sedimentation chamber so that part of the water is refluxed for further treatment.

[0061] It should be noted that the gas in the anaerobic reactor is biogas produced by COD degradation, and the gas in the aerobic reactor is blown air.

[0062] According to the principles of fluid mechanics and the different requirements of anaerobic and aerobic processes, the mesh holes on the mesh weir plates of the anaerobic reactor are designed to be 10-60 mesh, and the mesh holes on the mesh weir plates of the aerobic reactor are 4-20 mesh. By ingeniously designing the inclined mesh weir plate structure in the tower, the flow type of sewage in the reactor is controlled, so that the flow in the anaerobic reactor is in a transitional state, and the sewage flow in the aerobic reactor is in a relatively weak turbulent state, reducing the loss of sludge biofilm formed on the mesh weir plates and rotating filler balls.

[0063] In order to verify the technical effect of setting the inclined mesh weir plate in this embodiment, three comparative experiments were conducted for application comparison:

[0064] Comparative experiment 1:

[0065] According to the structural form of the above reactor, two types of reactors are made, one is a reactor with pure ball ring packing, and the other is a reactor with a solid inclined weir plate. The two systems have the same volume. After the sludge from the existing sewage station has settled for 24 hours, the upper layer of clean water is pumped into the corresponding sedimentation tank, and the concentrated sludge water is added to the reactor until it is full. Fill the sedimentation tank with clean water. Start the reactor water inlet pump. After half a month, stop the two systems, let them settle naturally for 48 hours, and pump out the upper layer of clean water in the sedimentation tank. Compare the sludge amount of the two systems. The result is that the amount of sludge discharged from the pure ball ring packing reactor is about twice that of the solid inclined weir plate reactor.

[0066] Comparative experiment 2:

[0067] According to the structural form of the above reactor, two types of reactors are made, one is a reactor with pure ball ring filler, and the other is a reactor with a mesh plate for the inclined weir plate. The two systems have the same volume. After the sludge from the existing sewage station has settled for 24 hours, the upper layer of clean water is pumped into the corresponding sedimentation tank, and the concentrated sludge water is added to the reactor until it is full. Fill the sedimentation tank with clean water. Start the reactor water inlet pump. After half a month, stop the two systems, let them settle naturally for 48 hours, and pump out the upper layer of clean water in the sedimentation tank. Compare the sludge amount of the two systems. The result is that the amount of sludge discharged from the pure ball ring filler reactor is about 2.8 times that of the mesh inclined weir plate reactor.

[0068] Comparative experiment three:

[0069] Take sewage from the sewage treatment plant, including COD: 195.6mg / L, NH3-N: 27.72mg / L, TN: 28.56mg / L, glucose 250mg / L, add it to the reactor that has been domesticated sludge, take samples and analyze them at regular intervals, which is the experimental group. The same sewage, the same scheme, is added to the reactor without inclined mesh weir plates, which is the control group. Take samples and analyze them at regular intervals to compare the removal of COD, NH3-N and TN. Figure 6-8 As shown, it can be seen that the reactor provided with an inclined mesh weir plate has a better sewage treatment effect.

[0070] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sewage treatment system, characterized in that: It includes an anaerobic biochemical reactor, an aerobic biochemical reactor and a sedimentation tank, wherein the anaerobic biochemical reactor and the aerobic biochemical reactor are both connected to the sedimentation tank; The anaerobic biochemical reactor and the aerobic biochemical reactor both include a reactor body, and the reactor body includes an outer shell cylinder, wherein a plurality of eccentric plates are arranged in layers from bottom to top in an interlaced manner inside the outer shell cylinder; mesh weir plates inclined in countercurrent are arranged on the upper and lower sides of the eccentric plates; and filler balls are also arranged on the eccentric plates.

2. A sewage treatment system according to claim 1, characterized in that: The packing balls are plastic ball rings or nylon balls.

3. A sewage treatment system according to claim 1, characterized in that: The mesh weir plate is in an elliptical arc shape.

4. A sewage treatment system according to claim 1, characterized in that: The filler balls are arranged at intervals from the mesh weir plate.

5. A sewage treatment system as claimed in claim 1, characterized in that: The eccentric plate is connected to the inner wall of the shell cylinder by welding.

6. A sewage treatment system according to claim 1, characterized in that: The anaerobic biochemical reactor also includes a first water inlet and a first water outlet. The first water inlet is arranged on one side of the bottom of the outer shell cylinder. The first water inlet is connected to a first water inlet pipe. A distributor is arranged at the end of the first water inlet pipe located at the reactor body. The first water outlet is arranged on one side of the top of the outer shell cylinder.

7. A sewage treatment system as claimed in claim 6, characterized in that: The aerobic biochemical reactor comprises a second water inlet and a second water outlet, wherein the second water inlet is arranged on one side of the top of the outer shell cylinder, the second water inlet is connected to a second water inlet pipe, the second water inlet pipe is located at the end of the reactor body and a distributor is arranged; the second water outlet is arranged on one side of the bottom of the outer shell cylinder, the second water outlet is connected to a second water outlet pipe, and the second water outlet pipe is in an inverted U shape.

8. A sewage treatment system as claimed in claim 7, characterized in that: The sedimentation tank comprises a plurality of sedimentation chambers separated by partitions, and each sedimentation chamber is provided with a sludge drain valve.

9. A sewage treatment system as claimed in claim 8, characterized in that: The sedimentation tank is divided into an anaerobic sedimentation tank and an aerobic sedimentation tank, the anaerobic sedimentation tank comprises a first anaerobic sedimentation chamber, a second anaerobic sedimentation chamber, a third anaerobic sedimentation chamber, a fourth anaerobic sedimentation chamber and a fifth anaerobic sedimentation chamber arranged in sequence, the first water outlet is connected to the first anaerobic sedimentation chamber, the fourth anaerobic sedimentation chamber is equipped with a first water pump, and the first water pump is connected to the first water inlet pipe; The aerobic sedimentation tank comprises a first aerobic sedimentation chamber, a second aerobic sedimentation chamber, a third aerobic sedimentation chamber, a fourth aerobic sedimentation chamber and a fifth aerobic sedimentation chamber which are arranged in sequence, the second water outlet pipe is connected to the first aerobic sedimentation chamber, the fourth aerobic sedimentation chamber is equipped with a second water pump, and the second water pump is connected to the second water inlet pipe; The first aerobic settling chamber is disposed after and adjacent to the fifth anaerobic settling chamber.

10. A sewage treatment system according to claim 9, characterized in that: The fifth aerobic sedimentation chamber is equipped with a reflux pump, and the reflux pump is connected to the first anaerobic sedimentation chamber through a reflux pipe.

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