A sewage treatment system based on nitrification reaction

Abstract

The present invention relates to the technical field of sewage treatment, and in particular to a sewage treatment system based on nitrification reaction, comprising a treatment tank, wherein an aerobic chamber, an anoxic chamber and a sedimentation chamber are arranged in the treatment tank, the bottoms of the aerobic chamber and the anoxic chamber are connected through the sedimentation chamber, a fluid guiding mechanism is further arranged in the treatment tank, a water inlet and an air outlet are arranged at the top of the treatment tank, and a sewage outlet and a water outlet are arranged at the bottom of the treatment tank. In this application example, an aerobic chamber and an anoxic chamber are arranged in the treatment tank, and sedimentation tanks are arranged at the bottoms of the aerobic chamber and the anoxic chamber, and the fluid guiding mechanism is used to guide sewage to circulate in the aerobic chamber and the anoxic chamber, so that sludge can be gathered in the sedimentation chamber and discharged in time through the sewage outlet, thereby solving the problem that sludge in the existing sewage treatment device cannot be discharged in time, resulting in sludge accumulation and affecting nitrification and denitrification reactions, and the sewage treatment efficiency is high.

Description

Technical Field

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

[0002] With the rapid development of industrialization and urbanization, a large amount of sewage is discharged into the environment, posing a serious threat to the ecosystem and human health. Therefore, the research and development and application of sewage treatment technology is particularly important. Among the many sewage treatment technologies, the sewage treatment system based on nitrification reaction has attracted much attention due to its high efficiency, stability and environmental protection.

[0003] When sewage is treated, nitrification and denitrification reactions are usually used to remove nitrogen from sewage, using nitrifying bacteria to oxidize ammonia nitrogen in sewage into nitrate nitrogen. Nitrification consists of two consecutive biochemical reactions. First, under the action of nitrite bacteria, ammonia nitrogen is converted into nitrite nitrogen, and then nitrite nitrogen is further converted into nitrate nitrogen under the action of nitrate bacteria. Subsequently, denitrifying bacteria are used to reduce nitrate nitrogen and nitrite nitrogen in sewage to gaseous nitrogen.

[0004] When the existing sewage treatment equipment is in use, the sewage can pass through the aerobic zone and the anaerobic zone in turn for nitrification and denitrification reactions. However, during the reaction process, the sludge will also be pushed to the inside of the sludge collection tank by the push plate, and the sludge cannot be removed in time. The sludge continues to accumulate in the reaction tank, which will occupy the effective sewage treatment space and reduce the efficiency of sewage treatment. As the amount of sludge increases, the degree of mixing between sewage and sludge will increase, which may interfere with the nitrification and denitrification reactions. At the same time, the sludge may contain a large number of aging or dead microorganisms, which will reduce the overall biological activity and affect the nitrification and denitrification reactions. Summary of the invention

[0005] In view of the above problems, a sewage treatment system based on nitrification reaction is provided. By arranging an aerobic chamber and an anoxic chamber in the treatment tank, and arranging a sedimentation tank at the bottom of the aerobic chamber and the anoxic chamber, when the fluid guiding mechanism guides the sewage to circulate in the aerobic chamber and the anoxic chamber, the sludge can be gathered in the sedimentation chamber and discharged to the outside through the sewage outlet, thereby solving the problem that the sludge in the existing sewage treatment system cannot be discharged in time, which will cause sludge accumulation and affect nitrification and denitrification reactions.

[0006] In order to solve the problems of the prior art, the present invention provides a sewage treatment system based on nitrification reaction, comprising a treatment tank, wherein an aerobic chamber and an anoxic chamber are arranged in the treatment tank, and a sedimentation chamber is located at the bottom of the aerobic chamber and the anoxic chamber, the bottoms of the aerobic chamber and the anoxic chamber are connected through the sedimentation chamber, and the treatment tank is also provided with a fluid guiding mechanism capable of guiding the sewage to circulate between the anoxic chamber and the aerobic chamber, a water inlet capable of communicating with the anoxic chamber and an air outlet are arranged at the top of the treatment tank, a sewage outlet capable of discharging sludge and a water outlet capable of discharging treated sewage are arranged at the bottom of the treatment tank, and the sewage undergoes a nitrification reaction in the aerobic chamber and then a denitrification reaction in the anoxic chamber.

[0007] Preferably, an aeration tube is provided in the aerobic chamber.

[0008] Preferably, a separation cylinder is provided in the treatment tank, an anoxic chamber is formed inside the separation cylinder, an aerobic chamber is formed between the outer circumferential surface of the separation cylinder and the inner wall of the treatment tank, and a sedimentation chamber is formed at the bottom of the separation cylinder.

[0009] Preferably, the treatment tank is provided with a stirring shaft extending into the anoxic chamber, and a driving machine for driving the stirring shaft to rotate, and a stirring rod is provided on the stirring shaft.

[0010] Preferably, the fluid guiding mechanism includes a water pump pan coaxially slidably arranged in the separation cylinder, the circumferential surface of the water pump pan is sealed with the inner wall of the separation cylinder, a one-way valve body is arranged on the water pump pan, the stirring shaft is transmission-connected to the water pump pan, and when the stirring shaft rotates, the water pump pan rises and falls back and forth in the longitudinal direction in the separation cylinder.

[0011] Preferably, the water pump disc is elastically slidably connected to the stirring shaft, the top of the water pump disc is provided with bosses distributed along its circumference, grooves are provided between adjacent bosses, and a positioning pin that can abut against the top of the water pump disc is provided on the stirring shaft.

[0012] Preferably, a positioning platform located at the bottom of the water pump tray is provided on the stirring shaft, and an elastic element is provided between the water pump tray and the positioning platform.

[0013] Preferably, the water pump tray is located at the bottom of the stirring bar.

[0014] Preferably, the bottom end of the treatment tank is provided with a conical block elastically abutting against the sewage outlet, the bottom end of the stirring shaft slides with the conical block, the stirring shaft is provided with a coaxial spiral blade with holes, and the threaded blade with holes is located in the sewage outlet.

[0015] Preferably, a pressure regulating assembly for regulating the elastic force of the conical block on the sewage outlet is provided at the bottom of the sewage outlet.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present application example arranges an aerobic chamber and an anoxic chamber in a treatment tank, and provides sedimentation tanks at the bottom of the aerobic chamber and the anoxic chamber, and utilizes a fluid guiding mechanism to guide sewage to circulate in the aerobic chamber and the anoxic chamber, so that sludge can be gathered in the sedimentation chamber and discharged in time through the sewage outlet, thereby solving the problem that sludge in the existing sewage treatment device cannot be discharged in time, resulting in sludge accumulation and affecting nitrification and denitrification reactions, and the sewage treatment efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of a sewage treatment system based on nitrification reaction.

[0019] Figure 2 It is a three-dimensional cross-sectional view of a sewage treatment system based on nitrification reaction.

[0020] Figure 3 It is a cross-sectional view of a sewage treatment system based on nitrification reaction.

[0021] Figure 4 yes Figure 3 A partial enlarged view of point A.

[0022] Figure 5 yes Figure 3 A partial enlarged view of point B.

[0023] Figure 6 It is a schematic diagram of the internal structure of a sewage treatment system based on nitrification reaction.

[0024] Figure 7 It is a three-dimensional diagram of a pump water pan in a separator cylinder in a sewage treatment system based on nitrification reaction.

[0025] Figure 8 It is a schematic diagram of a sewage treatment system based on nitrification reaction when the pump water pan is at a high position.

[0026] Fig. 9 It is a schematic diagram of a sewage treatment system based on nitrification reaction with the pump water pan at a low position.

[0027] Fig.10 It is a three-dimensional diagram of a pressure regulating component in a wastewater treatment system based on nitrification reaction.

[0028] The numbers in the figure are: 1. treatment tank; 11. aerobic chamber; 12. anoxic chamber; 13. sedimentation chamber; 14. water inlet; 15. sewage outlet; 16. exhaust port; 17. water outlet; 2. fluid guiding mechanism; 21. pump water disc; 211. one-way valve body; 212. boss; 213. groove; 22. elastic element; 23. bellows; 31. aeration pipe; 32. separation cylinder; 33. conical drainage cylinder; 34. stirring shaft; 341. stirring rod; 342. positioning pin; 343. positioning platform; 35. driving machine; 41. conical block; 42. spiral blade with hole; 51. hanging plate; 52. connecting column; 53. auxiliary spring; 54. adjusting nut; 55. adjusting spring. DETAILED DESCRIPTION

[0029] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, this application provides:

[0031] A sewage treatment system based on nitrification reaction comprises a treatment tank 1, wherein an aerobic chamber 11 and an anoxic chamber 12 are arranged in the treatment tank 1, and a sedimentation chamber 13 is located at the bottom of the aerobic chamber 11 and the anoxic chamber 12, the bottoms of the aerobic chamber 11 and the anoxic chamber 12 are connected through the sedimentation chamber 13, the treatment tank 1 is further provided with a fluid guiding mechanism 2 capable of guiding sewage to circulate between the anoxic chamber 12 and the aerobic chamber 11, the top of the treatment tank 1 is provided with a water inlet 14 capable of communicating with the anoxic chamber 12, and an air outlet, the bottom of the treatment tank 1 is provided with a sewage outlet 15 capable of discharging sludge, and a water outlet 17 capable of discharging treated sewage, the sewage undergoes a nitrification reaction in the aerobic chamber 11 and then undergoes a denitrification reaction in the anoxic chamber 12.

[0032] When in use, sewage is introduced into the anoxic chamber 12 through the water inlet 14, and the sewage flows through the anoxic chamber 12, the sedimentation chamber 13 and the aerobic chamber 11. Ammonia nitrogen in the sewage is converted into nitrate and nitrite under the action of nitrifying bacteria in the aerobic chamber 11, and nitrification reaction is carried out. The sewage containing nitrate and nitrite is called nitrification liquid, which flows back into the anoxic chamber 12 under the action of the fluid guiding mechanism 2, and is finally converted into nitrogen gas under the action of denitrifying bacteria in the anoxic chamber 12, and discharged through the gas outlet to carry out denitrification reaction.

[0033] The order of nitrification and denitrification reactions is opposite to the flow direction of sewage in the aerobic chamber 11 and the anoxic chamber 12. This is because the denitrification process needs to be carried out under anoxic conditions and requires an organic carbon source as an electron donor to complete the denitrification process. If the nitrification reaction is in the front, that is, the aerobic process is in the front, the organic carbon source (that is, the organic matter COD in the wastewater) is basically removed by the aerobic process. In the absence of an organic carbon source in the anoxic chamber 12, denitrification cannot occur. Therefore, the anoxic chamber 12 is in the front, and denitrification is carried out by reflowing the sewage of the aerobic chamber 11.

[0034] Nitrification is the oxidation of ammonia nitrogen into nitrate under aerobic conditions, and denitrification can only be completed under anaerobic conditions without molecular oxygen but with nitrate oxygen and when there is organic matter to provide carbon energy for denitrifying bacteria.

[0035] After a period of reaction, the treated sewage can be discharged from the water outlet 17 by opening the water outlet 17, so that the nitrification treatment of the sewage can be continuously performed.

[0036] In this embodiment, an aerobic chamber 11 and an anoxic chamber 12 are arranged in the treatment tank 1, and sedimentation tanks are provided at the bottom of the aerobic chamber 11 and the anoxic chamber 12. The fluid guiding mechanism 2 is used to guide the sewage to circulate in the aerobic chamber 11 and the anoxic chamber 12, so that the sludge can be gathered in the sedimentation chamber 13 and discharged in time through the sewage outlet 15, thereby solving the problem that the sludge in the existing sewage treatment device cannot be discharged in time, resulting in sludge accumulation and affecting nitrification and denitrification reactions, and the sewage treatment efficiency is high.

[0037] like Figure 2 and Figure 6 As shown, an aeration pipe 31 is provided in the aerobic chamber 11 .

[0038] The aeration tube 31 is provided in the aerobic chamber 11 to increase the dissolved oxygen content of the water in the aerobic chamber 11, improve the oxidation efficiency of the water and the removal effect of organic matter, and at the same time increase the mixing effect of the water, improve the hydraulic environment, promote the growth and metabolic activity of nitrifying bacteria, accelerate the degradation and removal of organic matter, increase the dissolved oxygen saturation of the water, and maintain the ecological balance of the water.

[0039] like Figure 3 As shown, 3. A sewage treatment system based on nitrification reaction according to claim 1 or 2 is characterized in that a separation cylinder 32 is provided in the treatment tank 1, an anoxic chamber 12 is formed inside the separation cylinder 32, an aerobic chamber 11 is formed between the outer circumferential surface of the separation cylinder 32 and the inner wall of the treatment tank 1, and a sedimentation chamber 13 is formed at the bottom of the separation cylinder 32.

[0040] A conical drainage tube 33 with an inner diameter that gradually decreases downward is provided at the top of the inner cavity of the treatment tank 1. The lower port of the conical drainage tube 33 is located at the top of the separation tube 32. The diameter of the lower port of the conical drainage tube 33 is smaller than the inner diameter of the separation tube 32. The water inlet 14 is connected to the inner cavity of the conical drainage tube 33. When sewage is injected into the water inlet 14, the sewage flows into the separation tube 32 under the action of the inner wall of the conical drainage tube 33, so that the sewage can pass through the anoxic chamber 12, the sedimentation chamber 13 and the aerobic chamber 11 in turn, and circulate among the anoxic chamber 12, the sedimentation chamber 13 and the aerobic chamber 11.

[0041] The top end and the bottom end of the separation cylinder 32 are respectively arranged in the processing tank 1 through a bracket.

[0042] like Figure 3 and Figure 4 As shown, the treatment tank 1 is provided with a stirring shaft 34 extending into the anoxic chamber 12 , and a driving machine 35 for driving the stirring shaft 34 to rotate, and a stirring rod 341 is provided on the stirring shaft 34 .

[0043] The driving machine 35 can drive the stirring shaft 34 to rotate in the anoxic chamber 12, and then the stirring rod 341 can rotate in the anoxic chamber 12, so that the raw sludge in the sewage just entering the anoxic chamber 12 can be evenly contacted with the cooked sludge in the anoxic chamber 12, accelerate heat conduction, evenly supply nutrients to nitrifying bacteria, break up the scum layer on the liquid surface of the anoxic chamber 12, and make the sludge in the entire anoxic chamber 12 roll up and down and be in an active digestion state.

[0044] like Figure 7 , Figure 8 and Fig. 9 As shown, the fluid guiding mechanism 2 includes a water pump pan 21 coaxially slidably arranged in the separation cylinder 32, the circumferential surface of the water pump pan 21 is sealed with the inner wall of the separation cylinder 32, a one-way valve body 211 is arranged on the water pump pan 21, and the stirring shaft 34 is transmission-connected with the water pump pan 21. When the stirring shaft 34 rotates, the water pump pan 21 moves back and forth in the longitudinal direction in the separation cylinder 32.

[0045] In order to allow the sewage to circulate back and forth in the anoxic chamber 12, the sedimentation chamber 13 and the aerobic chamber 11, when the stirring shaft 34 rotates, the pump water disc 21 can be lifted and lowered in the longitudinal direction in the separation cylinder 32, and a one-way valve body 211 is provided on the pump water disc 21, so that when the pump water disc 21 descends, the sewage at the bottom thereof can be squeezed downward, and then the sewage in the separation cylinder 32 can be squeezed into the sedimentation tank, and the sedimentation tank is connected with the aerobic chamber 11, the liquid level of the aerobic chamber 11 rises, and the top of the aerobic chamber 11 is connected with the top of the anoxic chamber 12, so that the sewage in the aerobic chamber 11 can flow back into the anoxic chamber 12, and when the pump water disc 21 rises, the water bodies at the top and bottom of the pump water disc 21 are connected because the one-way valve body 211 moves upward, so that when the pump water disc 21 is lifted and lowered, the sewage can circulate back and forth in the anoxic chamber 12, the sedimentation chamber 13 and the aerobic chamber 11.

[0046] like Figure 8 and Fig. 9 As shown, the water pump disc 21 is elastically slidably connected to the stirring shaft 34 , the top of the water pump disc 21 is provided with bosses 212 distributed along its circumference, grooves 213 are provided between adjacent bosses 212 , and a positioning pin 342 that can abut against the top of the water pump disc 21 is provided on the stirring shaft 34 .

[0047] The circumferential surface of the water pump pan 21 is provided with convex strips, and the inner wall of the separation cylinder 32 is provided with a slide groove extending in the longitudinal direction. The boss 212 is slidably matched with the slide groove to prevent the water pump pan 21 from rotating in the separation cylinder 32.

[0048] The stirring shaft 34 drives the positioning pin 342 to rotate, and the top end of the water pump disc 21 elastically abuts against the positioning pin 342. When the positioning pin 342 slides from the groove 213 to the boss 212, the water pump disc 21 overcomes the elastic force and moves downward. When the positioning pin 342 slides from the boss 212 to the groove 213, the water pump disc 21 moves upward under the action of the elastic force, so that when the stirring shaft 34 rotates, the water pump disc 21 can move back and forth in the longitudinal direction, thereby guiding the sewage to reciprocate and circulate in the anoxic chamber 12, the sedimentation chamber 13 and the aerobic chamber 11.

[0049] like Figure 7 As shown, a positioning platform 343 located at the bottom of the water pump tray 21 is provided on the stirring shaft 34 , and an elastic element 22 is provided between the water pump tray 21 and the positioning platform 343 .

[0050] A bellows sleeve 23 is further provided between the pump water tray 21 and the positioning platform 343 , and the elastic element 22 is located in the bellows sleeve 23 to prevent the elastic element 22 from being corroded by sewage.

[0051] The pump tray 21 can be guided to reciprocate on the positioning platform 343 by the elastic element 22 , and the pump tray 21 can be guided to reciprocate by the elastic element 22 .

[0052] like Figure 4 As shown, the water pump tray 21 is located at the bottom of the stirring bar 341 .

[0053] The stirring bar 341 is located on the top of the water pump tray 21 to prevent the rotating stirring bar 341 from disturbing the sludge in the sedimentation tank.

[0054] like Figure 5 and Fig.10 As shown, the bottom end of the treatment tank 1 is provided with a conical block 41 elastically abutting against the sewage outlet 15, the bottom end of the stirring shaft 34 is a sliding tube conical block 41, and the stirring shaft 34 is provided with a coaxial spiral blade 42 with a hole, and the threaded blade with a hole is located in the sewage outlet 15.

[0055] When the stirring shaft 34 drives the perforated spiral blade 42 to rotate in the sewage outlet 15, the rotating perforated stirring blade can gather the sludge in the sewage outlet 15. When the force exerted by the gathered sludge on the conical block 41 is greater than the abutment force of the conical block 41 on the sewage outlet 15, the conical block 41 separates from the sewage outlet 15, and a sewage discharge gap is formed between the conical block 41 and the sewage outlet 15, so that the sludge can be discharged outward from the sewage discharge gap.

[0056] like Figure 5 and Fig.10 As shown, a pressure regulating assembly for regulating the elastic force of the conical block 41 on the sewage outlet 15 is provided at the bottom of the sewage outlet 15 .

[0057] The pressure regulating assembly includes a suspension plate 51 arranged at the bottom of the sewage outlet 15, the suspension plate 51 and the sewage outlet 15 are connected by a connecting column 52, the connecting column 52 slides through the conical block 41, an auxiliary spring 53 is sleeved on the connecting column 52, the auxiliary spring 53 is located between the conical block 41 and the suspension plate 51, the bottom end of the stirring shaft 34 passes through the suspension plate 51 and is rotatably connected thereto, an adjusting nut 54 threadedly connected thereto is provided on the stirring shaft 34, the adjusting nut 54 is located between the conical block 41 and the suspension plate 51, and an adjusting spring 55 is also sleeved on the stirring shaft 34, the adjusting spring 55 is located between the conical block 41 and the adjusting nut 54.

[0058] When it is necessary to adjust the elastic force of the conical block 41 on the sewage outlet 15, the adjusting nut 54 is rotated relative to the stirring shaft 34 to adjust the distance between the adjusting nut 54 and the conical block 41, so as to adjust the compression amount of the adjusting nut 54, thereby adjusting the elastic force of the conical block 41 on the sewage outlet 15, so as to adjust the water content of the sludge. When the pressure of the conical block 41 on the sewage outlet 15 is greater, the water content of the sludge is lower.

[0059] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A sewage treatment system based on nitrification reaction, comprising a treatment tank (1), characterized in that: The treatment tank (1) is provided with an aerobic chamber (11) and an anoxic chamber (12), and a sedimentation chamber (13) located at the bottom of the aerobic chamber (11) and the anoxic chamber (12); the bottoms of the aerobic chamber (11) and the anoxic chamber (12) are connected via the sedimentation chamber (13); the treatment tank (1) is also provided with a fluid guiding mechanism (2) capable of guiding sewage to circulate between the anoxic chamber (12) and the aerobic chamber (11); the top of the treatment tank (1) is provided with a water inlet (14) capable of communicating with the anoxic chamber (12), and an air outlet; the bottom of the treatment tank (1) is provided with a sewage outlet (15) capable of discharging sludge, and a water outlet (17) capable of discharging treated sewage; the sewage undergoes a nitrification reaction in the aerobic chamber (11) and then a denitrification reaction in the anoxic chamber (12); A pressure regulating component for regulating the elastic force of the conical block (41) on the sewage outlet (15) is provided at the bottom of the sewage outlet (15); The treatment tank (1) is provided with a stirring shaft (34) extending into the anoxic chamber (12), and a driving machine (35) for driving the stirring shaft (34) to rotate, and a stirring rod (341) is provided on the stirring shaft (34); The pressure regulating assembly comprises a suspension plate (51) arranged at the bottom of the sewage outlet (15); the suspension plate (51) and the sewage outlet (15) are connected via a connecting column (52); the connecting column (52) slides through the conical block (41); an auxiliary spring (53) is sleeved on the connecting column (52); the auxiliary spring (53) is located between the conical block (41) and the suspension plate (51); the bottom end of the stirring shaft (34) penetrates the suspension plate (51) and is rotatably connected thereto; an adjusting nut (54) threadedly connected thereto is arranged on the stirring shaft (34); the adjusting nut (54) is located between the conical block (41) and the suspension plate (51); an adjusting spring (55) is sleeved on the stirring shaft (34); the adjusting spring (55) is located between the conical block (41) and the adjusting nut (54); When it is necessary to adjust the elastic force of the conical block (41) on the sewage outlet (15), the adjusting nut (54) is rotated relative to the stirring shaft (34) to adjust the distance between the adjusting nut (54) and the conical block (41), thereby adjusting the compression amount of the adjusting nut (54), thereby adjusting the elastic force of the conical block (41) on the sewage outlet (15), thereby adjusting the water content of the sludge. When the pressure of the conical block (41) on the sewage outlet (15) is greater, the water content of the sludge is lower; A separation cylinder (32) is provided in the treatment tank (1); an anoxic chamber (12) is formed inside the separation cylinder (32); an aerobic chamber (11) is formed between the outer circumferential surface of the separation cylinder (32) and the inner wall of the treatment tank (1); and a sedimentation chamber (13) is formed at the bottom of the separation cylinder (32); The fluid guiding mechanism (2) comprises a water pump disc (21) coaxially slidably arranged in a separation cylinder (32), the circumferential surface of the water pump disc (21) being sealingly matched with the inner wall of the separation cylinder (32), a one-way valve body (211) being arranged on the water pump disc (21), and a stirring shaft (34) being drivingly connected to the water pump disc (21), and when the stirring shaft (34) rotates, the water pump disc (21) is lifted and lowered reciprocatingly in the longitudinal direction in the separation cylinder (32); In order to allow the sewage to circulate back and forth in the anoxic chamber (12), the sedimentation chamber (13) and the aerobic chamber (11), when the stirring shaft (34) rotates, the pumping disc (21) can be lifted and lowered in the longitudinal direction in the separation cylinder (32), and a one-way valve body (211) is provided on the pumping disc (21), so that when the pumping disc (21) descends, the sewage at the bottom thereof can be squeezed downward, thereby squeezing the sewage in the separation cylinder (32) into the sedimentation tank, and the sedimentation tank is connected to the aerobic chamber (11). When the pumping tray (21) rises, the liquid level of the aerobic chamber (11) rises, and the top of the aerobic chamber (11) is connected to the top of the anoxic chamber (12), so that the sewage in the aerobic chamber (11) can flow back into the anoxic chamber (12); when the pumping tray (21) rises, the water bodies at the top and bottom of the pumping tray (21) are connected due to the upward movement of the one-way valve body (211), so that when the pumping tray (21) is reciprocated and raised, the sewage can reciprocate and circulate in the anoxic chamber (12), the sedimentation chamber (13) and the aerobic chamber (11); The water pump disc (21) is elastically slidably connected to the stirring shaft (34); the top of the water pump disc (21) is provided with bosses (212) distributed along its circumference; grooves (213) are provided between adjacent bosses (212); and the stirring shaft (34) is provided with a positioning pin (342) capable of abutting against the top of the water pump disc (21); The stirring shaft (34) drives the positioning pin (342) to rotate, and the top end of the water pump disc (21) elastically abuts against the positioning pin (342). When the positioning pin (342) slides from the groove (213) to the boss (212), the water pump disc (21) overcomes the elastic force and moves downward. When the positioning pin (342) slides from the boss (212) to the groove (213), the water pump disc (21) moves upward under the action of the elastic force, so that when the stirring shaft (34) rotates, the water pump disc (21) can reciprocate in the longitudinal direction, thereby guiding the sewage to reciprocate and circulate in the anoxic chamber (12), the sedimentation chamber (13) and the aerobic chamber (11); A positioning platform (343) located at the bottom of the water pump tray (21) is provided on the stirring shaft (34), and an elastic element (22) is provided between the water pump tray (21) and the positioning platform (343); The water pump tray (21) is located at the bottom of the stirring bar (341); The bottom end of the treatment tank (1) is provided with a conical block (41) elastically abutting against the sewage outlet (15), the bottom end of the stirring shaft (34) slides on the conical block (41), and the stirring shaft (34) is provided with a coaxial spiral blade (42) with a hole, and the spiral blade with a hole is located in the sewage outlet (15).

2. A sewage treatment system based on nitrification reaction according to claim 1, characterized in that: An aeration pipe (31) is provided in the aerobic chamber (11).

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