CN210163289U

CN210163289U - Wastewater treatment system

Info

Publication number: CN210163289U
Application number: CN201920574146.5U
Authority: CN
Inventors: 许剑彬; 许福土; 王灵华
Original assignee: Zhejiang Yifeng Marine Biologicals Co Ltd
Current assignee: Zhejiang Yifeng Marine Biologicals Co Ltd
Priority date: 2019-04-25
Filing date: 2019-04-25
Publication date: 2020-03-20
Anticipated expiration: 2029-04-25

Abstract

The utility model relates to the technical field of wastewater treatment, and discloses a wastewater treatment system, which comprises a pre-aeration adjusting tank, an air floatation tank, a denitrification tank, an aerobic tank, a sedimentation tank and a clean water tank, wherein a water inlet is arranged at the position, close to the upper part of the air floatation tank, of the side surface of the pre-aeration adjusting tank, which is far away from the air floatation tank, and a first grid is arranged at the position, communicated with the water inlet, of the pre-aeration adjusting tank; the bottom of the pre-aeration adjusting tank is provided with an aeration device; the pre-aeration adjusting tank is connected with a sewage lifting pump through a first pipeline, and the sewage lifting pump is connected with the air floatation tank through a second pipeline; the denitrification tank is provided with a tank cover and a lower grid; filling materials are filled between the tank cover and the lower grating; the reaction tank is separated from the sedimentation tank by a second filter plate; a baffle plate is welded at a position far away from the second filter plate in the sedimentation tank, and a clean water tank is arranged at one side of the baffle plate far away from the sedimentation tank; a standard discharge port is formed in one side of the clean water tank, which is far away from the reaction tank. The utility model has the advantages of it is following and effect: the denitrification efficiency is high, and the wastewater treatment efficiency is higher.

Description

Wastewater treatment system

Technical Field

The utility model relates to a waste water treatment technical field, in particular to waste water treatment system.

Background

The production of a large amount of factories can be accompanied by producing a large amount of waste water, if the waste water is not treated and recycled, the environmental pollution can be caused, the sustainable development is not facilitated, the water resource waste is caused, and the saving is not facilitated. A typical wastewater treatment system consists of several treatment trains. According to the current pollutant discharge requirements of urban sewage treatment plants in China, a plurality of sewage plants need to execute a first-level A discharge standard, wherein the total nitrogen concentration in discharged water is required to be not higher than 15 mg/L. Under the condition of the prior art, the only feasible method for removing the total nitrogen in the sewage by biological denitrification is provided. According to the conventional biological denitrification theory, the denitrification path generally comprises two stages of nitrification and denitrification. Because of the different reaction conditions, the nitrification and denitrification processes typically need to be carried out in separate aerobic and anoxic reactors.

At present, the Chinese utility model patent with the publication number of CN204803173U discloses a wastewater treatment system, which comprises a denitrification reaction tank, a nitration reaction tank, an anaerobic stirring tank, a biological sedimentation tank and a gas dispersing device.

Above-mentioned technical scheme is through the cell body height through increasing the denitrification reaction tank, has increased the denitrification denitrogenation ability of denitrification reaction tank through deep water pressure, has improved effluent disposal system's sewage treatment ability, nevertheless has following defect: in the nitrification and denitrification reactions, the nitrification and denitrification processes need to be respectively isolated in the aerobic reactor and the anoxic reactor, the denitrification efficiency can be improved by establishing a circulating system, the treatment efficiency of the wastewater is not high, and therefore, a wastewater treatment system with higher wastewater treatment efficiency is urgently needed.

SUMMERY OF THE UTILITY MODEL

To the deficiency that prior art exists, the utility model aims at providing a wastewater treatment system, its treatment effeciency to waste water is higher.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a wastewater treatment system, includes aeration equalizing basin, air supporting pond, reaction tank, sedimentation tank, clean water basin in advance, characterized by: a water inlet is formed in the position, far away from the side surface of the air floatation tank, of the pre-aeration regulating tank and close to the upper part of the pre-aeration regulating tank, and a first grid is arranged at the position, communicated with the water inlet, of the pre-aeration regulating tank; an aeration device is arranged at the bottom of the pre-aeration adjusting tank; the pre-aeration regulating tank is connected with the sewage lifting pump through a first pipeline, and the first pipeline is inserted into the bottom of the pre-aeration regulating tank; the sewage lifting pump is connected with the air floatation tank through a second pipeline, and the second pipeline is inserted into the bottom of the air floatation tank; the reaction tank comprises a first water filter plate, a denitrification tank and an aerobic tank which are separated by the first water filter plate; a tank cover and a lower grid are arranged in the denitrification tank; filling materials are filled between the pool cover and the lower grid; the second filter plate separates the reaction tank from the sedimentation tank; a baffle plate is welded on one side of the sedimentation tank, which is far away from the second filter plate, along the water flow direction, a second water through opening is formed in the position, above the side face of the baffle plate, and a clean water tank is arranged on one side, which is far away from the sedimentation tank, of the baffle plate along the water flow direction; and a standard discharge port is formed in the position, close to the upper part of the clean water tank, of one side, far away from the sedimentation tank, of the clean water tank.

By adopting the technical scheme, the wastewater is converged into the water collecting main pipe, the granular dirt in the wastewater is intercepted and removed by the grid of the pre-aeration regulating reservoir and then flows into the pre-aeration regulating reservoir, and the wastewater is primarily settled and separated by the aeration device at the bottom of the regulating reservoir; the aerated wastewater is lifted to an air floatation tank through a sewage lifting pump, suspended matters entering the air floatation tank can be precipitated by adding and mixing chemicals in a first pipeline and a second pipeline, and the wastewater flows into a reaction tank automatically after being treated; the denitrification tank and the aerobic tank are separated by a filter plate with a three-layer structure, so that the reaction tank is divided into an anoxic zone and an aerobic zone, and the wastewater passing through the denitrification tank can be fully contacted with denitrifying bacteria by filling fillers in the denitrification tank, so that the nitrate nitrogen in the wastewater is efficiently reduced into nitrogen by using organic matters in the wastewater and released into the air, and meanwhile, part of the organic matters can be removed; after the wastewater passes through the filter plate, aerobic matters in the wastewater are subjected to aerobic degradation, and reactions such as BOD removal, nitrification, phosphorus absorption and the like in the aerobic tank are all performed in the aerobic tank; converting ammonia nitrogen in the water into nitrate nitrogen, and performing denitrification reaction on the filler on one side of the aerobic tank close to the denitrification tank to remove the nitrate nitrogen; the wastewater passing through the reaction tank flows into a sedimentation tank, the activated sludge in a suspension state is precipitated, and supernatant passes through a filter tank and a clean water tank and is discharged to a standard discharge port; the baffle is arranged to separate sludge from the supernatant and discharge the supernatant better; the tank cover is arranged on the denitrification tank, so that the growth condition of denitrifying bacteria is ensured, and anaerobic reaction is facilitated.

The utility model is further arranged that a three-phase separator is arranged around the top of the aerobic tank; an exhaust port communicated with a gas phase separation zone at the top of the three-phase separator is arranged at the top of the aerobic tank and is positioned right above the three-phase separator; the top of the side of the aerobic tank along the water flow direction is provided with a water outlet communicated with the sewage clarifying area of the three-phase separator; and a sludge discharge port is arranged at the bottom of the side of the aerobic tank along the water flow direction.

Through adopting above-mentioned technical scheme, erect the three-phase separator at the both sides wall of good oxygen pond perpendicular to rivers direction and the position that is close to its top, carry out solid-liquid-gas separation when the waste water through denitrogenation treatment floats to the three-phase separator, wherein the gas that waste water produced when denitrogenation is discharged via the gas vent at three-phase separator top, mud granule descends to good oxygen bottom of the pool portion at the effect of three-phase separator and is deposiing, and the waste water through handling discharges to the sedimentation tank through the outlet after the three-phase separator is handled.

The utility model is further arranged that the bottom in the denitrification tank is provided with a first perforated aeration pipe; and a second perforated aeration pipe is arranged at the bottom of the aerobic tank.

Through adopting above-mentioned technical scheme, set up the perforation aeration pipe in the pond and be favorable to making muddy water intensive mixing, avoid mud sediment in the denitrification pond bottom.

The utility model is further provided with that the aeration device comprises a blower, a first blast pipe, a second blast pipe, a third blast pipe and an aerator; an aerator is fixed in the pre-aeration adjusting tank at a position close to the bottom of the pre-aeration adjusting tank; the first air supply pipe is communicated with a first vent arranged at the bottom of the pre-aeration adjusting tank, the second air supply pipe is communicated with a second vent arranged at the bottom of the denitrification tank, and the third air supply pipe is communicated with a third vent arranged at the bottom of the aerobic tank; the air blower is connected with the aerator through a first air supply pipe, connected with the first perforated aeration pipe through a second air supply pipe and connected with the second perforated aeration pipe through a third air supply pipe.

Through adopting above-mentioned technical scheme, realize the aeration through first blast pipe, second blast pipe, third blast pipe intercommunication air-blower and aerator and perforation aeration pipe.

The utility model discloses further set up to, the equalizing basin that preamplifies for exposures is connected with the sewage elevator pump through first pipeline, and first pipeline inserts the bottom of equalizing basin that preamplifies for exposures, and the sewage elevator pump passes through the second pipeline to be connected with the air supporting pond, and the second pipeline inserts the bottom in air supporting pond.

Through adopting above-mentioned technical scheme, set up the mud elevator pump and be favorable to in time getting rid of the mud in air supporting pond and the sedimentation tank.

The utility model is further provided that the filler comprises a first porous microorganism carrier, a second porous microorganism carrier and a third porous microorganism carrier; the first filter plate and the second filter plate are of three-layer structures, and the first filter plate comprises a first filter plate grid, a second porous microorganism carrier and a second filter plate grid; the second filter plate comprises a third filter plate grid, a third porous microorganism carrier and a fourth filter plate grid; denitrifying bacteria are cultured on the first porous microbial carrier, the second porous microbial carrier and the third porous microbial carrier.

By adopting the technical scheme, the porous microbial carrier with the denitrifying bacteria is used in the denitrifying tank, so that the contact area between organic matters in the wastewater and the denitrifying bacteria is increased, and the denitrifying reaction in the tank is more sufficient; in addition, two side walls of the aerobic tank along the water flow direction are also arranged to be of a structure with a porous microorganism carrier, so that denitrification reaction of nitrate nitrogen generated by the aerobic tank is facilitated.

The utility model is further provided with a first medicine adding device arranged on the first pipeline and a second medicine adding device arranged on the second pipeline; the first dosing device is internally provided with an inorganic coagulant, and the second dosing device is internally provided with an organic coagulant aid.

By adopting the technical scheme, the chemical adding device is arranged in the connecting pipeline from the pre-aeration adjusting tank to the air flotation tank, and the chemical adding and mixing method through a pipeline is favorable for precipitating suspended matters in the wastewater.

The utility model is further arranged in such a way that the top parts of two side walls of the sedimentation tank along the water flow direction are provided with scraper plate devices, each scraper plate device comprises a chain wheel, a chain meshed with the chain wheel and a scraper welded on the side surface of the chain, and the chains are respectively positioned on the two chain wheels; the two chain wheels are respectively arranged on two side walls of the sedimentation tank along the water flow direction.

Through adopting above-mentioned technical scheme, set up scraper means on the sedimentation tank, drive the scraper blade through sprocket chain meshed mode to get rid of the suspension filth of waste water in the sedimentation tank, guarantee to get into the quality of water in the clear water pond clean.

To sum up, the utility model discloses a beneficial technological effect does:

1. the waste water is converged into a water collecting main pipe, particle dirt in the waste water is intercepted and removed through a grid of a pre-aeration regulating reservoir, and then the waste water flows into the pre-aeration regulating reservoir, and an aeration device at the bottom of the regulating reservoir enables the waste water to be primarily settled and separated; the aerated wastewater is lifted to an air floatation tank through a sewage lifting pump, suspended matters entering the air floatation tank can be precipitated by adding and mixing chemicals in a first pipeline and a second pipeline, and the wastewater flows into a reaction tank automatically after being treated; the denitrification tank and the aerobic tank are separated by a filter plate with a three-layer structure, so that the reaction tank is divided into an anoxic zone and an aerobic zone, and the wastewater passing through the denitrification tank can be fully contacted with denitrifying bacteria by filling fillers in the denitrification tank, so that the nitrate nitrogen in the wastewater is efficiently reduced into nitrogen by using organic matters in the wastewater and released into the air, and meanwhile, part of the organic matters can be removed; after the wastewater passes through the filter plate, aerobic matters in the wastewater are subjected to aerobic degradation, and reactions such as BOD removal, nitrification, phosphorus absorption and the like in the aerobic tank are all performed in the aerobic tank; converting ammonia nitrogen in the water into nitrate nitrogen, and performing denitrification reaction on the filler on one side of the aerobic tank close to the denitrification tank to remove the nitrate nitrogen; the wastewater passing through the reaction tank flows into a sedimentation tank, the activated sludge in a suspension state is precipitated, and supernatant passes through a filter tank and a clean water tank and is discharged to a standard discharge port; the baffle is arranged to separate sludge from the supernatant and discharge the supernatant better;

2. the contact area of organic matters in the wastewater and denitrifying bacteria is increased by using the porous microbial carriers, so that the denitrification reaction in the tank is more sufficient;

3. a tank cover is arranged on the denitrification tank, so that the growth condition of denitrifying bacteria is ensured, and anaerobic reaction is facilitated; the method is characterized in that three-phase separators are erected on two side walls, perpendicular to the water flow direction, of the aerobic tank and close to the top of the aerobic tank, wastewater subjected to denitrification treatment floats to the three-phase separators for solid-liquid-gas separation, gas generated during denitrification of the wastewater is discharged through an exhaust port in the tops of the three-phase separators, sludge particles are settled at the bottoms of the aerobic tank under the action of the three-phase separators for sedimentation, and the treated wastewater is treated by the three-phase separators and then is discharged to the sedimentation tank through a water outlet.

Drawings

FIG. 1 is a schematic view of the overall structure of the embodiment;

FIG. 2 is a schematic view of the structure of a reaction cell of the embodiment;

FIG. 3 is a schematic view of a piping structure of the embodiment;

FIG. 4 is a schematic view of the structure of the sedimentation tank according to the embodiment.

In the figure: 1. a pre-aeration adjusting tank; 11. an aeration device; 111. a blower; 112. a first blast pipe; 113. a second blast pipe; 114. a third blast pipe; 12. a first conduit; 13. a sewage lift pump; 14. a second conduit; 15. a first grid; 16. a water inlet; 17. an aerator; 2. an air floatation tank; 21. a first dosing device; 22. a second dosing device; 3. a reaction tank; 4. a denitrification tank; 41. a pool cover; 42. a first porous microbial carrier; 43. a lower grill 43; 44. a first perforated aerator pipe; 5. an aerobic tank; 51. a first filter plate; 511. a first filter plate grid; 512. a second porous microbial carrier; 513. a second filter plate grid; 52. a second filter plate; 521. a third filter plate grid; 522. a third porous microbial carrier; 523. a fourth filter plate grid; 53. a three-phase separator; 531. an exhaust port; 532. a water outlet; 533. a sludge discharge port; 534. a first vent; 535. a second vent; 536. a third vent; 54. a second perforated aeration pipe; 6. a sedimentation tank; 60. a squeegee assembly; 61. a sprocket; 62. a chain; 63. a squeegee; 7. a clean water tank; 8. a sludge lift pump; 81. a first sludge pipe; 82. a second sludge pipe; 9. marking a row of ports; 91. a first water passage port; 92. a second water vent; 93. and a baffle plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in figure 1, the wastewater treatment system comprises a pre-aeration adjusting tank 1, an air flotation tank 2, a reaction tank 3, a sedimentation tank 6 and a clean water tank 7. The direction from the pre-aeration control tank 1 to the clean water tank 7 is defined as the water flow direction. A water inlet 16 is arranged at the position, close to the upper part of the air floating tank 2, of the side surface, far away from the air floating tank 2, of the pre-aeration adjusting tank 1, a first grid 15 is arranged at the position, communicated with the water inlet 16, of the pre-aeration adjusting tank 1, and an aeration device 11 is arranged at the bottom of the pre-aeration adjusting tank 1. The pre-aeration adjusting tank 1 is connected with a sewage lifting pump 13 through a first pipeline 12, the first pipeline 12 is inserted into the bottom of the pre-aeration adjusting tank 1, the sewage lifting pump 13 is connected with the air floatation tank 2 through a second pipeline 14, and the second pipeline 14 is inserted into the bottom of the air floatation tank 2. A first dosing device 21 is arranged on the first pipeline 12, and a second dosing device 22 is arranged on the second pipeline 14; the first dosing device 21 is internally provided with an inorganic coagulant, and the second dosing device 22 is internally provided with an organic coagulant aid. The air flotation tank 2 is provided with a first water through hole 91 at a position close to the lower part of the side surface of the reaction tank 3. The reaction tank 3 comprises a first water filtering plate 51, a denitrification tank 4 and an aerobic tank 5 which are separated by the first water filtering plate 51. The aerobic tank 5 is separated from the sedimentation tank 6 by a second filter plate 52. A baffle plate 93 is welded on one side of the sedimentation tank 6, which is far away from the second filter plate 52, along the water flow direction, and a second water through opening 92 is formed in the position, above the side surface of the baffle plate 93. On the side of the baffle 93 remote from the settling tank 6 in the direction of water flow is a clean water tank 7.

Referring to fig. 2, a tank cover 41 and a lower grid 4343 are arranged in the denitrification tank 4 and at the bottom of the denitrification tank 4; a first porous microorganism carrier 42 with denitrifying bacteria is filled between the tank cover 41 and the lower grid 43. The bottom of the denitrification tank 4 is provided with a first perforated aeration pipe 44. The first filter plate 51 and the second filter plate 54 are both of a three-layer structure, and the first filter plate 51 comprises a first filter plate grid 511, a second porous microorganism carrier 512 and a second filter plate grid 513; the second filter plate 52 comprises a third filter plate grid 521, a third porous microorganism carrier 522 and a fourth filter plate grid 523; denitrifying bacteria are cultured on the first porous microbial carrier 42, the second porous microbial carrier 512 and the third porous microbial carrier 522. The aerobic tank 5 is vertical to two side walls at two ends of the first filter plate 51, and a three-phase separator 53 is arranged at a position close to the top of the aerobic tank; an exhaust port 531 communicated with a gas phase separation zone at the top of the three-phase separator 53 is arranged at the top of the aerobic tank 5 and right above the three-phase separator 53; the top of the aerobic tank 5 along the water flow direction is provided with a water outlet 532 communicated with the sewage clarifying area of the three-phase separator 53; the side bottom of the aerobic tank 5 along the water flow direction is provided with a sludge discharge hole 533 (as shown in fig. 3). The bottom of the aerobic tank 5 is provided with a second perforated aeration pipe 54.

As shown in fig. 3, the aeration apparatus 11 includes a blower 111, a first air supply pipe 112, a second air supply pipe 113, a third air supply pipe 114, and an aerator 17, and the aerator 17 is fixed to a position near the bottom of the pre-aeration control tank 1. The blower 111 is connected to the aerator 17 through a first air supply pipe 112, the blower 111 is connected to the first perforated aeration pipe 44 through a second air supply pipe 113, and the blower 111 is connected to the second perforated aeration pipe 54 through a third air supply pipe 114. The sludge lift pump 8 is communicated with the bottom in the air floatation tank 2 through a first sludge pipe 81, and the sludge lift pump 8 is communicated with the bottom in the sedimentation tank 6 through a second sludge pipe 82.

As shown in fig. 4, the scraper device 60 is disposed on the top of two side walls of the sedimentation tank 6 along the water flow direction, the scraper device 60 includes two chain wheels 61, one chain 62 respectively disposed on the two chain wheels 61, and scrapers 63 disposed on the side surfaces of the chain 62, and the two chain wheels 61 are respectively disposed on the top of two side walls of the sedimentation tank 6 along the water flow direction. The side surface of the sedimentation tank 6 along the water flow direction is provided with a standard discharge port 9 near the upper end thereof.

When the device is used, the wastewater is converged into the water collecting main pipe, the particles and dirt in the wastewater are intercepted and removed through the grating of the pre-aeration regulating reservoir 1 and then flow into the pre-aeration regulating reservoir 1, and the wastewater is primarily settled and separated through the aeration device 11 at the bottom of the pre-aeration regulating reservoir 1; the aerated wastewater is lifted to the air floatation tank 2 through a sewage lifting pump 13, the suspended matters entering the air floatation tank 2 can be precipitated through adding and mixing chemicals in a first pipeline 12 and a second pipeline 14, and the wastewater flows into the reaction tank 3 automatically after being treated; the denitrification tank 4 and the aerobic tank 5 are separated by a filter plate with a three-layer structure, so that the interior of the reaction tank 3 is divided into an anoxic zone and an aerobic zone, and the wastewater passing through the denitrification tank 4 can be fully contacted with denitrifying bacteria by filling fillers in the denitrification tank 4, so that the nitrate nitrogen in the wastewater is efficiently reduced into nitrogen gas by using organic matters in the wastewater and released into the air, and meanwhile, part of the organic matters can be removed; after the wastewater passes through the first filter plate 51, aerobic matters in the wastewater are subjected to aerobic degradation in the aerobic tank 5, and reactions such as BOD removal, nitrification, phosphorus absorption and the like in the aerobic tank 5 are all performed in the tank; the ammonia nitrogen in the water is converted into nitrate nitrogen, and the nitrate nitrogen in the wastewater is subjected to denitrification reaction due to the fillers arranged in the first filter plate 51 and the second filter plate 52 on the two side walls of the aerobic tank 5 along the water flow direction; the wastewater passing through the reaction tank 3 flows into a sedimentation tank 6, the activated sludge in a suspension state is precipitated, and the supernatant passes through a clean water tank 7 and then is discharged to a standard discharge port 9; the baffle 93 is provided to help separate the sludge from the supernatant for better drainage of the supernatant.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a wastewater treatment system, includes aeration adjusting tank (1), air supporting pond (2), reaction tank (3), sedimentation tank (6), clean water basin (7), characterized by: the direction from the pre-aeration regulating tank (1) to the clean water tank (7) is defined as the water flow direction; a water inlet (16) is formed in the side surface, far away from the air floatation tank (2), of the pre-aeration adjusting tank (1) and close to the position above the pre-aeration adjusting tank (1), and a first grid (15) is arranged at the position, communicated with the water inlet (16), of the pre-aeration adjusting tank (1); an aeration device (11) is arranged at the bottom of the pre-aeration adjusting tank (1); the pre-aeration regulating tank (1) is connected with a sewage lifting pump (13) through a first pipeline (12), and the first pipeline (12) is inserted into the bottom of the pre-aeration regulating tank (1); the sewage lifting pump (13) is connected with the air floatation tank (2) through a second pipeline (14), and the second pipeline (14) is inserted into the bottom of the air floatation tank (2); the reaction tank (3) comprises a first water filtering plate (51), a denitrification tank (4) and an aerobic tank (5) which are separated by the first water filtering plate (51); a tank cover (41) and a lower grid (43) are arranged in the denitrification tank (4); the filling material is filled between the pool cover (41) and the lower grid (43); the second water filtering plate (52) separates the reaction tank (3) from the sedimentation tank (6); a baffle (93) is welded on one side of the sedimentation tank (6) far away from the second water filtering plate (52) along the water flow direction, a second water through opening (92) is formed in the position, above the side face of the baffle (93), and a clean water tank (7) is arranged on one side of the baffle (93) far away from the sedimentation tank (6) along the water flow direction; and a standard discharge port (9) is formed in a position, close to the upper part of the clean water tank (7), on one side, far away from the sedimentation tank (6), of the clean water tank (7).

2. A wastewater treatment system according to claim 1, characterized in that: a three-phase separator (53) is erected around the top of the aerobic tank (5); an exhaust port (531) communicated with a gas phase separation zone at the top of the three-phase separator (53) is arranged at the top of the aerobic tank (5) and right above the three-phase separator (53); the top of the side of the aerobic tank (5) along the water flow direction is provided with a water outlet (532) communicated with the sewage clarifying area of the three-phase separator (53); and a sludge discharge port (533) is formed in the lateral bottom of the aerobic tank (5) along the water flow direction.

3. A wastewater treatment system according to claim 1, characterized in that: a first perforated aeration pipe (44) is arranged at the bottom in the denitrification tank (4); the bottom of the aerobic tank (5) is provided with a second perforated aeration pipe (54).

4. A wastewater treatment system according to claim 1, characterized in that: the aeration device (11) comprises a blower (111), a first air supply pipe (112), a second air supply pipe (113), a third air supply pipe (114) and an aerator (17); an aerator (17) is fixed in the pre-aeration adjusting tank (1) at a position close to the bottom of the pre-aeration adjusting tank; the first blast pipe (112) is communicated with a first vent hole (534) formed in the bottom of the pre-aeration regulating tank (1), the second blast pipe (113) is communicated with a second vent hole (535) formed in the bottom of the denitrification tank (4), and the third blast pipe (114) is communicated with a third vent hole (536) formed in the bottom of the aerobic tank (5); the blower (111) is connected with the aerator (17) through a first air supply pipe (112), the blower (111) is connected with the first perforated aeration pipe (44) through a second air supply pipe (113), and the blower (111) is connected with the second perforated aeration pipe (54) through a third air supply pipe (114).

5. A wastewater treatment system according to claim 1, characterized in that: the pre-aeration adjusting tank (1) is connected with a sewage lifting pump (13) through a first pipeline (12), the first pipeline (12) is inserted into the bottom of the pre-aeration adjusting tank (1), the sewage lifting pump (13) is connected with the air floatation tank (2) through a second pipeline (14), and the second pipeline (14) is inserted into the bottom of the air floatation tank (2).

6. A wastewater treatment system according to claim 1, characterized in that: the filler comprises a first porous microorganism carrier (42), a second porous microorganism carrier (512) and a third porous microorganism carrier (522); the first water filtering plate (51) and the second water filtering plate (52) are of three-layer structures, and the first water filtering plate (51) comprises a first water filtering grid (511), a second porous microorganism carrier (512) and a second water filtering grid (513); the second water filtering plate (52) comprises a third water filtering grid (521), a third porous microorganism carrier (522) and a fourth water filtering grid (523); denitrifying bacteria are cultured on the first porous microbial carrier (42), the second porous microbial carrier (512) and the third porous microbial carrier (522).

7. The wastewater treatment system according to claim 5, wherein: a first dosing device (21) is arranged on the first pipeline (12), and a second dosing device (22) is arranged on the second pipeline (14); an inorganic coagulant is arranged in the first dosing device (21), and an organic coagulant aid is arranged in the second dosing device (22).

8. A wastewater treatment system according to claim 1, characterized in that: scraper devices (60) are arranged at the tops of two side walls of the sedimentation tank (6) along the water flow direction, each scraper device (60) comprises a chain wheel (61), a chain (62) meshed with the chain wheel (61), and scrapers (63) welded on the side faces of the chain (62), and the chains (62) are respectively positioned on the two chain wheels (61); the two chain wheels (61) are respectively arranged on two side walls of the sedimentation tank (6) along the water flow direction.