CN105110560A - Zero-discharge dyeing wastewater treatment system - Google Patents

Abstract

The invention relates to a zero-discharge printing and dyeing wastewater treatment system, including a wastewater regulating tank, a coagulation sedimentation tank, an advanced oxidation sedimentation tank, an inverted ^A2O reaction tank, an aerobic contact oxidation tank, a secondary sedimentation tank, a sand filter tank and a clear water tank ; The coagulation sedimentation tank includes a stirring mixing area and a sedimentation area; the advanced oxidation sedimentation tank includes an aeration mixing area and a sedimentation area, and the inverted A ² O reaction tank includes a facultative section, anoxic section and anaerobic section separated by baffles section; the aerobic contact oxidation tank is equipped with water inlet pipes, water distribution triangle cones, fillers and aeration control system; the wastewater is adjusted by the adjustment tank to adjust the water volume and water quality, and then enters the coagulation sedimentation tank to remove pollutants, and then the wastewater enters the advanced oxidation sedimentation tank. Pollutants are oxidized and decomposed, and then enter the inverted A ² O reaction tank, aerobic contact oxidation tank for anoxic, anaerobic and aerobic reactions, and enter the clear water tank for reuse after sedimentation and filtration.

Description

A zero discharge printing and dyeing wastewater treatment system

technical field

The invention relates to the technical field of wastewater treatment, in particular to a zero-discharge printing and dyeing wastewater treatment system.

Background technique

my country's textile industry has a large volume and a wide area, and the wastewater produced is large in quantity and high in concentration. It is one of the industrial pollution sources that pose a serious threat to water environmental pollution. Among textile industry wastewater, printing and dyeing wastewater is the most polluted. With the development of science and technology, the variety of dyes is increasing, and the composition of dyes is becoming more and more complex, and has the characteristics of anti-oxidation, anti-photolysis, high chroma, and high concentration. Higher and higher requirements are put forward for the treatment technology and process of printing and dyeing wastewater. Require.

The treatment technologies of printing and dyeing wastewater mainly include chemical method, mass transfer method, heat treatment method and biological method. Printing and dyeing wastewater has complex components and poor biochemical properties. It is difficult to achieve ideal treatment results with a single method. Physical, chemical, biological and other comprehensive methods are usually used for comprehensive treatment, but this brings problems such as high treatment costs.

With the continuous improvement of environmental protection requirements and the increasing shortage of resources, the reasonable recovery and secondary utilization of water resources and non-renewable resources have become an important part of environmental governance.

Contents of the invention

The technical problem to be solved by the present invention is: in order to solve the above-mentioned sewage treatment problem, the present invention provides a zero-discharge printing and dyeing wastewater treatment system to realize the recycling of wastewater resources.

The technical solution adopted by the present invention to solve the technical problem is: a zero-discharge printing and dyeing wastewater treatment system, including wastewater regulating tank, coagulation sedimentation tank, advanced oxidation sedimentation tank, inverted ^A2O reaction tank, aerobic contact oxidation tank, Secondary settling tank, sand filter and clear water tank; said wastewater regulating tank, coagulation sedimentation tank, advanced oxidation sedimentation tank, inverted ^A2O reaction tank, aerobic contact oxidation tank, secondary settling tank, sand filter and clear water tank sequentially connected.

The wastewater regulating pond includes a water inlet pipe and a water outlet pipe for regulating the water quality and water quantity of the printing and dyeing wastewater.

The coagulation-sedimentation tank includes a stirring and mixing zone and a sedimentation zone, the bottom of the stirring and mixing zone is provided with a waste water inlet pipe, the middle and upper part is provided with a coagulant adding system, and a stirring device is provided in the middle of the stirring and mixing zone; A baffle is provided, and the baffle and the inner wall of the coagulation-sedimentation tank form a waste water flow channel for the waste water to enter the sedimentation area. A three-phase separator is installed at the outlet of the sedimentation area, and an overflow weir is arranged on the upper part of the outlet of the sedimentation area. Designed as a conical structure, a sediment discharge valve is installed at the bottom of the sedimentation area.

The water outlet pipe of the coagulation sedimentation tank communicates with the water inlet pipe of the advanced oxidation sedimentation tank.

The advanced oxidation sedimentation tank includes an aeration mixing zone and a sedimentation zone, an ozone aeration pan is arranged at the bottom of the aeration mixing zone, and a water distribution branch pipe is arranged above the ozone aeration disk, and the water distribution branch pipe is connected to The water inlet pipe, the ozone aeration plate is connected with the fan outside the advanced oxidation sedimentation tank through the aeration pipe, and the fan is connected to the ozone generator through the pipeline; a baffle plate is provided in the described sedimentation area, and the baffle plate is connected with the inner wall of the sedimentation tank Form a waste water flow channel that enters the sedimentation area as waste water. A three-phase separator is installed at the outlet of the sedimentation area. An overflow weir is installed on the upper part of the outlet of the sedimentation area. .

The inverted A ² O reaction tank includes a baffle plate that is divided into a partoxic section, an anoxic section and an anaerobic section. The head end of the anoxic section is connected, and the end of the anoxic section is connected with the head end of the anaerobic section. The lower part of the baffle plate on the water inlet side of the anoxic section and the anaerobic section is provided with a 45-degree corner to avoid the impact generated when the water flow enters The effect of buffering water flow and uniform water distribution; the end of the anaerobic section is equipped with a three-phase separator and overflow weir, and the overflow weir is connected to the outlet pipe; the bottom of the anaerobic section, anoxic section and anaerobic section is designed as a cone shaped structure, the conical structure is connected to the sludge discharge valve; the upper cover of the facultative section, anoxic section and anaerobic section of the inverted A ² O reaction tank is designed as a conical structure, and the top of the conical structure is equipped with independent methane Exhaust gas collecting pipe; fillers are provided in the facultative, anoxic and anaerobic sections.

The middle and lower part of the aerobic contact oxidation tank is provided with a water inlet pipe, and the lower part of the water inlet pipe is provided with a water distribution triangle cone; the lower part of the water distribution triangle cone is provided with an aeration control system, and the aeration control system includes an aeration plate , a blower and a dissolved oxygen measuring and controlling device; further, the aeration pan is a microporous aeration pan with micropores uniformly arranged therein. The aeration pan is connected to a blower through an aeration pipe, and the blower is arranged outside the aerobic contact oxidation tank, and a dissolved oxygen measurement and control device is installed on the upper part of the aerobic contact oxidation tank and under the wastewater surface, and the dissolved oxygen measurement and control device is based on the oxygen capacity. The work of the blower is regulated; the upper part of the water inlet pipe is built with filler; the outlet of the aerobic contact oxidation tank is arranged with an overflow weir.

The outlet pipe of the aerobic contact oxidation tank is connected to the secondary settling tank, and a sludge return system is installed at the bottom of the secondary settling tank, and a part of the sludge returns to the inverted A ² O reaction tank.

The water after sedimentation treatment in the secondary sedimentation tank enters the sand filter tank through the overflow weir, and the filtered water enters the clear water tank for reuse.

A method for wastewater treatment using the above-mentioned zero-discharge printing and dyeing wastewater treatment system has the following steps:

① Printing and dyeing wastewater enters the wastewater regulating tank through the water inlet pipe to adjust the water quality and quantity.

②Wastewater enters the coagulation-sedimentation tank through the wastewater inlet pipe at the bottom of the mixing zone of the coagulation-settling tank, mixes with the coagulant from the coagulant addition system, and stirs with the stirring device set in the middle of the mixing zone; after the coagulation reaction The wastewater enters the sedimentation area, and the three-phase separator in the sedimentation area realizes the separation of mud and water; the sludge sinks to the lower part of the sedimentation area of the coagulation sedimentation tank under the action of gravity, and is discharged through the sediment discharge valve at the bottom; the wastewater passes through the overflow weir, The outlet pipe and connecting pipe enter the water inlet pipe of the advanced oxidation sedimentation tank.

③Wastewater enters the middle and lower part of the advanced oxidation sedimentation tank through the water inlet pipe and water distribution branch pipe of the advanced oxidation sedimentation tank; the ozone aeration plate located under the water distribution branch pipe of the advanced oxidation sedimentation tank produces a large number of fine bubbles to further rub the solids in the wastewater, At the same time, the macromolecular substances in the wastewater are oxidized into small molecular substances that are easy to absorb and absorb. The oxidized and decomposed wastewater enters the wastewater flow channel in the sedimentation area, and the three-phase separator in the sedimentation area realizes the separation of mud and water; the sludge is under the action of gravity. It sinks to the lower part of the sedimentation area of the advanced oxidation sedimentation tank and is discharged through the mud discharge valve at the bottom; the waste water is connected to the inlet pipe of the inverted A2O reaction tank through the overflow weir, outlet pipe and connecting pipe.

④Wastewater enters the lower part of the inverted A ² O reaction pool through the inlet pipe of the aerobic section of the inverted A ² O reaction pool; after entering the inverted A ² O reaction pool, the waste water moves up and down along the baffle, and passes through the aerobic section and the anoxic section in turn and the sludge bed in each reaction chamber of the anaerobic section, the sludge in the reaction tank moves with the up and down flow of wastewater and the rise of biogas, and the blocking effect of the baffle plate and the sedimentation of the sludge itself make the sludge The flow rate of mud is reduced, so a large amount of sludge is trapped in the reaction tank, and the microorganisms in the reaction tank are in full contact with the organic matter in the wastewater. The facultative bacteria in the facultative stage, the heterotrophic bacteria in the anoxic stage and the anaerobic stage hydrolyze the suspended pollutants such as starch, fiber, carbohydrates and soluble organic matter in the wastewater into organic acids, and decompose the macromolecular organic matter into small molecular organic matter , Insoluble organic matter is converted into soluble organic matter.

⑤The waste water after the anaerobic reaction is separated from mud, water and methane by the three-phase separator at the end of the anaerobic section, and the sludge sinks to the lower part of the inverted A ² O reaction pool under the action of gravity The sludge is discharged through the sludge discharge valve at the bottom; the methane waste gas generated by the inverted A ² O reaction tank is collected and discharged through the gas collection pipe on the top of the reaction tank; the treated wastewater is connected to the aerobic contact oxidation tank through the overflow weir, outlet pipe and connecting pipe. inlet pipe.

⑥Wastewater enters the middle and lower part of the aerobic contact oxidation tank through the water inlet pipe, and the water is evenly distributed under the action of the water distribution triangle cone. Micro-bubbles, the dissolved oxygen measurement and control device regulates the work of the blower according to the oxygen capacity to ensure that the dissolved oxygen in the aerobic contact oxidation pool water is greater than 2mg/L, and the treated wastewater flows out through the overflow weir and the outlet pipe.

⑦ The outlet pipe of the aerobic contact oxidation tank is connected to the water distribution pipe of the secondary settling tank, and part of the sedimentation sludge in the secondary settling tank is returned to the inverted A ² O reaction tank, and part of it is used as excess sludge.

⑧The water after sedimentation treatment in the secondary sedimentation tank enters the sand filter tank through the overflow weir, and the filtered water enters the clear water tank for reuse.

⑨The sediment and excess sludge produced in coagulation sedimentation tank, advanced oxidation sedimentation tank, inverted A ² O reaction tank and secondary sedimentation tank are dehydrated and transported outside.

The beneficial effects of the present invention are: the present invention has simple structure, low manufacturing cost, relatively good depth effect on printing and dyeing wastewater treatment, and convenient management.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a schematic structural view of a coagulation sedimentation tank according to an embodiment of the present invention.

In Fig. 1: 1. coagulation sedimentation tank, 1-1. stirring mixing zone, 1-2. coagulation sedimentation tank sedimentation zone, 1-3. waste water inlet pipe, 1-4. coagulant addition system, 1- 5. Stirring device, 1-6. Coagulation sedimentation tank baffle, 1-7. Three-phase separator, 1-8. Overflow weir, 1-9. Sediment discharge valve.

Fig. 2 is a schematic structural view of an advanced oxidation sedimentation tank according to an embodiment of the present invention.

In Figure 2: 2. Advanced oxidation sedimentation tank, 2-1. Aeration mixing zone, 2-2. Sedimentation zone, 2-3. Ozone aeration pan, 2-4. Water distribution branch pipe, 2-5. Water inlet pipe , 2-6. Ozone blower and gas flow meter, 2-7. Ozone generator, 2-8. Baffle, 2-9. Three-phase separator for advanced oxidation sedimentation tank, 2-10. Overflow weir for advanced oxidation sedimentation tank , 2-11. Mud discharge valve.

Fig. 3 is a schematic structural diagram of an inverted A ² O reaction cell according to an embodiment of the present invention.

In Fig. 3: 3. Inverted A ² O reaction tank, 3-1. Baffle plate, 3-2. Concurrent oxygen section, 3-3. Anoxic section, 3-4. Anaerobic section, 3-5. Inversion A ² O reaction tank inlet pipe, 3-6. Inverted A ² O reaction tank three-phase separator, 3-7. Inverted A ² O reaction tank overflow weir, 3-8. Sludge discharge valve, 3-9. Cover, 3-10. Air collection pipe, 3-11. Packing.

Fig. 4 is a schematic structural diagram of an aerobic contact oxidation tank according to an embodiment of the present invention.

In Figure 4: 4. Aerobic contact oxidation tank, 4-1. Aerobic contact oxidation tank inlet pipe, 4-2. Water distribution triangle cone, 4-3. Aeration control system, 4-4. Aerobic contact oxidation Pool Filling, 4-5. Aerobic Contact Oxidation Pool Overflow Weir.

Fig. 5 is a process flow diagram of an embodiment of the present invention.

Detailed ways

The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

Example

As shown in Figures 1 to 5, a zero-discharge printing and dyeing wastewater treatment system of the present invention includes a wastewater regulating tank, a coagulation sedimentation tank 1, an advanced oxidation sedimentation tank ² , an inverted A2O reaction tank 3, and an aerobic contact oxidation tank 4. Secondary settling tank, sand filter tank and clear water tank; the wastewater regulating tank, coagulation sedimentation tank 1, advanced oxidation sedimentation tank ² , inverted A2O reaction tank 3, aerobic contact oxidation tank 4, secondary settling tank, The sand filter tank and the clear water tank are connected in sequence.

The wastewater regulating pond includes a water inlet pipe and a water outlet pipe for regulating the water quality and water quantity of the printing and dyeing wastewater.

The coagulation-sedimentation tank 1 includes a stirring and mixing zone 1-1 and a settling zone 1-2. The bottom of the stirring and mixing zone is provided with a waste water inlet pipe 1-3, and the middle and upper part is provided with a coagulant adding system 1-4. The middle part of the mixing zone is provided with a stirring device 1-5; the settling zone is provided with a baffle plate 1-6, and the baffle plate and the inner wall of the settling tank form a waste water channel for the waste water to enter the settling zone; The phase separator 1-7 is provided with an overflow weir 1-8 at the upper part of the outlet of the sedimentation area, and the bottom of the sedimentation area is designed as a conical structure, and a sediment discharge valve 1-9 is arranged at the bottom of the sedimentation area.

The outlet pipe of the coagulation sedimentation tank 1 communicates with the water inlet pipe 2-5 of the advanced oxidation sedimentation tank 2 .

The advanced oxidation sedimentation tank 2 includes an aeration mixing zone 2-1 and a sedimentation zone 2-2, an ozone aeration pan 2-3 is arranged at the bottom of the aeration mixing zone, and a cloth is arranged above the ozone aeration pan. The water branch pipe 2-4, the water distribution branch pipe 2-4 is connected to the water inlet pipe 2-5, the ozone aeration plate 2-3 is connected to the fan outside the advanced oxidation sedimentation tank through the aeration pipe, and the fan is connected through the pipeline Ozone generator 2-7; Described settling area is provided with baffle plate 2-8, and this baffle plate and the inner wall of settling tank form the waste water channel that enters settling area as waste water, and the outlet of settling area is provided with three-phase separator 2 -9, an overflow weir 2-10 is provided on the upper part of the outlet of the sedimentation area, and the bottom of the sedimentation area is designed as a conical structure, and a mud discharge valve 2-11 is arranged at the bottom of the sedimentation area.

The inverted A ² O reaction tank 3 includes an aerobic section 3-2, an anoxic section 3-3 and an anaerobic section 3-4 separated by a baffle plate 3-1, and the aerobic section 3-2 starts with The end is provided with an inlet pipe 3-5 for feeding waste water, the end of the anoxic section 3-2 is connected to the head end of the anoxic section 3-3, and the end of the anoxic section 3-3 is connected to the head end of the anaerobic section 3-4. The lower part of the baffle plate on the inlet side of the anoxic section 3-3 and the anaerobic section 3-4 is provided with a 45-degree corner to avoid the impact of the water flow when it enters, thereby buffering the water flow and evenly distributing the water The role of; anaerobic section 3-4 end is provided with three-phase separator 3-6 and overflow weir 3-7, and overflow weir 3-7 connects outlet pipe; Described part-aerobic section 3-2, anoxic section 3-3 and The bottom of the anaerobic section 3-4 is designed as a conical structure, and the conical structure is connected to the sludge discharge valve 3-8 ^; the upper cover 3- 9 is designed as a conical structure, and the top of the conical structure is provided with an independent methane waste gas collection pipe 3-10; the aerobic section, the anoxic section and the anaerobic section are all provided with fillers 3-11.

The middle and lower part of the aerobic contact oxidation tank 4 is provided with a water inlet pipe 4-1, and the lower part of the water inlet pipe 4-1 is provided with a water distribution triangle cone 4-2; the lower part of the water distribution triangle cone 4-2 is provided with an exposure Gas control system 4-3, the aeration control system 4-3 includes an aeration pan, a blower and a dissolved oxygen measurement and control device; further, the aeration pan is a microporous aeration pan with micropores evenly arranged . The aeration pan is connected to a blower through an aeration pipe, and the blower is arranged outside the aerobic contact oxidation tank, and a dissolved oxygen measurement and control device is installed on the upper part of the aerobic contact oxidation tank and under the wastewater surface, and the dissolved oxygen measurement and control device is based on the oxygen capacity. The work of the air blower is regulated; the upper part of the water inlet pipe is provided with filler 4-4; the outlet of the aerobic contact oxidation tank is provided with an overflow weir 4-5.

The outlet pipe of the aerobic contact oxidation tank 4 is connected to the secondary settling tank, and a sludge return system is installed at the bottom of the secondary settling tank, part of the sludge returns to the inverted A2O reaction tank ³ , and part of it is excess sludge.

The water after sedimentation treatment in the secondary sedimentation tank enters the sand filter tank through the overflow weir, and the filtered water enters the clear water tank for reuse.

A method for wastewater treatment using the above-mentioned zero-discharge printing and dyeing wastewater treatment system has the following steps:

① Printing and dyeing wastewater enters the wastewater regulating tank through the water inlet pipe to adjust the water quality and quantity.

②Wastewater enters the coagulation-sedimentation tank 1 through the wastewater inlet pipe 1-3 at the bottom of the stirring and mixing zone of the coagulation-settling tank, and mixes with the coagulant from the coagulant addition system 1-4, using the stirring device set in the middle of the stirring zone 1-5 for stirring; the wastewater after the coagulation reaction enters the sedimentation zone 1-2, and the three-phase separator 1-7 in the sedimentation zone realizes the separation of mud and water; the sludge sinks to the coagulation sedimentation tank sedimentation zone 1 under the action of gravity The lower part of -2 is discharged through the sediment discharge valve 1-9 at the bottom; the waste water enters the water inlet pipe 2-5 of the advanced oxidation sedimentation tank through the overflow weir 1-8, the outlet pipe and the connecting pipe.

③Wastewater enters the middle and lower part of the advanced oxidation sedimentation tank 2 through the water inlet pipe 2-5 and the water distribution branch pipe 2-4 of the advanced oxidation sedimentation tank; the ozone aeration plate 2-3 located below the water distribution branch pipe of the advanced oxidation sedimentation tank produces a large number of fine air bubbles The solid matter in the wastewater is further rubbed, and at the same time, the macromolecular substances in the wastewater are oxidized into small molecular substances that are easy to absorb and absorb. The oxidized and decomposed wastewater enters the wastewater flow channel in the sedimentation area, and the three-phase separator in the sedimentation area 2- 9 Realize the separation of mud and water; the sludge sinks to the lower part of the advanced oxidation sedimentation tank sedimentation area 2-2 under the action of gravity, and is discharged through the sludge discharge valve 2-11 at the bottom; the waste water passes through the overflow weir 2-10, the outlet pipe and the connecting The pipes are connected to the water inlet pipes 3-5 of the inverted A ² O reaction pool.

④The waste water enters the lower part of the inverted A ² O reaction pool 3 through the water inlet pipe 3-5 of the aerobic section of the inverted A ² O reaction pool ^; 3-2. The sludge bed in each reaction chamber of anoxic section 3-3 and anaerobic section 3-4. The sludge in the reaction tank moves with the up and down flow of wastewater and the rise of biogas. The baffle plate The blocking effect of the sludge and the sedimentation of the sludge itself reduce the flow rate of the sludge, so a large amount of sludge is trapped in the reaction tank, and the microorganisms in the reaction tank fully contact with the organic matter in the wastewater. Facultative bacteria in facultative section 3-2, heterotrophic bacteria in anoxic section 3-3 and anaerobic section 3-4 hydrolyze suspended pollutants such as starch, fiber, carbohydrates and soluble organic matter in wastewater into organic acids, Decompose macromolecular organic matter into small molecular organic matter, and convert insoluble organic matter into soluble organic matter.

⑤ After the anaerobic reaction, the three-phase separator 3-6 installed at the end of the anaerobic section 3-4 realizes the separation of mud, water and methane gas, and the sludge sinks under the action of gravity to the inverted A ² O reaction In the lower part of the tank, the excess sludge is discharged through the sludge discharge valve 3-8 at the bottom; the methane waste gas generated by the inverted A ² O reaction tank is collected and discharged through the gas collection pipe 3-10 at the top of the reaction tank; the waste water is discharged through the overflow weir, outlet pipe and The connecting pipe is connected with the water inlet pipe 4-1 of the aerobic contact oxidation tank.

⑥Waste water enters the middle and lower part of the aerobic contact oxidation tank 4 through the water inlet pipe 4-1, and the water is evenly distributed under the action of the water distribution triangle 4-2. The measuring and controlling device regulates the operation of the blower according to the oxygen capacity to ensure that the dissolved oxygen in the aerobic contact oxidation pool water is greater than 2 mg/L, and the treated waste water flows out through the overflow weir 4-5 and the outlet pipe.

⑦ The outlet pipe of the aerobic contact oxidation tank is connected to the water distribution pipe of the secondary settling tank, and part of the sedimentation sludge in the secondary settling tank flows back into the inverted A ² O reaction tank 3, and part of it is used as excess sludge.

⑧The water after sedimentation treatment in the secondary sedimentation tank enters the sand filter tank through the overflow weir, and the filtered water enters the clear water tank for reuse.

⑨Coagulation sedimentation tank 1, advanced oxidation sedimentation tank 2, inverted A ² O reaction tank 3, aerobic contact oxidation tank 4 and secondary sedimentation tank produce sediment and excess sludge after dehydration and transport outside.

Inspired by the above-mentioned ideal embodiment according to the present invention, through the above-mentioned description content, relevant workers can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, but must be determined according to the scope of the claims.

Claims (1)

1. a zero release printing and dyeing wastewater treatment system, is characterized in that: comprise wastewater equalization pond, coagulative precipitation tank (1), advanced oxidation settling tank (2), inversion A ²o reaction tank (3), aerobic contact oxidation pond (4), second pond, sand filter and clean water basin;

Described wastewater equalization pond comprises water inlet pipe and rising pipe, for regulating water quality and the water yield of dyeing waste water;

Described coagulative precipitation tank (1) comprises and is uniformly mixed district (1-1) and settling region (1-2), be uniformly mixed bottom district and be provided with wastewater inlet pipe (1-3), middle and upper part is provided with coagulating agent add-on system (1-4), is provided with whipping appts (1-5) being uniformly mixed in the middle part of district; Baffle plate (1-6) is provided with in described settling region, the inwall of this baffle plate and coagulative precipitation tank forms the waste water runner entering settling region as waste water, the exit of settling region is provided with triphase separator (1-7), the outlet top of settling region is provided with overfalling weir (1-8), the tapered structure of settling region bottom design, is provided with sediment discharge valve (1-9) bottom settling region;

Described advanced oxidation settling tank (2) comprises aeration mixing zone (2-1) and settling region (2-2), ozonation aerated dish (2-3) is provided with bottom aeration mixing zone, the top of described ozonation aerated dish is provided with water distribution branch pipe (2-4), described water distribution branch pipe (2-4) connects water inlet pipe (2-5), described ozonation aerated dish (2-3) is connected with the blower fan outside advanced oxidation settling tank by aeration tube, blower and pipeline is communicated with ozonizer (2-7); Baffle plate (2-8) is provided with in described settling region, the inwall of this baffle plate and settling tank forms the waste water runner entering settling region as waste water, the exit of settling region is provided with triphase separator (2-9), the outlet top of settling region is provided with overfalling weir (2-10), the tapered structure of settling region bottom design, is provided with mud valve (2-11) bottom settling region;

Described inversion A ²o reaction tank (3) comprise be separated into by traverse baffle (3-1) double oxygen section (3-2), anoxic section (3-3) and anaerobism section (3-4), described double oxygen section (3-2) head end is provided with the water inlet pipe (3-5) for feeding waste water, oxygen section (3-2) end of holding concurrently is communicated with anoxic section (3-3) head end, and anoxic section (3-3) end is communicated with anaerobism section (3-4) head end; The bottom of the water inlet side traverse baffle of described anoxic section (3-3) and anaerobism section (3-4) is provided with the corner of 45 degree, the shock action produced when entering to avoid current, thus the effect playing buffering current and water distribution uniformity; Anaerobism section (3-4) end is provided with triphase separator (3-6) and overfalling weir (3-7), and overfalling weir (3-7) connects rising pipe; Described double oxygen section (3-2), anoxic section (3-3) and the tapered structure of anaerobism section (3-4) bottom design, pyramidal structure connects mud discharging valve (3-8); Described inversion A ²the upper cover (3-9) of the double oxygen section of O reaction tank, anoxic section and anaerobism section is designed to conical structure, and conical structure top is all provided with methane waste product effuser (3-10); Filler (3-11) is all provided with in described double oxygen section, anoxic section and anaerobism section;

The interior middle and lower part of described aerobic contact oxidation pond (4) arranges water inlet pipe (4-1), and described water inlet pipe (4-1) bottom is provided with water distribution pyrometric cone (4-2); Described water distribution pyrometric cone (4-2) bottom is provided with aeration regulator control system (4-3), and described aeration regulator control system (4-3) comprises aeration plate, gas blower and dissolved oxygen sensing regulation device; Further, described aeration plate is the pore type aeration plate being evenly provided with micropore; Described aeration plate connects gas blower by aeration tube, gas blower is arranged on outside aerobic contact oxidation pond, top, the waste water underwater in aerobic contact oxidation pond arrange dissolved oxygen sensing regulation device, and described dissolved oxygen sensing regulation device is according to the work of oxygen capacity regulation and control gas blower; Described water inlet pipe top is built-in with filler (4-4); The exit in described aerobic contact oxidation pond is laid with overflow weir (4-5);

The rising pipe of described aerobic contact oxidation pond (4) connects second pond, and be provided with sludge recirculation system bottom second pond, a part of sludge reflux is to inversion A ²in O reaction tank (3);

Water after sedimentation in secondary sedimentation tank process enters sand filter through overflow weir, and the water after filtration enters clean water basin reuse.