CN105036485A - Refuse leachate treatment system - Google Patents

Abstract

The invention relates to a landfill leachate treatment system, which includes a waste water regulating tank, a coagulation sedimentation tank, a packing type anoxic anaerobic reaction tank, an electrolytic tank, an aerobic contact oxidation tank and a sand filter tank; the coagulation sedimentation tank includes a mixing and stirring area and sedimentation area, the bottom of the mixing area is equipped with a waste water inlet pipe, the middle and upper part is equipped with a chemical solution adding system for adding coagulant, and a stirring device is installed in the middle of the mixing area; the packed anoxic anaerobic reaction tank includes facultative section, anoxic section, and anaerobic section; the electrolytic cell is provided with a water inlet pipe and an outlet pipe, and the electrolytic cell has a structure of two chambers on the left and right, which are the positive electrode chamber and the negative electrode chamber; The lower part of the triangular cone for water distribution is equipped with an aeration control system. The aeration control system includes an aeration pan, a blower and a dissolved oxygen measurement and control device.

Description

A landfill leachate treatment system

technical field

The invention relates to the technical field of waste water treatment, in particular to a landfill leachate treatment system.

Background technique

With the rapid development of the economy and the improvement of people's living standards, there are more and more garbage, which produces a large amount of landfill leachate. Landfill leachate is highly toxic and contains a variety of organic matter, high concentrations of ammonia nitrogen, inorganic salts, heavy metals and many other pollutants, and its water quality varies greatly. Improper treatment will pose a threat to surrounding soil, surface water, groundwater and human health.

Biochemical treatment of landfill leachate has the advantages of good treatment effect and low cost. It is currently a widely used wastewater treatment method. However, for landfill leachate with low biodegradability and high toxicity, the effect of biochemical treatment is often not ideal.

The combination technology of electric biofilter overcomes the shortcomings of single biological method such as low biodegradability and strong toxicity. Electrolytic oxidation is an advanced oxidation technology that can effectively degrade complex organic matter. It uses the anode to directly catalyze the degradation of pollutants, or electrolysis to generate strong oxidants to indirectly degrade pollutants. During the electrochemical oxidation process, no chemical reagents are consumed, and secondary pollution is small, which can significantly Improve biodegradability of landfill leachate.

Contents of the invention

The technical problem to be solved by the present invention is: in order to solve the problem of landfill leachate treatment, the present invention proposes a landfill leachate treatment system.

The technical solution adopted by the present invention to solve the technical problem is: a landfill leachate treatment system, including a wastewater regulating tank, a coagulation sedimentation tank, a packing type anoxic anaerobic reaction tank, an electrolytic tank, an aerobic contact oxidation tank and sand filter tank; the wastewater regulating tank, coagulation sedimentation tank, packed anoxic anaerobic reaction tank, electrolytic tank, aerobic contact oxidation tank and sand filter tank are connected in sequence.

The wastewater regulating tank includes a water inlet pipe and a water outlet pipe for regulating the water quality and water quantity of landfill leachate.

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

The packing type anoxic anaerobic reaction tank includes a participatory section, anoxic section and anaerobic section separated by baffles, the head end of the participatory section is provided with an inlet pipe for feeding waste water, and the partaerobic section The end is connected with the head end of the anoxic section, 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 inlet side of the anoxic section and the anaerobic section is provided with a 45-degree corner to avoid water flow when entering. The impact of the impact effect, so as to play the role 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 Conical 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 packed anoxic anaerobic reaction tank is designed as a conical structure, and the top of the conical structure is set There is an independent methane waste gas collection pipe; fillers are provided in the facultative, anoxic and anaerobic sections.

The electrolytic cell is provided with a water inlet pipe and a water outlet pipe, and the water inlet pipe is connected to the outlet pipe of the packing type anoxic anaerobic reaction tank; the electrolytic cell is a left and right two-chamber structure, which are respectively a positive electrode chamber and a negative electrode chamber, and the positive electrode The middle and lower parts of the chamber and the negative chamber are connected, and the upper part is separated by a partition. The positive chamber and the negative chamber are respectively provided with two positive and negative electrode plates, and the positive and negative two electrode plates are respectively connected to the external positive and negative power supplies; The upper part is a conical structure, and the top of the conical structure is equipped with a gas collector; further, a ruthenium-iridium-titanium electrode or a ruthenium-iridium-titanium-tin electrode or an iridium-tantalum-titanium electrode or an iridium-tantalum-titanium-tin electrode is used as the positive electrode material, and the titanium electrode is used as the negative electrode Materials; the outlet of the electrolytic cell is provided with a three-phase separator, the upper part of the outlet is provided with an overflow weir, and the overflow weir is connected to the outlet pipe; the outlet pipe of the electrolytic cell is connected to the inlet pipe of the aerobic contact oxidation tank.

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 measurement and control device; further, the aeration pan is a microporous aeration pan with micropores evenly arranged thereon, and the aeration pan is connected to the blower through an aeration tube, and the blower is arranged at the aerobic contact oxidation Outside the pool, a dissolved oxygen measurement and control device is installed on the upper part of the aerobic contact oxidation tank and under the water surface of the wastewater. The dissolved oxygen measurement and control device regulates the work of the blower according to the oxygen capacity; the upper part of the water inlet pipe is filled with fillers; the aerobic contact oxidation An overflow weir is arranged at the water outlet of the pool.

The outlet pipe of the aerobic contact oxidation tank is connected to a sand filter tank, and the treated water is filtered and discharged up to standard.

A method for wastewater treatment using the landfill leachate treatment system has the following steps:

①The landfill leachate enters the wastewater regulating tank through the water inlet pipe to adjust the water quality and quantity.

②The adjusted water enters the coagulation-sedimentation tank through the water inlet pipe at the bottom of the mixing zone of the coagulation-settling tank, and mixes with the coagulant from the liquid medicine adding system, and is stirred by the stirring device set in the middle of the mixing zone. After mixing The waste water enters the sedimentation area, and the three-phase separator in the sedimentation area realizes the separation of mud and water.

③The water after coagulation and sedimentation enters the lower part of the packed anoxic anaerobic reaction tank through the inlet pipe of the aerobic section of the packed anoxic anaerobic reaction tank; the waste water enters the packed anoxic anaerobic reaction tank and goes up and down along the baffle Go forward and pass through the sludge bed of each reaction chamber in the facultative, anoxic and anaerobic stages in turn. The sludge in the reaction tank moves with the up and down flow of wastewater and the rise of biogas, and the blocking of the baffle The action 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. The facultative bacteria in the facultative stage, the heterotrophic bacteria in the anoxic stage and the anaerobic stage decompose the macromolecular organic matter in the wastewater into small molecular organic matter, and convert the insoluble organic matter into soluble organic matter.

④ After the anaerobic reaction, the three-phase separator installed at the end of the anaerobic section realizes the separation of mud, water and methane gas. The sludge sinks to the lower part of the anaerobic section under the action of gravity, and the excess sludge passes through the bottom The sludge discharge valve discharges. The methane gas produced by the packed anoxic anaerobic reaction tank is collected and discharged through the gas collecting pipe at the top of the reaction tank; the waste water enters the electrolytic cell through the overflow weir, outlet pipe and connecting pipe.

⑤Wastewater from the packed anoxic anaerobic reaction tank enters the electrolytic cell, and the pollutants in the wastewater are electrolyzed. During the electrolysis process, the gas generated by the positive and negative electrodes is collected, separated and dried, and then reused; the wastewater after electrolytic treatment enters through the outlet pipe Aerobic contact oxidation pond.

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.

⑦The outlet pipe of the aerobic contact oxidation tank is connected to the water distribution pipe of the sand filter tank, and the filtered water is discharged up to the standard.

⑧ The sludge produced in the coagulation sedimentation tank and the packed anoxic anaerobic reaction tank is dehydrated and transported abroad.

The beneficial effects of the present invention are: the present invention has simple structure, low manufacturing cost, very good treatment effect on landfill leachate treatment, and high operating efficiency.

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. Mixing and stirring zone, 1-2. Sedimentation zone, 1-3. Waste water inlet pipe, 1-4. Medicinal solution adding system, 1-5. Stirring device, 1-6. Baffle plate, 1-7. Coagulation-sedimentation tank three-phase separator, 1-8. Coagulation-settling tank overflow weir, 1-9. Coagulation-settling tank sediment discharge valve.

Fig. 2 is a schematic structural diagram of a packed anoxic anaerobic reaction tank according to an embodiment of the present invention.

In Fig. 2: 2. Packing type anoxic anaerobic reaction tank, 2-1. Baffle plate, 2-2. Concurrent oxygen section, 2-3. Anoxic section, 2-4. Anaerobic section, 2-5 . Filling type anoxic anaerobic reaction tank inlet pipe, 2-6. Packing type anoxic anaerobic reaction tank three-phase separator, 2-7. Packing type anoxic anaerobic reaction tank overflow weir, 2-8. Sludge Drain valve, 2-9. upper cover, 2-10. air collecting pipe, 2-11. filler.

Fig. 3 (a) is a cross-sectional schematic view of the electrolytic cell of the embodiment of the present invention, and Fig. 3 (b) is a longitudinal sectional schematic view of the electrolytic cell of the embodiment of the present invention.

Among Fig. 3 (a), Fig. 3 (b): 3. electrolytic cell, 3-1. electrolytic cell inlet pipe, 3-2. electrolytic cell outlet pipe, 3-3. positive electrode chamber, 3-4. negative electrode chamber, 3-5. Separator, 3-6. Positive plate, 3-7. Negative plate, 3-8. Gas collector, 3-9. Three-phase separator for electrolytic cell, 3-10. Overflow weir for electrolytic cell.

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. Filler, 4- 5. Aerobic contact oxidation tank 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.

As shown in Figures 1 to 5, a landfill leachate treatment system according to the present invention includes a wastewater regulating tank, a coagulation sedimentation tank 1, a packed anoxic anaerobic reaction tank 2, an electrolytic tank 3, and an aerobic contact oxidation tank 4 and a sand filter; the wastewater regulating tank, the coagulation sedimentation tank 1, the packed anoxic anaerobic reaction tank 2, the electrolytic tank 3, the aerobic contact oxidation tank 4 and the sand filter are connected in sequence.

The wastewater regulating tank includes a water inlet pipe and a water outlet pipe for regulating the water quality and water quantity of landfill leachate.

The coagulation-sedimentation tank 1 includes a mixing zone 1-1 and a sedimentation zone 1-2, the bottom of the mixing zone is provided with a waste water inlet pipe 1-3, and the middle and upper part is provided with a liquid medicine adding system 1-4, and in the mixing zone The middle part is provided with stirring device 1-5; said settling area is provided with baffle plate 1-6, 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 coagulation Settling tank three-phase separator 1-7, the upper part of the outlet of the settling area is provided with a coagulation settling tank overflow weir 1-8, the bottom of the settling area is designed as a conical structure, and a coagulation settling tank sediment discharge valve is set at the bottom of the settling area 1-9.

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

Described electrolytic cell 3 is provided with water inlet pipe 3-1 and water outlet pipe 3-2, and water inlet pipe 3-1 communicates with the outlet pipe of packing type anoxic anaerobic reaction pool; Described electrolytic cell 3 is left and right two chamber structures, Respectively positive electrode chamber 3-3 and negative electrode chamber 3-4, the middle and lower parts of the positive electrode chamber 3-3 and negative electrode chamber 3-4 are connected, the upper part is separated by a separator 3-5, and the positive electrode chamber 3-3 is provided with a positive electrode Plate 3-6, negative electrode chamber 3-4 is provided with negative electrode plate 3-7, positive and negative two electrode plates are respectively connected to external positive and negative power supply, the upper part of positive electrode chamber and negative electrode chamber is conical structure, and the top of conical structure is all set There are gas collectors 3-8; further, a ruthenium-iridium-titanium electrode or a ruthenium-iridium-titanium-tin electrode or an iridium-tantalum-titanium electrode or an iridium-tantalum-titanium-tin electrode is used as the positive plate material, and a titanium electrode is used as the negative plate material; the wastewater electrolytic cell A three-phase separator 3-9 is arranged at the outlet of the outlet, and an overflow weir 3-10 is arranged on the upper part of the outlet.

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 a sand filter tank, and the treated water is filtered and discharged up to standard.

A method for wastewater treatment using the landfill leachate treatment system has the following steps:

①The landfill leachate enters the wastewater regulating tank through the water inlet pipe to adjust the water quality and quantity.

②The adjusted water enters the coagulation sedimentation tank 1 through the water inlet pipe 1-3 at the bottom of the mixing zone 1-1 of the coagulation sedimentation tank, mixes with the coagulant from the liquid medicine addition system 1-4, and is set in the mixing zone by using The stirring device 1-5 in the middle is stirring, and the mixed wastewater enters the sedimentation zone 1-2, and the three-phase separator 1-7 in the sedimentation zone realizes the separation of mud and water.

③The waste water after coagulation and sedimentation enters the lower part of the packing type anoxic anaerobic reaction pool 2 through the inlet pipe 2-5 of the aerobic section of the packing type anoxic anaerobic reaction pool; The baffle 2-1 advances up and down, and passes through the sludge bed of each reaction chamber of the facultative section 2-2, the anoxic section 2-3 and the anaerobic section 2-4 in turn, and the sludge in the reaction pool is discharged along with the waste water. The up and down flow of the biogas and the movement of the biogas rise, the blocking effect of the baffle plate 2-1 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 reaction tank The microorganisms in the wastewater are in full contact with the organic matter in the wastewater; the facultative bacteria in the facultative stage 2-2, the heterotrophic bacteria in the anoxic stage 2-3 and the anaerobic stage 2-4 decompose the macromolecular organic matter in the wastewater into small molecules Organic matter, insoluble organic matter is converted into soluble organic matter.

④ The waste water after the anaerobic reaction is separated from mud, water and methane by the three-phase separator 2-6 provided at the end of the anaerobic section 2-4, and the sludge sinks to the lower part of the anaerobic section under the action of gravity. Excess sludge is discharged through the sludge discharge valve 2-8 at the bottom; waste gas such as methane generated by the packed anoxic anaerobic reaction tank is collected and discharged through the gas collecting pipe 2-10 at the top of the reaction tank; waste water is discharged through the overflow weir 2-7, Water pipes and connecting pipes enter the electrolytic cell.

⑤Wastewater from the packing type anoxic anaerobic reaction tank enters the electrolytic cell 3 through the water inlet pipe 3-1, the pollutants in the wastewater are electrolyzed, and the gas generated by the positive and negative electrodes in the electrolysis process is collected, separated and dried, and reused; electrolytic treatment The final wastewater enters the aerobic contact oxidation tank through the outlet pipe.

⑥Wastewater 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 aeration tray generates a large number of microbubbles, and 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 passes through the overflow weir 4-5 And the outlet pipe flows out.

⑦ The outlet pipe of the aerobic contact oxidation tank 4 is connected to the water distribution pipe of the sand filter, and the filtered water is discharged up to the standard.

⑧ The sludge produced in the coagulation sedimentation tank 1 and the packed anoxic anaerobic reaction tank 2 is dehydrated and transported abroad.

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 garbage percolation liquid treating system, is characterized in that: comprise wastewater equalization pond, coagulative precipitation tank (1), material filling type anoxic anaerobic reation pool (2), electrolyzer (3), aerobic contact oxidation pond (4) and sand filter;

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

Described coagulative precipitation tank (1) comprises mix and blend district (1-1) and settling region (1-2), wastewater inlet pipe (1-3) is provided with bottom mix and blend district, middle and upper part, mix and blend district is provided with liquid add-on system (1-4), is provided with whipping appts (1-5) in the middle part of stirring area; Baffle plate (1-6) 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 (1-7), the outlet top of settling region is provided with coagulative precipitation tank overfalling weir (1-8), the tapered structure of settling region bottom design, is provided with coagulative precipitation tank sediment discharge valve (1-9) bottom settling region;

Described material filling type anoxic anaerobic reation pool (2) comprise be separated into by traverse baffle (2-1) double oxygen section (2-2), anoxic section (2-3) and anaerobism section (2-4), described double oxygen section (2-2) head end is provided with the water inlet pipe (2-5) for feeding waste water, oxygen section (2-2) end of holding concurrently is communicated with anoxic section (2-3) head end, and anoxic section (2-3) end is communicated with anaerobism section (2-4) head end; The bottom of the water inlet side traverse baffle of described anoxic section (2-3) and anaerobism section (2-4) 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 (2-4) end is provided with triphase separator (2-6) and overfalling weir (2-7), and overfalling weir (2-7) connects rising pipe; Described double oxygen section (2-2), anoxic section (2-3) and the tapered structure of anaerobism section (2-4) bottom design, pyramidal structure connects mud discharging valve (2-8); The upper cover (2-9) of the double oxygen section of described material filling type anoxic anaerobic reation pool, anoxic section and anaerobism section is designed to conical structure, and conical structure top is all provided with methane waste product effuser (2-10); Filler (2-11) is all provided with in described double oxygen section, anoxic section and anaerobism section;

Described electrolyzer (3) is provided with water inlet pipe (3-1) and rising pipe (3-2), and water inlet pipe (3-1) is communicated with the rising pipe of material filling type anoxic anaerobic reation pool; Described electrolyzer (3) is left and right two cell structure, be respectively cathode chamber (3-3) and anode chamber (3-4), described cathode chamber (3-3) is communicated with the middle and lower part of anode chamber (3-4), top is separated by dividing plate (3-5), cathode chamber (3-3) is provided with positive plate (3-6), anode chamber (3-4) is provided with negative plate (3-7), positive and negative two battery lead plates connect outside positive-negative power respectively, the top of cathode chamber and anode chamber is conical structure, and the top of conical structure is all provided with effuser (3-8); Further, be positive plate material with ruthenium-iridium-tantalum electrode or ruthenium-iridium-tantalum tin electrode or iridium tantalum Ti electrode or iridium tantalum titanium tin electrode, Ti electrode is negative plate material; The exit of described electrolyzer is provided with triphase separator (3-9), outlet top is provided with overfalling weir (3-10), overfalling weir connects rising pipe, and the rising pipe of described electrolyzer is communicated with the water inlet pipe (4-1) in aerobic contact oxidation pond;

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).