阅读说明：本技术 用于处理废水的臭氧催化氧化池 (Ozone catalytic oxidation tank for treating wastewater ) 是由 赵皓翰 于 2019-08-19 设计创作，主要内容包括：本发明公开了一种用于处理废水的臭氧催化氧化池,包括池体、臭氧曝气系统以及催化剂填料层,池体内依次间隔设有第一分隔板、第二分隔板以及第三分隔板,以将腔体分隔为废水区、臭氧混合区以及臭氧催化氧化区,臭氧曝气系统安装于臭氧混合区内,臭氧曝气系统的顶面低于第一分隔板的第二端的顶面,臭氧曝气系统的底面高于第二分隔板的第二端的底面,催化剂填料层安装于臭氧催化氧化区并与臭氧催化氧化区连通,催化剂填料层的顶面低于第三分隔板的第二端的顶面,催化剂填料层的底面高于第二分隔板的底面,且催化剂填料层内设有颗粒状的催化剂。其能够保证臭氧与分水充分混合,提高臭氧生成羟基自由基的转化效率,从而提高高级氧化反应的效率。(The invention discloses an ozone catalytic oxidation pond for treating wastewater, which comprises a pond body, an ozone aeration system and a catalyst packing layer, wherein a first partition plate, a second partition plate and a third partition plate are sequentially arranged in the pond body at intervals so as to divide a cavity into a wastewater area, an ozone mixing area and an ozone catalytic oxidation area, the ozone aeration system is arranged in the ozone mixing area, the top surface of the ozone aeration system is lower than the top surface of the second end of the first partition plate, the bottom surface of the ozone aeration system is higher than the bottom surface of the second end of the second partition plate, the catalyst packing layer is arranged in the ozone catalytic oxidation area and communicated with the ozone catalytic oxidation area, the top surface of the catalyst packing layer is lower than the top surface of the second end of the third partition plate, the bottom surface of the catalyst packing layer is higher than the bottom surface of the second partition plate. The method can ensure that the ozone and the water are fully mixed, and improve the conversion efficiency of generating hydroxyl radicals by the ozone, thereby improving the efficiency of advanced oxidation reaction.)

1. An ozone catalytic oxidation tank for treating wastewater, comprising:

the cell body is of a closed structure with a cavity, a first partition plate, a second partition plate and a third partition plate are sequentially arranged in the cell body at intervals so as to divide the cavity into a wastewater area, an ozone mixing area and an ozone catalytic oxidation area, one end of the cell body close to the wastewater area is provided with a water inlet for wastewater to enter, the water inlet is close to the bottom of the wastewater area and communicated with the wastewater area, the first end of the first partition plate is connected with the bottom wall of the cavity, the second end of the first partition plate is arranged at intervals with the top wall of the cavity to form a first channel, the first channel is communicated with the wastewater area and the ozone mixing area, the first end of the second partition plate is connected with the top wall of the cavity, and the second end of the second partition plate is arranged at intervals with the bottom wall of the cavity to form a second channel, the second channel is communicated with the ozone mixing zone and the ozone catalytic oxidation zone, the first end of the third partition plate is connected with the bottom wall of the cavity, the second end of the third partition plate and the top wall of the cavity are arranged at intervals to form a third channel, one end of the tank body close to the ozone catalytic oxidation zone is provided with a water outlet, and the water outlet is communicated with the third channel;

the ozone aeration system is used for being communicated with an ozone generator and is arranged in the ozone mixing area, the top surface of the ozone aeration system is lower than the top surface of the second end of the first partition plate, and the bottom surface of the ozone aeration system is higher than the bottom surface of the second end of the second partition plate;

the catalyst packing layer is arranged in the ozone catalytic oxidation area and communicated with the ozone catalytic oxidation area, the top surface of the catalyst packing layer is lower than the top surface of the second end of the third partition plate, the bottom surface of the catalyst packing layer is higher than the bottom surface of the second partition plate, and granular catalysts are arranged in the catalyst packing layer.

2. The catalytic ozonation cell for treating wastewater according to claim 1, wherein the catalyst packing layer comprises a supporting filter plate, the bottom surface of the supporting filter plate is higher than the bottom surface of the second end of the second partition plate, a packing cavity is defined by the supporting filter plate, the second partition plate, the third partition plate and the cavity, the packing cavity is communicated with the catalytic ozonation zone, the granular catalyst is filled in the packing cavity, a plurality of uniformly distributed long-handle filter heads are arranged on the supporting filter plate, and the long-handle filter heads are communicated with the bottom of the catalytic ozonation zone and the packing cavity.

3. The catalytic ozonation cell for treating wastewater according to claim 2, further comprising a back washing system, wherein the back washing system is used for washing the catalyst packing layer, the back washing system is located below the catalyst packing layer, a water drainage channel is further arranged at the top of the catalyst packing layer, the water drainage channel is communicated with the packing cavity, the water drainage channel is lower than the top surface of the third partition plate, and a water outlet is further formed in the cell body and is communicated with the water drainage channel and the outside.

4. The catalytic ozonation cell of claim 3, wherein the drain channel is U-shaped.

5. The ozonation cell of claim 3, wherein the backwash system comprises a water pump and a plurality of backwash water pipes, the water pump is connected to a water source, one end of each backwash water pipe is connected to the water pump, and the other end of each backwash water pipe is connected to the bottom of the ozonation zone.

6. The catalytic ozonation cell for treating wastewater according to claim 2, wherein the support filter plate is a concrete pouring plate, and the support filter plate is provided with mounting holes matched with the long-handle filter head.

7. The catalytic ozonation cell for treating wastewater according to claim 1, wherein at least one ozone mixing zone is provided, and the number of the catalytic ozonation zones corresponds to the number of the ozone mixing zones.

8. The ozonation catalytic oxidation tank of claim 1, wherein the ozone aeration system is one or a combination of a micro-pore aerator, a radial flow aerator, or a solvent aerator.

9. The catalytic ozonation cell of claim 1, wherein the catalyst is any one or a combination of an activated carbon-supported ferrimanganic catalyst, an activated slag catalyst and a ferrimanganic compound ceramsite-based catalyst.

10. The catalytic ozonation cell for treating wastewater according to claim 1, wherein the cell body is cast using concrete or made using a stainless steel material.

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to an ozone catalytic oxidation tank for treating wastewater.

Background

In recent years, with the rapid development of economy and the continuous improvement of living standard of people, the problem of urban industrial wastewater in China is more and more severe. In order to improve the quality of water environment in China, governments of various parts have successively provided pollutant discharge standards of wastewater treatment plants.

The release of new emission standards has caused existing wastewater treatment plants to face the problem of upgrading. At present, part of industrial wastewater can be mixed into the water from the municipal wastewater treatment plant frequently, so that the raw water components are complex, the content of refractory organic matters is high, the biodegradability is poor, the COD of the wastewater treatment plant is difficult to reach the standard, especially, the content of the refractory toxic and harmful organic matters in the water is increased, the difficulty in deep treatment technology selection of the wastewater treatment plant is increased, and the upgrading and transformation work of the wastewater treatment plant is greatly influenced. Accordingly, there is a need to employ more efficient treatment techniques than conventional biochemical treatment processes.

In recent years, advanced oxidation technology is increasingly applied to advanced treatment of wastewater treatment plants, and commonly used technologies include Fenton reagent oxidation technology, electrocatalytic oxidation, ozone oxidation technology and the like.

The Fenton reagent oxidation technology is characterized in that Fe2+ is used for catalyzing H2O2 to generate hydroxyl free radicals (OH, the oxidation-reduction potential is 2.80V) with strong oxidizability and no reaction selectivity under an acidic condition, organic matters which are difficult to degrade can be oxidized into carbon dioxide and water, or toxic and harmful substances can be oxidized into harmless substances, but the technology has the defects of introduction of miscellaneous salts, harsh reaction conditions and high operation cost.

The electrocatalytic oxidation technology has the problems of low oxidation degradation efficiency and high operation cost in the engineering application process.

Among these advanced oxidation techniques, mention may be made of ozone oxidation techniques or ozone catalytic oxidation techniques. The ozone oxidation technology is also used for removing refractory organic matters in wastewater by using hydroxyl free radicals (. OH), has become one of key technologies for removing high-stability and refractory organic matters in wastewater due to the advantages of no secondary pollution, high oxidation efficiency, simple operation and the like, and is more and more favored in the advanced treatment process of wastewater upgrading and reforming of wastewater in wastewater treatment plants.

An existing catalytic ozonation device for wastewater treatment, for example, an ozone catalytic ozonation tank device for wastewater disclosed in patent application No. CA201420640029.1, includes an ozone catalytic ozonation tank, which mainly includes a multistage ozone catalyst fluidization tank, a multistage ozone catalyst filtration tank and a clean water tank, wherein a wastewater inlet pipe is communicated with the bottom of the first stage ozone catalyst fluidization tank for wastewater to enter, an ozone aeration tray for ozone aeration is arranged at the bottom of the ozone catalyst fluidization tank, the ozone aeration tray is communicated with an ozone inlet pipe for providing ozone, a catalyst fluidized bed is arranged at the middle position of the ozone catalyst fluidization tank, a granular catalyst is arranged on the catalyst fluidized bed, wastewater and ozone gas flow upward through the catalyst fluidized bed from the bottom of the tank for catalytic ozonation reaction, the wastewater treated by the wastewater ozone catalytic oxidation pond device has the COD removal efficiency of more than 50 percent and the chroma removal efficiency of more than 80 percent.

However, in the above-mentioned wastewater ozone catalytic oxidation device, the ozone aeration disc and the catalyst fluidized bed are disposed in the same region and are not separately disposed, so that the ozone and the wastewater are not sufficiently mixed, the mass transfer of gas and liquid phases is poor, the utilization rate of ozone is reduced, and the cost is high.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide an ozone catalytic oxidation pond for treating wastewater, which can ensure that ozone and wastewater are fully mixed, improve the utilization rate of ozone, improve the wastewater treatment efficiency and reduce the cost.

The purpose of the invention is realized by adopting the following technical scheme:

an ozone catalytic oxidation tank for treating wastewater, comprising:

the cell body is of a closed structure with a cavity, a first partition plate, a second partition plate and a third partition plate are sequentially arranged in the cell body at intervals so as to divide the cavity into a wastewater area, an ozone mixing area and an ozone catalytic oxidation area, one end of the cell body close to the wastewater area is provided with a water inlet for wastewater to enter, the water inlet is close to the bottom of the wastewater area and communicated with the wastewater area, the first end of the first partition plate is connected with the bottom wall of the cavity, the second end of the first partition plate is arranged at intervals with the top wall of the cavity to form a first channel, the first channel is communicated with the wastewater area and the ozone mixing area, the first end of the second partition plate is connected with the top wall of the cavity, and the second end of the second partition plate is arranged at intervals with the bottom wall of the cavity to form a second channel, the second channel is communicated with the ozone mixing zone and the ozone catalytic oxidation zone, the first end of the third partition plate is connected with the bottom wall of the cavity, the second end of the third partition plate and the top wall of the cavity are arranged at intervals to form a third channel, one end of the tank body close to the ozone catalytic oxidation zone is provided with a water outlet, and the water outlet is communicated with the third channel;

the ozone aeration system is used for being communicated with an ozone generator and is arranged in the ozone mixing area, the top surface of the ozone aeration system is lower than the top surface of the second end of the first partition plate, and the bottom surface of the ozone aeration system is higher than the bottom surface of the second end of the second partition plate;

the catalyst packing layer is arranged in the ozone catalytic oxidation area and communicated with the ozone catalytic oxidation area, the top surface of the catalyst packing layer is lower than the top surface of the second end of the third partition plate, the bottom surface of the catalyst packing layer is higher than the bottom surface of the second partition plate, and a granular fixed bed catalyst is arranged in the catalyst packing layer.

Further, the catalyst packing layer includes the bearing filter plate, the bottom surface of bearing filter plate is higher than the bottom surface of the second end of second division board, bearing filter plate, second division board, third division board with enclose between the cavity and close and form the filler cavity, the filler cavity with ozone catalytic oxidation district intercommunication, fill the certain height according to the quality of water needs of sewage in the filler cavity granular fixed bed catalyst, be equipped with a plurality of evenly distributed's long handle filter head on the bearing filter plate, long handle filter head intercommunication ozone catalytic oxidation district's bottom with the filler cavity. Further, the ozone catalytic oxidation pond for treating waste water further comprises a back washing system, the back washing system is used for washing the catalyst packing layer, the back washing system is located below the catalyst packing layer, a water drainage channel is further arranged at the top of the catalyst packing layer and communicated with the packing cavity, the water drainage channel is lower than the top surface of the third partition plate, a water outlet is further formed in the pond body, and the water outlet is communicated with the water drainage channel and the outside.

Further, the drainage channel is U-shaped.

Furthermore, the back flush system comprises a water pump and a plurality of back flush water pipes, the water pump is communicated with a water source, one ends of the back flush water pipes are communicated with the water pump, and the other ends of the back flush water pipes are communicated with the bottom of the ozone catalytic oxidation zone.

Furthermore, the bearing filter plate is a concrete pouring plate, and a mounting hole matched with the long-handle filter head is formed in the bearing filter plate.

Further, the ozone mixing area is provided with at least one ozone catalytic oxidation area, and the number of the ozone catalytic oxidation areas is the same as that of the ozone mixing area.

Further, the ozone aeration system is one or a combination of a microporous aerator, a radial flow aerator and a gas dissolving machine.

Further, the catalyst is any one or combination of an activated carbon loaded ferro-manganese catalyst, an activated slag catalyst and a ferrimanganese compound ceramsite-based catalyst.

Further, the tank body is formed by pouring concrete or is made of stainless steel materials.

Compared with the prior art, the invention has the beneficial effects that:

the first end of the first partition board is connected with the bottom wall of the cavity, the second end of the first partition board is arranged at intervals with the top wall of the cavity to form a first channel, the first end of the second partition board is connected with the top wall of the cavity, the second end of the second partition board is arranged at intervals with the bottom wall of the cavity to form a second channel, the first end of the third partition board is connected with the bottom wall of the cavity, the second end of the third partition board is arranged at intervals with the top wall of the cavity to form a third channel, so that the waste water area, the ozone mixing area and the ozone catalytic oxidation area can be sequentially separated, the first channel and the second channel are arranged in a staggered manner, the second channel and the third channel are arranged in a staggered manner, and waste water circulates from bottom to top, thereby achieving the purpose of fully contacting gas and liquid in reverse direction. Because the generation quantity of the hydroxyl radicals depends on the surface area of the catalyst and the hydroxyl radical oxidation reaction has no selectivity, on one hand, the ozone mixing zone can ensure that ozone directly reacts with pollutants which are easy to oxidize in water, and on the other hand, the ozone which does not participate in the reaction is fully dissolved into the wastewater in the mixing zone to prepare for the next catalytic oxidation reaction, thereby improving the utilization rate of the ozone, and simultaneously improving the treatment efficiency of the wastewater and the utilization efficiency of the catalyst;

in addition, by reasonably arranging the position of the ozone aeration system, a certain interception effect on ozone can be achieved, the ozone can be prevented from being diffused to a wastewater area to a certain extent, the utilization rate of the ozone is improved, the wastewater can be prevented from directly flowing to an ozone catalytic oxidation area, the wastewater and the ozone can collide with a convex part of a second partition plate to achieve the stirring effect, so that the ozone is more easily dissolved in the wastewater, the ozone and the wastewater can be further ensured to be fully mixed, the catalytic oxidation efficiency of the ozone is improved, and the treatment efficiency of the wastewater is improved;

in addition, through the position of reasonable setting catalyst packing layer, can increase the interval between ozone mixed region and the ozone catalytic oxidation district to can make waste water and ozone can the intensive mixing, simultaneously, still can make the waste water that has dissolved ozone can be in this catalyst packing layer after the intensive catalytic oxidation, flow to the delivery port again, make the purifying effect of waste water better.

Drawings

FIG. 1 is a sectional view taken along the A-A vertical plane of an ozone catalytic oxidation tank for treating wastewater according to the present invention;

FIG. 2 is a sectional view taken along line B-B of the catalytic ozonation cell shown in FIG. 1 for treating wastewater;

FIG. 3 is a C-C sectional view of the catalytic ozonation cell shown in FIG. 1 for treating wastewater.

In the figure: 1. a tank body; 11. a first partition plate; 12. a second partition plate; 13. a third partition plate; 14. a waste water zone; 15. an ozone mixing zone; 16. an ozone catalytic oxidation zone; 17. a water inlet; 18. a water outlet; 19. a drainage channel; 110. a water outlet; 2. a microporous aerator; 3. a catalyst packing layer; 31. a catalyst; 32. supporting the filter plate; 321. a long-handle filter head.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

Referring to fig. 1-3, an ozone catalytic oxidation tank for treating wastewater according to a preferred embodiment of the present invention is shown, which comprises a tank body 1, an ozone aeration system and a catalyst packing layer 3.

Wherein, the tank body 1 is a closed structure with a cavity, as shown in fig. 1, a first partition plate 11, a second partition plate 12 and a third partition plate 13 are sequentially arranged in the tank body 1 at intervals to divide the cavity into a waste water zone 14, an ozone mixing zone 15 and an ozone catalytic oxidation zone 16, one end of the tank body 1 close to the waste water zone 14 is provided with a water inlet 17 for waste water to enter, the water inlet 17 is arranged close to the bottom of the waste water zone 14, the water inlet 17 is communicated with the waste water zone 14 to allow waste water to flow into the waste water zone 14, as shown in fig. 1, a first end of the first partition plate 11 is fixedly connected with the bottom wall of the cavity, a second end of the first partition plate 11 is arranged at intervals with the top wall of the cavity to form a first channel, the first channel is communicated with the waste water zone 14 and the ozone mixing zone 15, so that the waste water zone 14 and the ozone mixing zone 15 are separated to allow waste water to flow to the ozone mixing zone 15 from, meanwhile, the diffusion of ozone towards the wastewater region 14 can be avoided to the greatest extent to improve the utilization rate of ozone, as shown in fig. 2, the first end of the second partition plate 12 is connected with the top wall of the cavity, the second end of the second partition plate 12 and the bottom wall of the cavity are arranged at intervals to form a second channel, the second channel is communicated with the ozone mixing region 15 and the ozone catalytic oxidation region 16, so that the ozone mixing region 15 and the ozone catalytic oxidation region 16 can be separated, the ozone mixing region 15 and the ozone catalytic oxidation region 16 are separated by a certain distance, the circulation time of wastewater in the certain distance is increased, the wastewater can be fully mixed with ozone in the circulation process of the certain distance and then flows to the ozone catalytic oxidation region 16 from bottom to top through the second channel, the phenomenon that the wastewater flows to the ozone catalytic oxidation region 16 without being fully mixed with ozone is avoided, as shown in fig. 1, the first end of the third partition plate 13 is connected with the bottom wall of the cavity, a third channel is formed between the second end of the third partition plate 13 and the top wall of the cavity at intervals, a water outlet 18 is formed in one end of the tank body 1 close to the ozone catalytic oxidation zone 16, and the water outlet 18 is communicated with the third channel so that treated wastewater can flow out of the tank body 1.

Specifically, the ozone aeration system is used to communicate with an ozone generator to provide ozone for the ozone aeration system, as shown in fig. 1 and fig. 2, the ozone aeration system is installed in the ozone mixing zone 15, the top surface of the ozone aeration system is lower than the top surface of the second end of the first partition plate 11, and the bottom surface of the ozone aeration system is higher than the bottom surface of the second end of the second partition plate 12, so that the portion of the first partition plate 11 protruding out of the ozone aeration system can intercept the ozone to a certain extent, prevent the ozone from diffusing to the wastewater zone 14 to increase the utilization rate of the ozone, and the portion of the second partition plate 12 protruding out of the ozone aeration system can intercept the wastewater in the ozone mixing zone 15, prevent the wastewater from directly flowing to the catalytic ozonation zone 16, and simultaneously prevent the wastewater and the ozone from colliding with the protruding portion of the second partition plate 12, play the effect of stirring, make ozone dissolve in the middle of waste water more easily to can further guarantee ozone and waste water intensive mixing, improve the catalytic oxidation efficiency of ozone, thereby improve the treatment effeciency of waste water.

Catalyst packing layer 3 is installed in ozone catalytic oxidation district 16 and is communicate with ozone catalytic oxidation district 16, so that waste water can freely pass this catalyst packing layer 3, the top surface of this catalyst packing layer 3 is less than the top surface of the second end of third division board 13, the bottom surface of this catalyst packing layer 3 is higher than the bottom surface of second division board 12, and be equipped with granular catalyst 31 in the catalyst packing layer 3, so, can increase the interval between ozone mixing zone 15 and ozone catalytic oxidation district 16, thereby can make waste water and ozone can the intensive mixing, and simultaneously, still can make the waste water that has dissolved ozone can be in this catalyst packing layer 3 after abundant catalytic oxidation, flow to delivery port 18 again, make the purifying effect of waste water better.

With continued reference to fig. 1, as a preferred embodiment, the catalyst packing layer 3 includes a support filter plate 32, a bottom surface of the support filter plate 32 is higher than a bottom surface of the second end of the second partition plate 12, a packing cavity is formed by enclosing the support filter plate 32, the second partition plate 12, the third partition plate 13 and a cavity, the packing cavity is communicated with the catalytic ozonation zone 16, a granular catalyst 31 is filled in the packing cavity, a plurality of uniformly distributed long-handled filter heads 321 are arranged on the support filter plate 32, the long-handled filter heads 321 are communicated with a bottom of the catalytic ozonation zone 16 and the packing cavity, so, a plurality of long handle filter heads 321 can play evenly distributed's effect to the waste water that has dissolved ozone, make the waste water that has dissolved ozone can flow to the packing chamber in an orderly manner, guarantee that the waste water that has dissolved ozone can be more abundant with the catalytic oxidation reaction between the catalyst 31, further improve the treatment effeciency of waste water.

In addition, during the catalytic oxidation reaction, hardness ions such as Ca and Mg in water and reaction products may be precipitated on the catalyst surface, which may cause hardening of the catalyst filler layer 3. Therefore, the catalytic ozonation cell for treating wastewater further comprises a backwashing system, the backwashing system is used for washing the catalyst packing layer 3, the backwashing system is located below the catalyst packing layer 3, a water drainage channel 19 is further arranged at the top of the catalyst packing layer 3, the water drainage channel 19 is communicated with the packing cavity, the water drainage channel 19 is lower than the top surface of the third partition plate 13, backwashing is carried out so that backwashing water flows into the water drainage channel 19 and is prevented from directly flowing to the water outlet 18, the backwashing water is prevented from being mixed with purified water to affect the quality of the purified water, the cell body 1 is further provided with a water outlet 110, and the water outlet 110 is communicated with the water drainage channel 19 and the outside so that the wastewater for washing the catalyst packing layer 3 can flow to the outside. The catalyst packing layer 3 is washed by arranging the backwashing system, the washing water flows to the catalyst packing layer 3 from bottom to top, the catalyst 31 in the catalyst packing layer 3 is washed, the catalyst 31 can be dispersed, the phenomenon that the catalysts 31 are stacked together to block the circulation of wastewater is avoided, the continuous and reliable operation of facilities is ensured, meanwhile, the surface of the catalyst 31 can be cleaned, the phenomenon that the catalytic reaction between the catalyst 31 and the wastewater dissolved with ozone is influenced by the residues stacked on the surface of the catalyst 31 is avoided, and the catalytic oxidation efficiency is improved.

Specifically, as shown in fig. 3, the drainage channel 19 is U-shaped, so that the area of the drainage channel 19 is large enough to reduce the resistance of sewage flow. Specifically, the backwashing system comprises a water pump and a plurality of backwashing water pipes, wherein the water pump is communicated with a water source, one ends of the plurality of backwashing water pipes are communicated with the water pump, and the other ends of the plurality of backwashing water pipes are communicated with the bottom of the ozone catalytic oxidation zone 16.

Specifically, the tank body 1 is formed by pouring concrete, the support filter plate 32 is a concrete pouring plate, and a mounting hole matched with the long-handle filter head 321 is formed in the support filter plate 32. The bearing filter plate 32 using the concrete pouring plate and the tank body 1 formed by pouring concrete can avoid corrosion, the service life can be prolonged, and meanwhile, the manufacturing difficulty is low, and the cost can be reduced. Of course, in this embodiment, the tank body 1 and the support filter plate 32 may also be made of stainless steel.

In a preferred embodiment, at least one ozone mixing area 15 is provided, and the number of the ozone catalytic oxidation areas 16 is the same as the number of the ozone mixing areas 15.

In this embodiment, the ozone mixing area 15 is provided with at least two, and the ozone mixing area 15 sets up adjacent with the ozone catalytic oxidation district 16, through setting up multistage ozone mixing area 15 and multistage ozone catalytic oxidation district 16, can improve the treatment effeciency of waste water, can further improve the purifying effect of waste water.

Specifically, the ozone aeration system is one or a combination of a microporous aerator 2, a radial flow aerator or a dissolved air machine, the microporous aerator 2 is provided with a plurality of ozone through holes, and the ozone through holes are communicated with the ozone mixing area 15 and the ozone generator.

In a preferred embodiment, the catalyst 31 is any one or a combination of an activated carbon composite manganese dioxide catalyst, an activated slag catalyst, and a manganese compound-containing ceramsite catalyst.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.