CN111634993A

CN111634993A - Wastewater treatment device and method for improving ozone utilization rate in wastewater treatment

Info

Publication number: CN111634993A
Application number: CN202010635223.0A
Authority: CN
Inventors: 王乔; 周珉
Original assignee: Shanghai Chemical Industry Park Sino French Water Development Co ltd
Current assignee: Shanghai Chemical Industry Park Sino French Water Development Co ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2020-09-08

Abstract

The invention provides a wastewater treatment device and a method for improving the utilization rate of ozone in wastewater treatment, wherein the wastewater treatment device comprises a reactor and a reverse circulation system, wherein the reactor comprises a reactor body, a separation net and an aeration device, and a gas inlet and a gas outlet of the reverse circulation system are connected with a reaction cavity of the reactor in a fluid-flow manner; the wastewater treatment device and the method for improving the ozone utilization rate in wastewater treatment divide ozone bubbles into tiny ozone bubbles and slow down the rising rate of the ozone bubbles in the reactor, so that the contact time of the ozone bubbles and reaction liquid in the reactor can be prolonged, and the ozone utilization rate can be improved.

Description

Wastewater treatment device and method for improving ozone utilization rate in wastewater treatment

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a wastewater treatment device and a method for improving the utilization rate of ozone in wastewater treatment.

Background

Ozone oxidation is a commonly used technique in the field of sewage treatment. Ozone itself has strong oxidizing property, and can rapidly generate oxidation reaction with a plurality of organic pollutants in water to remove the organic pollutants. Ozone oxidation is mostly used as an advanced treatment process to remove the chemical oxygen demand and the chroma which are difficult to degrade in the biochemical secondary effluent. The treatment effect of the ozone process is not only related to the water quality, but also closely related to the process conditions in the treatment process.

At present, the structure improvement of a multi-side heavy reactor of a wastewater treatment device related to an ozone process. For example, the arrangement of aeration disks is improved to improve aeration efficiency, the water flow is used for turning back and going back for multiple times to increase hydraulic retention time, or internal circulation is added to improve water-gas mixing, and the like. However, in the ozone process, ozone bubbles will rise in the water due to buoyancy, and there is a possibility that the ozone bubbles will escape from the water and enter the gas phase without reacting with organic pollutants in the sewage or wastewater, which may negatively affect the ozone utilization rate.

Currently, some wastewater treatment plants are designed with very tall reactors, which take advantage of the height of the reactor to extend the residence time of a single ozone bubble in the water. However, this increases the height of the apparatus, greatly affects installation, movement and maintenance of the apparatus, and the indoor environment may not have enough space to use a tall reactor.

Also some effluent treatment plant have considered utilizing the diffuser plate to cut ozone gas into littleer bubble, utilize the plate body to slow down the rising of ozone bubble simultaneously, thereby increase the time of ozone bubble effusion water, prolong the reaction time of ozone and water, increase utilization ratio, but this kind of mode probably causes the unable reactor of in time discharging of filter residue that generates, block the diffuser plate, arouse the increase of reactor internal pressure simultaneously, lead to reactor inner structure impaired, and the clearance of diffuser plate is also inconvenient.

Therefore, it is desirable to provide a wastewater treatment apparatus and a method for improving the utilization rate of ozone in wastewater treatment to solve the above problems.

Disclosure of Invention

The invention provides a wastewater treatment device and a method for improving the utilization rate of ozone in wastewater treatment.

In order to achieve the purpose, the wastewater treatment device and the method for improving the ozone utilization rate in wastewater treatment adopt the following technical schemes.

The present invention provides a wastewater treatment apparatus, comprising: a reactor, the reactor includes a reactor body, at least an aeration equipment and at least a separate net, wherein: the reactor body is provided with a reaction cavity allowing the reaction liquid to enter and exit, the aeration device is arranged in the reaction cavity and is configured to provide ozone for the reaction liquid in the reaction cavity, and the separation net is arranged in the reaction cavity and is configured to divide ozone bubbles in the reaction liquid; and the gas inlet and the gas outlet of the reverse circulation system are both connected with the reaction cavity of the reactor in a fluid manner and are configured to lead out the tail gas in the reaction cavity and lead the led out tail gas into the reaction cavity again according to a preset angle.

Further, the reverse circulation system comprises a circulation pump and a plurality of gas injection pipelines which are fluidly connected with a gas outlet of the circulation pump, wherein: the air inlet of the circulating pump is fluidly connected to the reaction cavity and is used for controlling the flow rate of the air flow in each air injection pipeline; each gas injection pipeline extends along a direction inclined towards the bottom surface of the reaction cavity and is in fluid connection with the reactor body, so that the gas flow entering the reaction cavity through the gas injection pipelines has a velocity component towards the bottom of the reaction cavity.

Furthermore, a gas nozzle of each gas spraying pipeline is connected with a water-gas mixing device.

Further, at least one support is arranged in the reaction cavity, and the support is vertically arranged above the aeration device and connected to the wall of the reaction cavity; and the bracket is provided with a plurality of mounting positions distributed along the vertical direction of the bracket, and the separation net is mounted on the mounting positions of the bracket.

Further, the wastewater treatment device further comprises a tail gas treatment system, and a gas inlet of the tail gas treatment system is fluidly connected to the reaction cavity.

Further, a tail gas collecting port which is in fluid connection with the reaction cavity is arranged above the reactor body; and the air inlet of the reverse circulation system and the air inlet of the tail gas treatment pipeline are connected in parallel to the tail gas collecting port.

Further, the wastewater treatment device further comprises an ozone generation system which is fluidly connected to the aeration device through an air inlet pipeline to provide ozone to the aeration device.

Further, the reactor body is provided with a water inlet and a water outlet which are in fluid connection with the reaction cavity; the water inlet is positioned at the upper part of the reactor body, and the water outlet is positioned at the lower part of the reactor body.

Furthermore, the separation net comprises net wires and net holes surrounded by the net wires.

The invention also provides a method for improving the utilization rate of ozone in wastewater treatment, which comprises the following steps: cutting the ozone bubbles in the reaction cavity; and guiding the tail gas out of the reaction cavity and reintroducing the tail gas into the reaction cavity according to a preset angle.

As a preferred embodiment, the method for improving the utilization rate of ozone in wastewater treatment comprises the following steps: cutting ozone bubbles by using a separation net in the reaction cavity; and reintroducing the ozone tail gas led out from the reaction cavity into the reaction cavity according to a preset angle by using a reverse circulation system.

The wastewater treatment device and the method for improving the utilization rate of ozone in wastewater treatment have the beneficial effects that:

according to the wastewater treatment device, the separation net is additionally arranged, so that the ozone bubbles in the reaction cavity can be cut into more tiny ozone bubbles, and the rising rate of the ozone bubbles is slowed down, so that the contact time of ozone and reaction liquid can be prolonged; the wastewater treatment device can reintroduce the ozone tail gas into the reaction cavity by arranging the reverse circulation system, so that on one hand, the rising rate of ozone bubbles can be further slowed down, the contact time of ozone and reaction liquid is prolonged, and on the other hand, the utilization rate of ozone can be improved; the gas outlet of the reverse circulation system is provided with a plurality of gas injection pipelines which are connected in parallel with the reactor, and the angles of the gas injection pipelines are adjusted, so that the quantity of reverse gas flows and the incident angles of the reverse gas flows can be increased, and the deceleration effect on the rising of ozone bubbles is enhanced; through the arrangement of the bracket, the position of the separation net in the vertical direction in the reaction cavity can be conveniently adjusted, and the separation net can be conveniently disassembled, assembled and cleaned; the wastewater treatment device provided by the invention has the advantages of reasonable structure, strong practicability and high ozone utilization rate.

According to the method for improving the ozone utilization rate in the wastewater treatment, the ozone bubbles are cut into the micro bubbles, and meanwhile, the tail gas in the reaction cavity is reintroduced into the reaction cavity, so that the contact time of ozone and wastewater is prolonged, and the ozone utilization rate is improved.

Drawings

The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.

FIG. 1 is a schematic view showing the construction of a wastewater treatment apparatus according to the present invention.

Fig. 2 is a schematic structural diagram of the separation net.

The reference numbers in the drawings are respectively:

10. a reactor;

11. a reactor body;

111. a reaction chamber;

112. a water inlet;

113. a water outlet;

114. a tail gas collection port;

12. an aeration device;

13. separating the net;

131. mesh openings;

132. a network cable;

14. a support;

20. a reverse circulation system;

21. a circulation pump;

22. an air jet line;

30. a tail gas treatment system;

40. an ozone generation system.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

FIG. 1 is a schematic view showing the construction of a wastewater treatment apparatus according to the present invention. As shown in FIG. 1, the present invention provides a wastewater treatment apparatus, which comprises a reactor 10, a reverse circulation system 20, an exhaust gas treatment system 30, and an ozone generation system 40.

As shown in fig. 1, the reactor 10 includes a reactor body 11, an aeration device 12, at least one screen 13, and at least one support 14.

As shown in fig. 1, the reactor body 11 has a reaction chamber 111, and a water inlet 112, a water outlet 113 and a tail gas collecting port 114 in fluid communication 3 with the reaction chamber 111.

Wherein, the reaction chamber 111 can be used for containing the reaction liquid and allowing the reaction liquid to enter and exit. Specifically, the reaction chamber 111 is a main reaction site for performing wastewater treatment, fluid reaction, or other liquid treatment. In this embodiment, the reaction solution may be wastewater or sewage. Of course, the type of the reaction liquid is not limited thereto.

Specifically, the water inlet 111 is located at the top of the reaction chamber 111, and the water outlet 112 is located at the bottom of the reaction chamber 111.

When it is pointed out that, the reactor body 11 can make the reaction liquid in the reaction cavity 111 flow in the vertical direction by adopting an upper water inlet and lower water outlet mode, which is favorable for the convection of the liquid in the reaction cavity 111.

Specifically, the off-gas collecting port 114 is located at the upper portion of the reaction chamber 111, and is used for guiding off-gas in the reaction chamber 111 out of the top portion of the reaction chamber 111.

For example, as shown in fig. 1, in the present embodiment, the off-gas collecting port 114 is disposed above the reactor body 11 and is in fluid communication with the reaction chamber 111.

The tail gas collecting port 114 is arranged above the reactor body 11, so that the tail gas collecting port 114 is communicated with the top of the reaction cavity 111, and the retention time of ozone bubbles in the reaction cavity 111 can be prolonged.

In practice, the reactor body 11 may be a conventional reaction tank or a reaction tower, or may be a specially designed reaction vessel of other shapes or types. The invention is not limited in this regard.

As shown in fig. 1, the aeration device 12 is located at the bottom of the reaction chamber 111 and is configured to supply ozone into the reaction chamber 111.

Specifically, the aeration device 12 is arranged at the bottom of the reaction chamber 111 to facilitate the sufficient contact of ozone and the reaction liquid. In specific implementation, the aeration device 12 is horizontally arranged at the bottom of the reaction chamber 111.

For example, as shown in fig. 1, in the present embodiment, the aeration device 12 is located at the lower part of the reaction chamber 111 and is fluidly connected to the ozone generating system 30 through an air inlet pipe to supply the ozone of the ozone generating system 30 into the reaction chamber 111.

In one embodiment, the aeration device 12 may be an aeration tray. The aeration disc can enable ozone to form ozone bubbles through the diffusion effect of micropores of the aeration disc, the quantity of the ozone bubbles is large, the retention time in water is long, the specific surface area is large, and the contact oxidation effect of ozone molecules and pollutants is improved.

In the specific implementation, the contact area between the ozone and the reaction solution can be further increased by adjusting the area of the aeration device 12.

As shown in fig. 1, the support 14 is located in the reaction chamber 111 and is vertically disposed above the aeration device 12, and the support 14 is configured with a plurality of mounting positions distributed along the vertical direction thereof, and the mounting positions are at least used for mounting the partition net 13. By arranging the bracket 14, the installation, position adjustment, disassembly and cleaning of the separation net 13 are facilitated.

In specific implementation, the support 14 may be fixedly installed on the inner wall of the reaction chamber 111, or may be installed on the inner wall of the reaction chamber 111 by using a lifting mechanism.

As shown in fig. 1, the screen 13 is disposed in the reaction chamber 111. On one hand, the partition net 13 can divide the ozone bubbles in the reaction cavity 111 into micro-bubbles, so as to increase the contact area between the ozone and the reaction liquid in the reaction cavity 111; on the other hand, the screen 13 can slow down the rising rate of ozone bubbles, increase the residence time of ozone in the reaction chamber 111, and increase the reaction time of ozone and the reaction liquid in the reaction chamber 111. In combination with the two aspects, the separation net 13 can improve the utilization rate of ozone.

Specifically, the partition net 13 is horizontally disposed above the aeration device 12 to ensure that the partition net 13 can sufficiently cut the ozone bubbles. As a preferred embodiment, the separation net 13 is arranged at a plurality of different heights above the aeration device 12, so as to ensure that the ozone bubbles are cut sufficiently.

Specifically, the screen 13 is attached to the holder 14 in the reaction chamber 111. Alternatively, the screen 13 is supported or mounted by the frame 14.

Fig. 2 is a schematic structural diagram of the separation net. As shown in fig. 2, the partition net 13 includes a net wire 131 and a net hole 132 surrounded by the net wire 131. Wherein the mesh wire 131 can divide the ozone bubbles rising to the screen 13 into fine bubbles and can slow down the rising rate of the bubbles. The mesh 132 allows the micro bubbles to pass through.

In specific implementation, the entire screen 13 is made of an ozone-resistant material. The ozone-resistant material may be, but is not limited to, 316L stainless steel or teflon.

In particular, one or more of said screens 13 are arranged in a vertical direction inside said reaction chamber 111. In practical implementation, the separation net 13 is installed at the installation position of the bracket 14.

It should be noted that the number of the spacers 13 and the number or shape of the mesh holes 132 are not limited in the present invention. That is, in actual use or design, the number of the spacers 13 can be specifically increased or decreased according to actual needs, and the shape of the mesh 132 or the size of the mesh 132 can be changed according to actual needs.

As shown in fig. 1, the ozone generation system 40 is disposed outside the reactor 11 and is fluidly connected to an aeration device 12 disposed within the reaction chamber 111 to provide ozone to the aeration device 12.

In specific implementation, the ozone generation system 40 includes an oxygen source, a gas purifier, an ozone generator, a pressure maintaining valve, and a flow meter.

As shown in fig. 1, in the present embodiment, the aeration device 12 is horizontally disposed at the lower portion of the reaction chamber 111, and the ozone generation system 40 is fluidly connected to the aeration device 12 through an air inlet pipe to supply the generated ozone to the aeration device 12.

As shown in fig. 1, the gas inlet and the gas outlet of the reverse circulation system 20 are fluidly connected to the reaction chamber 111 of the reactor 10, so as to lead out the ozone off-gas of the reaction chamber 111 and reintroduce the led-out ozone off-gas into the reaction chamber 111 according to a preset angle.

As shown in fig. 1, the reverse circulation system 20 includes a circulation pump 21 and a plurality of gas injection pipelines 22, wherein an air inlet of the circulation pump 21 is fluidly connected to the exhaust gas collecting port 114, and the plurality of gas injection pipelines 22 are connected in parallel between the circulation pump 21 and the reaction chamber 111. The circulation pump 21 is used for controlling the flow rate of the gas in each of the gas injection pipes 22, and each of the gas injection pipes 22 is capable of providing the reverse flow of the reverse circulation system 20 (i.e. the gas flow in the reverse circulation system 20) to the reaction chamber 111.

Through setting up circulating pump 21, the velocity of flow of reverse air current can be adjusted through circulating pump 21 to under guaranteeing different ozone inlet velocity, all can go up ozone bubble and carry out effective speed reduction.

Specifically, each of the gas injection pipelines 22 is provided with a water-gas mixing device to improve the mixing degree of the tail gas and the reaction liquid.

In specific implementation, the water-vapor mixing device can be, but is not limited to, a venturi tube or a water ejector.

As shown in fig. 1, the gas injection pipes 22 respectively extend in a direction inclined toward the bottom surface of the reaction chamber 111 and are fluidly connected to the reaction chamber 111, so that the gas flow entering the reaction chamber 111 through the gas injection pipes 22 has a velocity component toward the bottom of the reaction chamber 111. Alternatively, the gas flow entering the reaction chamber 111 from the gas nozzles of the gas injection line 22 has a tendency to flow towards the bottom of the reaction chamber 111.

On the one hand, the flow direction of the reverse airflow in the reaction chamber 111 is opposite to the rising direction of the ozone bubbles in the reaction liquid, so that the ozone bubbles can be decelerated to rise, and the retention time of the ozone bubbles in the reaction liquid can be prolonged; on the other hand, the reverse airflow is provided to the reaction chamber 111, which substantially recycles the tail gas, and also recycles the residual ozone in the tail gas, thereby improving the utilization rate of ozone as a whole.

In practical applications, the angle of the gas flow jetted from the reverse circulation system 20 into the reaction solution can be adjusted by adjusting the included angle of the gas jet pipeline 22 relative to the reactor 11.

For example, as shown in fig. 1, in the present embodiment, the gas injection pipeline 22 forms an acute angle with the bottom surface of the reaction chamber 111 to ensure that the flow direction of the reverse gas flow injected from the gas injection pipeline 22 to the reaction liquid is opposite to the rising direction of ozone bubbles.

As shown in fig. 1, the plurality of gas injection pipelines 22 are vertically distributed along the side wall of the reactor 11 and respectively communicate with the reaction chamber 111.

As shown in fig. 1, an air inlet of the tail gas treatment system 30 is fluidly connected to the reactor 10, and is configured to treat the tail gas extracted from the reaction chamber 111 to prevent ozone from being discharged into the air to cause environmental pollution.

Specifically, the exhaust gas treatment system 30 includes an ozone meter and an ozone destruction device 31. The ozone destruction device 31 is used for decomposing residual ozone in the tail gas, and the ozone tail gas tester can measure the content of ozone in the tail gas and can automatically control the starting and stopping of the ozone destruction device.

The invention also provides a method for improving the utilization rate of ozone in wastewater treatment, which comprises the following steps: cutting ozone bubbles by using a separation net in the reaction cavity; and reintroducing the ozone tail gas led out from the reaction cavity into the reaction cavity according to a preset angle by using a reverse circulation system.

Specifically, the wastewater treatment process specifically comprises the following steps:

s1, installing a separation net, and introducing reaction liquid into the reaction cavity;

s2, starting an ozone generation system and a tail gas treatment system, and introducing ozone into the reaction liquid;

s3, starting a reverse circulation system, and leading out ozone tail gas in the reaction cavity and reintroducing the ozone tail gas into the reaction cavity according to a preset angle; and the number of the first and second groups,

s4, after the reaction is finished, closing the wastewater treatment device.

In step S1, a mesh 13 is first installed in the reaction chamber 111, and then a reaction solution, i.e., wastewater, is supplied into the reaction chamber 111 through a water inlet line fluidly connected to the water inlet 112 of the reactor 11.

In step S2, the ozone generating system 40 and the tail gas treatment system 30 are first started, and then ozone is passed through the air inlet pipe and the aeration device 12 to the reaction chamber 111, so as to ensure that the wastewater treatment is performed under the condition of sufficient ozone concentration, and to avoid environmental pollution caused by ozone dissipation.

In step S3, the exhaust gas in the reaction chamber 111 is led out by the reverse circulation system 20 and the led-out exhaust gas is reintroduced into the reaction chamber 111 according to a preset angle.

In specific implementation, the flow rate of the reverse tail gas in the reverse circulation system 20 can be adjusted by the circulation pump 21, so as to ensure that the rising of bubbles can be effectively decelerated at different ozone inlet rates.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The above detailed description of the wastewater treatment device and the method for improving the ozone utilization rate in wastewater treatment provided by the embodiment of the invention, and the specific examples are applied herein to illustrate the principle and the implementation of the invention, and the description of the above embodiments is only used to help understand the technical scheme and the core idea of the invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An apparatus for treating wastewater, comprising:

a reactor, the reactor includes a reactor body, at least an aeration equipment and at least a separate net, wherein: the reactor body is provided with a reaction cavity allowing the reaction liquid to enter and exit, the aeration device is arranged in the reaction cavity and is configured to provide ozone for the reaction liquid in the reaction cavity, and the separation net is arranged in the reaction cavity and is configured to divide ozone bubbles in the reaction liquid; and the number of the first and second groups,

and the gas inlet and the gas outlet of the reverse circulation system are both connected with the reaction cavity of the reactor in a fluid manner and are configured to lead out tail gas in the reaction cavity and lead the led out tail gas into the reaction cavity again according to a preset angle.

2. The wastewater treatment plant of claim 1 wherein the reverse circulation system comprises a circulation pump and a plurality of jet lines fluidly connected to an outlet of the circulation pump, wherein:

the air inlet of the circulating pump is fluidly connected to the reaction cavity and is used for controlling the flow rate of the air flow in each air injection pipeline;

each gas injection pipeline extends along a direction inclined towards the bottom surface of the reaction cavity and is in fluid connection with the reactor body, so that the gas flow entering the reaction cavity through the gas injection pipelines has a velocity component towards the bottom of the reaction cavity.

3. The wastewater treatment plant according to claim 2, wherein a water-gas mixing device is connected to the gas outlet of each of said gas injection lines.

4. The wastewater treatment device according to claim 1, wherein at least one bracket is arranged in the reaction chamber, is vertically arranged above the aeration device and is connected to the wall of the reaction chamber;

and the bracket is provided with a plurality of mounting positions distributed along the vertical direction of the bracket, and the separation net is mounted on the mounting positions of the bracket.

5. The wastewater treatment plant of claim 1, further comprising an off-gas treatment system, an inlet of the off-gas treatment system being fluidly connected to the reaction chamber.

6. The wastewater treatment plant according to claim 5, wherein the reactor body has a tail gas collection port above it, which is fluidly connected to the reaction chamber;

and the air inlet of the reverse circulation system and the air inlet of the tail gas treatment pipeline are connected in parallel to the tail gas collecting port.

7. The wastewater treatment plant of claim 1 further comprising an ozone generation system fluidly connected to the aeration device by an air intake conduit to provide ozone to the aeration device.

8. The wastewater treatment plant of claim 1, wherein the reactor body is configured with a water inlet and a water outlet fluidly connected to the reaction chamber;

the water inlet is positioned at the upper part of the reactor body, and the water outlet is positioned at the lower part of the reactor body.

9. The wastewater treatment apparatus of claim 1, wherein the screen comprises a mesh wire and a mesh opening surrounded by the mesh wire.

10. A method for increasing the utilization rate of ozone in wastewater treatment, characterized in that the treatment method comprises the following steps:

cutting the ozone bubbles in the reaction cavity; and the number of the first and second groups,

and leading out the tail gas in the reaction cavity and reintroducing the tail gas into the reaction cavity according to a preset angle.