An ozone catalytic oxidation system based on water vapor high-frequency cutting dissolved gas and its use method

Abstract

The present application relates to a kind of ozone catalytic oxidation systems based on water gas high-frequency cutting solution gas, comprising: catalytic oxidation unit, including catalytic oxidation pool;Backflow unit, including gas-liquid mixing pump, first gas-liquid pipe and second gas-liquid pipe;Water gas high-frequency cutting solution gas unit, including water gas high-frequency cutting solution gas device, water gas high-frequency cutting solution gas device includes shell and hollow column;Pressurizing unit, including ozone generator, gas compressor, ozone communication pipe and ozone pipe;Release unit, including pressure release pipeline, pressure regulating valve and check valve.The present application also provides the method for using the above-mentioned system to handle wastewater.The present application carries out system structure integration and process method optimization to ozone catalytic oxidation technology, solves the problems such as low ozone solubility, low solubility concentration, low mass transfer efficiency, low ozone utilization rate of existing ozone catalytic oxidation technology, further improves the ozone utilization rate and reaction rate of ozone catalytic oxidation treatment technology, reduces processing cost, improves processing effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, especially to a kind of ozone catalytic oxidation system based on water gas high-frequency cutting dissolved gas and use method. BACKGROUND

[0002] Ozone catalytic oxidation technology is a kind of advanced oxidation process, in recent years widely used in papermaking, printing and dyeing, pharmaceutical, chemical industry wastewater pretreatment, tail water advanced treatment etc..Compared with Fenton and other traditional advanced oxidation technology, ozone catalytic oxidation has great advantage in water treatment technology due to its no secondary pollution, good treatment effect etc..

[0003] In ozone catalytic oxidation technology, the dissolved concentration of ozone in sewage has decisive influence on reaction rate and degradation effect.The traditional ozone catalytic oxidation technology dissolved gas stage often has the following problems: ① low dissolved gas efficiency, most ozone solubility is only 80%;② low dissolved concentration, ozone concentration in sewage system during reaction is only about 10%;③ in practical application, ozone dosage is usually increased to treat sewage, which greatly increases the operation cost, limits the application of the technology in actual engineering.In view of this, we propose a kind of ozone catalytic oxidation system based on water gas high-frequency cutting dissolved gas. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art, adapt to the needs of reality, provide a kind of ozone catalytic oxidation system based on water gas high-frequency cutting dissolved gas, solve the problems of low ozone solubility, low dissolved concentration, low mass transfer efficiency and low ozone utilization rate of existing ozone catalytic oxidation technology.

[0005] In order to achieve the purpose of the present application, the technical scheme adopted by the present application is:

[0006] A kind of ozone catalytic oxidation system based on water gas high-frequency cutting dissolved gas, comprising:

[0007] Catalytic oxidation unit, including catalytic oxidation pool, catalytic oxidation filler is arranged in the catalytic oxidation pool;

[0008] The reflux unit includes a gas-liquid mixing pump, a first gas-liquid pipe and a second gas-liquid pipe; wherein, one end of the first gas-liquid pipe is connected to the liquid outlet of the catalytic oxidation tank, and the other end of the first gas-liquid pipe is connected to the inlet end of the gas-liquid mixing pump; one end of the second gas-liquid pipe is connected to the outlet end of the gas-liquid mixing pump; a water-gas high-frequency cutting dissolving unit includes a plurality of water-gas high-frequency cutting dissolvers connected in series, and the water-gas high-frequency cutting dissolver includes an outer shell and a hollow column; wherein, the upper end of the outer shell is provided with a water inlet channel connected to the other end of the second gas-liquid pipe, and the bottom of the outer shell is provided with a water outlet channel; the hollow column is a pipe structure with an open top and a hollow interior, the opening at the top of the hollow column forms an air inlet channel, the lower end of the hollow column extends into the interior of the outer shell, and a plurality of jets are provided on the outer wall of the part of the hollow column located in the outer shell. air hole; a plurality of guide plates are fixedly provided on the outer wall of the part of the hollow column located in the shell, and the plurality of guide plates are connected in sequence to form a spiral plate structure; a pressurizing unit, comprising an ozone generator, a gas compressor, an ozone connecting pipe and an ozone tube; one end of the ozone connecting pipe is connected to the outlet end of the ozone generator, and the other end of the ozone connecting pipe is connected to the inlet end of the gas compressor; one end of the ozone tube is connected to the outlet end of the gas compressor, and the other end of the ozone tube is connected to the air inlet channel; a release unit, comprising a pressure relief pipe, and a pressure regulating valve and a check valve sequentially assembled in series on the pressure relief pipe, the inlet end of the pressure relief pipe is connected to the water outlet channel, the outlet end of the pressure relief pipe is connected to the liquid return port of the catalytic oxidation tank, and the diameter of the pressure relief pipe is larger than the inner diameter of the water outlet channel.

[0009] The present invention integrates the system structure and optimizes the process methods of ozone catalytic oxidation technology to solve the problems of low ozone solubility rate, low solubility concentration, low mass transfer efficiency, and low ozone utilization rate in existing ozone catalytic oxidation technology, further improves the ozone utilization rate and reaction rate of ozone catalytic oxidation treatment technology, reduces treatment costs, and improves treatment effects.

[0010] Preferably, the water inlet channel is an inclined channel structure with a high head end and a low tail end.

[0011] Preferably, the number of the water-gas high-frequency cutting aerators is 2-6, and the total length of a single water-gas high-frequency cutting aerator is 5-100 cm.

[0012] Preferably, the aperture of the jet air hole is 1.0-10.0 mm.

[0013] Preferably, the distance between two adjacent guide plates is 10-100 mm.

[0014] Preferably, the sewage inlet pipe, the discharge pipe, the first gas-liquid pipe, the second gas-liquid pipe, the ozone connecting pipe and the ozone pipe are all equipped with solenoid valves.

[0015] The application also provides a method for treating sewage by using the ozone catalytic oxidation system based on water-gas high-frequency cutting solution gas.

[0016] S1, the sewage to be treated enters the catalytic oxidation unit, and the sewage is mixed with the catalytic oxidation filler containing hydroxyl radicals in the catalytic oxidation tank to realize preliminary treatment of the organic pollutants in the sewage to be treated, and then enters the reflux unit;

[0017] S2, the sewage preliminarily treated in step S1 is introduced into the gas-liquid mixing pump through the first gas-liquid pipe, and the water pressure is increased to 0.1-1.0 Mpa under the action of the gas-liquid mixing pump, and then the sewage after the pressure increasing treatment is introduced into the water-gas high-frequency cutting solution gas unit through the second gas-liquid pipe;

[0018] S3, the ozone generated by the ozone generator is introduced into the gas compressor through the ozone communication pipe, the ozone pressure is increased to 0.1-1.0 Mpa by the gas compressor, and then the ozone is transported into the water-gas high-frequency cutting solution gas unit by the ozone pipe;

[0019] S4, the sewage introduced by the water inlet channel forms a cyclone under the action of the internal guide plate, and in this flow state, the sewage flow rate is high and in turbulent flow, the molecular collision is more frequent, the mass transfer efficiency is greatly improved, the pressurized ozone enters the high-speed cyclone sewage from the gas inlet channel of the hollow column along the tangent direction of the water flow under the action of the pressure and cuts into the high-speed cyclone sewage through the jet gas hole, and under the action of high pressure, the ozone forms high-frequency disturbance to the sewage, so that the ozone and the sewage are quickly dissolved, the dissolution improves the gas-liquid mass transfer efficiency, and a highly mixed cyclone state gas-liquid mixed fluid is formed, and then the gas-liquid mixed fluid enters the release unit; when operating in series, the sewage from the water outlet channel of the water-gas high-frequency cutting solution gas enters the next water inlet channel through the pipeline, and the mass transfer effect and the ozone utilization rate are repeatedly improved; due to the sufficient dissolution of the ozone and the high flow rate of the fluid, the mass transfer efficiency is greatly improved compared with the traditional pipeline mixing, the ozone utilization rate and the overall oxidation effect are improved;

[0020] S5, the gas-liquid mixed fluid generated in step S4 enters the pressure release pipeline through the water outlet channel, and then the pressure is reduced by the pressure regulating valve to form ozone super small bubbles in the gas-liquid mixed fluid, and then the water outlet of the release unit is backflowed to the catalytic oxidation tank to remove the remaining organic pollutants by using the hydroxyl radicals generated by the catalytic oxidation filler to reduce COD again, and part of the reacted water is backflowed for secondary removal of pollutants, and the remaining part is directly discharged or enters the next treatment unit; the pressure of the gas-liquid mixed fluid is released in the release unit, so that the ozone in the gas-liquid mixed fluid is released under appropriate pressure to form ozone super small bubbles, and at the same time, the disturbance of the high-pressure water body to the next process is avoided.

[0021] Furthermore, in step S2, the water pressure is increased to 0.15-0.5 MPa under the action of the gas-liquid mixing pump.

[0022] Furthermore, in step S3, the gas compressor increases the ozone pressure to 0.15-0.5 MPa.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention integrates the system structure and optimizes the process method of ozone catalytic oxidation technology to solve the problems of low ozone solubility rate, low solubility concentration, low mass transfer efficiency, and low ozone utilization rate in existing ozone catalytic oxidation technology, further improves the ozone utilization rate and reaction rate of ozone catalytic oxidation treatment technology, reduces treatment costs, and improves treatment effects.

[0025] 2. In the present invention, the partial pressure of ozone gas is increased by increasing the ozone pressure, thereby increasing the upper limit of ozone solubility in the system and improving the ozone solubility rate. At the same time, the jet ozone gas formed cuts the high-frequency high-speed vortex along the tangential direction of the water flow, accelerating the diffusion of ozone in the sewage, making the dissolved ozone more uniform in the sewage and reducing gas escape.

[0026] 3. The reaction system in the present invention is carried out under a high-pressure, high-flow-rate and highly mixed state. The mass transfer efficiency is improved compared with traditional pipeline mixing. The cutting frequency and speed can be controlled by adjusting the water pressure and air pressure, which greatly improves the reaction rate and reduces the residence time.

[0027] 4. The dissolved ozone in the present invention increases the number and rate of collisions with organic pollutants in sewage under the action of pressure, swirl and gas cutting, thereby improving the mass transfer efficiency, making the reaction more complete, and the ozone utilization rate is increased accordingly; and the same amount of ozone added can be more fully dissolved and reacted in this system, achieving a higher dissolution rate. Compared with traditional ozone catalytic oxidation technology, the ozone and water in the present invention have better oxidation effects on organic pollutants, and the higher ozone utilization rate and faster reaction rate effectively save ozone usage, system operating energy consumption, and equipment space. Compared with traditional ozone catalytic oxidation processes, the present invention effectively reduces sewage treatment costs and has better economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a process flow chart of the present invention for treating sewage using an ozone catalytic oxidation system based on high-frequency water vapor cutting of dissolved air;

[0029] Figure 2 Schematic diagram of the structure of the ozone catalytic oxidation system based on water vapor high-frequency cutting of dissolved gas according to an embodiment of the present invention;

[0030] Figure 3This is a partial structural diagram of a water-gas high-frequency cutting aerator according to an embodiment of the present invention.

[0031] Description of the numbers in the figure:

[0032] 1. Catalytic oxidation unit; 11. Catalytic oxidation tank; 12. Sewage inlet pipe; 13. Discharge pipe; 2. Reflux unit; 21. Gas-liquid mixing pump; 22. First gas-liquid pipe; 23. Second gas-liquid pipe; 3. Water-gas high-frequency cutting and dissolving unit; 31. Water-gas high-frequency cutting and dissolving device; 311. Housing; 3111. Water inlet channel; 3112. Water outlet channel; 312. Hollow column; 3121. Air inlet channel; 3122. Jet air hole; 313. Guide plate; 4. Pressurizing unit; 41. Ozone generator; 42. Gas compressor; 43. Ozone connecting pipe; 44. Ozone tube; 5. Release unit; 51. Pressure relief pipe; 52. Pressure regulating valve; 53. Check valve. DETAILED DESCRIPTION

[0033] To facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described with reference to the accompanying drawings.

[0034] Example 1

[0035] like Figure 1-Figure 3 As shown, this embodiment provides an ozone catalytic oxidation system based on water vapor high frequency cutting and dissolving gas, including a catalytic oxidation unit 1, a reflux unit 2, a water vapor high frequency cutting and dissolving gas unit 3, a pressurizing unit 4 and a releasing unit 5.

[0036] Specifically, the catalytic oxidation unit 1 includes a catalytic oxidation tank 11, a sewage inlet pipe 12 and a discharge pipe 13. The catalytic oxidation tank 11 is provided with catalytic oxidation filler. The outlet end of the sewage inlet pipe 12 is connected to the sewage inlet of the catalytic oxidation tank 11; one end of the discharge pipe 13 is connected to the discharge port of the catalytic oxidation tank 11, and the other end of the discharge pipe 13 is connected to the next treatment unit.

[0037] The reflux unit 2 includes a gas-liquid mixing pump 21, a first gas-liquid pipe 22, and a second gas-liquid pipe 23; one end of the first gas-liquid pipe 22 is connected to the liquid outlet of the catalytic oxidation tank 11, and the other end of the first gas-liquid pipe 22 is connected to the inlet of the gas-liquid mixing pump 21; one end of the second gas-liquid pipe 23 is connected to the outlet of the gas-liquid mixing pump 21; in this embodiment, the gas-liquid mixing pump 21 adopts an ozone-resistant mixing pump commonly used in the art;

[0038] The water-gas high-frequency cutting air dissolving unit 3 includes a plurality of water-gas high-frequency cutting air dissolvers 31 connected in series. During the use of the reagent, the number of the water-gas high-frequency cutting air dissolvers 31 is 2-6, and the total length of a single water-gas high-frequency cutting air dissolver 31 is 5-100 cm; the water-gas high-frequency cutting air dissolver 31 includes a shell 311 and a hollow column 312; wherein, the upper end of the shell 311 is provided with a water inlet channel 3111 connected to the other end of the second gas-liquid pipe 23, and the water inlet channel 3111 is an inclined channel structure with a high head end and a low tail end, and a water outlet channel 3112 is provided at the bottom of the shell 311; the hollow column 312 is a pipe structure with an open top and a hollow interior. The opening at the top of the hollow column 312 forms an air inlet channel 3121. The lower end of the hollow column 312 extends into the interior of the housing 311. A plurality of jet holes 3122 are formed on the outer wall of the portion of the hollow column 312 located within the housing 311. The aperture of the jet holes 3122 is 1.0-10.0 mm. A plurality of guide plates 313 are fixedly installed on the outer wall of the portion of the hollow column 312 located within the housing 311. The plurality of guide plates 313 are sequentially connected to form a spiral plate structure. The spacing between two guide plates 313 is 10-100 mm.

[0039] The pressurizing unit 4 includes an ozone generator 41, a gas compressor 42, an ozone connecting pipe 43, and an ozone tube 44. One end of the ozone connecting pipe 43 is connected to the outlet of the ozone generator 41, and the other end of the ozone connecting pipe 43 is connected to the inlet of the gas compressor 42. One end of the ozone tube 44 is connected to the outlet of the gas compressor 42, and the other end of the ozone tube 44 is connected to the air inlet passage 3121. In this embodiment, the gas compressor 42 is an ozone corrosion-resistant compressor commonly used in the art.

[0040] The release unit 5 includes a pressure relief pipe 51, and a pressure regulating valve 52 and a check valve 53 assembled in series on the pressure relief pipe 51. The inlet end of the pressure relief pipe 51 is connected to the water outlet channel 3112, and the outlet end of the pressure relief pipe 51 is connected to the return liquid port of the catalytic oxidation tank 11.

[0041] like Figure 2 As shown, in this embodiment, the sewage inlet pipe 12, the discharge pipe 13, the first gas-liquid pipe 22, the second gas-liquid pipe 23, the ozone connecting pipe 43 and the ozone pipe 44 are all equipped with solenoid valves.

[0042] Its solenoid valve and pipeline can also be provided by the manufacturer. In addition, the circuits, electronic components and modules involved in the present invention are all existing technologies and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to the internal structure and methods.

[0043] Example 2

[0044] like Figure 1-Figure 3As shown, this embodiment provides a method for treating sewage using the ozone catalytic oxidation system based on water vapor high-frequency cutting dissolved air in Example 1, comprising the following steps:

[0045] S1, the sewage to be treated enters the catalytic oxidation unit 1, and the sewage contacts and mixes with the catalytic oxidation filler containing hydroxyl radicals in the catalytic oxidation tank 11 to achieve preliminary treatment of organic pollutants in the sewage to be treated, and then enters the reflux unit 2;

[0046] S2. The sewage after the preliminary treatment in step S1 is introduced into the gas-liquid mixing pump 21 through the first gas-liquid pipe 22. The water pressure is increased to 0.1-1.0 MPa by the gas-liquid mixing pump 21. The sewage after the pressure-boosting treatment then enters the water-gas high-frequency cutting and dissolving unit 3 through the second gas-liquid pipe 23.

[0047] S3, ozone connecting pipe 43 passes ozone generated by ozone generator 41 into gas compressor 42, gas compressor 42 increases ozone pressure to 0.1-1.0Mpa, and then transported to water gas high frequency cutting dissolved gas unit 3 through ozone pipe 44;

[0048] S4. The sewage entering from the water inlet channel 3111 forms a vortex under the action of the internal guide plate 313. Under this flow state, the sewage flow rate is high and turbulent, the collision between molecules is more frequent, and the mass transfer efficiency is greatly improved. After the pressurized ozone enters the hollow column 312 from the air inlet channel 3121, it is cut along the tangent direction of the water flow through the jet air hole 3122 under the action of pressure and injected into the high-speed vortex sewage. Under the action of high pressure, high-frequency disturbance is formed on the sewage, so that the two are quickly dissolved, and the dissolution improves the gas-liquid mass transfer efficiency, forming a highly mixed vortex gas-liquid mixed fluid, which then enters the release unit 5; when operating in series, the sewage enters the water outlet channel 3112 of the water-gas high-frequency cutting dissolver 31 through the pipeline into the water inlet channel 3111 of the next water outlet channel 3112, and the mass transfer effect and ozone utilization rate are repeatedly improved. Due to the full dissolution of ozone and the high fluid flow rate, the mass transfer efficiency is greatly improved compared with traditional pipeline mixing, and the ozone utilization rate and overall oxidation effect are improved;

[0049] S5. The gas-liquid mixed fluid generated in step S4 enters the pressure relief pipe 51 through the water outlet channel 3112, and then the pressure is reduced by the pressure regulating valve 52, so that the ozone in the gas-liquid mixed fluid forms ultra-fine bubbles. Then, the effluent of the release unit 5 is returned to the catalytic oxidation tank 11, and the catalytic oxidation filler is used to generate hydroxyl radicals for oxidation to remove the remaining organic pollutants, thereby reducing COD again. A part of the effluent after the reaction is returned for secondary removal of pollutants, and the rest is directly discharged or enters the next treatment unit; the gas-liquid mixed fluid releases pressure in the release unit 5, so that the ozone in the gas-liquid mixed fluid releases an appropriate amount of pressure to form ozone ultra-fine bubbles, while avoiding causing the high-pressure water body to cause a large disturbance to the next process.

[0050] The present invention integrates the system structure and optimizes the process methods of ozone catalytic oxidation technology to solve the problems of low ozone solubility rate, low solubility concentration, low mass transfer efficiency, and low ozone utilization rate in existing ozone catalytic oxidation technology, further improves the ozone utilization rate and reaction rate of ozone catalytic oxidation treatment technology, reduces treatment costs, and improves treatment effects.

[0051] Example 3

[0052] In one embodiment of the present invention, the influent COD is 80 mg / L, the residence time is 1 hour, the ozone pressure is 0.35 MPa, and the water pressure is 0.25 MPa. The water-gas high-frequency cutting aerator 31 is 30 cm long, the guide plates 313 are spaced 0.5 cm apart, the jet holes 3122 of the hollow column 312 have a diameter of 2 mm, and the number of cascaded holes is two.

[0053] During the measurement operation, the ozone concentration in the sewage was 20% and the ozone solubility rate was 98%.

[0054] Example 4

[0055] This example uses the above invention method to treat sewage and compares it with a traditional ozone catalytic oxidation process device. Industrial tail water is treated. The two sets of devices use the same operating parameters, the same catalyst, and the same inlet water source to examine the removal of COD.

[0056] The effluent from the biochemical secondary sedimentation tank of an industrial sewage plant whose main influent source is printing and dyeing wastewater is used as the influent for this embodiment. The sewage residence time is 1 hour, an aluminum-based catalyst is used, the ozone dosage is 10 g, and the ozone generated by the ozone generator 41 is pressurized to 0.3 MPa by the pressurizing unit 4. The sewage pressure is increased to 0.2 MPa by the gas-liquid mixing pump 21. After entering the water-gas high-frequency cutting dissolver 31, a large amount of ultra-fine ozone bubbles are dissolved in the water. After the release of hydroxyl radicals under the action of the catalyst, the organic matter in the sewage is oxidized and degraded. The influent and effluent are taken for COD determination.

[0057] At the same time, the traditional ozone catalytic oxidation process is used to dissolve the air in the aeration plate. The same catalyst, the same operating parameters, and the same inlet water source are used for treatment, and the inlet and outlet water are taken for measurement.

[0058] The two devices were operated for several days, and the inlet and outlet water quality ranges and calculations are shown in Table 1.

[0059] Table 1 Inlet and outlet water quality range and calculation structure

[0060]

[0061] In this embodiment, the ozone catalytic oxidation system COD crThe average removal rate is increased by more than 15%, the ozone dosage is saved by 42% compared with the traditional aeration disc dissolved gas method, and the operation and maintenance cost is saved by 0.2 yuan / ton of water compared with the microporous aeration disc dissolved gas method, and the application has better treatment effect and economic benefit.

[0062] Example 5

[0063] In an embodiment of the application, a tail gas collecting pipeline is arranged above the catalytic oxidation tank 11 and connected to a tail gas destroyer.

[0064] In the application, the partial pressure of ozone gas is increased by increasing the ozone pressure, the upper limit of ozone dissolution in the system is increased, the ozone dissolution rate is increased, and the jet ozone gas formed cuts the high-speed rotating flow in the tangential direction of the water flow at a high frequency, accelerates the diffusion of ozone in the sewage, makes the dissolved ozone more uniform in the sewage, and reduces the gas escape. The reaction system in the application is carried out under the conditions of high pressure, high flow rate and high mixing, the mass transfer efficiency is higher than that of the traditional pipeline mixing, the cutting frequency and speed can be controlled by adjusting the water pressure and gas pressure, the reaction rate is greatly improved, and the residence time is reduced. In the application, the dissolved ozone is improved under the action of pressure, rotating flow and gas cutting, the collision frequency and collision rate of the dissolved ozone and the organic pollutants in the sewage are increased, the mass transfer efficiency is improved, the reaction is more sufficient, the ozone utilization rate is improved, the same ozone dosage can be more fully dissolved and reacted in the system, a higher dissolution rate is achieved, compared with the traditional ozone catalytic oxidation technology, the ozone and water in the application have better oxidation effect on the organic pollutants, the higher ozone utilization rate and faster reaction rate effectively save the ozone dosage, system operation energy consumption and equipment occupation, compared with the traditional ozone catalytic oxidation process, the application effectively reduces the sewage treatment cost and has better economic benefit.

[0065] The application discloses the preferred embodiments, but is not limited thereto, and those skilled in the art can easily understand the spirit of the application according to the above embodiments, and make different inferences and changes, as long as they do not deviate from the spirit of the application, they are within the protection scope of the application.

Claims

1. An ozone catalytic oxidation system based on high-frequency cutting of dissolved gas by water vapor, characterized in that: include: A catalytic oxidation unit (1) comprises a catalytic oxidation tank (11), wherein a catalytic oxidation filler is provided in the catalytic oxidation tank (11); A reflux unit (2) comprising a gas-liquid mixing pump (21), a first gas-liquid pipe (22), and a second gas-liquid pipe (23); wherein one end of the first gas-liquid pipe (22) is connected to the liquid outlet of the catalytic oxidation tank (11), and the other end of the first gas-liquid pipe (22) is connected to the inlet of the gas-liquid mixing pump (21); and one end of the second gas-liquid pipe (23) is connected to the outlet of the gas-liquid mixing pump (21); The water-gas high-frequency cutting air dissolving unit (3) comprises a plurality of water-gas high-frequency cutting air dissolving devices (31) connected in series, wherein the water-gas high-frequency cutting air dissolving devices (31) comprise a shell (311) and a hollow column (312); wherein the upper end of the shell (311) is provided with a water inlet channel (3111) connected to the other end of the second gas-liquid pipe (23); and the bottom of the shell (311) is provided with a water outlet channel (3112); and the hollow column (312) is a pipe structure with an open top and a hollow interior. The opening at the top end of the hollow column (312) forms an air inlet channel (3121); the lower end of the hollow column (312) extends into the interior of the shell (311); and a plurality of jet air holes (3122) are provided on the outer wall of the portion of the hollow column (312) located within the shell (311); a plurality of guide plates (313) are fixedly provided on the outer wall of the portion of the hollow column (312) located within the shell (311); and the plurality of guide plates (313) are sequentially connected to form a spiral plate structure; A pressurizing unit (4) comprising an ozone generator (41), a gas compressor (42), an ozone connecting pipe (43), and an ozone tube (44); one end of the ozone connecting pipe (43) is connected to the outlet end of the ozone generator (41), and the other end of the ozone connecting pipe (43) is connected to the inlet end of the gas compressor (42); one end of the ozone tube (44) is connected to the outlet end of the gas compressor (42), and the other end of the ozone tube (44) is connected to the air inlet channel (3121); A release unit (5) comprising a pressure relief pipe (51), and a pressure regulating valve (52) and a check valve (53) sequentially mounted in series on the pressure relief pipe (51), wherein the inlet end of the pressure relief pipe (51) is in communication with the water outlet channel (3112), and the outlet end of the pressure relief pipe (51) is in communication with the liquid return port of the catalytic oxidation tank (11); The aperture of the jet air hole (3122) is 1.0-10.0 mm; the distance between two adjacent guide plates (313) is 10-100 mm; The sewage is introduced into the gas-liquid mixing pump (21) through the first gas-liquid pipe (22), and the water pressure is increased to 0.1-1.0 MPa under the action of the gas-liquid mixing pump (21). The sewage after the pressure-boosting treatment then enters the water-gas high-frequency cutting dissolved gas unit (3) through the second gas-liquid pipe (23); the ozone connecting pipe (43) passes the ozone generated by the ozone generator (41) into the gas compressor (42), and the gas compressor (42) increases the ozone pressure to 0.1-1.0 MPa, and then is transported to the water-gas high-frequency cutting dissolved gas unit (3) through the ozone pipe (44).

2. The ozone catalytic oxidation system based on water vapor high frequency cutting dissolved gas according to claim 1 is characterized in that: The water inlet channel (3111) is an inclined channel structure with a high head end and a low tail end.

3. The ozone catalytic oxidation system based on water vapor high frequency cutting of dissolved gas according to claim 1, characterized in that: The number of the water-gas high-frequency cutting aerators (31) is 2-6, and the total length of a single water-gas high-frequency cutting aerator (31) is 5-100 cm.

4. The ozone catalytic oxidation system based on water vapor high frequency cutting dissolved gas according to claim 1 is characterized in that: The catalytic oxidation unit (1) further comprises a sewage inlet pipe (12) and a discharge pipe (13); the outlet end of the sewage inlet pipe (12) is connected to the sewage inlet of the catalytic oxidation tank (11); one end of the discharge pipe (13) is connected to the discharge port of the catalytic oxidation tank (11), and the other end of the discharge pipe (13) is connected to the next treatment unit.

5. The ozone catalytic oxidation system based on water vapor high frequency cutting of dissolved gas according to claim 4, characterized in that: The sewage inlet pipe (12), the discharge pipe (13), the first gas-liquid pipe (22), the second gas-liquid pipe (23), the ozone connecting pipe (43) and the ozone pipe (44) are all equipped with solenoid valves.

6. A method for treating sewage using the ozone catalytic oxidation system based on water vapor high frequency cutting dissolved gas as claimed in claim 1, characterized in that: The following steps are involved: S1, the sewage to be treated enters the catalytic oxidation unit (1), the sewage contacts and mixes with the catalytic oxidation filler containing hydroxyl radicals in the catalytic oxidation tank (11), thereby achieving preliminary treatment of organic pollutants in the sewage to be treated, and then enters the reflux unit (2); S2. The sewage after the preliminary treatment in step S1 is introduced into the gas-liquid mixing pump (21) through the first gas-liquid pipe (22). The water pressure is increased to 0.1-1.0 MPa under the action of the gas-liquid mixing pump (21). The sewage after the pressure-boosting treatment then enters the water-gas high-frequency cutting and dissolving unit (3) through the second gas-liquid pipe (23); S3, the ozone connecting pipe (43) passes the ozone generated by the ozone generator (41) into the gas compressor (42), the gas compressor (42) increases the ozone pressure to 0.1-1.0 MPa, and then transports it to the water-gas high-frequency cutting dissolved gas unit (3) through the ozone pipe (44); S4. The sewage entering from the water inlet channel (3111) forms a vortex under the action of the internal guide plate (313). After the pressurized ozone enters the hollow column (312) from the air inlet channel (3121), it is cut through the jet air hole (3122) along the tangent direction of the water flow under the action of pressure and injected into the high-speed vortex sewage. Under the action of high pressure, high-frequency disturbance is formed on the sewage, causing the two to dissolve quickly, forming a highly mixed vortex gas-liquid mixed fluid, and then enters the release unit (5); S5. The gas-liquid mixed fluid generated in step S4 enters the pressure relief pipe (51) through the water outlet channel (3112), and then the pressure is reduced by the pressure regulating valve (52), so that the ozone in the gas-liquid mixed fluid forms ultra-fine bubbles. Then, the effluent of the release unit (5) is returned to the catalytic oxidation tank (11), and the hydroxyl radicals generated by the catalytic oxidation filler are oxidized to remove the remaining organic pollutants, thereby reducing the COD again. A part of the effluent after the reaction is returned for secondary pollutant removal, and the rest is directly discharged or enters the next treatment unit.

7. The method for treating sewage using an ozone catalytic oxidation system based on high-frequency water vapor cutting of dissolved air as claimed in claim 6, characterized in that: In step S2, the water pressure is increased to 0.15-0.5 MPa under the action of the gas-liquid mixing pump (21).

8. The method for treating sewage using an ozone catalytic oxidation system based on high-frequency water vapor cutting of dissolved air as claimed in claim 6, characterized in that: In step S3, the gas compressor (42) increases the ozone pressure to 0.15-0.5 MPa.

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