Catalytic ozonation reactor, system and method for high-salinity wastewater

Abstract

The invention discloses a catalytic ozonation reactor, system and method for high-salinity wastewater, relates to the technical field of sewage treatment, and particularly relates to a catalytic ozonation reactor, system and method for high-salinity wastewater. The water inlet distributor is connected with a water inlet pipeline extending out of the tank body, a breathing opening is further formed in the top of the tank body, and a water production pipeline and an ozone inlet device are arranged at the bottom of the tank body; a liquid secondary distributor, a catalyst bed and a gas secondary distributor are sequentially and fixedly arranged in the tank body from top to bottom; according to the invention, incoming water is sprayed out at an included angle of 5-10 degrees with the tangential direction, so that the whole water flow is ensured to flow from top to bottom in a micro internal rotation manner, 'disturbance 'rather than'floating' of a catalyst is ensured to the greatest extent, and rapid reaction is facilitated, so that the COD removal rate can be greatly improved on the premise of greatly reducing the investment and energy consumption of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to an ozone catalytic oxidation reactor, system and method for high-salinity wastewater. Background Art

[0002] Advanced oxidation technology (AOP) refers to a technology with an oxidizing capacity exceeding that of all common oxidants or an oxidation potential close to or reaching the level of hydroxyl radicals •OH, which can undergo a series of free radical chain reactions with organic pollutants, thereby destroying their structure and gradually degrading them into harmless low-molecular-weight organic matter, and finally degrading them into CO2, H2O and other mineral salts.

[0003] Hydrogen peroxide and ozone are commonly used AOP oxidants. Hydrogen peroxide generates hydroxyl radicals through the Fenton method, but the homogeneous catalyst used has problems such as using too much reagent and difficult recycling, which can easily cause secondary pollution. Traditional ozone oxidation technology has the disadvantages of strong selectivity of direct reaction between ozone molecules and organic matter, low reaction rate constant, and the inability to quickly and completely oxidize and remove difficult-to-degrade pollutants, making it difficult to achieve the best treatment effect. The ozone catalytic oxidation technology developed on this basis uses ozone gas as an oxidant and uses a catalyst to promote the decomposition of ozone to generate •OH for free radical reaction to remove COD in wastewater. The process is simple and it is an advanced oxidation technology with a wide range of applications.

[0004] Ozone catalytic oxidation technology can convert ozone in aqueous solution into hydroxyl radicals (•OH) with higher oxidation potential through the action of catalysts. •OH reacts with most organic matter almost non-selectively, and the reaction rate is between 106 and 1010 mol·L -1 •s -1 The reaction rate of ozone with organic matter is nearly 7 orders of magnitude higher than that of ozone, overcoming the shortcomings of single ozone oxidation and becoming a new advanced oxidation technology with more practical value. However, one problem with ozone catalytic oxidation technology is that it has low solubility in water and decomposes quickly. The current wastewater treatment efficiency of the devices is generally low and the energy consumption is high. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an ozone catalytic oxidation reactor, system and method for high-salt wastewater. The present invention can significantly improve the COD removal rate while significantly reducing the investment and energy consumption of the device.

[0006] The present invention discloses an ozone catalytic oxidation reactor for high-salinity wastewater, comprising a tank body, wherein a water inlet distributor is arranged at the upper part of the tank body, a water inlet pipe extending out of the tank body is connected to the water inlet distributor, a breathing port is arranged at the top of the tank body, and a water production pipe and an ozone inlet device are arranged at the bottom of the tank body; The inside of the tank is fixedly provided with a liquid secondary distributor, a catalyst bed, and a gas secondary distributor in sequence from top to bottom, the ozone inlet device is arranged below the gas secondary distributor, and a catalyst layer is arranged on the catalyst bed; The liquid secondary distributor and the gas secondary distributor are both grid-shaped, the aperture of the liquid secondary distributor is larger than the aperture of the gas secondary distributor, and the aperture of the gas secondary distributor is smaller than the particle size of the catalyst; The water inlet distributor comprises a water inlet nozzle, and the water inlet nozzle sprays water in a direction with a tangential angle of 5-10 degrees with the tank body.

[0007] Preferably, the ozone inlet device comprises an ozone inlet pipe and an ozone interface distributor, wherein the ozone inlet pipe extends from the bottom of the shell into the shell and is connected to the ozone interface distributor fixedly arranged in the tank body; The ozone interface distributor comprises a hollow shell, one end of the shell is provided with a carrier gas liquid inlet for the carrier gas liquid to enter, the other end of the shell is provided with a gas-liquid mixing outlet, the diameter of the middle part of the shell is smaller than the diameter of the two ends of the shell, the middle part of the shell is fixed and sealed with a gas hood, and the sealing area between the gas hood and the shell is connected to the ozone inlet pipe; Air inlet holes are evenly distributed on the shell body at one side of the carrier gas liquid inlet and close to the middle of the shell body, and the air inlet holes are all located in the gas cover.

[0008] Preferably, the diameter of the air inlet holes is 1-1.5 mm, and the hole spacing is 5 mm.

[0009] Preferably, the water inlet distributor includes a water inlet pipe and a main ring pipe, the main ring pipe is fixedly connected to the inner wall of the shell, the water inlet pipe is connected to the main ring pipe after extending into the shell, and a plurality of water distribution pipes are evenly distributed on the inner ring surface of the main ring pipe along the circumferential direction of the ring where the main ring pipe is located, and the water distribution pipes are each provided with the water inlet nozzle at one end away from the main ring pipe.

[0010] Preferably, the catalyst is a porous metal-supported catalyst with a particle size of 50-1000 microns.

[0011] Preferably, the liquid secondary distributor and the gas secondary distributor are both grid-shaped distributors made of 2205 duplex stainless steel.

[0012] An ozone catalytic oxidation system for high-salinity wastewater, comprising an ozone catalytic oxidation reactor for high-salinity wastewater, wherein the ozone catalytic oxidation reactor for high-salinity wastewater is arranged in two stages, namely, a primary reactor and a secondary reactor; The water inlet distributor on the primary reactor is connected to the high-salt wastewater from the front end through a high-concentration brine delivery pump, and the ozone inlet pipe on the primary reactor is connected to an ozone generator. The primary reactor is connected to the water production pool through the secondary reactor, the water production pipeline of the primary reactor is connected to the water inlet distributor on the secondary reactor through the intermediate pipeline, the intermediate pipeline is provided with an intermediate water pump and a water inlet regulating valve, the primary reactor is provided with a liquid level transmitter for monitoring the liquid level in the primary reactor, and the liquid level transmitter is connected to the water inlet regulating valve; The ozone inlet pipe on the secondary reactor is also connected to the ozone generator, and the water production pipeline of the secondary reactor is connected to the water production pool through a U-shaped tube that controls the liquid level in the connected reactor; It also includes a carrier gas water pump, the water production pool is connected to a reflux pipe through the carrier gas water pump, one end of the reflux pipe is connected to the carrier gas water pump, and the other end of the reflux pipe is connected to the carrier gas liquid inlet on the ozone interface distributor of the primary reactor and the secondary reactor through a branch pipe.

[0013] An ozone catalytic oxidation method for high-salinity wastewater, using an ozone catalytic oxidation system for high-salinity wastewater to perform ozone catalytic oxidation of high-salinity wastewater, the method comprising the following steps: The high-salinity wastewater from the front end is pressurized to 0.2~0.25MPAG by a high-concentration brine delivery pump and sent to the primary reactor through the water inlet distributor on the primary reactor. Under the action of the water inlet nozzle spraying water in a direction with a tangential angle of 5-10 degrees with the tank body, the high-salinity wastewater swirls downward from top to bottom, passing through the liquid secondary distributor, the catalytic layer, and the gas secondary distributor in turn; The ozone mixed gas with a mass concentration of not less than 10% produced by the ozone generator enters the bottom of the shell of the primary reactor through the ozone inlet device, and passes through the liquid secondary distributor, the catalyst layer, and the gas secondary distributor from bottom to top in sequence; High-salinity wastewater and ozone undergo ozone catalytic oxidation reaction in the catalyst bed. Due to the relationship between catalyst particles and two-phase flow, the reaction process is a disturbed state, which is more conducive to the rapid progress of the reaction. The remaining air or oxygen after the reaction is discharged from the breathing port on the top of the primary reactor. The produced water of the primary reactor enters the secondary reactor through the intermediate water pump and the water inlet regulating valve. Under the action of the water inlet nozzle spraying water in the direction of the tangential angle of 5-10 degrees with the tank body, the high-salinity wastewater swirls downward from the top and passes through the liquid secondary distributor, the catalyst layer, and the gas secondary distributor in turn; The ozone mixed gas enters the bottom of the shell of the secondary reactor through the ozone inlet device, and passes through the gas secondary distributor, the catalyst layer, and the liquid secondary distributor from bottom to top; The high-salt wastewater and ozone entering the secondary reactor undergo ozone catalytic oxidation reaction in the catalyst bed. Due to the relationship between the catalyst particles and the two-phase flow state, the reaction process is a disturbed state, which is more conducive to the rapid progress of the reaction. The remaining air or oxygen after the reaction is discharged from the breathing port on the top of the secondary reactor, and the produced water enters the water production pool; Part of the water in the water production pool enters the carrier gas water pump and flows back to the primary reactor and the secondary reactor through the ozone interface distributors in the primary reactor and the secondary reactor.

[0014] The present invention sprays water at an angle of 5-10 degrees to the tangential direction, ensuring that the overall water flow flows from top to bottom in a slightly internal rotation, while strengthening the reaction mass transfer, providing a downward centrifugal force for the catalyst particles, maximizing the guarantee that the catalyst is "disturbed" rather than "floating", the ozone mixed gas flows from bottom to top, the wastewater flows from top to bottom, and the ozone catalytic oxidation reaction occurs in the catalyst bed. Due to the relationship between the catalyst particles and the two-phase flow state, the reaction process is a disturbed state, which is more conducive to the rapid progress of the reaction, thereby significantly improving the COD removal rate under the premise of significantly reducing the investment and energy consumption of the device.

[0015] Compared with the current mainstream ozone catalytic oxidation technology, the present invention has the advantages of high COD removal rate, low energy consumption, low investment cost, and wide application range. Taking the COD treatment of high-salt (TDS not less than 30,000 mg / L) wastewater from coal chemical industry as an example, the COD removal rate of this technology can reach more than 65%, O3 / COD is as low as below 1.8, the reaction residence time does not exceed 2 hours, and the comprehensive investment cost of the device is more than 20% lower than the mainstream, and it can be applied to the removal of COD in high-salt wastewater in various industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an ozone catalytic oxidation reactor for high-salinity wastewater.

[0017] Figure 2 Schematic diagram of the water inlet distributor.

[0018] Figure 3 The present invention is a schematic diagram of the structure of an embodiment of an ozone catalytic oxidation system for high-salinity wastewater.

[0019] Figure 4 Schematic diagram of the ozone interface distributor structure.

[0020] Figure numerals: 1-primary reactor, 2-secondary reactor, 3-ozone generator, 4-water production pool, 5-liquid level transmitter, 6-water inlet regulating valve, 7-U-tube, 11-water inlet distributor, 22-liquid secondary distributor, 33-catalyst layer, 44-gas secondary distributor, 55-ozone interface distributor, 66-water production pipe, 77-main ring pipe, 88-water distribution pipe, 99-water inlet nozzle, 101-carrier gas water pump, 102-gas hood, 103-carrier gas liquid inlet, 104-gas-liquid mixing outlet, 105-ozone air inlet pipe, 106-air inlet hole. DETAILED DESCRIPTION

[0021] The present invention discloses an ozone catalytic oxidation reactor for high-salinity wastewater, comprising a tank body, wherein a water inlet distributor 11 is arranged at the upper part of the tank body, a water inlet pipe extending out of the tank body is connected to the water inlet distributor 11, a breathing port is arranged at the top of the tank body, and a water production pipe 66 and an ozone inlet device are arranged at the bottom of the tank body; The inside of the tank is fixedly provided with a liquid secondary distributor 22, a catalyst bed, and a gas secondary distributor 44 in sequence from top to bottom, the ozone inlet device is arranged below the gas secondary distributor 44, and a catalyst layer 33 is arranged on the catalyst bed; The liquid secondary distributor 22 and the gas secondary distributor 44 are both grid-shaped, the aperture of the liquid secondary distributor 22 is larger than the aperture of the gas secondary distributor 44, and the aperture of the gas secondary distributor 44 is smaller than the particle size of the catalyst; The water inlet distributor 11 comprises a water inlet nozzle 99, and the water inlet nozzle 99 sprays water in a direction with a tangential angle of 5-10 degrees with the tank body.

[0022] In one embodiment, the ozone inlet device includes an ozone inlet pipe 105 and an ozone interface distributor 55, wherein the ozone inlet pipe 105 extends from the bottom of the shell into the shell and is connected to the ozone interface distributor 55 fixedly arranged in the tank body; The ozone interface distributor 55 comprises a hollow shell, one end of which is provided with a carrier gas liquid inlet 103 for the carrier gas liquid to enter, and the other end of the shell is provided with a gas-liquid mixing outlet 104, the diameter of the middle part of the shell is smaller than the diameter of the two ends of the shell, and the middle part of the shell is fixed and sealed with a gas cover 102, and the sealing area between the gas cover 102 and the shell is connected to the ozone inlet pipe 105; Air inlet holes 106 are evenly distributed on the shell body at one side of the carrier gas and liquid inlet 103 and close to the middle of the shell body. The air inlet holes 106 are all located in the gas cover 102 .

[0023] The diameter of the air inlet hole 106 is 1-1.5 mm, and the hole spacing is 5 mm.

[0024] In one embodiment, the water inlet distributor 11 includes a water inlet pipe and a main ring pipe 77, wherein the main ring pipe 77 is fixedly connected to the inner wall of the shell, and the water inlet pipe is connected to the main ring pipe 77 after being extended into the shell. A plurality of water distribution pipes 88 are evenly distributed on the inner ring surface of the main ring pipe 77 along the circumferential direction of the ring where the main ring pipe 77 is located, and the water distribution pipes 88 are each provided with the water inlet nozzle 99 at one end away from the main ring pipe 77.

[0025] The catalyst is a porous metal-supported catalyst with a particle size of 50-1000 microns.

[0026] The liquid secondary distributor 22 and the gas secondary distributor 44 are both grid-shaped distributors made of 2205 duplex stainless steel.

[0027] An ozone catalytic oxidation system for high-salinity wastewater, comprising an ozone catalytic oxidation reactor for high-salinity wastewater, wherein the ozone catalytic oxidation reactor for high-salinity wastewater is arranged in two stages, namely, a primary reactor 1 and a secondary reactor 2; The water inlet distributor 11 on the primary reactor 1 is connected to the high-salinity wastewater from the front end through a high-concentration brine delivery pump, and the ozone inlet pipe 105 on the primary reactor 1 is connected to the ozone generator 3. The primary reactor 1 is connected to the water production pool 4 through the secondary reactor 2. The water production pipe 66 of the primary reactor 1 is connected to the water inlet distributor 11 on the secondary reactor 2 through an intermediate pipeline. The intermediate pipeline is provided with an intermediate water pump and a water inlet regulating valve 6. The primary reactor 1 is provided with a liquid level transmitter 5 for monitoring the liquid level in the primary reactor 1. The liquid level transmitter 5 is connected to the water inlet regulating valve 6. The ozone inlet pipe 105 on the secondary reactor 2 is also connected to the ozone generator 3, and the water production pipe 66 of the secondary reactor 2 is connected to the water production pool 4 through a U-shaped pipe 7 that controls the liquid level in the connected reactor; It also includes a carrier gas water pump 101. The water production pool 4 is connected to a reflux pipe through the carrier gas water pump 101. One end of the reflux pipe is connected to the carrier gas water pump 101, and the other end of the reflux pipe is connected to the carrier gas liquid inlet 103 on the ozone interface distributor 55 of the primary reactor 1 and the secondary reactor 2 through a branch pipe.

[0028] An ozone catalytic oxidation method for high-salinity wastewater, using an ozone catalytic oxidation system for high-salinity wastewater to perform ozone catalytic oxidation of high-salinity wastewater, the method comprising the following steps: The high-salinity wastewater from the front end is pressurized to 0.2-0.25 MPAG by a high-concentration brine delivery pump and delivered to the primary reactor 1 through the water inlet distributor 11 on the primary reactor 1. Under the action of the water inlet nozzle 99 spraying water in a direction with a tangential angle of 5-10 degrees with the tank body, the high-salinity wastewater swirls downward from the top and passes through the liquid secondary distributor 22, the catalyst layer, and the gas secondary distributor 44 in sequence; The ozone mixed gas with a mass concentration of not less than 10% produced by the ozone generator 3 enters the bottom of the shell of the primary reactor 1 through the ozone inlet device, and passes through the liquid secondary distributor 22, the catalyst layer, and the gas secondary distributor 44 from bottom to top in sequence; The high-salinity wastewater and ozone undergo an ozone catalytic oxidation reaction in the catalyst bed. Due to the relationship between the catalyst particles and the two-phase flow state, the reaction process is a disturbed state, which is more conducive to the rapid progress of the reaction. The remaining air or oxygen after the reaction is discharged from the breathing port on the top of the primary reactor 1. The produced water of the primary reactor 1 enters the secondary reactor 2 through the intermediate water pump and the water inlet regulating valve 6. Under the action of the water inlet nozzle 99 spraying the incoming water in a direction with a tangential angle of 5-10 degrees with the tank body, the high-salinity wastewater swirls downward from the top and passes through the liquid secondary distributor 22, the catalyst layer, and the gas secondary distributor 44 in sequence; The ozone mixed gas enters the bottom of the shell of the secondary reactor 2 through the ozone inlet device, and passes through the gas secondary distributor 44, the catalyst layer, and the liquid secondary distributor 22 from bottom to top in sequence; The high-salinity wastewater and ozone entering the secondary reactor 2 undergo an ozone catalytic oxidation reaction in the catalyst bed. Due to the relationship between the catalyst particles and the two-phase flow state, the reaction process is a disturbed state, which is more conducive to the rapid progress of the reaction. The remaining air or oxygen after the reaction is discharged from the breathing port at the top of the secondary reactor 2, and the produced water enters the water production pool 4; Part of the water in the water production pool 4 enters the carrier gas water pump 101 and flows back to the primary reactor 1 and the secondary reactor 2 through the ozone interface distributor 55 in the primary reactor 1 and the secondary reactor 2.

[0029] The present invention sprays water at an angle of 5-10 degrees to the tangential direction, ensuring that the overall water flow flows from top to bottom in a slightly internal rotation, while strengthening the reaction mass transfer, providing a downward centrifugal force for the catalyst particles, maximizing the guarantee that the catalyst is "disturbed" rather than "floating", the ozone mixed gas flows from bottom to top, the wastewater flows from top to bottom, and the ozone catalytic oxidation reaction occurs in the catalyst bed. Due to the relationship between the catalyst particles and the two-phase flow state, the reaction process is a disturbed state, which is more conducive to the rapid progress of the reaction, thereby significantly improving the COD removal rate under the premise of significantly reducing the investment and energy consumption of the device.

[0030] Compared with the current mainstream ozone catalytic oxidation technology, the present invention has the advantages of high COD removal rate, low energy consumption, low investment cost, and wide application range. Taking the COD treatment of high-salt (TDS not less than 30,000 mg / L) wastewater from coal chemical industry as an example, the COD removal rate of this technology can reach more than 65%, O3 / COD is as low as below 1.8, the reaction residence time does not exceed 2 hours, and the comprehensive investment cost of the device is more than 20% lower than the mainstream, and it can be applied to the removal of COD in high-salt wastewater in various industries.

[0031] The high-salt wastewater from outside the boundary area is first delivered to the primary reactor 1 through a high-concentration brine delivery pump. Two high-concentration brine delivery pumps can be set up, with one in use and one in reserve. The annual continuous operation time is usually not less than 8400h, and the delivery pressure of the high-concentration brine delivery pump is generally not less than 0.25MPAG to ensure the required water inlet pressure of the reactor.

[0032] The primary ozone catalytic reactor is connected to the high-concentration brine delivery pump by a pipeline. The pipeline material selection must meet the anti-corrosion and strength requirements. The incoming water enters the main ring pipe 77 at a speed of no more than 1.5m / s, and then enters the water distribution pipe 88 at a speed of 3m / s, and is ejected from the expanded port at a tangential angle of 5-10 degrees. The flow rate of the water distribution pipe 88 is usually no more than 15m 3 / h; the overall flow rate of wastewater entering the reactor is 15-30m / h, the volume of the static catalyst bed is 0.7-1 times the reactor inlet flow rate, and the design volume of the disturbed catalyst bed is 1-1.3 times the reactor inlet flow rate; the wastewater contacts and reacts with the ozone bubbles in the catalyst area, and after the reaction, the wastewater is discharged from the bottom and the gas is discharged from the top. The operating pressure of the primary reactor 1 is 0.05-0.01MPaG; multiple ozone interface distributors 55 can be provided, and a single one meets the requirement of water inlet of no more than 30m 3 / h water supply, ozone concentration should not be less than 120g / L; The produced water of the primary reactor 1 is delivered to the secondary reactor 2 through the intermediate water pump, and the reaction liquid level of the primary reactor 1 is controlled by the inlet regulating valve 6 of the secondary reactor 2 and the liquid level transmitter 5 of the primary reactor 1; In order to control the outlet water level of the secondary reactor 2, an inverted U-shaped pipe 7 is set at the outlet water. The top height of the pipe is the same as the required liquid level of the reactor. An exhaust valve is set at the top of the pipe, and exhaust is required during start-up.

Claims

1. An ozone catalytic oxidation reactor for high-salinity wastewater, comprising a tank body, characterized in that: The upper part of the tank body is provided with a water inlet distributor, the water inlet distributor is connected with a water inlet pipe extending out of the tank body, the top of the tank body is also provided with a breathing port, and the bottom of the tank body is provided with a water production pipe and an ozone inlet device; The inside of the tank is fixedly provided with a liquid secondary distributor, a catalyst bed, and a gas secondary distributor in sequence from top to bottom, the ozone inlet device is arranged below the gas secondary distributor, and a catalyst layer is arranged on the catalyst bed; The liquid secondary distributor and the gas secondary distributor are both grid-shaped, the aperture of the liquid secondary distributor is larger than the aperture of the gas secondary distributor, and the aperture of the gas secondary distributor is smaller than the particle size of the catalyst; The water inlet distributor comprises a water inlet nozzle, and the water inlet nozzle sprays water in a direction with a tangential angle of 5-10 degrees with the tank body.

2. An ozone catalytic oxidation reactor for high-salinity wastewater as claimed in claim 1, characterized in that: The ozone inlet device comprises an ozone inlet pipe and an ozone interface distributor. The ozone inlet pipe extends from the bottom of the shell into the shell and is connected to the ozone interface distributor fixedly arranged in the tank body. The ozone interface distributor comprises a hollow shell, one end of the shell is provided with a carrier gas liquid inlet for the carrier gas liquid to enter, the other end of the shell is provided with a gas-liquid mixing outlet, the diameter of the middle part of the shell is smaller than the diameter of the two ends of the shell, the middle part of the shell is fixed and sealed with a gas hood, and the sealing area between the gas hood and the shell is connected to the ozone inlet pipe; Air inlet holes are evenly distributed on the shell body at one side of the carrier gas liquid inlet and close to the middle of the shell body, and the air inlet holes are all located in the gas cover.

3. An ozone catalytic oxidation reactor for high-salinity wastewater as claimed in claim 2, characterized in that: The diameter of the air inlet holes is 1-1.5 mm, and the hole spacing is 5 mm.

4. An ozone catalytic oxidation reactor for high-salinity wastewater as claimed in claim 1, characterized in that: The water inlet distributor includes a water inlet pipe and a main ring pipe, the main ring pipe is fixedly connected to the inner wall of the shell, the water inlet pipe is connected to the main ring pipe after extending into the shell, a plurality of water distribution pipes are evenly distributed on the inner ring surface of the main ring pipe along the circumferential direction of the ring where the main ring pipe is located, and the water distribution pipe is provided with the water inlet nozzle at one end away from the main ring pipe.

5. An ozone catalytic oxidation reactor for high-salinity wastewater as claimed in claim 1, characterized in that: The catalyst is a porous metal-supported catalyst with a particle size of 50-1000 microns.

6. An ozone catalytic oxidation reactor for high-salinity wastewater as claimed in claim 1, characterized in that: The liquid secondary distributor and the gas secondary distributor are both grid-shaped distributors made of 2205 duplex stainless steel.

7. An ozone catalytic oxidation system for high-salinity wastewater, comprising an ozone catalytic oxidation reactor for high-salinity wastewater as claimed in any one of claims 2 to 6, characterized in that: The ozone catalytic oxidation reactor for high-salinity wastewater is configured in two stages, namely a primary reactor and a secondary reactor; The water inlet distributor on the primary reactor is connected to the high-salt wastewater from the front end through a high-concentration brine delivery pump, and the ozone inlet pipe on the primary reactor is connected to an ozone generator. The primary reactor is connected to the water production pool through the secondary reactor, the water production pipeline of the primary reactor is connected to the water inlet distributor on the secondary reactor through the intermediate pipeline, the intermediate pipeline is provided with an intermediate water pump and a water inlet regulating valve, the primary reactor is provided with a liquid level transmitter for monitoring the liquid level in the primary reactor, and the liquid level transmitter is connected to the water inlet regulating valve; The ozone inlet pipe on the secondary reactor is also connected to the ozone generator, and the water production pipeline of the secondary reactor is connected to the water production pool through a U-shaped tube that controls the liquid level in the connected reactor; It also includes a carrier gas water pump, the water production pool is connected to a reflux pipe through the carrier gas water pump, one end of the reflux pipe is connected to the carrier gas water pump, and the other end of the reflux pipe is connected to the carrier gas liquid inlet on the ozone interface distributor of the primary reactor and the secondary reactor through a branch pipe.

8. An ozone catalytic oxidation method for high-salinity wastewater, using an ozone catalytic oxidation system for high-salinity wastewater as claimed in claim 7 to carry out ozone catalytic oxidation of high-salinity wastewater, characterized in that: The method comprises the following steps: The high-salinity wastewater from the front end is pressurized to 0.2~0.25MPAG by a high-concentration brine delivery pump and sent to the primary reactor through the water inlet distributor on the primary reactor. Under the action of the water inlet nozzle spraying water in a direction with a tangential angle of 5-10 degrees with the tank body, the high-salinity wastewater swirls downward from top to bottom, passing through the liquid secondary distributor, the catalytic layer, and the gas secondary distributor in turn; The ozone mixed gas with a mass concentration of not less than 10% produced by the ozone generator enters the bottom of the shell of the primary reactor through the ozone inlet device, and passes through the liquid secondary distributor, the catalyst layer, and the gas secondary distributor from bottom to top in sequence; High-salinity wastewater and ozone undergo ozone catalytic oxidation reaction in the catalyst bed. Due to the relationship between catalyst particles and two-phase flow, the reaction process is a disturbed state, which is more conducive to the rapid progress of the reaction. The remaining air or oxygen after the reaction is discharged from the breathing port on the top of the primary reactor. The produced water of the primary reactor enters the secondary reactor through the intermediate water pump and the water inlet regulating valve. Under the action of the water inlet nozzle spraying water in the direction of the tangential angle of 5-10 degrees with the tank body, the high-salinity wastewater swirls downward from the top and passes through the liquid secondary distributor, the catalyst layer, and the gas secondary distributor in turn; The ozone mixed gas enters the bottom of the shell of the secondary reactor through the ozone inlet device, and passes through the gas secondary distributor, the catalyst layer, and the liquid secondary distributor from bottom to top; The high-salt wastewater and ozone entering the secondary reactor undergo ozone catalytic oxidation reaction in the catalyst bed. Due to the relationship between the catalyst particles and the two-phase flow state, the reaction process is a disturbed state, which is more conducive to the rapid progress of the reaction. The remaining air or oxygen after the reaction is discharged from the breathing port on the top of the secondary reactor, and the produced water enters the water production pool; Part of the water in the water production pool enters the carrier gas water pump and flows back to the primary reactor and the secondary reactor through the ozone interface distributors in the primary reactor and the secondary reactor.

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