Catalytic ozonation reactor and system for high-salinity wastewater

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a catalytic ozonation reactor and system for high-salinity wastewater, which comprises a tank body, a water inlet distributor is arranged at the upper part in the tank body, a water inlet pipeline extending out of the tank body is connected onto the water inlet distributor, and a water outlet pipeline extending out of the tank body is connected onto the water inlet pipeline. A breathing opening is formed in the top of the tank body; 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 utility model, 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, thereby greatly improving the COD removal rate on the premise of greatly reducing the investment and energy consumption of the device.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, concretely relates to a kind of ozone catalytic oxidation reactor, system for high-salinity wastewater. BACKGROUND

[0002] Advanced oxidation technology (AOP) refers to the technology that oxidation ability exceeds all common oxidants or oxidation potential is close to or reaches the level of hydroxyl radical •OH, can carry out series free radical chain reaction with organic pollutants, thereby destroying its structure, making it gradually degraded into harmless low molecular weight organic matter, and finally degraded into CO2, H2O and other mineral salts.

[0003] Hydrogen peroxide and ozone are commonly used AOP oxidants. Hydrogen peroxide generates hydroxyl radicals by Fenton method, but the homogeneous catalyst used has problems such as using more reagents, recovery difficulty, etc., which easily causes secondary pollution. The traditional ozone oxidation technology has the disadvantages of strong selectivity of direct reaction of ozone molecules with organic matter, low reaction rate constant and difficult degradation pollutants cannot be quickly and completely oxidized and removed, etc., and it is difficult to achieve the best treatment effect. On this basis, the developed ozone catalytic oxidation technology uses ozone gas as oxidant, and uses catalyst to promote ozone decomposition to generate •OH for free radical reaction to remove COD in wastewater. The process is simple, and it is a widely used advanced oxidation technology.

[0004] Ozone catalytic oxidation technology can convert ozone in aqueous solution into hydroxyl radical (•OH) with higher oxidation potential through the action of catalyst. •OH almost non-selectively reacts with most organic matter, and the reaction rate is 106~ 1010 mol·L -1 •s -1 , which is nearly 7 orders of magnitude higher than the reaction rate of ozone with organic matter, overcoming the shortcomings of single ozone oxidation, thereby becoming a more practical new advanced oxidation technology. However, the current problem of ozone catalytic oxidation technology is its low solubility in water and fast decomposition. The current device has low efficiency and high energy consumption in wastewater treatment. UTILITY MODEL CONTENTS

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

[0006] The ozone catalytic oxidation reactor for high-salinity wastewater comprises a tank body, a water inlet distributor is arranged at the upper part of the tank body, a water inlet pipeline extending out of the tank body is connected to the water inlet distributor, a breathing port is further arranged at the top of the tank body, a water production pipeline and an ozone gas inlet device are arranged at the bottom of the tank body.

[0007] The tank body is internally sequentially fixed with a liquid secondary distributor, a catalyst bed, and a gas secondary distributor from top to bottom, the ozone gas inlet device is arranged below the gas secondary distributor, and the catalyst bed is provided with a catalyst layer;

[0008] The liquid secondary distributor and the gas secondary distributor are both grid-shaped, the pore size of the liquid secondary distributor is larger than that of the gas secondary distributor, and the pore size of the gas secondary distributor is smaller than the particle size of the catalyst;

[0009] 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.

[0010] Preferably, the ozone gas inlet device comprises an ozone gas inlet pipe and an ozone interface distributor, the ozone gas inlet pipe extends into the shell from the bottom of the shell and is connected to the ozone interface distributor fixedly arranged in the tank body;

[0011] The ozone interface distributor comprises a hollow shell, one end of the shell is provided with a carrier liquid inlet for carrier liquid, 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 diameters of the two ends of the shell, a gas cover is fixedly and sealingly connected to the middle part of the shell, and the sealing area between the gas cover and the shell is connected to the ozone gas inlet pipe;

[0012] The shell located on one side of the carrier liquid inlet and close to the middle part of the shell is uniformly provided with gas inlets, and the gas inlets are all located in the gas cover.

[0013] Preferably, the gas inlets have a diameter of 1-1.5 mm and a spacing of 5 mm.

[0014] Preferably, the water inlet distributor comprises 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 extends into the shell and is connected to the main ring pipe, a plurality of branch pipes are uniformly 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 ends of the branch pipes away from the main ring pipe are provided with the water inlet nozzles.

[0015] Preferably, the catalyst is a porous metal supported catalyst with a particle size of 50-1000 microns.

[0016] Preferably, the liquid secondary distributor and the gas secondary distributor are both grid-shaped distributors made of 2205 duplex stainless steel.

[0017] An ozone catalytic oxidation system for high-salinity wastewater comprises an ozone catalytic oxidation reactor for high-salinity wastewater, which is arranged in two stages, i.e., a primary reactor and a secondary reactor.

[0018] The water distributor on the primary reactor is connected with the high-salt wastewater from the front end by a high-concentration salt water delivery pump, and the ozone inlet pipe on the primary reactor is connected with an ozone generator,

[0019] The primary reactor is connected with the water production tank through the secondary reactor, and the water production pipe of the primary reactor is connected with the water distributor on the secondary reactor through an intermediate pipe, wherein an intermediate water pump and a water inlet adjusting valve are arranged on the intermediate pipe, a liquid level transmitter for monitoring the liquid level in the primary reactor is arranged on the primary reactor, and the liquid level transmitter is connected with the water inlet adjusting valve;

[0020] The ozone inlet pipe on the secondary reactor is also connected with the ozone generator, and the water production pipe of the secondary reactor is connected with the water production tank through a U-shaped pipe for controlling the liquid level in the connected reactor;

[0021] Further, a carrier gas water pump is arranged, and the water production tank is connected with a reflux pipe through the carrier gas water pump, one end of the reflux pipe is connected with the carrier gas water pump, and the other end of the reflux pipe is connected with the carrier gas liquid inlet of the ozone interface distributor on the primary reactor and the secondary reactor through branch pipes, respectively.

[0022] An ozone catalytic oxidation method for high-salt wastewater, which uses an ozone catalytic oxidation system for high-salt wastewater to perform ozone catalytic oxidation on the high-salt wastewater, and the method comprises the following steps:

[0023] The high-salt wastewater from the front end is pressurized to 0.2-0.25 MPAG by a high-concentration salt water delivery pump and is sent to the primary reactor through the water distributor on the primary reactor, and under the action of the water injection nozzle spraying water in a direction with a tangential angle of 5-10 degrees with the tank body, the high-salt wastewater rotates from top to bottom and sequentially passes through the liquid secondary distributor, the catalytic layer and the gas secondary distributor;

[0024] The ozone generator produces ozone mixed gas with a mass concentration of not less than 10%, which enters the bottom of the shell of the primary reactor through the ozone inlet device and sequentially passes through the liquid secondary distributor, the catalytic layer and the gas secondary distributor from bottom to top;

[0025] The high-salt wastewater and the ozone perform ozone catalytic oxidation reaction in the catalyst bed, and due to the relationship between the catalyst particles and the two-phase flow state, the reaction process is in a disturbed state, which is more conducive to the rapid reaction, and the remaining air or oxygen after the reaction is discharged from the breathing port at the top of the primary reactor, and the water production of the primary reactor enters the secondary reactor through the intermediate water pump and the water inlet adjusting valve, and under the action of the water injection nozzle spraying water in a direction with a tangential angle of 5-10 degrees with the tank body, the high-salt wastewater rotates from top to bottom and sequentially passes through the liquid secondary distributor, the catalytic layer and the gas secondary distributor;

[0026] The ozone mixed gas enters the bottom of the shell of the secondary reactor through the ozone inlet device, and sequentially passes through the gas secondary distributor, the catalytic layer and the liquid secondary distributor from bottom to top.

[0027] The high-salinity wastewater and ozone entering the secondary reactor undergo ozone catalytic oxidation reaction in the catalyst bed layer.

[0028] Part of the water in the water production tank enters the carrier gas water pump and is backflowed to the primary reactor and the secondary reactor through the ozone interface distributor in the primary reactor and the secondary reactor.

[0029] The present utility model sprays the incoming water at an angle of 5-10 degrees with the tangent, ensures that the overall water flow flows from top to bottom with a slight internal rotation, strengthens the reaction mass transfer while providing a downward centrifugal force for the catalyst particles, maximizes the guarantee of catalyst "disturbance" rather than "floating", and enables the ozone mixed gas to flow from bottom to top and the wastewater to flow from top to bottom while undergoing ozone catalytic oxidation reaction in the catalyst bed layer.

[0030] Compared with the current mainstream ozone catalytic oxidation technology, the present utility model has the advantages of high COD removal rate, low energy consumption, small investment cost and wide application range. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an ozone catalytic oxidation reactor for high-salinity wastewater.

[0032] Figure 2 It is a schematic diagram of a water inlet distributor.

[0033] Figure 3 It is a structural schematic diagram of an embodiment of an ozone catalytic oxidation system for high-salinity wastewater.

[0034] Figure 4 It is a structural schematic diagram of an ozone interface distributor.

[0035] Reference signs: 1 - primary reactor, 2 - secondary reactor, 3 - ozone generator, 4 - water production tank, 5 - liquid level transmitter, 6 - water inlet regulating valve, 7 - U-shaped pipe, 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 outlet pipe, 99 - water inlet nozzle, 101 - carrier gas liquid pump, 102 - gas cover, 103 - carrier gas liquid inlet, 104 - gas-liquid mixing outlet, 105 - ozone gas inlet pipe, 106 - gas inlet hole. DETAILED DESCRIPTION

[0036] The utility model relates to a kind of ozone catalytic oxidation reactors for high-salinity wastewater, including tank body, water inlet distributor 11 is arranged in the upper portion of the tank body, water inlet distributor 11 is connected with the water inlet pipeline that projects tank body, tank body top is also provided with breathing port, tank body bottom is provided with water production pipe 66 and ozone gas inlet device;

[0037] The liquid secondary distributor 22, the catalyst bed and the gas secondary distributor 44 are sequentially and fixedly arranged in the tank body from top to bottom, the ozone gas inlet device is arranged below the gas secondary distributor 44, and the catalyst bed is provided with the catalyst layer 33.

[0038] The liquid secondary distributor 22 and the gas secondary distributor 44 are both grid-shaped, the pore size of the liquid secondary distributor 22 is larger than that of the gas secondary distributor 44, and the pore size of the gas secondary distributor 44 is smaller than the particle size of the catalyst.

[0039] The water inlet distributor 11 includes the 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.

[0040] In one embodiment, the ozone gas inlet device includes the ozone gas inlet pipe 105 and the ozone interface distributor 55, the ozone gas inlet pipe 105 extends into the shell from the bottom of the shell and is connected to the ozone interface distributor 55 fixedly arranged in the tank body.

[0041] The ozone interface distributor 55 includes a hollow shell, a carrier gas liquid inlet 103 for carrier gas liquid is arranged on one end of the shell, a gas-liquid mixing outlet 104 is arranged on the other end of the shell, the diameter of the middle part of the shell is smaller than the diameter of the two ends of the shell, a gas cover 102 is fixedly and sealingly connected outside the middle part of the shell, and the sealing area between the gas cover 102 and the shell is connected with the ozone gas inlet pipe 105.

[0042] The gas inlet holes 106 are arranged uniformly on the shell near the middle part of the shell on the side of the carrier gas liquid inlet 103, and the gas inlet holes 106 are all located in the gas cover 102.

[0043] The inlet hole 106 has a diameter of 1-1.5 mm and a spacing of 5 mm.

[0044] In one embodiment, the water inlet distributor 11 comprises a water inlet pipe and a main ring pipe 77 fixedly connected to the inner wall of the shell, the water inlet pipe extending into the shell and connected to the main ring pipe 77, and a plurality of branch pipes 88 are uniformly 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 ends of the branch pipes 88 away from the main ring pipe 77 are provided with the water inlet nozzles 99.

[0045] The catalyst is a porous metal supported catalyst with a particle size of 50-1000 microns.

[0046] The liquid secondary distributor 22 and the gas secondary distributor 44 are both grid-shaped distributors made of 2205 duplex stainless steel.

[0047] An ozone catalytic oxidation system for high-salinity wastewater comprises an ozone catalytic oxidation reactor for high-salinity wastewater, which is arranged in two stages, i.e., a primary reactor 1 and a secondary reactor 2.

[0048] The water inlet distributor 11 on the primary reactor 1 is connected to high-salinity wastewater from the front end by a high-concentration salt water delivery pump, and the ozone inlet pipe 105 on the primary reactor 1 is connected to an ozone generator 3.

[0049] The primary reactor 1 is connected to a water production tank 4 through the secondary reactor 2, and 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, and the intermediate pipeline is provided with an intermediate water pump and a water inlet regulating valve 6, and the primary reactor 1 is provided with a liquid level transmitter 5 for monitoring the liquid level in the primary reactor 1, and the liquid level transmitter 5 is connected to the water inlet regulating valve 6.

[0050] 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 tank 4 through a U-shaped pipe 7 for controlling the liquid level in the connected reactor.

[0051] It also comprises a carrier gas water pump 101, and the water production tank 4 is connected to a reflux pipeline through the carrier gas water pump 101, one end of the reflux pipeline is connected to the carrier gas water pump 101, and the other end of the reflux pipeline is connected to the carrier gas liquid inlet 103 of the ozone interface distributor 55 of the primary reactor 1 and the secondary reactor 2 through branch pipes, respectively.

[0052] An ozone catalytic oxidation method for high-salinity wastewater, which uses an ozone catalytic oxidation system for high-salinity wastewater to perform ozone catalytic oxidation of high-salinity wastewater, comprises the following steps:

[0053] The high-salinity wastewater from the front end is pressurized to 0.2-0.25 MPa by a high-concentration salt water delivery pump and is sent into the primary reactor 1 through the water inlet distributor 11 on the primary reactor 1, and 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 rotates from top to bottom and sequentially passes through the liquid secondary distributor 22, the catalytic layer and the gas secondary distributor 44;

[0054] The ozone generator 3 outputs ozone mixed gas with a mass concentration of not less than 10% into the shell bottom of the primary reactor 1 through the ozone inlet device, and sequentially passes through the liquid secondary distributor 22, the catalytic layer and the gas secondary distributor 44 from bottom to top.

[0055] The high-salinity wastewater and ozone in the catalyst bed layer have an ozone catalytic oxidation reaction, and 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 reaction, and the remaining air or oxygen after the reaction is discharged from the breathing port at the top of the primary reactor 1, and the water produced by the primary reactor 1 enters the secondary reactor 2 through the intermediate water pump and the water inlet adjusting valve 6, and 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 rotates from top to bottom and sequentially passes through the liquid secondary distributor 22, the catalytic layer and the gas secondary distributor 44.

[0056] The ozone mixed gas enters the shell bottom of the secondary reactor 2 through the ozone inlet device, and sequentially passes through the gas secondary distributor 44, the catalytic layer and the liquid secondary distributor 22 from bottom to top.

[0057] The high-salinity wastewater and ozone entering the secondary reactor 2 have an ozone catalytic oxidation reaction in the catalyst bed layer, and 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 reaction, and 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 produced water pool 4.

[0058] Part of the water in the produced water pool 4 enters the carrier gas water pump 101 and returns 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.

[0059] The utility model discloses the water is sprayed with the tangential 5-10 degrees angle, ensure that the whole water flow is from top to bottom with the micro internal rotation, strengthen the reaction mass transfer, and provide a centrifugal force for the catalyst particles, maximize guarantee catalyst " disturbance " instead of " floating ", ozone mixed gas from bottom to top, wastewater from top to bottom, and ozone catalytic oxidation reaction occurs in the catalyst bed layer, and 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 reaction, thereby can greatly improve the COD removal rate under the premise of greatly reducing the device investment and energy consumption.

[0060] Compared with the current mainstream ozone catalytic oxidation technology, the utility model discloses have the advantages such as high COD removal rate, low energy consumption, small investment cost, wide application range, etc.;With coal chemical high salt (TDS not less than 30000mg / L) wastewater COD treatment as an example, the COD removal rate of the technology can reach more than 65%, O3 / COD is as low as 1.8 or less, the reaction residence time is not more than 2 hours, the comprehensive investment cost of the device is more than 20% lower than the mainstream, and it can be applied to the removal of high-salinity wastewater COD in various industries.

[0061] The high-salinity wastewater outside the boundary area is first sent to the first reactor 1 by the high-concentration salt water delivery pump. The high-concentration salt water delivery pump can be provided with two, and a one-to-one backup arrangement is adopted. The annual continuous operation time is usually not less than 8400h, and the delivery pressure of the high-concentration salt water delivery pump is generally not less than 0.25MPAG, so as to ensure the required water inlet pressure of the reactor.

[0062] The first ozone catalytic reactor is connected with the high-concentration salt water delivery pump by a pipeline. The pipeline material needs to meet the requirements of corrosion resistance and strength. The water enters the main ring pipe 77 at a speed of not more than 1.5m / s, then enters the water distribution pipe 88 at a speed of 3m / s, and is sprayed out from the enlarged opening at a tangential angle of 5-10 degrees. The flow rate of the water distribution pipe 88 is usually not more than 15m 3 / h. The overall flow rate of the wastewater entering the reactor is 15-30m / h. The static catalyst bed volume is 0.7-1 times the water inlet flow rate of the reactor. The disturbed catalyst bed design volume is 1-1.3 times the water inlet flow rate of the reactor. The wastewater and ozone bubbles contact and react in the catalyst area. The reacted wastewater is discharged from the bottom, and the gas is discharged from the top. The operating pressure of the first reactor 1 is 0.05-0.01MPaG. The ozone interface distributor 55 can be provided with multiple, and a single one can meet the water supply and gas supply amount of not more than 30m 3 / h of water inlet. The ozone concentration is generally not less than 120g / L.

[0063] The water produced by the first reactor 1 is sent to the second reactor 2 by an intermediate water pump. The reaction liquid level of the first reactor 1 is interlocked controlled by the second reactor 2 water inlet regulating valve 6 and the first reactor 1 liquid level transmitter 5.

[0064] In order to control the outlet water level of the second reactor 2, the outlet is provided with a reverse U-shaped pipe 7. The top end height of the pipeline is the same as the required liquid level of the reactor. An exhaust valve is arranged at the top of the pipeline, and exhaust is needed when starting.

Claims

1. An ozone catalytic oxidation reactor for high-salinity wastewater, comprising a tank body, characterized in that, The water inlet distributor is arranged at the upper part of the tank body, and a water inlet pipeline extending out of the tank body is connected to the water inlet distributor; the tank body is further provided with a breathing port at the top and a water production pipeline and an ozone gas inlet device at the bottom; The liquid secondary distributor, the catalyst bed and the gas secondary distributor are sequentially arranged in the tank body from top to bottom; the ozone gas inlet device is arranged below the gas secondary distributor; and the catalyst bed is provided with a catalyst layer; The liquid secondary distributor and the gas secondary distributor are both in the form of a grid; the pore size of the liquid secondary distributor is larger than that of the gas secondary distributor; and the pore size of the gas secondary distributor is smaller than the particle size of the catalyst; The water inlet distributor comprises water inlet nozzles; and the water inlet nozzles spray water in a direction with an included angle of 5-10 degrees with respect to the tangential direction of the tank body.

2. The ozone catalytic oxidation reactor for high-salinity wastewater according to claim 1, wherein The ozone gas inlet device comprises an ozone gas inlet pipe and an ozone interface distributor; the ozone gas inlet pipe extends into the tank body from the bottom of the shell and is connected to the ozone interface distributor fixedly arranged in the tank body; The ozone interface distributor comprises a hollow shell; a carrier liquid inlet for carrier liquid is arranged at one end of the shell; a gas-liquid mixing outlet is arranged at the other end of the shell; the diameter of the middle part of the shell is smaller than the diameters of the two ends of the shell; a gas cover is fixedly and sealingly connected to the middle part of the shell; the sealing area between the gas cover and the shell is connected to the ozone gas inlet pipe; Air inlets are uniformly arranged on the shell at the side of the carrier liquid inlet and close to the middle part of the shell; and the air inlets are all located in the gas cover.

3. The ozone catalytic oxidation reactor for high-salinity wastewater according to claim 2, characterized in that, The pore size of the air inlets is 1-1.5 mm, and the distance between the air inlets is 5 mm.

4. The ozone catalytic oxidation reactor for high-salinity wastewater according to claim 1, wherein The water inlet distributor comprises 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 extends into the shell and is connected to the main ring pipe; a plurality of water distribution pipes are uniformly arranged 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 all provided with the water inlet nozzles at the ends away from the main ring pipe.

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

6. The ozone catalytic oxidation reactor for high-salinity wastewater according to claim 1, wherein 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 2-6, characterized in that, The ozone catalytic oxidation reactor for high-salinity wastewater is provided with two stages, i.e., a primary reactor and a secondary reactor; The water inlet distributor of the primary reactor is connected to high-salinity wastewater from the front end by a high-concentration salt water delivery pump; and the ozone gas inlet pipe of the primary reactor is connected to an ozone generator. The primary reactor is connected to a water production tank through the secondary reactor; the water production pipeline of the primary reactor is connected to the water inlet distributor of the secondary reactor through an intermediate pipeline; the intermediate pipeline is provided with an intermediate water pump and a water inlet adjusting 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 adjusting valve. The ozone gas inlet pipe of 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 tank through a U-shaped pipe for controlling the liquid level in the connected reactor. The water production tank is connected with a carrier gas water pump, and the carrier gas water pump is connected with a reflux pipeline, one end of the reflux pipeline is connected with the carrier gas water pump, and the other end of the reflux pipeline is connected with the carrier gas liquid inlet of the ozone interface distributor of the first reactor and the second reactor through branch pipes.

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