Wastewater ozone catalytic oxidation system and control method thereof

Abstract

The invention discloses a wastewater ozone catalytic oxidation system and a control method thereof. The system comprises an ozone catalytic oxidation pond, an ozone generator, a wastewater tank, a backwashing water tank and a backwashing fan, the control method comprises the steps of S1, normal operation of the system, S2, backwashing of the catalytic ozonation pond, S3, ozone aeration purging and S4, adjustment of the ozone adding amount of the ozone generator. The device has the advantages that the purging pipeline connected with the ozone aeration disc and the standby ozone aeration pipe are added, and when the aeration disc is blocked, by switching related valves, on one hand, normal air supply can be realized through the sampling aeration pipe, and on the other hand, the aeration disc can be subjected to high-pressure purging by using compressed air in a plant area, so that online cleaning of the aeration disc is realized without stopping for cleaning; the continuous and stable operation of the wastewater treatment system is ensured; moreover, a backwashing fan and a backwashing water tank are additionally arranged, so that regular online cleaning of the catalytic ozonation pond is realized, the stability of the system is further improved, and meanwhile, continuous operation of the system can be ensured.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater ozone catalytic oxidation system and its control method. Background Technology

[0002] Ozone catalytic oxidation technology for wastewater is a green and highly efficient advanced oxidation technology. It primarily utilizes the strong oxidizing properties of ozone and the even more potent oxidizing hydroxyl radicals (·OH) generated under the action of a catalyst to non-selectively decompose most recalcitrant organic matter in wastewater. Ozone catalytic oxidation technology is widely used due to its strong oxidizing performance, rapid reaction, lack of secondary pollution, and convenient operation and management.

[0003] Main problems: 1) At present, the control of ozone catalytic oxidation technology is mainly based on adjusting the ozone dosage of the ozone generator according to the COD of the influent and effluent and the treatment volume. The laboratory COD concentration detection is mainly based on the potassium dichromate digestion colorimetric method, which takes 40 to 60 minutes to obtain a result. In addition, the residence time in the catalytic oxidation tank results in serious data lag, which cannot guide the adjustment of ozone dosage in a timely and accurate manner, and is prone to excessive ozone dosage or high COD of effluent. 2) To improve ozone utilization, most ozone generators use microporous aeration discs for aeration. However, due to the low ozone pressure at the outlet of the ozone generator (approximately 90 kPa) and the presence of suspended solids in the wastewater, the microporous aeration discs become clogged and the pressure difference in the catalyst bed increases after a period of operation. This reduces the ozone intake and dosage, which can easily lead to higher COD in the effluent. Therefore, it is necessary to periodically shut down the generator to clean the aeration discs and backwash the catalyst bed. Summary of the Invention

[0004] The first objective of this invention is to provide a wastewater ozone catalytic oxidation system.

[0005] The second objective of this invention is to provide a control method for a wastewater ozone catalytic oxidation system.

[0006] The first objective of this invention is achieved by the following technical solution: a wastewater ozone catalytic oxidation system, comprising an ozone catalytic oxidation tank, an ozone generator, a wastewater tank, a backwash tank, and a backwash fan. Inside the ozone catalytic oxidation tank are an ozone aeration disc, an ozone aeration pipe with upward-facing outlets, and a backwash aeration pipe with outlets facing the bottom of the ozone catalytic oxidation tank. The outlet of the ozone generator is connected to the inlet of the main ozone pipe, and the outlet of the main ozone pipe is connected to the ozone aeration disc via a first branch pipe and a second branch pipe, respectively. The ozone aeration pipe is connected to the inlet of the ozone main pipe; an ozone inlet flow meter and an ozone inlet concentration meter are installed on the main ozone pipe; a first ozone inlet valve and a second ozone inlet valve are installed on the first branch pipe and the second branch pipe, respectively; the first branch pipe on the outlet side of the first ozone inlet valve is connected to the factory compressed air network through a purge pipe; a purge flow meter, a purge pressure gauge, and a purge inlet valve are sequentially installed on the purge pipe along the airflow direction; the outlet of the backwash fan is connected to the inlet of the backwash aeration pipe through an air washing pipe. A backwash air flow meter and a backwash inlet valve are sequentially installed on the air washing pipe along the airflow direction; the outlet of the wastewater tank is connected to the inlet of the wastewater pump, and the outlet of the wastewater pump is connected to the bottom of the ozone catalytic oxidation tank through a wastewater pipe; an inlet flow meter, an inlet COD concentration meter, and an inlet valve are sequentially installed on the wastewater pipe along the water flow direction; the outlet of the backwash water tank is connected to the inlet of the backwash water pump, and the outlet of the backwash water pump is connected to the bottom of the ozone catalytic oxidation tank through a backwash water inlet valve; the ozone catalytic oxidation tank... The side wall of the ozone catalytic oxidation tank is connected to the production water tank via a production water pipe. An outlet valve and a production water COD concentration meter are installed sequentially on the production water pipe along the water flow direction. The middle of the side wall of the ozone catalytic oxidation tank is connected to the inlet of the backwash water collection tank via a collection pipe. A backwash drain valve is installed on the collection pipe. A backwash gas discharge pipe and a tail gas pipe are connected to the top of the ozone catalytic oxidation tank. A backwash gas discharge valve is installed on the backwash gas discharge pipe. An ozone concentration meter and an ozone tail gas outlet valve are installed sequentially on the tail gas pipe along the airflow direction.

[0007] The second objective of this invention is achieved by the following technical solution: a control method for a wastewater ozone catalytic oxidation system, comprising the following processes: S1: System is running normally Close the backwash water inlet valve, backwash drain valve, backwash air inlet valve, backwash air exhaust valve, backwash blower, backwash water pump, purge air inlet valve, and second ozone air inlet valve; open the inlet valve, outlet valve, first ozone air inlet valve, wastewater pump, and ozone generator. S2: Backwashing of the ozone catalytic oxidation tank During the S1 process, the ozone catalytic oxidation tank is backwashed every T1h. S3: Ozone Aeration and Purging During process S1, when the ozone intake flow meter detects a current ozone flow rate of <60 Nm 3 When the ozone intake is / h, first open the second ozone intake valve, then close the first ozone intake valve, and then open the purge intake valve. The compressed air in the factory's compressed air pipeline enters the ozone aeration disc through the purge pipe and purges for T6min. After the purge is completed, first close the purge intake valve, then open the first ozone intake valve, and then close the second ozone intake valve.

[0008] S4: Ozone generator ozone dosage adjustment During process S1, based on historical data detected by the influent flow meter, influent COD concentration meter, product water COD concentration meter, ozone inlet flow meter, ozone inlet concentration meter, and exhaust gas ozone concentration meter in the previous 24 hours, current data detected by the influent flow meter, influent COD concentration meter, exhaust gas ozone concentration meter, and ozone inlet flow meter, as well as the product water COD setpoint and exhaust gas ozone concentration setpoint, the required ozone dosage of the ozone generator for the system is calculated, and then the ozone dosage of the ozone generator is adjusted.

[0009] Furthermore, in step S2, the specific process of backwashing the ozone catalytic oxidation tank is as follows: S2-1 Open the backwash drain valve to drain water for T2s; S2-2 Open the backwash air discharge valve and backwash air inlet valve, and start the backwash fan for air washing T3s; S2-3 Open the backwash water inlet valve and start the backwash water pump; air-water backwash T4s. S2-4 Stop the backwash fan and close the backwash inlet valve and backwash exhaust valve, then perform water washing T5s separately; S2-5 Stop the backwash water pump and close the backwash water inlet valve and backwash drain valve. Furthermore, in S3, the purging gas pressure of the compressed air in the factory's compressed air pipeline is P, where 0.15MPa < P ≤ 0.2MPa.

[0010] Furthermore, in S4, the specific calculation formula is as follows:

[0011] in, This represents the average influent flow rate detected by the influent flow meter over the previous 24 hours, in meters per second (m³). 3 / h; The average COD concentration of the influent measured by the influent COD meter in the previous 24 hours is expressed in mg / L. This is the average COD value of the effluent detected by the COD concentration meter in the previous 24 hours, in mg / L. This represents the average ozone intake flow rate detected by the ozone intake flow meter over the previous 24 hours, in Nm³. 3 / h; This represents the average ozone concentration in the inlet air detected by the ozone inlet concentration meter over the previous 24 hours, in g / Nm³. 3 ; This represents the average ozone concentration in the exhaust gas detected by the ozone concentration meter over the previous 24 hours, in g / Nm³. 3 ; The current influent flow rate detected by the influent flow meter, in m³ / s. 3 / h; This is the current COD value detected by the influent COD concentration meter, in mg / L; Set the COD value for the produced water, in mg / L; This refers to the current ozone concentration in the exhaust gas detected by the exhaust gas ozone concentration meter, in g / Nm³. 3 ; The set value for ozone concentration in exhaust gas, in g / Nm³. 3 ; The current ozone intake flow rate detected by the ozone intake flow meter, in Nm³. 3 / h.

[0012] Advantages of this invention: The wastewater ozone catalytic oxidation system of this invention adds a purge pipeline connected to the ozone aeration discs and a spare ozone aeration pipe. When the aeration discs become clogged, by switching the relevant valves, on the one hand, normal air supply can be provided through the sampling aeration pipe, and on the other hand, compressed air from the plant area can be used to perform high-pressure purging of the aeration discs, realizing online cleaning of the aeration discs without shutdown for cleaning, ensuring the continuous and stable operation of the wastewater treatment system. Furthermore, this invention also adds a backwash fan and a backwash water tank, adopting a method of first air washing, then air-water mixed washing, and finally water washing to achieve regular online cleaning of the ozone catalytic oxidation tank, further improving the stability of the system and ensuring continuous operation of the system. Furthermore, during system operation, historical data detected by the influent flow meter, influent COD concentration meter, product water COD concentration meter, ozone inlet flow meter, ozone inlet concentration meter, and exhaust gas ozone concentration meter in the previous 24 hours, current data detected by the influent flow meter, influent COD concentration meter, exhaust gas ozone concentration meter, and ozone inlet flow meter, as well as the product water COD setpoint and exhaust gas ozone concentration setpoint, can be used to calculate the required ozone dosage for the ozone generator. This enables joint adjustment of the ozone dosage, avoiding lag in COD meter monitoring data and effectively reducing the ozone dosage while ensuring treatment effectiveness. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall system in this embodiment.

[0014] In the picture: 1. Ozone catalytic oxidation tank; 2. Ozone generator; 3. Wastewater tank; 4. Backwash water tank; 5. Backwash blower; 6. Ozone aeration disc; 7. Ozone aeration pipe; 8. Backwash gas aeration pipe; 9. Ozone main pipe; 10. First branch pipe; 11. Second branch pipe; 12. Ozone inlet flow meter; 13. Ozone inlet concentration meter; 14. First ozone inlet valve; 15. Second ozone inlet valve; 16. Purge pipe; 17. Purge flow meter; 18. Purge pressure gauge; 19. Purge inlet valve; 10. Gas washing pipe; 11. Backwash gas. Flow meter 18, backwash air inlet valve 19, wastewater pump 20, wastewater pipe 21, inlet flow meter 22, inlet COD concentration meter 23, inlet valve 24, backwash water pump 25, backwash water inlet valve 26, product water pipe 27, product water tank 28, outlet valve 30, product water COD concentration meter 31, backwash water collection tank 32, backwash drain valve 33, backwash gas exhaust pipe 34, tail gas pipe 35, backwash gas exhaust valve 36, tail gas ozone concentration meter 37, ozone tail gas outlet valve 38. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0016] like Figure 1 As shown, a wastewater ozone catalytic oxidation system includes an ozone catalytic oxidation tank 1, an ozone generator 2, a wastewater tank 3, a backwash water tank 4, and a backwash blower 5. Inside the ozone catalytic oxidation tank 1, there are ozone aeration discs 101, ozone aeration pipes 102 with upward-facing outlets, and backwash aeration pipes 103 with outlets facing the bottom of the ozone catalytic oxidation tank 1. The outlet of the ozone generator 2 is connected to the inlet of the main ozone pipe 6. The outlet of the main ozone pipe 6 is connected to the inlet of the ozone aeration disc 101 and the ozone aeration pipe 102 via a first branch pipe 7 and a second branch pipe 8, respectively. The system is connected to the ozone main pipe 6, which is equipped with an ozone inlet flow meter 9 and an ozone inlet concentration meter 10. A first ozone inlet valve 11 and a second ozone inlet valve 12 are installed on the first branch pipe 7 and the second branch pipe 8, respectively. The first branch pipe 7, located at the outlet of the first ozone inlet valve 11, is connected to the factory's compressed air network via a purge pipe 13. A purge flow meter 14, a purge pressure gauge 15, and a purge inlet valve 16 are sequentially installed on the purge pipe 13 along the airflow direction. The outlet of the backwash fan 5 is connected to the inlet of the backwash air aeration pipe 103 via an air washing pipe 17. A purge flow meter 14, a purge pressure gauge 15, and a purge inlet valve 16 are sequentially installed on the air washing pipe 17 along the airflow direction. A backwash air flow meter 18 and a backwash inlet valve 19 are sequentially installed along the airflow direction. The outlet of wastewater tank 3 is connected to the inlet of wastewater pump 20, and the outlet of wastewater pump 20 is connected to the bottom of ozone catalytic oxidation tank 1 through wastewater pipe 21. An inlet flow meter 22, an inlet COD concentration meter 23, and an inlet valve 24 are sequentially installed along the water flow direction on wastewater pipe 21. The outlet of backwash water tank 4 is connected to the inlet of backwash water pump 25, and the outlet of backwash water pump 25 is connected to the bottom of ozone catalytic oxidation tank 1 through backwash water inlet valve 26. The side wall of ozone catalytic oxidation tank 1 is connected to the inlet of backwash water pump 25. The product water pipe 27 is connected to the product water tank 28. A water outlet valve 30 and a product water COD concentration meter 31 are installed sequentially on the product water pipe 27 along the water flow direction. The middle of the side wall of the ozone catalytic oxidation tank 1 is connected to the inlet of the backwash water collection tank 32 through a collection pipe. A backwash drain valve 33 is installed on the collection pipe. A backwash gas discharge pipe 34 and a tail gas pipe 35 are connected to the top of the ozone catalytic oxidation tank 1. A backwash gas discharge valve 36 is installed on the backwash gas discharge pipe 34. A tail gas ozone concentration meter 37 and an ozone tail gas outlet valve 38 are installed sequentially on the tail gas pipe 35 along the airflow direction.

[0017] Its control methods include the following processes: S1: System is running normally Close the backwash water inlet valve 26, backwash drain valve 33, backwash air inlet valve 19, backwash air exhaust valve 36, backwash blower 5, backwash water pump 25, purge air inlet valve 16, and second ozone air inlet valve 12; open the water inlet valve 24, water outlet valve 30, first ozone air inlet valve 11, wastewater pump 20, and ozone generator 2. Wastewater pump 20 pumps wastewater from wastewater tank 3 into ozone catalytic oxidation tank 1 via wastewater pipe 21. At the same time, ozone generated by ozone generator 2 enters ozone catalytic oxidation tank 1 via ozone main pipe 6, first branch pipe 7, and ozone aeration disc 101. Wastewater treated by ozone catalytic oxidation enters product water tank 28 via product water pipe 27. The gas in ozone catalytic oxidation tank 1 is discharged to the subsequent exhaust gas treatment system via tail gas pipe 35. S2: Backwashing of the ozone catalytic oxidation tank During the S1 process, the ozone catalytic oxidation tank is backwashed every T1h to achieve regular online cleaning of the ozone catalytic oxidation tank. The specific process of backwashing the ozone catalytic oxidation tank is as follows: S2-1 Open the backwash drain valve 33 to drain T2s, discharging part of the wastewater in the ozone catalytic oxidation tank 1 into the backwash water collection tank 32, lowering the liquid level of the ozone catalytic oxidation tank 1, and preparing for subsequent treatment. S2-2 Open the backwash gas discharge valve 36 and the backwash gas inlet valve 19, and start the backwash fan 5. The backwash gas aeration pipe 17 and the backwash gas aeration pipe 103 sent by the backwash fan 5 enter the ozone catalytic oxidation tank 1 for pneumatic stirring to achieve gas washing, gas washing T3s. S2-3 Open the backwash water inlet valve 26 and start the backwash water pump 25. The backwash water pump 25 sends the backwash water stored in the backwash water tank 4 into the ozone catalytic oxidation tank 1 to realize the gas-water backwash process of simultaneous gas washing and water washing. Gas-water backwash T4s. S2-4 Stop the backwash fan 5, and close the backwash inlet valve 19 and the backwash exhaust valve 36. The backwash water pump 25 continues to run, and performs water washing T5s separately. S2-5 stops the backwash water pump 25 and closes the backwash water inlet valve 26 and the backwash drain valve 33 to complete the backwash process.

[0018] S3: Ozone Aeration and Purging During process S1, when the ozone intake flow meter 9 detects that the current ozone flow rate is <60 Nm 3If the ozone aeration disc 101 becomes clogged at a certain time (e.g., / h), first open the second ozone inlet valve 12, then close the first ozone inlet valve 11, and then open the purge inlet valve 16. Compressed air from the factory's compressed air network enters the ozone aeration disc 101 through the purge pipe 13 and purges for 6 minutes. After purging, first close the purge inlet valve 16, then open the first ozone inlet valve 11, and then close the second ozone inlet valve 12. The purge air pressure of the compressed air in the factory's compressed air network is P, where 0.15MPa < P ≤ 0.2MPa.

[0019] S4: Ozone generator ozone dosage adjustment In process S1, based on historical data detected by the influent flow meter 22, influent COD concentration meter 23, product water COD concentration meter 31, ozone inlet flow meter 9, ozone inlet concentration meter 10, and exhaust gas ozone concentration meter 37 over the previous 24 hours, the current data detected by the influent flow meter 22, influent COD concentration meter 23, exhaust gas ozone concentration meter 31, and ozone inlet flow meter 9, as well as the product water COD setpoint and exhaust gas ozone concentration setpoint, the required ozone dosage for the ozone generator is calculated, and then the ozone dosage for the ozone generator is adjusted. The product water COD setpoint and exhaust gas ozone concentration setpoint can be set by those skilled in the art based on the actual wastewater quality.

[0020] The specific calculation formula for S4 is as follows:

[0021] in, This represents the average influent flow rate detected by the influent flow meter over the previous 24 hours, in meters per second (m³). 3 / h; The average COD concentration of the influent measured by the influent COD meter in the previous 24 hours is expressed in mg / L. This is the average COD value of the effluent detected by the COD concentration meter in the previous 24 hours, in mg / L. This represents the average ozone intake flow rate detected by the ozone intake flow meter over the previous 24 hours, in Nm³. 3 / h; This represents the average ozone concentration in the inlet air detected by the ozone inlet concentration meter over the previous 24 hours, in g / Nm³. 3 ; This represents the average ozone concentration in the exhaust gas detected by the ozone concentration meter over the previous 24 hours, in g / Nm³. 3 ; The current influent flow rate detected by the influent flow meter, in m³ / s. 3 / h; This is the current COD value detected by the influent COD concentration meter, in mg / L; Set the COD value for the produced water, in mg / L; This refers to the current ozone concentration in the exhaust gas detected by the exhaust gas ozone concentration meter, in g / Nm³. 3 ; The set value for ozone concentration in exhaust gas, in g / Nm³. 3 ; The current ozone intake flow rate detected by the ozone intake flow meter, in Nm³. 3 / h.

[0022] The values ​​T1-T6 can be set according to actual needs. In this embodiment, T1 is 48-72, T2 is 120-180, T3 is 300-600, T4 is 180-300, T5 is 240-600, and T6 is 15-25. In the description of this invention, it should be noted that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

Claims

1. A wastewater ozone catalytic oxidation system, characterized in that, It includes an ozone catalytic oxidation tank, an ozone generator, a wastewater tank, a backwash water tank, and a backwash blower. Inside the ozone catalytic oxidation tank are ozone aeration discs, ozone aeration pipes with upward-facing outlets, and backwash aeration pipes with outlets pointing towards the bottom of the tank. The outlet of the ozone generator is connected to the inlet of a main ozone pipe. The outlet of the main ozone pipe is connected to the inlet of the ozone aeration discs and the ozone aeration pipes via a first branch pipe and a second branch pipe, respectively. A system is installed on the main ozone pipe... The system includes an ozone intake flow meter and an ozone intake concentration meter. A first ozone intake valve and a second ozone intake valve are installed on the first and second branch pipes, respectively. The first branch pipe at the outlet of the first ozone intake valve is connected to the factory's compressed air network via a purge pipe. A purge flow meter, a purge pressure gauge, and a purge intake valve are sequentially installed on the purge pipe along the airflow direction. The outlet of the backwash fan is connected to the inlet of the backwash air aeration pipe via an air washing pipe. Sequentially installed on the air washing pipe along the airflow direction... The system includes a backwash air flow meter and a backwash inlet valve. The outlet of the wastewater tank is connected to the inlet of the wastewater pump, and the outlet of the wastewater pump is connected to the bottom of the ozone catalytic oxidation tank via a wastewater pipe. An inlet flow meter, an inlet COD concentration meter, and an inlet valve are sequentially installed on the wastewater pipe along the water flow direction. The outlet of the backwash water tank is connected to the inlet of the backwash water pump, and the outlet of the backwash water pump is connected to the bottom of the ozone catalytic oxidation tank via a backwash water inlet valve. The sidewall of the ozone catalytic oxidation tank is connected to a production line. The water pipe is connected to the product water tank, and an outlet valve and a product water COD concentration meter are sequentially installed on the product water pipe along the water flow direction; the middle of the side wall of the ozone catalytic oxidation tank is connected to the inlet of the backwash water collection tank through a collection pipe, and a backwash drain valve is installed on the collection pipe; a backwash gas discharge pipe and a tail gas pipe are connected to the top of the ozone catalytic oxidation tank, a backwash gas discharge valve is installed on the backwash gas discharge pipe, and a tail gas ozone concentration meter and an ozone tail gas outlet valve are sequentially installed on the tail gas pipe along the airflow direction.

2. A control method for a wastewater ozone catalytic oxidation system according to claim 1, characterized in that, It includes the following processes: S1: System is running normally Close the backwash water inlet valve, backwash drain valve, backwash air inlet valve, backwash air exhaust valve, backwash blower, backwash water pump, purge air inlet valve, and second ozone air inlet valve; open the inlet valve, outlet valve, first ozone air inlet valve, wastewater pump, and ozone generator. S2: Backwashing of the ozone catalytic oxidation tank During the S1 process, the ozone catalytic oxidation tank is backwashed every T1h. S3: Ozone Aeration and Purging During process S1, when the ozone intake flow meter detects a current ozone flow rate of <60 Nm 3 When the ozone intake valve is open, the second ozone intake valve is opened first, then the first ozone intake valve is closed, and then the purge intake valve is opened. The compressed air in the factory's compressed air pipeline enters the ozone aeration disc through the purge pipe and purges for T6 minutes. After the purge is completed, the purge intake valve is closed first, then the first ozone intake valve is opened, and then the second ozone intake valve is closed. S4: Ozone generator ozone dosage adjustment During process S1, based on historical data detected by the influent flow meter, influent COD concentration meter, product water COD concentration meter, ozone inlet flow meter, ozone inlet concentration meter, and exhaust gas ozone concentration meter in the previous 24 hours, current data detected by the influent flow meter, influent COD concentration meter, exhaust gas ozone concentration meter, and ozone inlet flow meter, as well as the product water COD setpoint and exhaust gas ozone concentration setpoint, the required ozone dosage of the ozone generator for the system is calculated, and then the ozone dosage of the ozone generator is adjusted.

3. The control method for a wastewater ozone catalytic oxidation system according to claim 2, characterized in that, In step S2, the specific process of backwashing the ozone catalytic oxidation tank is as follows: S2-1 Open the backwash drain valve to drain water for T2s; S2-2 Open the backwash air discharge valve and backwash air inlet valve, and start the backwash fan for air washing T3s; S2-3 Open the backwash water inlet valve and start the backwash water pump; air-water backwash T4s. S2-4 Stop the backwash fan and close the backwash inlet valve and backwash exhaust valve, then perform water washing T5s separately; S2-5 Stop the backwash water pump and close the backwash water inlet valve and backwash drain valve.

4. The control method for a wastewater ozone catalytic oxidation system according to claim 2, characterized in that, In S3, the purging gas pressure of the compressed air in the factory's compressed air pipeline is P, where 0.15MPa < P ≤ 0.2MPa.

5. The control method for a wastewater ozone catalytic oxidation system according to claim 2, characterized in that, The specific calculation formula for S4 is as follows: in, This represents the average influent flow rate detected by the influent flow meter over the previous 24 hours, in meters per second (m³). 3 / h; The average COD concentration of the influent measured by the influent COD meter in the previous 24 hours is expressed in mg / L. This is the average COD value of the effluent detected by the COD concentration meter in the previous 24 hours, in mg / L. This represents the average ozone intake flow rate detected by the ozone intake flow meter over the previous 24 hours, in Nm³. 3 / h; This represents the average ozone concentration in the inlet air detected by the ozone inlet concentration meter over the previous 24 hours, in g / Nm³. 3 ; This represents the average ozone concentration in the exhaust gas detected by the ozone concentration meter over the previous 24 hours, in g / Nm³. 3 ; The current influent flow rate detected by the influent flow meter, in m³ / s. 3 / h; This is the current COD value detected by the influent COD concentration meter, in mg / L; Set the COD value for the produced water, in mg / L; This refers to the current ozone concentration in the exhaust gas detected by the exhaust gas ozone concentration meter, in g / Nm³. 3 ; The set value for ozone concentration in exhaust gas, in g / Nm³. 3 ; The current ozone intake flow rate detected by the ozone intake flow meter, in Nm³. 3 / h.

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