Wastewater purification methods

Abstract

The present invention relates to a sewage purification method, belonging to the field of sewage purification methods. The technical solution of the present application is: before adding a catalytic oxidant to the sewage in the sewage pool for catalytic oxidation, circulating ozone is first introduced into the sewage for purification, and then a catalytic oxidant is added for catalytic oxidation, and the sewage is catalytically oxidized to generate inorganic salts, and the sewage that generates inorganic salts enters a sedimentation tank for precipitation of inorganic salts and then outputs for discharge. The present application is different from the existing sewage purification method, can effectively reduce the cost of sewage treatment, and can achieve a better sewage treatment effect.

Description

Technical Field

[0001] The invention relates to a sewage purification method and belongs to the field of sewage purification methods. Background Art

[0002] Industrial production, especially the wastewater generated during the production of pharmaceutical chemicals or new materials, has become increasingly stringent with national emission standards. Conventional biochemical treatment processes are unable to meet emission standards and require deep treatment before they can be discharged in compliance with standards.

[0003] After biochemical treatment, the remaining pollutants in the sewage have poor or no biodegradability. At present, the main treatment method for this sewage is to add oxidants. Basically, two methods are used to remove pollutants in the water, namely, adding ozone or adding Fenton. Both methods have disadvantages, which makes the cost of sewage purification high.

[0004] The first method is to add ozone to oxidize and remove pollutants in sewage. However, due to the low solubility and poor stability of ozone in water, the utilization rate of ozone in this treatment process is low, and a large amount of ozone does not participate in the reaction and overflows from the water body, resulting in a large amount of ozone oxidant waste. At the same time, the overflowed ozone causes secondary pollution to the ambient air.

[0005] The second method is to add Fenton to oxidize and remove pollutants in sewage. Fenton reagent is composed of ferrous sulfate and hydrogen peroxide in a certain ratio. In an acidic state, hydrogen peroxide will quickly decompose into hydroxyl radicals, thereby oxidizing and removing pollutants in sewage, with good removal efficiency and decomposition effect. However, during use, ferrous ions will oxidize into ferric ions, thereby losing their catalytic effect, causing a large amount of iron salts to be produced during the reaction. This precipitate needs to be treated as solid waste or hazardous waste according to the different sewage conditions. This causes an increase in treatment costs and a large amount of labor. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a sewage treatment method which can effectively reduce sewage costs and achieve better treatment effects.

[0007] The sewage purification method described in the present invention includes adding a catalytic oxidant to the sewage in a sewage pool for catalytic oxidation. After the catalytic oxidation, the sewage enters a sedimentation tank for precipitation of inorganic salts and then is output. Before the sewage is catalytically oxidized, ozone is first introduced into the sewage for purification. The ozone circulates in the sewage. After the ozone purification is completed, a catalytic oxidant is added for catalytic oxidation.

[0008] In the sewage purification method, the catalytic oxidant is Fenton.

[0009] The sewage purification method comprises the steps of atomizing ozone and sewage into gas and liquid and then spraying the atomized ozone into the sewage.

[0010] In the sewage purification method, sewage is purified in an ozone reaction device, and the ozone reaction device is in a positive pressure state.

[0011] The sewage purification method is to subject the sewage to cyclone flow in an ozone reaction device.

[0012] The sewage purification method comprises a catalytic oxidation tank and a sedimentation tank, wherein the catalytic oxidation tank is connected to the sedimentation tank, and the oxidation tank is also connected to an ozone reaction tank, and the ozone reaction tank discharges the treated sewage into the catalytic oxidation tank under the control of a control device, and the catalytic oxidation tank catalytically oxidizes the sewage and then outputs it through the sedimentation tank;

[0013] An atomizing rotary ejector is provided at the bottom of the ozone reaction tank;

[0014] A constant pressure valve is arranged on the top of the ozone reaction tank, and a pressure boosting port is arranged on the ozone reaction tank, and a pressure boosting pump is connected to the pressure boosting port.

[0015] In the sewage purification method, the atomizing rotary ejector comprises a venturi tube, the venturi tube is connected to an ozone source through a booster pump, and the liquid inlet end of the venturi tube is connected to an ozone reaction tank.

[0016] In the sewage purification method, the discharge end of the venturi tube is connected with an L-shaped elbow.

[0017] In the sewage purification method, a baffle is arranged in the catalytic oxidation tank.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] Compared with the prior art, the sewage purification method described in the present invention first catalytically oxidizes the sewage through ozone, and then uses ferrous salt to perform secondary catalytic oxidation treatment on the treated water after catalytic oxidation, and catalytically oxidizes the remaining pollutants. In this case, a large amount of pollutants have been treated by ozone, and a small amount of ferrous salt is used to compensate for the insufficient catalytic oxidation capacity of ozone, so that only a very small amount of iron salt will be generated, which greatly reduces the cost of solid waste treatment.

[0020] The sewage purification method described in the present invention can break up ozone to form micro bubbles, mix the micro bubbles with sewage, and then spray them out in a rotational manner, so that the ozone in the micro bubble state can be fully and evenly distributed laterally in the sewage, thereby increasing the contact area, fully combining sewage and ozone, improving the catalytic oxidation efficiency of ozone and sewage, reducing the amount of ozone used per unit amount of sewage, and effectively reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 yes Figure 1 Side view of

[0023] Figure 3 The structure of the present invention is schematically shown in FIG. Figure 2 ;

[0024] Figure 4 yes Figure 3 A cross-sectional view of

[0025] Figure 5 yes Figure 4 A partial enlarged view of

[0026] Figure 6 yes Figure 5 A cross-sectional view of

[0027] Figure 7 It is a structural schematic diagram of an atomizing rotary ejector;

[0028] Figure 8 It is the front view of the atomizing rotary ejector;

[0029] Fig. 9 yes Figure 8 A cross-sectional view of

[0030] Fig.10 is a schematic diagram of the structure of a catalytic oxidation tank;

[0031] Fig.11 It is the electrical schematic diagram of the control device.

[0032] In the figure: 1. Catalytic oxidation tank; 2. Sedimentation tank; 3. Atomizing rotary ejector; 4. Buffer tank;

[0033] 5. Booster pump; 51. Booster pump A; 52. Booster pump B; 53. Booster pump C;

[0034] 6. Venturi tube; 7. Bearing; 8. Air guide tube; 9. Air inlet window; 10. Mounting ring; 11. Driving blade; 12. L-shaped elbow; 13. Liquid inlet pipe; 14. Rotary sealing device; 15. Baffle;

[0035] 161. Ozone reaction tank A; 162. Ozone reaction tank B; 163. Ozone reaction tank C;

[0036] 171, liquid level switch AA; 172, liquid level switch AB; 173, liquid level switch BA; 174, liquid level switch BB; 175, liquid level switch CA; 176, liquid level switch CB;

[0037] 181, relay AA; 182, relay AB; 183, relay BA; 184, relay BB; 185, relay CA; 186, relay CB;

[0038] 191. Ozone reaction tank A inlet solenoid valve; 192. Ozone reaction tank A discharge solenoid valve; 193. Ozone reaction tank B inlet solenoid valve; 194. Ozone reaction tank B discharge solenoid valve; 195. Ozone reaction tank C inlet solenoid valve; 196. Ozone reaction tank C discharge solenoid valve;

[0039] 201, relay XA; 202, relay XB; 203, relay YA; 204, relay YB; 205, relay ZA; 206 relay ZB;

[0040] 211 water replenishment chip; 212, drainage chip A; 213, drainage chip B; 214, drainage chip C;

[0041] 22. Push button switch;

[0042] 23. Constant pressure valve;

[0043] 24. Pipe opening;

[0044] 251, DC power supply A; 252, DC power supply B; 253, auxiliary power supply A; 254, auxiliary power supply B; 255, auxiliary power supply C;

[0045] 26. The closed end of the airway tube. DETAILED DESCRIPTION

[0046] Example 1

[0047] like Figures 1 to 11 As shown, the sewage purification method described in the present invention first introduces ozone into the sewage, and performs a first catalytic oxidation on the sewage by ozone. The ozone-treated sewage is then added to Fenton for catalytic oxidation. Trace iron salts are produced during the Fenton catalytic oxidation process. After catalytic oxidation, the sewage enters the sedimentation tank 2 for precipitation of the iron salts and then is output.

[0048] In the sewage purification method, since ozone is extremely insoluble in water, it will float up and leave the sewage after entering it, so increasing the reaction area can effectively improve the reaction efficiency. Therefore, the present application converts ozone into tiny bubbles, converts sewage into small water droplets, and mixes the ozone tiny bubbles with the small water droplets, so that the contact area can be maximized. After the ozone contacts and reacts with the sewage, it will be sprayed into the accumulated sewage, so that the ozone continues to react with the sewage to catalytically oxidize during the floating process, thereby improving the catalytic oxidation efficiency of ozone on sewage.

[0049] The sewage purification method is in a positive pressure state in the ozone reaction device, wherein the air pressure is 0.15 MPa. The ozone reaction device in a positive pressure state increases the air pressure on the upper surface of the sewage, slowing down the speed at which ozone in the sewage emerges. This allows the ozone to stay in the sewage for a longer time, prolonging the reaction time and improving the utilization rate of the ozone.

[0050] The sewage purification method mentioned above is to stir the sewage up and down in an ozone reaction device to form a swirling flow, thereby driving the bubbles to turn down and prolonging the residence time of the ozone bubbles in the water.

[0051] The sewage purification method of the present invention comprises a catalytic oxidation tank 1 and a sedimentation tank 2, wherein the catalytic oxidation tank 1 is connected to the sedimentation tank 2, and the oxidation tank is also connected to an ozone reaction tank, and the sewage is output after passing through the ozone reaction tank, the catalytic oxidation tank 1 and the sedimentation tank 2 in sequence;

[0052] The ozone reaction tanks are provided with three groups, and the three groups of ozone reaction tanks are controlled by the control device to cyclically inject the preliminarily purified sewage into the catalytic oxidation tank 1 in turn. The purified sewage can be purified continuously, and the preliminarily purified sewage is added to the catalytic oxidation tank 1 and then enters the sedimentation tank 2, and is discharged after sedimentation in the sedimentation tank 2. This structure allows the sewage to be catalytically oxidized by ozone in a sealed environment while ensuring that the sewage can be purified continuously.

[0053] An atomizing rotary ejector 3 is provided at the bottom of the ozone reaction tank. The atomizing rotary ejector 3 is located in a pipe extending into the bottom of the ozone reaction tank, and the other end of the pipe is connected to the air outlet of the booster pump 5.

[0054] A constant pressure valve 23 is provided on the top of the ozone reaction tank, the air outlet of the constant pressure valve 23 is connected to the air inlet of the buffer tank 4, the other air inlet of the buffer tank 4 is connected to the ozone source through a valve, the air outlet of the buffer tank 4 is connected to the air inlet of the booster pump 5, the exhaust port of the booster pump 5 is connected to the bottom of the ozone reaction tank, forming an ozone cycle, so that the reacted ozone can be atomized again through the ozone cycle and enter the ozone reaction tank for reaction, avoiding the waste of ozone after it emerges and is discharged.

[0055] In the sewage purification method, the atomizing rotary ejector 3 includes a venturi tube 6, which is installed in a pipe opening 24 extending into the bottom of the ozone reaction tank. The atomizing rotary ejector 3 is installed in the pipe opening 24 through a rotating sealing device 14 and a bearing 7. The air inlet end of the venturi tube 6 is connected to the booster pump 5, and the liquid inlet end of the venturi tube 6 is connected to the liquid inlet pipe 13.

[0056] The atomizing rotary injector 3 includes an air duct 8, one end of which is closed and the other end is connected to the air inlet end of the venturi tube 6. Evenly distributed air inlet windows 9 are provided on the side wall of the air duct 8. The air inlet windows 9 connect the inner and outer spaces of the air duct 8. A mounting ring 10 is provided on the outer wall of the air duct 8. The mounting ring 10 is connected to the outer wall of the air duct 8 by evenly distributed driving blades 11. The specific position of the mounting ring 10 is between the air inlet window 9 and the closed end of the air duct 8. A bearing 7 is provided between the outer wall of the mounting ring 10 and the inner wall of the pipe opening 24.

[0057] In the sewage purification method, the discharge end of the venturi tube 6 is connected to the L-shaped elbow 12.

[0058] The L-shaped elbow 12 and the liquid inlet pipe 13 are respectively provided with a spray port and a water suction port along their center lines. The cross sections of the L-shaped elbow 12 and the liquid inlet pipe 13 are both rhombus-shaped, and the L-shaped elbow 12 and the liquid inlet pipe 13 are 180 degrees apart.

[0059] In the sewage purification method, a sewage inlet is provided at one end of the catalytic oxidation tank 1, and a Fenton solution inlet pipe is provided at the sewage inlet.

[0060] In the sewage purification method, a baffle 15 is provided in the catalytic oxidation tank 1.

[0061] In the sewage purification method, the catalytic oxidation tank 1 is provided with a conventional flushing water pipe in order to prevent the formed iron salt from settling to the bottom and flush the iron salt into the sedimentation tank along the direction of the water flow.

[0062] In the sewage purification method, the ozone dosage is 100 mg / L, the reaction cycle of the ozone reaction tank is 40 minutes, the Fenton (H2O2) dosage is 0.2 ml / L, and the Fenton (FeSO4) dosage is 50 mg / L.

[0063] Example 2

[0064] like Figures 1 to 11 As shown, the sewage purification method described in the present invention first introduces ozone into the sewage, and performs a first catalytic oxidation on the sewage by ozone. The ozone-treated sewage is then added to Fenton for catalytic oxidation. Trace iron salts are produced during the Fenton catalytic oxidation process. After catalytic oxidation, the sewage enters the sedimentation tank 2 for precipitation of the iron salts and then is output.

[0065] In the sewage purification method, since ozone is extremely insoluble in water, it will float up and leave the sewage after entering it, so increasing the reaction area can effectively improve the reaction efficiency. Therefore, the present application converts ozone into tiny bubbles, converts sewage into small water droplets, and mixes the ozone tiny bubbles with the small water droplets, so that the contact area can be maximized. After the ozone contacts and reacts with the sewage, it will be sprayed into the accumulated sewage, so that the ozone continues to react with the sewage to catalytically oxidize during the floating process, thereby improving the catalytic oxidation efficiency of ozone on sewage.

[0066] The sewage purification method is in a positive pressure state in the ozone reaction device, wherein the air pressure is 0.15 MPa. The ozone reaction device in a positive pressure state increases the air pressure on the upper surface of the sewage, slowing down the speed at which ozone in the sewage emerges. This allows the ozone to stay in the sewage for a longer time, prolonging the reaction time and improving the utilization rate of the ozone.

[0067] The sewage purification method mentioned above is to stir the sewage up and down in an ozone reaction device to form a swirling flow, thereby driving the bubbles to turn down and prolonging the residence time of the ozone bubbles in the water.

[0068] The sewage purification method of the present invention comprises a catalytic oxidation tank 1 and a sedimentation tank 2, wherein the catalytic oxidation tank 1 is connected to the sedimentation tank 2, and the oxidation tank is also connected to an ozone reaction tank, and the sewage is output after passing through the ozone reaction tank, the catalytic oxidation tank 1 and the sedimentation tank 2 in sequence;

[0069] The ozone reaction tanks are provided with three groups, and the three groups of ozone reaction tanks are controlled by the control device to cyclically inject the preliminarily purified sewage into the catalytic oxidation tank 1 in turn. The purified sewage can be purified continuously, and the preliminarily purified sewage is added to the catalytic oxidation tank 1 and then enters the sedimentation tank 2, and is discharged after sedimentation in the sedimentation tank 2. This structure allows the sewage to be catalytically oxidized by ozone in a sealed environment while ensuring that the sewage can be purified continuously.

[0070] An atomizing rotary ejector 3 is provided at the bottom of the ozone reaction tank. The atomizing rotary ejector 3 is located in a pipe extending into the bottom of the ozone reaction tank, and the other end of the pipe is connected to the air outlet of the booster pump 5.

[0071] A constant pressure valve 23 is provided on the top of the ozone reaction tank, and the air outlet of the constant pressure valve 23 is connected to the air inlet of the buffer tank 4. The other air inlet of the buffer tank 4 is connected to the ozone source through a valve, and the air outlet of the buffer tank 4 is connected to the air inlet of the booster pump 5. The exhaust port of the booster pump 5 is connected to the bottom of the ozone reaction tank and extends into the ozone reaction tank to form an ozone cycle, so that the reacted ozone can be atomized again through the ozone cycle and enter the ozone reaction tank for reaction, thereby avoiding the waste of ozone after it emerges and is discharged.

[0072] In the sewage purification method, the atomizing rotary ejector 3 includes a venturi tube 6, which is installed in a pipe opening 24 extending into the bottom of the ozone reaction tank. The atomizing rotary ejector 3 is installed in the pipe opening 24 through a rotating sealing device 14 and a bearing 7. The air inlet end of the venturi tube 6 is connected to the booster pump 5, and the liquid inlet end of the venturi tube 6 is connected to the liquid inlet pipe 13.

[0073] The atomizing rotary injector 3 includes an air duct 8, one end of which is closed and the other end is connected to the air inlet end of the venturi tube 6. Evenly distributed air inlet windows 9 are provided on the side wall of the air duct 8. The air inlet windows 9 connect the inner and outer spaces of the air duct 8. A mounting ring 10 is provided on the outer wall of the air duct 8. The mounting ring 10 is connected to the outer wall of the air duct 8 by evenly distributed driving blades 11. The specific position of the mounting ring 10 is between the air inlet window 9 and the closed end of the air duct 8. A bearing 7 is provided between the outer wall of the mounting ring 10 and the inner wall of the pipe opening 24.

[0074] In the sewage purification method, the discharge end of the venturi tube 6 is connected to the L-shaped elbow 12.

[0075] The L-shaped elbow 12 and the liquid inlet pipe 13 are respectively provided with a spray port and a water suction port along their center lines. The cross sections of the L-shaped elbow 12 and the liquid inlet pipe 13 are both rhombus-shaped, and the L-shaped elbow 12 and the liquid inlet pipe 13 are 180 degrees apart.

[0076] In the sewage purification method, a sewage inlet is provided at one end of the catalytic oxidation tank 1, and a Fenton solution inlet pipe is provided at the sewage inlet.

[0077] In the sewage purification method, a baffle 15 is provided in the catalytic oxidation tank 1.

[0078] In the sewage purification method, the catalytic oxidation tank 1 is provided with a conventional flushing water pipe in order to prevent the formed iron salt from settling to the bottom and flush the iron salt into the sedimentation tank along the direction of the water flow.

[0079] In the sewage purification method, the ozone dosage is 150 mg / L, the reaction cycle of the ozone reaction tank is 40 minutes, the Fenton (H2O2) dosage is 0.3 ml / L, and the Fenton (FeSO4) dosage is 60 mg / L.

[0080] Example 3

[0081] like Figures 1 to 11 As shown, the sewage purification method described in the present invention first introduces ozone into the sewage, and performs a first catalytic oxidation on the sewage by ozone. The ozone-treated sewage is then added to Fenton for catalytic oxidation. Trace iron salts are produced during the Fenton catalytic oxidation process. After catalytic oxidation, the sewage enters the sedimentation tank 2 for precipitation of the iron salts and then is output.

[0082] In the sewage purification method, since ozone is extremely insoluble in water, it will float up and leave the sewage after entering it, so increasing the reaction area can effectively improve the reaction efficiency. Therefore, the present application converts ozone into tiny bubbles, converts sewage into small water droplets, and mixes the ozone tiny bubbles with the small water droplets, so that the contact area can be maximized. After the ozone contacts and reacts with the sewage, it will be sprayed into the accumulated sewage, so that the ozone continues to react with the sewage to catalytically oxidize during the floating process, thereby improving the catalytic oxidation efficiency of ozone on sewage.

[0083] The sewage purification method is in a positive pressure state in the ozone reaction device, wherein the air pressure is 0.15 MPa. The ozone reaction device in a positive pressure state increases the air pressure on the upper surface of the sewage, slowing down the speed at which ozone in the sewage emerges. This allows the ozone to stay in the sewage for a longer time, prolonging the reaction time and improving the utilization rate of the ozone.

[0084] The sewage purification method mentioned above is to stir the sewage up and down in an ozone reaction device to form a swirling flow, thereby driving the bubbles to turn down and prolonging the residence time of the ozone bubbles in the water.

[0085] The sewage purification method of the present invention comprises a catalytic oxidation tank 1 and a sedimentation tank 2, wherein the catalytic oxidation tank 1 is connected to the sedimentation tank 2, and the oxidation tank is also connected to an ozone reaction tank, and the sewage is output after passing through the ozone reaction tank, the catalytic oxidation tank 1 and the sedimentation tank 2 in sequence;

[0086] The ozone reaction tanks are provided with three groups, and the three groups of ozone reaction tanks are controlled by the control device to cyclically inject the preliminarily purified sewage into the catalytic oxidation tank 1 in turn. The purified sewage can be purified continuously, and the preliminarily purified sewage is added to the catalytic oxidation tank 1 and then enters the sedimentation tank 2, and is discharged after sedimentation in the sedimentation tank 2. This structure allows the sewage to be catalytically oxidized by ozone in a sealed environment while ensuring that the sewage can be purified continuously.

[0087] An atomizing rotary ejector 3 is provided at the bottom of the ozone reaction tank. The atomizing rotary ejector 3 is located in a pipe extending into the bottom of the ozone reaction tank, and the other end of the pipe is connected to the air outlet of the booster pump 5.

[0088] A constant pressure valve 23 is provided on the top of the ozone reaction tank, and the air outlet of the constant pressure valve 23 is connected to the air inlet of the buffer tank 4. The other air inlet of the buffer tank 4 is connected to the ozone source through a valve, and the air outlet of the buffer tank 4 is connected to the air inlet of the booster pump 5. The exhaust port of the booster pump 5 is connected to the bottom of the ozone reaction tank and extends into the ozone reaction tank to form an ozone cycle, so that the reacted ozone can be atomized again through the ozone cycle and enter the ozone reaction tank for reaction, thereby avoiding the waste of ozone after it emerges and is discharged.

[0089] In the sewage purification method, the atomizing rotary ejector 3 includes a venturi tube 6, which is installed in a pipe opening 24 extending into the bottom of the ozone reaction tank. The atomizing rotary ejector 3 is installed in the pipe opening 24 through a rotating sealing device 14 and a bearing 7. The air inlet end of the venturi tube 6 is connected to the booster pump 5, and the liquid inlet end of the venturi tube 6 is connected to the liquid inlet pipe 13.

[0090] The atomizing rotary injector 3 includes an air duct 8, one end of which is closed and the other end is connected to the air inlet end of the venturi tube 6. Evenly distributed air inlet windows 9 are provided on the side wall of the air duct 8. The air inlet windows 9 connect the inner and outer spaces of the air duct 8. A mounting ring 10 is provided on the outer wall of the air duct 8. The mounting ring 10 is connected to the outer wall of the air duct 8 by evenly distributed driving blades 11. The specific position of the mounting ring 10 is between the air inlet window 9 and the closed end of the air duct 8. A bearing 7 is provided between the outer wall of the mounting ring 10 and the inner wall of the pipe opening 24.

[0091] In the sewage purification method, the discharge end of the venturi tube 6 is connected to the L-shaped elbow 12.

[0092] The L-shaped elbow 12 and the liquid inlet pipe 13 are respectively provided with a spray port and a water suction port along their center lines. The cross sections of the L-shaped elbow 12 and the liquid inlet pipe 13 are both rhombus-shaped, and the L-shaped elbow 12 and the liquid inlet pipe 13 are 180 degrees apart.

[0093] In the sewage purification method, a sewage inlet is provided at one end of the catalytic oxidation tank 1, and a Fenton solution inlet pipe is provided at the sewage inlet.

[0094] In the sewage purification method, a baffle 15 is provided in the catalytic oxidation tank 1.

[0095] In the sewage purification method, the catalytic oxidation tank 1 is provided with a conventional flushing water pipe in order to prevent the formed iron salt from settling to the bottom and flush the iron salt into the sedimentation tank along the direction of the water flow.

[0096] In the sewage purification method, the ozone dosage is 100 mg / L, the reaction cycle of the ozone reaction tank is 60 minutes, the Fenton (H2O2) dosage is 0.2 ml / L, and the Fenton (FeSO4) dosage is 50 mg / L.

[0097] Example 4: Fig.11 As shown, based on the structure described in any one of embodiments 1-3, the control device includes a liquid level switch circuit, a circulating water inlet and outlet circuit, and a water charging and discharging control circuit.

[0098] The switch circuit includes a liquid level switch group A, a liquid level switch group B and a liquid level switch group C which are arranged in three groups of ozone reaction tanks, namely, ozone reaction tank A161, ozone reaction tank B162 and ozone reaction tank C163.

[0099] The liquid level switch group A includes the liquid level switch AA171 (the low liquid level switch of the ozone reaction tank A161) and the liquid level switch AB172 (the high liquid level switch of the ozone reaction tank A161);

[0100] Liquid level switch group B includes liquid level switch BA173 (low liquid level switch of ozone reaction tank B162) and liquid level switch BB174 (high liquid level switch of ozone reaction tank B162);

[0101] Liquid level switch group C includes liquid level switch CA175 (low liquid level switch of ozone reaction tank C163) and liquid level switch CB176 (high liquid level switch of ozone reaction tank C163);

[0102] One end of the control coils of liquid level switch AA171, liquid level switch AB172, liquid level switch BA173, liquid level switch BB174, liquid level switch CA175 and liquid level switch CB176 are connected to the DC power supply A251, and the other end is connected to the circulating water supply and drainage circuit and the water charging and discharging control circuit.

[0103] The booster pumps include a booster pump A51, a booster pump B52 and a booster pump C53 which are arranged on three groups of ozone reaction tanks.

[0104] The water charging and discharging control circuit includes a relay group A and a solenoid valve group.

[0105] Relay group A includes relay AA181, relay AB182, relay BA183, relay BB184, relay CA185, and relay CB186;

[0106] The solenoid valve group includes an ozone reaction tank A inlet solenoid valve 191, an ozone reaction tank A discharge solenoid valve 192, an ozone reaction tank B inlet solenoid valve 193, an ozone reaction tank B discharge solenoid valve 194, an ozone reaction tank C inlet solenoid valve 195, and an ozone reaction tank C discharge solenoid valve 196. The ozone reaction tank A inlet solenoid valve 191, the ozone reaction tank B inlet solenoid valve 193, and the ozone reaction tank C inlet solenoid valve 195 are respectively installed on the pipes connecting the ozone reaction tank A161, the ozone reaction tank B162, and the ozone reaction tank C163 with the sewage source. The ozone reaction tank A discharge solenoid valve 192, the ozone reaction tank B discharge solenoid valve 194, and the ozone reaction tank C discharge solenoid valve 196 are respectively installed on the pipes connecting the ozone reaction tank A161, the ozone reaction tank B162, and the ozone reaction tank C163 with the catalytic oxidation tank 1.

[0107] One end of the coil of relay AA181 is connected to the negative pole of DC power supply B252, and the other end is respectively connected to the liquid level switch AA171, the first normally open contact of relay AA181 and the circulating water supply and drainage circuit; the other end of the first normally open contact of relay AA181 is connected to the positive pole of DC power supply B252 through the normally closed contact of relay AB182; the control coil of the inlet solenoid valve 191 of ozone reaction tank A is connected to the positive pole of DC power supply B252 through the second normally open contact of relay AA181; the control coil of the discharge solenoid valve 192 of ozone reaction tank A is connected to the circulating water supply and drainage circuit through the normally closed contact of relay AA181.

[0108] One end of the coil of relay AB182 is connected to the liquid level switch AB172, and the other end is connected to the negative pole of DC power supply B252. The power supply end of booster pump A51 is connected to DC power supply B252 through the normally open contact of relay AB182.

[0109] One end of the coil of relay BA183 is connected to the negative pole of DC power supply B252, and the other end is respectively connected to the liquid level switch BA173, the first normally open contact of relay BA183 and the circulating water supply and drainage circuit; the other end of the first normally open contact of relay BA183 is connected to the positive pole of DC power supply B252 through the normally closed contact of relay BB184; the control coil of the inlet solenoid valve 193 of ozone reaction tank B is connected to the DC power supply B252 through the second normally open contact of relay BA183; the control coil of the discharge solenoid valve 194 of ozone reaction tank B is connected to the circulating water supply and drainage circuit through the normally closed contact of relay BA183, and the other end is connected to the negative pole of DC power supply B252.

[0110] One end of the coil of relay BB184 is connected to the liquid level switch BB174, and the other end is connected to the negative pole of DC power supply B252. The power supply end of booster pump B52 is connected to DC power supply B252 through the normally open contact of relay BB184.

[0111] One end of the coil of relay CA185 is connected to the negative pole of DC power supply B252, and the other end is respectively connected to the liquid level switch CA175, the first normally open contact of relay CA185 and the circulating water supply and drainage circuit; the other end of the first normally open contact of relay CA185 is connected to the positive pole of DC power supply B252 through the normally closed contact of relay CB186; the control coil of the ozone reaction tank C liquid inlet solenoid valve 195 is connected to the DC power supply B252 through the second normally open contact of relay CA185; the control coil of the ozone reaction tank C liquid discharge solenoid valve 196 is connected to the circulating water supply and drainage circuit through the normally closed contact of relay CA185.

[0112] One end of the coil of relay CB186 is connected to the liquid level switch CB176, and the other end is connected to the negative pole of DC power supply B252. The power supply end of booster pump C53 is connected to DC power supply B252 through the normally open contact of relay CB186.

[0113] The circulating water supply and drainage circuit includes a relay group B and a chipset. The chipset uses a traditional control chip, taking LY51S as an example.

[0114] Relay group B includes relay XA201, relay XB202, relay YA203, relay YB204, relay ZA205 and relay ZB206;

[0115] The chipset includes a water replenishment chip 211, a drainage chip A 212, a drainage chip B 213 and a drainage chip C 214.

[0116] One end of the coil of relay XA201 is grounded, and the other end is respectively connected to one end of the push button switch 22, one end of the first normally open contact of relay XA201 and the P1.2 pin of the water replenishment chip 211; the other end of the first normally open contact of relay XA201 is connected to the auxiliary power supply B254 through the normally closed contact of relay XB202 and the voltage divider resistor A in sequence; one end of the second normally open contact of relay XA201 is connected to the auxiliary power supply A253, and the other end is connected to the coil of relay AA181, and the other end of the push button switch 22 is connected to the auxiliary power supply A253.

[0117] One end of the coil of relay XB202 is connected to the liquid level switch AB172, and the other end is grounded; one end of the first normally open contact of relay XB202 is grounded, and the other end is connected to the auxiliary power supply B254 through the voltage divider resistor C, and is connected to the P0.1 pin of the water replenishment chip 211; one end of the second normally open contact of relay XB202 is grounded, and the other end is connected to the auxiliary power supply B254 through the voltage divider resistor F, and is connected to the P0.3 pin of the drainage chip A212;

[0118] One end of the coil of relay YA203 is grounded, and the other end is connected to the P1.0 pin of the water replenishment chip 211 and one end of the first normally open contact of relay YA203; the other end of the first normally open contact of relay YA203 is connected to the auxiliary power supply B254 through the normally closed contact of relay YB204 and the voltage divider resistor A in sequence; one end of the second normally open contact of relay YA203 is connected to the auxiliary power supply A253, and the other end is connected to the coil of relay BA183.

[0119] One end of the coil of relay YB204 is connected to the liquid level switch BB174, and the other end is grounded; one end of the first normally open contact of relay YB204 is grounded, and the other end is connected to the auxiliary power supply B254 through the voltage divider resistor D, and is connected to the P0.2 pin of the water replenishment chip 211; one end of the second normally open contact of relay YB204 is grounded, and the other end is connected to the auxiliary power supply C255 through the voltage divider resistor X, and is connected to the P0.3 pin of the drainage chip B213;

[0120] One end of the coil of relay ZA205 is grounded, and the other end is connected to the P1.1 pin of the water replenishment chip 211 and one end of the first normally open contact of relay ZA205; the other end of the first normally open contact of relay ZA205 is connected to the auxiliary power supply B254 through the normally closed contact of relay ZB206 and the voltage divider resistor A in sequence; one end of the second normally open contact of relay ZA205 is connected to the auxiliary power supply A253, and the other end is connected to the coil of relay CA185.

[0121] One end of the coil of relay ZB206 is connected to the liquid level switch CB176, and the other end is grounded; one end of the first normally open contact of relay ZB206 is grounded, and the other end is connected to the auxiliary power supply B254 through the voltage divider resistor E, and to the P0.3 pin of the water replenishment chip 211; one end of the second normally open contact of relay ZB206 is grounded, and the other end is connected to the auxiliary power supply C255 through the voltage divider resistor Y, and to the P0.3 pin of the drainage chip C214.

[0122] The P1.1 pin of the drainage chip A212 is also connected to the P0.4 pin of the water replenishment chip 211, the P0.0 pin of the drainage chip A212 is connected to the auxiliary power supply B254, and the P1.4 pin of the drainage chip A212 is grounded;

[0123] The P1.1 pin of the drainage chip B213 is also connected to the P0.5 pin of the water replenishment chip 211, the P0.0 pin of the drainage chip B213 is connected to the auxiliary power supply C255, and the P1.4 pin of the drainage chip B213 is grounded;

[0124] The P1.1 pin of the drainage chip C214 is also connected to the P0.6 pin of the water replenishment chip 211, the P0.0 pin of the drainage chip C214 is connected to the auxiliary power supply C255, and the P1.4 pin of the drainage chip C214 is grounded.

[0125] The working principle of this application is:

[0126] In the present application, the ozone reaction tank, the constant pressure valve 23, the buffer tank 4, the booster pump 5, the atomizing rotary ejector 3 and the ozone reaction tank form a first-dimensional cycle to form an ozone reaction tank group. The ozone reaction tank group is to allow ozone to circulate catalytic oxidation and improve the utilization rate of ozone, but only the first-dimensional cycle cannot achieve continuous purification of sewage.

[0127] The three groups of ozone reaction tanks are formed into a cycle, forming a second-dimensional cycle, which reserves a cycle reaction time for each tank. During the cycle, there is always one ozone reaction tank draining water, one ozone reaction tank in the cycle reaction, and the other ozone reaction tank replenishing water.

[0128] When it is first started, the staff presses the button switch 22, the coil of relay XA201 is energized, the normally open contacts of relay XA201 are all closed, the first normally open contact of relay XA201 is closed so that the coil of relay XA201 remains connected to the auxiliary power supply B254, the normally open contacts of relay XA201 are all kept closed, the second normally open contact of relay XA201 remains closed, so that the coil of relay AA181 is energized, and the normally open contact of relay AA181 is closed. The first normally open contact of relay AA181 is closed, so that the coil of relay AA181 is connected to the positive pole of DC power supply B252. All normally open contacts of relay AA181 are closed, the normally closed contacts are disconnected, and there is no high-level signal output from the P1.1 pin of drainage chip A212. The inlet solenoid valve 191 of ozone reaction tank A is energized and turned on, and the discharge solenoid valve 192 of ozone reaction tank A is de-energized to disconnect the water circuit. Pipe 3 connected to the sewage source enters the ozone reactor. Reaction tank A161, until the liquid level reaches the liquid level switch AB172, the liquid level switch AB172 is turned closed, so that the coil of relay AB182 is connected to the DC power supply A251, the normally closed contact of relay AB182 is disconnected, and the normally open contact is closed. The normally closed contact of relay AB182 is disconnected to make the coil of relay AA181 lose power, and the normally open contact and the normally closed contact return to their positions. At this time, the ozone reaction tank A liquid inlet solenoid valve 191 is powered off and the water circuit is disconnected, and the ozone reaction tank A liquid discharge solenoid valve 19 2. Cut off the power supply and disconnect the water circuit. The normally open contact of relay AB182 closes to start the booster pump A51 in ozone reaction tank group A, so that positive pressure appears in ozone reaction tank A161. The constant pressure valve 23 on the top of ozone reaction tank A161 maintains the positive pressure in ozone reaction tank A161 constant within a certain value. If the positive pressure value exceeds the standard, it will be discharged at the constant pressure valve 23 to avoid the risk of explosion. At the same time, maintaining positive pressure in ozone reaction tank A161 can slow down the emergence of ozone micro bubbles from the water. Prolong the residence time of ozone in sewage, improve the reaction efficiency of ozone and the utilization rate of ozone. The emerging ozone will be mixed with new ozone in the circulation pipeline, and will be pumped into ozone reaction tank A161 by booster pump A51 for re-reaction, forming the recycling of ozone, and continuously replenishing ozone during the recycling process to avoid excessive dilution of ozone by oxygen formed by the reaction, resulting in loss of catalytic oxidation ability.

[0129] The liquid level switch AB172 is closed, the coil of relay XB202 is energized, the normally open contact of relay XB202 is closed, and the normally closed contact is disconnected; the normally closed contact of relay XB202 is disconnected, causing the coil of relay XA201 to lose power, and the normally open contact of relay XA201 returns to its position, stopping the water replenishment signal; the first normally open contact of relay XB202 is closed to change the P0.1 pin of the water replenishment chip 211 from a high level to a low level. When the P0.1 pin of the water replenishment chip 211 changes from a high level to a low level, and at the same time, the P0.4 pin of the water replenishment chip 211 does not receive the water discharge signal sent by the P1.1 pin of the drainage chip A212, the P1.0 pin of the water replenishment chip 211 sends a high level signal for 3 seconds. After receiving the high level signal, the coil of relay YA203

[0130] The coil of relay YA203 is energized, and all the normally open contacts of relay YA203 are closed. The first normally open contact of relay YA203 is closed, so that the coil of relay YA203 remains connected to the auxiliary power supply B254. The normally open contacts of relay YA203 remain closed, and the second normally open contact of relay YA203 remains closed, so that the coil of relay BA183 is energized, and the normally open contact of relay BA183 is closed, and the normally closed contact is disconnected. The first normally open contact of relay BA183 is closed, so that the coil of relay BA183 remains connected to the positive pole of DC power supply B252. The normally open contacts of relay BA183 remain closed, and the normally closed contact remains disconnected. There is no high-level signal output from the P1.1 pin of the drainage chip B213. The inlet solenoid valve 193 of ozone reaction tank B is energized and turned on, and the discharge solenoid valve 194 of ozone reaction tank B is de-energized to disconnect the water circuit. Pipe 3 connected to the sewage source enters the ozone reaction tank B162 until When the liquid level reaches the liquid level switch BB174, the liquid level switch BB174 is switched on and closed, so that the coil of relay BB184 is connected to the DC power supply A251, the normally closed contact of relay BB184 is disconnected, and the normally open contact is closed. The normally closed contact of relay BB184 is disconnected, so that the coil of relay BA183 loses power, and the normally open contact and the normally closed contact return to their positions. At this time, the inlet solenoid valve 193 of ozone reaction tank B is powered off and the water circuit is disconnected, and the discharge solenoid valve 194 of ozone reaction tank B is powered off and disconnected. In the water circuit, the normally open contact of relay BB184 is closed to start the booster pump B52 in the ozone reaction tank group B, so that positive pressure appears in the ozone reaction tank B162, and the constant pressure valve 23 on the top of the ozone reaction tank B162 maintains the positive pressure in the ozone reaction tank B162 constant within a certain value. If the positive pressure value exceeds the standard, it will be discharged at the constant pressure valve 23 to avoid the risk of explosion. At the same time, maintaining positive pressure in the ozone reaction tank B162 can slow down the emergence of ozone micro bubbles from the water. Prolong the residence time of ozone in sewage, improve the reaction efficiency of ozone and the utilization rate of ozone. The emerging ozone will be mixed with the new ozone in the circulation pipeline, and will be pumped into the ozone reaction tank B162 by the booster pump B52 for re-reaction, forming the recycling of ozone, and continuously replenishing ozone during the recycling process to avoid excessive dilution of ozone by the oxygen formed by the reaction, resulting in loss of catalytic oxidation ability.

[0131] The second normally open contact of relay XB202 is closed, so that the P0.3 pin of the drainage chip A212 is energized. At this time, the P1.1 pin of the drainage chip A212 does not output a signal. The P0.1 pin needs to change from high level to low level and the P0.3 pin receives the high level signal before the P1.1 pin of the drainage chip A212 outputs a high level signal. The P1.1 pin of the drainage chip A212 outputs a high level signal, and the coil of the ozone reaction tank A drain solenoid valve 192 will open the water path after receiving the signal, and the pretreated sewage after the reaction in the ozone reaction tank A161 will be transported to the catalytic oxidation tank 1 for the next step of treatment. The P0.1 pin of the drainage chip A212 changes from high level to low level, which means that the water in the ozone reaction tank A161 is "full" and the ozone circulation purification begins. The P0.3 pin receives a high level signal, which means that the water in the ozone reaction tank C163 is "full" and the ozone circulation purification begins. That is, when the sewage in the ozone reaction tank A161 and the ozone reaction tank C163 reaches the liquid level switch AB172 and the liquid level switch CB176 respectively, and the liquid level switch is closed, the drainage chip A212 will control the ozone reaction tank A drain solenoid valve 192 to drain.

[0132] Until the P0.2 pin of the drainage chip A212 inputs a high-level signal, the P1.1 pin stops outputting a high-level signal. After the P0.2 pin receives the signal, the P1.0 pin of the drainage chip sends a signal.

[0133] The liquid level switch BB174 is closed, the coil of relay YB204 is energized, the normally open contact of relay YB204 is closed, and the normally closed contact is disconnected; the normally closed contact of relay YB204 is disconnected, causing the coil of relay YA203 to lose power, the normally open contact of relay YA203 to return to its original position, and the water replenishment signal is stopped, and the water replenishment in the ozone reaction tank B162 is stopped; the first normally open contact of relay YB204 is closed to change the P0.2 pin of the water replenishment chip 211 from a high level to a low level. When the P0.2 pin of the water replenishment chip 211 changes from a high level to a low level, and at the same time, the P0.5 pin of the water replenishment chip 211 does not receive the water discharge signal sent by the P1.1 pin of the drainage chip B213 Signal, the P1.1 pin of the water replenishment chip 211 sends a high-level signal for 3 seconds. After receiving the high-level signal, the coil of relay ZA205 is energized, and the normally open contacts of relay ZA205 are all closed. The first normally open contact of relay ZA205 is closed to keep the coil of relay ZA205 connected to the auxiliary power supply B254. The normally open contacts of relay ZA205 are all closed, and the second normally open contact of relay ZA205 is closed, so that the coil of relay CA185 is energized, the normally open contact of relay CA185 is closed, and the normally closed contact is disconnected. The first normally open contact of relay CA185 is closed to make relay C The coil of A185 remains connected to the positive pole of the DC power supply B252, the normally open contacts of the relay CA185 remain all closed, the normally closed contacts remain disconnected, and the P1.1 pin of the drainage chip C214 has no high-level signal output, the ozone reactor C liquid inlet solenoid valve 195 is energized and turned on, the ozone reactor C liquid discharge solenoid valve 196 is de-energized to disconnect the water circuit, and the pipe 3 connected to the sewage source enters the ozone reactor C163 until the liquid level reaches the liquid level switch CB176. The liquid level switch CB176 is toggled closed, so that the coil of the relay CB186 is connected to the DC power supply A251, the normally closed contacts of the relay CB186 are disconnected, the normally open contacts are closed, and the normally closed contacts of the relay CB186 are closed. The disconnection causes the coil of relay CA185 to lose power, and the normally open contact and the normally closed contact return to their positions. At this time, the ozone reaction tank C163 liquid inlet solenoid valve is powered off to disconnect the water circuit, and the ozone reaction tank C discharge solenoid valve 196 is powered off to disconnect the water circuit. The normally open contact of relay CB186 is closed to start the booster pump C53 in the ozone reaction tank group C, so that positive pressure appears in the ozone reaction tank C163, and the constant pressure valve 23 on the top of the ozone reaction tank C163 maintains the positive pressure in the ozone reaction tank C163 constant within a certain value. If the positive pressure value exceeds the standard, it will be discharged at the constant pressure valve 23 to avoid the risk of explosion. At the same time, maintaining positive pressure in the ozone reaction tank C163 can slow down the emergence of ozone micro bubbles from the water. Prolong the residence time of ozone in sewage and improve the reaction efficiency and utilization rate of ozone.The emitted ozone will be mixed with new ozone in the circulation pipeline and pumped into the ozone reaction tank C163 by the booster pump C53 for further reaction, thus forming the recycling of ozone. Ozone is continuously replenished during the recycling process to prevent ozone from being excessively diluted by the oxygen formed by the reaction, resulting in loss of catalytic oxidation ability.

[0134] The second normally open contact of relay YB204 is closed, so that the P0.3 pin of the drainage chip B213 is energized. At this time, the P1.1 pin of the drainage chip B213 does not output a signal. The P0.1 pin needs to change from a high level to a low level and the P0.3 pin receives a high level signal before the P1.1 pin of the drainage chip A212 outputs a high level signal; the P1.1 pin of the drainage chip B213 outputs a high level signal, and the coil of the ozone reaction tank B drain solenoid valve 194 will open the water path after receiving the signal, and the pretreated sewage after the reaction in the ozone reaction tank B162 will be transported to the catalytic oxidation tank 1 for the next step of treatment. The P0.1 pin of the drainage chip B213 changes from high level to low level, which means that the water in the ozone reaction tank B162 is "full", and the ozone circulation purification begins. The P0.3 receives a high level signal, which means that the water in the ozone reaction tank A161 is "full", and the ozone circulation purification begins. That is, when the sewage in the ozone reaction tank B162 and the ozone reaction tank A161 reach the liquid level switch BB174 and the liquid level switch AB172 respectively, and the liquid level switch is closed, the drainage chip B213 will control the ozone reaction tank B drain solenoid valve 194 to drain water.

[0135] Until the P0.2 pin of the drainage chip B213 inputs a high-level signal, that is, the water level reaches the liquid level switch BA173 to close the liquid level switch BA173, and the P1.1 pin stops outputting a high-level signal, that is, the ozone reactor B162 stops draining water. After the P0.2 pin of the drainage chip B213 receives the signal, the P1.0 pin of the drainage chip B213 sends a signal to the P0.1 pin of the drainage chip C214.

[0136] The liquid level switch CB176 is closed, the coil of relay ZB206 is energized, the normally open contact of relay ZB206 is closed, and the normally closed contact is disconnected; the normally closed contact of relay ZB206 is disconnected, causing the coil of relay ZA205 to lose power, the normally open contact of relay ZA205 to return to its position, and the water replenishment signal is stopped, and the water replenishment in the ozone reaction tank C163 is stopped; the first normally open contact of relay ZB206 is closed to change the P0.3 pin of the water replenishment chip 211 from a high level to a low level. When the P0.3 pin of the water replenishment chip 211 changes from a high level to a low level, and at the same time the P0.6 pin of the water replenishment chip 211 does not receive the water discharge signal sent by the P1.1 pin of the drainage chip C214, the P1.2 pin of the water replenishment chip 211 sends a high level signal of 3 seconds to the coil of relay XA201.

[0137] The second normally open contact of relay ZB206 is closed, so that the P0.3 pin of the drainage chip C214 is energized. At this time, the P1.1 pin of the drainage chip C214 does not output a signal. The P0.1 pin needs to change from a high level to a low level and the P0.3 pin receives a high level signal before the P1.1 pin of the drainage chip C214 outputs a high level signal; the P1.1 pin of the drainage chip C214 outputs a high level signal, and the coil of the ozone reaction tank C discharge solenoid valve 196 will open the water path after receiving the signal, and the pretreated sewage after the reaction in the ozone reaction tank C163 will be transported to the catalytic oxidation tank 1 for the next step of treatment. The P0.1 pin of the drainage chip C214 changes from high level to low level, which means that the water in the ozone reaction tank C163 is "full", and the ozone circulation purification begins. The P0.3 pin receives a high level signal, which means that the water in the ozone reaction tank C163 is "full", and the ozone circulation purification begins. That is, when the sewage in the ozone reaction tank C163 and the ozone reaction tank A161 reach the liquid level switch CB176 and the liquid level switch AB172 respectively, and the liquid level switch is closed, the drainage chip C214 will control the ozone reaction tank C drain solenoid valve 196 to drain.

[0138] Until the P0.2 pin of the drainage chip C214 inputs a high-level signal, that is, the water level reaches the liquid level switch CA175, which closes the liquid level switch CA175, and the P1.1 pin stops outputting a high-level signal, that is, the ozone reactor C163 stops draining water. After the P0.2 pin of the drainage chip C214 receives the signal, the P1.0 pin of the drainage chip C214 sends a signal to the P0.1 pin of the drainage chip A212.

[0139] After completing one control cycle, ozone reaction tank A161, ozone reaction tank B162 and ozone reaction tank C163 use this cycle to replenish water and drain water.

[0140] The treatment results of the embodiment of the industrial wastewater treatment experiment using a wastewater purification method of the present invention were tested to measure the removal efficiency of COD and BOD in the wastewater by the device, and the Fenton treatment alone was used as comparative example 1, and the ozone catalytic oxidation treatment alone was used as comparative example 2 for comparison. The results are shown in Table 1:

[0141] Table 1. Test results

[0142]

[0143] By comparison, the present application can achieve a slightly better effect than Fenton, which has a stronger catalytic oxidation ability, on the basis of a significant reduction in the use of Fenton and ozone. At the same time, the amount of iron oxide produced is far lower than the iron salt produced by Fenton's independent catalytic oxidation.

[0144] By comparison, increasing the dosage of ozone and Fenton in this technical solution does not significantly improve the purification effect, but increasing the ozone circulation reaction time can significantly improve the treatment efficiency. It can be proved that after the ozone circulation reaction, the COD and BOD contents in the treated sewage have been reduced a lot, that is, the concentration has been reduced. At this time, adding Fenton for treatment will not reduce the catalytic oxidation ability of Fenton due to the influence of side reactions, and can effectively improve the treatment efficiency of Fenton for COD and BOD.

Claims

1. A sewage purification method, characterized in that: A sewage purification device is provided, comprising a catalytic oxidation tank (1) and a sedimentation tank (2), wherein the catalytic oxidation tank (1) is connected to the sedimentation tank (2), and the catalytic oxidation tank (1) is also connected to an ozone reaction tank; A constant pressure valve (23) is provided on the top of the ozone reaction tank, and a pressure boosting port is provided on the ozone reaction tank, and a pressure boosting pump (5) is connected to the pressure boosting port; The gas outlet of the constant pressure valve (23) is connected to the gas inlet of the buffer tank (4), the other gas inlet of the buffer tank (4) is connected to the ozone source through a valve, the gas outlet of the buffer tank (4) is connected to the gas inlet of the booster pump (5), the exhaust port of the booster pump (5) is connected to the bottom of the ozone reaction tank and extends into the ozone reaction tank, forming an ozone cycle, so that the reacted ozone can be atomized again through the ozone cycle and enter the ozone reaction tank for reaction, thereby avoiding the waste of ozone after it is discharged; An atomizing rotary ejector (3) is provided at the bottom of the ozone reaction tank. The atomizing rotary ejector (3) is installed in a pipe opening (24) extending into the bottom of the ozone reaction tank. The other end of the pipe opening (24) is connected to the air outlet of the booster pump (5). The atomizing rotary ejector (3) is installed in the pipe opening (24) via a rotary sealing device (14) and a bearing (7). The atomizing rotary ejector (3) comprises an air guide pipe (8) and a venturi tube (6). The air inlet end of the venturi tube (6) is connected to the booster pump (5). The venturi tube (6) is connected to an ozone source via the booster pump. One end of the air guide pipe (8) is closed, and the other end is connected to the air inlet end of the venturi tube (6). The side wall of the air guide pipe (8) is provided with evenly distributed air inlet windows (9). The air inlet windows ( 9) connecting the inner and outer spaces of the air guide pipe (8), a mounting ring (10) is provided on the outer wall of the air guide pipe (8), the mounting ring (10) and the outer wall of the air guide pipe (8) are connected via evenly distributed driving blades (11), the specific position of the mounting ring (10) is between the air inlet window (9) and the closed end of the air guide pipe (8), and a bearing (7) is provided between the outer wall of the mounting ring (10) and the inner wall of the pipe opening (24); the discharge end of the venturi pipe (6) is connected to the L-shaped elbow (12); the liquid inlet end of the venturi pipe (6) is connected to the liquid inlet pipe (13), the L-shaped elbow (12) and the liquid inlet pipe (13) are respectively provided with a spray port and a water suction port along their center lines, and the cross-sections of the L-shaped elbow (12) and the liquid inlet pipe (13) are both rhombus-shaped; The sewage purification method comprises adding a catalytic oxidant to the sewage in a catalytic oxidation tank (1) for catalytic oxidation, the sewage after catalytic oxidation enters a sedimentation tank (2) for inorganic salt precipitation and then is discharged, before the sewage is catalytically oxidized, ozone is first introduced into the sewage for purification, the ozone circulates in the sewage, after the ozone purification is completed, the ozone reaction tank discharges the treated sewage into the catalytic oxidation tank (1) under the control of a control device, and then adds a catalytic oxidant for catalytic oxidation.

2. The sewage purification method according to claim 1, characterized in that: The catalytic oxidant is Fenton's reagent.

3. The sewage purification method according to claim 1, characterized in that: Ozone and sewage are atomized into gas and liquid and then sprayed into the sewage.

4. The sewage purification method according to claim 2, characterized in that: The wastewater is purified in the ozone reaction tank, which is in a positive pressure state.

5. The sewage purification method according to claim 4, characterized in that: The wastewater is cycloned in the ozone reaction tank.

6. The sewage purification method according to claim 1, characterized in that: A baffle (15) is provided in the catalytic oxidation tank (1).

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