An ozone catalytic oxidation system and process for multiphase extract treatment

Abstract

The present invention discloses an ozone catalytic oxidation system and process for multiphase extract treatment, and relates to the technical field of environmental wastewater enhanced treatment. The system comprises an outer reaction tube and an inner reaction tube, and the outer periphery of the bottom and the middle of the inner reaction tube are respectively sleeved with a first catalytic component and a second catalytic component, and the catalyst is a copper-cerium bimetallic ceramsite catalyst. The process comprises the following steps: S1, liquid inlet; S2, turbulent catalysis; S3, reflux; S4, backwashing. The present invention can increase the disturbance of water flow by establishing a water outlet circulation, so that the inner and outer reaction tubes present a good turbulent state, and through the countercurrent contact of ozone with the multiphase extract in the inner water inlet pipe and the outer reaction tube and the mixed contact with the multiphase extract in the two-layer catalyst assembly, the contact effect of the ozone catalyst and the ozone gas is increased, and the contact time between the wastewater and the ozonated air is prolonged, thereby improving the solubility of ozone in water.

Description

Technical Field

[0001] The invention relates to the technical field of enhanced treatment of environmental wastewater, and in particular to an ozone catalytic oxidation system and process for multiphase extract treatment. Background Art

[0002] Ozone is a strong oxidant that has a strong oxidative degradation effect on organic matter in water. It can convert complex organic matter into simple organic matter, achieve decolorization, deodorization, reduce COD and improve biodegradability. Excess ozone can decompose into oxygen by itself without secondary pollution. Because ozone reacts with organic matter quickly, effectively, without secondary pollution, and can be produced on site, the raw materials are easy to obtain, easy to use, and the technical equipment is reliable, it is currently used more and more in industrial wastewater treatment, mainly for deep treatment of wastewater, thus playing a dual role: one is to ensure that the sewage meets the discharge standards, and the other is to achieve the reuse of reclaimed water to achieve the recycling of water resources.

[0003] Multiphase extraction technology is an efficient and environmentally friendly in-situ remediation technology for contaminated land. It extracts soil gas, groundwater and floating oil layers from underground contaminated areas to the ground for phase separation and treatment to achieve the treatment effect. The multiphase extract obtained by phase separation has the characteristics of complex components, difficult biodegradation, and large fluctuations in water quality and quantity. It can only be treated by physical and chemical methods. Catalytic ozonation technology promotes the degradation of organic matter and improves the mineralization rate by producing active oxygen. It has the characteristics of high efficiency and no secondary pollution.

[0004] The ozone catalytic oxidation process of internal circulation ozone combined with ozone catalyst can effectively catalyze the ozonation of multiple extracts, improve the degradation rate of organic matter, and accelerate the oxidation process. It reduces the amount of OH generated, enhances the shielding effect on chloride ions, and strengthens the catalytic effect. The turbulent state of the water flow is enhanced by circulating the internal and external reaction cylinders (1), and the adaptation to changes in water quality and water quantity is enhanced while promoting three-phase mixing, which is beneficial to the performance of the catalyst, improves the ozone catalytic oxidation effect, and reduces the investment and operating costs of the ozone oxidation technology.

[0005] However, the catalysts commonly used in ozone are relatively fixed, which leads to the catalytic effect gradually decreasing with the increase of time. For example, patent CN205367992U discloses a composite ozone catalytic oxidation, including at least one catalyst catalytic ozone oxidation tower section, at least one photocatalytic ozone oxidation tower section, and at least one synergistic ozone oxidation tower section, each tower section is connected by a flange; the upper part of the top tower section is provided with a first reserved port, the top is provided with an exhaust port, and the lower part of the bottom tower section is provided with a second reserved port; the inside is provided with a composite multi-oxidant addition pipeline for adding a composite multi-oxidant from the outside to the inside, the pipeline runs through each tower section and the wall of the pipeline is provided with composite multi-oxidant addition holes; the three technologies of photocatalytic ozone oxidation, synergistic ozone oxidation and catalyst catalytic ozone oxidation can be combined in one, so as to improve the utilization rate and oxidation efficiency of ozone to a greater extent. However, the device also has the same problems as above, so it is necessary to optimize the ozone catalytic oxidation system and process in a targeted manner to ensure the continuous, efficient and stable catalytic efficiency. Summary of the invention

[0006] In view of the above-mentioned problems, the present invention provides an ozone catalytic oxidation system and process for multi-phase extract treatment.

[0007] The technical solution of the present invention is:

[0008] An ozone catalytic oxidation system for multiphase extract treatment comprises an outer reaction tube and an inner reaction tube, wherein the inner reaction tube is located at the inner center of the outer reaction tube;

[0009] A top cover is provided on the top of the outer reaction cylinder, a water inlet joint is provided at the center of the top of the inner reaction cylinder, the water inlet joint is fixedly connected to the bottom of the top cover, a main water inlet pipe is provided on one side of the water inlet joint, an inner water inlet pipe is provided in the middle of the inner reaction cylinder, the inner water inlet pipe is connected to the main water inlet pipe, the bottom of the inner water inlet pipe penetrates the inner reaction cylinder and extends to the inner bottom of the outer reaction cylinder, the outer periphery of the bottom and the middle of the inner reaction cylinder are respectively sleeved with a first catalytic component and a second catalytic component, a reflux window is provided on each side of the top of the inner reaction cylinder, two lifting pipes are symmetrically provided inside the inner reaction cylinder, the top of the lifting pipe penetrates the top of the inner reaction cylinder and is connected to the air pipe located above the top cover, a reflux pipe is provided on one side of the top of the two lifting pipes, the reflux pipe is connected to the inner water inlet pipe after penetrating the water inlet joint, a main drain pipe and a backwash drain pipe are provided on the top of the side wall of the outer reaction cylinder, a microporous diffuser is provided at the inner bottom of the outer reaction cylinder and corresponding to the inner water inlet pipe, and a plurality of microporous diffusers are provided circumferentially at the inner bottom of the outer reaction cylinder and corresponding to the first catalytic component and the second catalytic component;

[0010] The first catalytic component includes a first catalyst disk, which is rotatably connected to the inner reaction tube. The second catalytic component includes a second catalyst disk, which is slidably connected to the inner wall of the outer reaction tube. The first catalyst disk and the second catalyst disk are both filled with catalysts.

[0011] Furthermore, the catalyst is a copper-cerium bimetallic ceramsite catalyst, the ratio of the diameter of the lifting pipe to the air pipe is 5:3, the ratio of the distance between the first catalytic component and the second catalytic component to the height of the outer reaction tube is 1:6, the ratio of the diameter of the outer reaction tube to the height is 1:6, and the ratio of the diameter of the inner reaction tube to the outer reaction tube is 1:3.

[0012] Description: This catalyst can play a good catalytic oxidation effect. Through the optimized design of the catalyst component and the design of the air pipe and the riser pipe diameter, the contact effect between the ozone catalyst and the ozone gas is increased.

[0013] Furthermore, a first rotating ring is provided for sliding sealing at the center of the top cover, two connecting rods are symmetrically provided at the bottom of the first rotating ring, the connecting rods are located on both sides of the inner reaction tube and are close to the outer wall of the inner reaction tube, a second rotating ring is provided on the outer wall of the middle part of the inner reaction tube, a plurality of auxiliary connecting rods are provided at equal intervals at the bottom of the second rotating ring, each auxiliary connecting rod is provided with an auxiliary baffle near its bottom position, the auxiliary baffle is fixedly connected to the bottom of the first catalyst disk, a special-shaped baffle is provided at the bottom of the auxiliary connecting rod, the special-shaped baffle is provided with a protrusion at the position corresponding to each auxiliary connecting rod, spring rods with the same number as the auxiliary connecting rods are provided at equal intervals at the bottom of the inner reaction tube, the middle part of the spring rod is connected to the outer wall of the inner reaction tube by a spring, the top of the spring rod is aligned with the outer edge of the special-shaped baffle, and a third catalyst disk is provided on the outside of the top of the spring rod.

[0014] Note: The setting of the first rotating ring can achieve relative rotation with the top cover, thereby driving the first catalyst disk to rotate while maintaining stability, strengthening the contact between the catalyst inside the first catalyst disk and the multiphase extract, and improving the catalytic effect. At the same time, the setting of the special-shaped baffle can cooperate with the spring rod to complete reciprocating motion, so that the third catalyst disk can reciprocate, further improving the catalytic effect.

[0015] Furthermore, the first rotating ring is engaged and rotatably connected with a slot provided inside the top cover, a driving motor for driving the first rotating ring to rotate is provided on one side of the top cover, a gear is provided at the output end of the driving motor, and the gear is meshed and connected with a tooth groove provided on the upper surface of the first rotating ring, and there are four auxiliary connecting rods.

[0016] Note: The first rotating ring is driven by setting the driving motor.

[0017] Furthermore, the first catalyst disk and the second catalyst disk are mesh structures with an open top, the third catalyst disk is an integral mesh structure, a first stirring rod is provided at the end of the third catalyst disk, the end of the first stirring rod extends into the interior of the first catalyst disk, and a stirring fixing rod is provided at the end of the first stirring rod.

[0018] Description: The setting of the mesh structure can make the catalyst fully contact with the multiphase extracting liquid without falling or overflowing. The setting of the stirring fixed rod can stir the catalyst inside the first catalyst disk while making reciprocating motion with the third catalyst disk, thereby improving the catalytic effect and achieving functional diversity.

[0019] Furthermore, two second stirring rods are symmetrically provided on the top surface of the second rotating ring, and the end of the second stirring rod is rotatably connected to a stirring rotating rod, and the stirring rotating rod extends to the inside of the second catalyst disk, and a push rod motor is provided on the bottom surface of the top cover, and the output end of the push rod motor is connected to the first telescopic rod, and the bottom of the first telescopic rod is connected to the bottom of the second catalyst disk. A second telescopic rod for maintaining the stability of the second catalyst disk is provided on the bottom surface of the top rod on the symmetrical side of the first telescopic rod, and the bottom of the second telescopic rod is connected to the bottom of the second catalyst disk. The inner wall of the second catalyst disk is provided with a plurality of grooves, and when the second catalyst disk slides down to the bottom of the outer reaction tube, the grooves are docked with the third catalyst disk.

[0020] Description: By setting the stirring rotating rod, the first rotating ring can drive it to stir the catalyst inside the second catalyst disk when rotating, and will not collide with the first telescopic rod and the second telescopic rod to get stuck.

[0021] Furthermore, a sliding block is provided on each side of the outer wall of the second catalyst disk, and the sliding block is slidably connected to a sliding groove provided on the inner wall of the outer reaction tube.

[0022] Note: The second catalyst plate can slide up and down by setting the slider and the slide groove, so as to facilitate backwashing.

[0023] Furthermore, a two-way air-permeable valve is provided on one side of the top of the top cover, and a one-way valve is provided in the middle of the inner water inlet pipe.

[0024] Note: The two-way air-permeable valve can be used to adjust the internal pressure of the outer reaction cylinder, and the one-way valve can be used to make the multiphase extractant in the inner water inlet pipe flow in one direction to avoid backflow.

[0025] An ozone catalytic oxidation system for multiphase extract treatment as described in any one of the above items for multiphase extract treatment comprises the following steps:

[0026] S1. Liquid inlet: The multiphase extract to be treated is injected from the main water inlet pipe, and then enters the inner water inlet pipe. The microporous diffuser corresponding to the inner water inlet pipe is opened to inject ozone into the inner water inlet pipe, so that the multiphase extract and ozone are initially in countercurrent contact;

[0027] S2, turbulent catalysis: the multiphase extract flows out from the bottom of the inner water inlet pipe into the outer reaction tube, the microporous diffusers corresponding to the first catalytic component and the second catalytic component are opened to inject ozone into the outer reaction tube, so that the multiphase extract forms a turbulent state with the ozone during the rising process, and then the multiphase extract flows through the first catalyst disk and the second catalyst disk in turn, and the catalysts inside the first catalyst disk and the second catalyst disk catalytically oxidize the multiphase extract;

[0028] S3, reflux: when the multiphase extract flows through the upper part of the outer reaction tube, a part of the multiphase extract flows back to the inner reaction tube from the reflux window, the air pump connected to the air pipe is turned on to generate negative pressure in the air pipe under the action of aeration, and the multiphase extract in the inner reaction tube enters the riser, and then enters the inner water inlet pipe through the reflux pipe at the top of the riser, thus repeating the above steps S1 to S2, and the rest of the multiphase extract is discharged from the main drain pipe;

[0029] S4. Backwashing: Open all microporous diffusers to inject water for flushing, flush the catalyst inside the first catalyst disk and the second catalyst disk, and the flushing wastewater is discharged from the backwash drain pipe.

[0030] The beneficial effects of the present invention are:

[0031] (1) The ozone catalytic oxidation system for multiphase extract treatment of the present invention can increase water flow disturbance by establishing a water outlet circulation, so that the inner and outer reaction tubes present a good turbulent state, and through the countercurrent contact of ozone with the multiphase extract in the inner water inlet pipe and the outer reaction tube and the mixed contact with the multiphase extract in the two-layer catalyst assembly, the contact effect between the ozone catalyst and the ozone gas is increased, the ratio of the height to the diameter of the inner and outer reaction tubes is optimized, and the contact time between the wastewater and the ozonated air is prolonged, thereby improving the solubility of ozone in water, achieving full contact and mixing of gas and water, and optimizing the flow state of gas and liquid in the inner and outer reaction tubes.

[0032] (2) The ozone catalytic oxidation system for multiphase extract treatment of the present invention can realize relative rotation with the top cover through the setting of the first rotating ring, thereby driving the first catalyst disk to rotate while maintaining stability, strengthening the contact between the catalyst inside the first catalyst disk and the multiphase extract, and improving the catalytic effect. At the same time, the setting of the special-shaped baffle can cooperate with the spring rod to complete the reciprocating motion, so that the third catalyst disk can reciprocate, further improving the catalytic effect; the setting of the mesh structure can make the catalyst fully contact with the multiphase extract and will not fall or overflow; the setting of the stirring fixed rod can make it stir the catalyst inside the first catalyst disk while reciprocating with the third catalyst disk, thereby extending the contact time between the catalyst and the multiphase extract, improving the catalytic effect, and realizing functional diversity; the setting of the stirring rotating rod can make the first rotating ring drive it to stir the catalyst inside the second catalyst disk when rotating, and will not collide with the first telescopic rod and the second telescopic rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the ozone catalytic oxidation system of the present invention;

[0034] Figure 2 It is a schematic diagram of the internal structure of the ozone catalytic oxidation system of the present invention;

[0035] Figure 3 It is a schematic diagram of the bottom structure of the ozone catalytic oxidation system of the present invention;

[0036] Figure 4 It is a schematic diagram of the outer bottom structure of the reaction tube in the ozone catalytic oxidation system of the present invention;

[0037] Figure 5 It is a schematic diagram of the internal main view and internal water inlet pipe structure of the ozone catalytic oxidation system of the present invention;

[0038] Figure 6 It is a schematic diagram of the internal main view and the riser structure of the ozone catalytic oxidation system of the present invention;

[0039] Figure 7 It is a cross-sectional view of the connection structure between the top cover and the first rotating ring of the ozone catalytic oxidation system of the present invention;

[0040] Figure 8 It is a partially enlarged schematic diagram of the second stirring rod and the stirring rotating rod of the ozone catalytic oxidation system of the present invention.

[0041] Among them, 1-external reaction cylinder, 11-top cover, 12-main drain pipe, 13-backwash drain pipe, 14-microporous diffuser, 15-card slot, 16-air pipe, 17-chute, 18-two-way air valve, 2-inner reaction cylinder, 21-water inlet joint, 22-inner water inlet pipe, 23-reflux window, 24-lift pipe, 25-reflux pipe, 26-check valve, 3-main water inlet pipe, 4-first catalytic component, 41-first catalyst plate, 42-stirring fixed rod, 5-second catalytic component Parts, 51-second catalyst plate, 52-slot, 53-slider, 6-push rod motor, 61-first telescopic rod, 62-second telescopic rod, 7-first rotating ring, 71-connecting rod, 72-driving motor, 73-gear, 74-tooth groove, 8-second rotating ring, 81-auxiliary connecting rod, 82-auxiliary baffle, 83-special-shaped baffle, 84-second stirring rod, 85-stirring rotating rod, 9-spring rod, 91-spring, 92-third catalyst plate, 93-first stirring rod. DETAILED DESCRIPTION

[0042] Example 1

[0043] like Figure 1 , 2 As shown, an ozone catalytic oxidation system for multiphase extract treatment includes an outer reaction tube 1 and an inner reaction tube 2, wherein the inner reaction tube 2 is located at the center of the outer reaction tube 1;

[0044] like Figure 2 , 5 As shown in Figure 6, a top cover 11 is provided on the top of the outer reaction tube 1, a water inlet joint 21 is provided at the center of the top of the inner reaction tube 2, the water inlet joint 21 is fixedly connected to the bottom of the top cover 11, a main water inlet pipe 3 is provided on one side of the water inlet joint 21, an inner water inlet pipe 22 is provided in the middle of the inner reaction tube 2, the inner water inlet pipe 22 is connected to the main water inlet pipe 3, the bottom of the inner water inlet pipe 22 passes through the inner reaction tube 2 and then extends to the bottom of the outer reaction tube 1, the outer periphery of the bottom and the middle of the inner reaction tube 2 is respectively sleeved with a first catalytic component 4 and a second catalytic component 5, a reflux window 23 is provided on both sides of the top of the inner reaction tube 2, two riser pipes 24 are symmetrically provided inside the inner reaction tube 2, and the top of the riser pipe 24 passes through the inner reaction tube 2. After passing through the top of the inner reaction tube 2, it is connected to the air pipe 16 located above the top cover 11. A return pipe 25 is provided on one side of the top of each of the two lifting pipes 24. The return pipe 25 passes through the water inlet joint 21 and is connected to the inner water inlet pipe 22. A main drain pipe 12 and a backwash drain pipe 13 are provided on the top of the side wall of the outer reaction tube 1. A microporous diffuser 14 is provided at the bottom of the inner reaction tube 1 and corresponding to the inner water inlet pipe 22. A plurality of microporous diffusers 14 are provided circumferentially at the bottom of the inner reaction tube 1 and corresponding to the first catalytic component 4 and the second catalytic component 5. A two-way air permeable valve 18 is provided on one side of the top of the top cover 11, and a one-way valve 26 is provided in the middle of the inner water inlet pipe 22.

[0045] like Figure 2 , 3 As shown, the first catalytic component 4 includes a first catalyst disc 41, which is rotatably connected to the inner reaction tube 2, and the second catalytic component 5 includes a second catalyst disc 51, which is slidably connected to the inner wall of the outer reaction tube 1 up and down. The first catalyst disc 41 and the second catalyst disc 51 are both filled with catalysts, and the catalyst is a copper-cerium bimetallic ceramsite catalyst. The ratio of the diameter of the lifting pipe 24 to the air pipe 16 is 5:3, the ratio of the spacing between the first catalytic component 4 and the second catalytic component 5 to the height of the outer reaction tube 1 is 1:6, the ratio of the diameter of the outer reaction tube 1 to the height is 1:6, and the ratio of the diameter of the inner reaction tube 2 to the outer reaction tube 1 is 1:3;

[0046] like Figure 3 , 6 As shown in , 7 and 8, a first rotating ring 7 is provided at the center of the top cover 11 for sliding sealing, two connecting rods 71 ​​are symmetrically provided at the bottom of the first rotating ring 7, the connecting rods 71 ​​are located on both sides of the inner reaction tube 2 and are close to the outer wall of the inner reaction tube 2, a second rotating ring 8 is sleeved on the outer wall of the middle part of the inner reaction tube 2, four auxiliary connecting rods 81 are provided at equal intervals in the circumferential direction at the bottom of the second rotating ring 8, each auxiliary connecting rod 81 is provided with an auxiliary baffle 82 near its bottom position, the auxiliary baffle 82 is fixedly connected to the bottom of the first catalyst disk 41, a special-shaped baffle 83 is provided at the bottom of the auxiliary connecting rod 81, and the special-shaped baffle 83 is provided with a convex The bottom of the inner reaction tube 2 is provided with spring rods 9 with the same number as the auxiliary connecting rods 81 at equal intervals in the circumferential direction. The middle of the spring rod 9 is connected to the outer wall of the inner reaction tube 2 through a spring 91. The top of the spring rod 9 is aligned with the outer edge of the special-shaped baffle 83. A third catalyst disk 92 is provided on the outer side of the top of the spring rod 9. The first rotating ring 7 is engaged and rotatably connected with the card slot 15 provided inside the top cover 11. A driving motor 72 for driving the first rotating ring 7 to rotate is provided on one side of the top cover 11. The driving motor 72 is a commercially available driving motor. A gear 73 is provided at the output end of the driving motor 72. The gear 73 is meshed and connected with a tooth groove 74 provided on the upper surface of the first rotating ring 7.

[0047] like Figures 2 to 4As shown, the first catalyst disk 41 and the second catalyst disk 51 are mesh structures with top openings, the third catalyst disk 92 is an integral mesh structure, a first stirring rod 93 is provided at the end of the third catalyst disk 92, the end of the first stirring rod 93 extends to the inside of the first catalyst disk 41, and a stirring fixed rod 42 is provided at the end of the first stirring rod 93, two second stirring rods 84 are symmetrically provided on the top surface of the second rotating ring 8, and a stirring rotating rod 85 is rotatably connected at the end of the second stirring rod 84, and the stirring rotating rod 85 extends to the inside of the second catalyst disk 51, and a push rod motor 6 is provided on the bottom surface of the top cover 11, and the push rod motor 6 is a commercially available push rod motor. The output end is connected to the first telescopic rod 61, the bottom of the first telescopic rod 61 is connected to the bottom inner of the second catalyst disk 51, and the bottom surface of the top rod on the symmetrical side of the first telescopic rod 61 is provided with a second telescopic rod 62 for maintaining the stability of the second catalyst disk 51, the bottom of the second telescopic rod 62 is connected to the bottom inner of the second catalyst disk 51, and the inner wall of the second catalyst disk 51 is provided with 4 grooves 52. When the second catalyst disk 51 slides down to the bottom of the outer reaction tube 1, the grooves 52 and the third catalyst disk 92 are docked with each other, and a slider 53 is provided on each side of the outer wall of the second catalyst disk 51, and the slider 53 is slidably connected to the slide groove 17 provided on the inner wall of the outer reaction tube 1.

[0048] Example 2

[0049] The difference between this embodiment and the first embodiment is that the number of auxiliary connecting rods 81 is different.

[0050] There are five auxiliary connecting rods 81 , and thus there are five auxiliary baffles 82 , spring rods 9 , springs 91 , third catalyst disks 92 , first stirring rods 93 , stirring fixed rods 42 , and slots 52 .

[0051] Example 3

[0052] The difference between this embodiment and the first embodiment is that the number of auxiliary connecting rods 81 is different.

[0053] There are five auxiliary connecting rods 81 , and further, there are three auxiliary baffles 82 , spring rods 9 , springs 91 , third catalyst disks 92 , first stirring rods 93 , stirring fixed rods 42 , and slots 52 .

[0054] Example 4

[0055] This embodiment is an ozone catalytic oxidation process for treating a multiphase extract in an ozone catalytic oxidation system for treating a multiphase extract in Embodiment 1, comprising the following steps:

[0056] S1, liquid inlet: the multiphase extract to be treated is injected from the main water inlet pipe 3, and then enters the inner water inlet pipe 22, and the microporous diffuser 14 corresponding to the inner water inlet pipe 22 is opened to inject ozone into the inner water inlet pipe 22, so that the multiphase extract and ozone are initially in countercurrent contact;

[0057] S2, turbulent catalysis: the multiphase extract flows out from the bottom of the inner water inlet pipe 22 into the outer reaction tube 1, and the microporous diffusers 14 corresponding to the first catalyst assembly 4 and the second catalyst assembly 5 are opened to inject ozone into the outer reaction tube 1, so that the multiphase extract forms a turbulent state with the ozone during the rising process, and then the multiphase extract flows through the first catalyst disk 41 and the second catalyst disk 51 in sequence, and the catalysts inside the first catalyst disk 41 and the second catalyst disk 51 catalytically oxidize the multiphase extract;

[0058] S3, reflux: when the multiphase extract flows through the upper part of the outer reaction tube 1, a part of the multiphase extract flows back to the inner reaction tube 2 through the reflux window 23, the air pump connected to the air pipe 16 is turned on to generate negative pressure in the air pipe 16 under the action of aeration, and the multiphase extract in the inner reaction tube 2 enters the riser, and then enters the inner water inlet pipe 22 through the reflux pipe 25 at the top of the riser, thereby repeating the above steps S1 to S2 again, and the rest of the multiphase extract is discharged from the main drainage pipe 12;

[0059] S4, backwashing: open all the microporous diffusers 14 to inject water for flushing, flush the catalyst inside the first catalyst disk 41 and the second catalyst disk 51, and the flushing wastewater is discharged from the backwashing drain pipe 13.

[0060] Working principle: The working principle of the system of the present invention is briefly described below in combination with the method of the present invention.

[0061] When performing step S2, the driving motor 72 is turned on to drive the gear 73 to rotate, thereby driving the first rotating ring 7 to rotate inside the slot 15 under the action of the tooth groove 74, and then driving the connecting rod 71 and the second rotating ring 8 to rotate. At the same time, the second stirring rod 84 and the stirring rotating rod 85 on the second rotating ring 8 rotate and stir the catalyst inside the second catalyst disk 51, thereby increasing the contact time between the catalyst inside the second catalyst disk 51 and the multiphase extract, thereby increasing the solubility of ozone in water, achieving full contact and mixing of gas and water, and improving the catalytic oxidation effect;

[0062] At the same time, the auxiliary connecting rod 81 on the second rotating ring 8 drives the first catalyst disk 41 to rotate under the action of the auxiliary baffle, thereby increasing the contact time between the catalyst inside the first catalyst disk 41 and the multiphase extract, thereby increasing the solubility of ozone in water, achieving full contact and mixing of gas and water, and improving the catalytic oxidation effect;

[0063] At the same time, the special-shaped baffle 83 intermittently squeezes the spring of the spring rod 9 during the rotation process, so that the spring rod 9 drives the third catalyst disk 92 to intermittently push out and retract reciprocating motion, thereby increasing the contact time between the catalyst inside the third catalyst disk 92 and the multiphase extract, thereby increasing the solubility of ozone in water, achieving full contact and mixing of gas and water, and improving the catalytic oxidation effect;

[0064] At the same time, the first stirring rod 93 drives the stirring fixed rod 42 to perform intermittent pushing and retracting reciprocating motion, so that the catalyst inside the rotating first catalyst disk 41 is further stirred, thereby improving the solubility of ozone in water, achieving full contact and mixing of gas and water, and improving the catalytic oxidation effect;

[0065] When performing step S4, the second catalyst disc 51 needs to be lowered. At this time, the special-shaped baffle 83 of the second rotating ring 8 is first adjusted to a suitable position so that the spring rod 9 is no longer blocked by the protrusion of the special-shaped baffle 83. Then, the push rod motor 6 is turned on to drive the first telescopic rod 61 to descend and lower the second catalyst disc 51 to a specified position and make it flush with the first catalyst disc 41. At this time, the microporous diffuser 14 is turned on to inject high-pressure water for backwashing. At the same time, the drive motor 72 is turned on again to make it work in the same way as above, so that the third catalyst disc 92 reciprocates in the slot 52 to improve the flushing efficiency. The three catalyst discs can all obtain a good flushing effect, and the flushing wastewater is discharged from the backwash drain pipe 13.

[0066] Experimental example

[0067] The field simulation experiment was carried out using the experimental method in Example 4, and multiple groups were carried out, and the results are as follows:

[0068] Group 1: ozone dosage was 200 mg / (L*h), temperature was 25°C, hydraulic retention time was 1h, ozone concentration was 16.66 mg / L, intermittent reaction, 30% catalyst was added, COD concentration was reduced from 238 mg / L to 130 mg / L, COD removal rate was 45.3%, which was 15% higher than that of ordinary ozone reaction tower;

[0069] Group 2: ozone dosage was 400mg / (L*h), temperature was 25℃, hydraulic retention time was 1h, ozone concentration was 22.5mg / L, intermittent reaction, 30% catalyst was added, COD concentration was reduced from 238mg / L to 96mg / L, COD removal rate was 57.7%, which was 19.5% higher than that of ordinary ozone reaction tower;

[0070] The third group: the ozone dosage was 200 mg / (L*h), the temperature was 25°C, the hydraulic retention time was 1h, the ozone concentration was 16.66 mg / L, continuous flow reaction, 30% ozone catalyst was added, the COD concentration was reduced from 200 mg / L to 102 mg / L, and the COD removal rate was 49.5%, which was 10% higher than that of the ordinary ozone reaction tower.

Claims

1. An ozone catalytic oxidation system for multiphase extract treatment, characterized in that: It comprises an outer reaction cylinder (1) and an inner reaction cylinder (2), wherein the inner reaction cylinder (2) is located at the inner center of the outer reaction cylinder (1); The top of the outer reaction tube (1) is provided with a top cover (11), the center of the top of the inner reaction tube (2) is provided with a water inlet joint (21), the water inlet joint (21) is fixedly connected to the bottom of the top cover (11), a main water inlet pipe (3) is provided on one side of the water inlet joint (21), an inner water inlet pipe (22) is provided in the middle of the inner reaction tube (2), the inner water inlet pipe (22) is connected to the main water inlet pipe (3), the bottom of the inner water inlet pipe (22) passes through the inner reaction tube (2) and then extends to the bottom of the outer reaction tube (1), the outer periphery of the bottom and the middle of the inner reaction tube (2) is respectively sleeved with a first catalytic component (4) and a second catalytic component (5), a reflux window (23) is provided on both sides of the top of the inner reaction tube (2), and the inner reaction tube (2) is symmetrical inside. Two lifting pipes (24) are provided, the top of the lifting pipe (24) passes through the top of the inner reaction tube (2) and is connected to the air pipe (16) located above the top cover (11), a return pipe (25) is provided on one side of the top of each of the two lifting pipes (24), the return pipe (25) passes through the water inlet joint (21) and is connected to the inner water inlet pipe (22), a main drainage pipe (12) and a backwash drainage pipe (13) are provided on the top of the side wall of the outer reaction tube (1), a microporous diffuser (14) is provided at the inner bottom of the outer reaction tube (1) and corresponding to the inner water inlet pipe (22), and a plurality of microporous diffusers (14) are provided circumferentially at the inner bottom of the outer reaction tube (1) and corresponding to the first catalytic component (4) and the second catalytic component (5); The first catalytic component (4) comprises a first catalyst disc (41), the first catalyst disc (41) is rotatably connected to the inner reaction tube (2), the second catalytic component (5) comprises a second catalyst disc (51), the second catalyst disc (51) is slidably connected to the inner wall of the outer reaction tube (1) up and down, and the first catalyst disc (41) and the second catalyst disc (51) are both filled with catalyst; The catalyst is a copper-cerium bimetallic ceramsite catalyst, the ratio of the diameter of the riser (24) to the diameter of the air pipe (16) is 5:3, the ratio of the distance between the first catalytic component (4) and the second catalytic component (5) to the height of the outer reaction tube (1) is 1:6, the ratio of the diameter to the height of the outer reaction tube (1) is 1:6, and the ratio of the diameter of the inner reaction tube (2) to the diameter of the outer reaction tube (1) is 1:3; A first rotating ring (7) is provided at the center of the top cover (11) in a sliding seal. Two connecting rods (71) are symmetrically provided at the bottom of the first rotating ring (7). The connecting rods (71) are located on both sides of the inner reaction cylinder (2) and are close to the outer wall of the inner reaction cylinder (2). A second rotating ring (8) is sleeved on the outer wall of the middle part of the inner reaction cylinder (2). A plurality of auxiliary connecting rods (81) are provided at equal intervals in the circumferential direction at the bottom of the second rotating ring (8). Each auxiliary connecting rod (81) is provided with an auxiliary baffle (82) near its bottom. The auxiliary baffle (82) is connected to the inner reaction cylinder (2). The bottom of the first catalyst disk (41) is fixedly connected, the bottom of the auxiliary connecting rod (81) is provided with a special-shaped baffle (83), the special-shaped baffle (83) is provided with a protrusion at the position corresponding to each auxiliary connecting rod (81), the bottom of the inner reaction tube (2) is provided with spring rods (9) of the same number as the auxiliary connecting rods (81) at equal intervals in the circumferential direction, the middle of the spring rod (9) is connected to the outer wall of the inner reaction tube (2) through a spring (91), the top of the spring rod (9) is aligned with the outer edge of the special-shaped baffle (83), and the outer side of the top of the spring rod (9) is provided with a third catalyst disk (92); The first catalyst plate (41) and the second catalyst plate (51) are mesh structures with an open top, the third catalyst plate (92) is an integral mesh structure, a first stirring rod (93) is provided at the end of the third catalyst plate (92), the end of the first stirring rod (93) extends into the interior of the first catalyst plate (41), and a stirring fixing rod (42) is provided at the end of the first stirring rod (93); The top surface of the second rotating ring (8) is symmetrically provided with two second stirring rods (84), the ends of the second stirring rods (84) are rotatably connected with stirring rotating rods (85), and the stirring rotating rods (85) extend into the interior of the second catalyst disk (51). The bottom surface of the top cover (11) is provided with a push rod motor (6), and the output end of the push rod motor (6) is connected to the first telescopic rod (61), and the bottom of the first telescopic rod (61) is connected to the inner bottom of the second catalyst disk (51). The bottom surface of the top rod on the side symmetrical to the first telescopic rod (61) is provided with a second telescopic rod (62) for maintaining the stability of the second catalyst disk (51), and the bottom of the second telescopic rod (62) is connected to the inner bottom of the second catalyst disk (51). The inner side wall of the second catalyst disk (51) is provided with a plurality of slots (52), and when the second catalyst disk (51) slides down to the bottom of the outer reaction tube (1), the slots (52) and the third catalyst disk (92) are connected to each other.

2. The ozone catalytic oxidation system for multiphase extract treatment according to claim 1, characterized in that: The first rotating ring (7) is engaged and rotatably connected with a slot (15) provided inside the top cover (11); a driving motor (72) for driving the first rotating ring (7) to rotate is provided on one side of the top cover (11); a gear (73) is provided at the output end of the driving motor (72); the gear (73) is meshed and connected with a tooth groove (74) provided on the upper surface of the first rotating ring (7); and there are four auxiliary connecting rods (81).

3. The ozone catalytic oxidation system for multiphase extract treatment according to claim 1, characterized in that: A sliding block (53) is provided on each side of the outer wall of the second catalyst disk (51), and the sliding block (53) is slidably connected to a sliding groove (17) provided on the inner wall of the outer reaction cylinder (1).

4. The ozone catalytic oxidation system for multiphase extract treatment according to claim 1, characterized in that: A two-way air-permeable valve (18) is provided on one side of the top of the top cover (11), and a one-way valve (26) is provided in the middle of the inner water inlet pipe (22).

5. An ozone catalytic oxidation process for treating a multiphase extract according to an ozone catalytic oxidation system for treating a multiphase extract according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, liquid inlet: the multiphase extract to be treated is injected from the main water inlet pipe (3), and then enters the inner water inlet pipe (22), and the microporous diffuser (14) corresponding to the inner water inlet pipe (22) is opened to inject ozone into the inner water inlet pipe (22), so that the multiphase extract and the ozone are initially in countercurrent contact; S2, turbulent catalysis: the multiphase extract flows out from the bottom of the inner water inlet pipe (22) and enters the outer reaction tube (1), the microporous diffusers (14) corresponding to the first catalytic component (4) and the second catalytic component (5) are opened to inject ozone into the outer reaction tube (1), so that the multiphase extract forms a turbulent state with the ozone during the rising process, and then the multiphase extract flows through the first catalyst disk (41) and the second catalyst disk (51) in sequence, and the catalysts inside the first catalyst disk (41) and the second catalyst disk (51) catalytically oxidize the multiphase extract; S3, reflux: when the multiphase extract flows through the upper part of the outer reaction tube (1), a part of the multiphase extract flows back to the inner reaction tube (2) through the reflux window (23), the air pump connected to the air pipe (16) is turned on to generate negative pressure in the air pipe (16) under the action of aeration, and the multiphase extract in the inner reaction tube (2) enters the riser, and then enters the inner water inlet pipe (22) through the reflux pipe (25) at the top of the riser, thereby repeating the above steps S1 to S2, and the rest of the multiphase extract is discharged from the main drainage pipe (12); S4, backwashing: all microporous diffusers (14) are opened to inject water for flushing, and the catalyst inside the first catalyst disk (41) and the second catalyst disk (51) is flushed, and the flushing waste water is discharged from the backwashing drain pipe (13).

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