Tubular multi-element advanced oxidation sewage treatment device and method based on ultraviolet ozone

Abstract

The invention discloses a tubular multi-element advanced oxidation sewage treatment device and a tubular multi-element advanced oxidation sewage treatment method based on ultraviolet ozone, which realize deep oxygenolysis of refractory organics in sewage by integrating ultraviolet ozone, persulfate addition, UV / O3 / TiO2 and ozone carbon-based catalytic oxidation and other advanced oxidation technologies. According to the integrated technical scheme, the treatment efficiency can be improved, the energy consumption is reduced, the use of chemical agents is reduced, and meanwhile, the risk of secondary pollution is reduced. Besides, the technical scheme provided by the invention also has the advantages of simplicity and convenience in operation, stable treatment effect, wide application range and the like, can adapt to sewage of different types and concentrations, and particularly shows remarkable technical advantages in the aspect of treating high-concentration and refractory industrial wastewater.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage deep treatment, and in particular relates to a tubular multi-element advanced oxidation sewage treatment device and method based on ultraviolet ozone. Background Art

[0002] Nowadays, traditional biological treatment technology can no longer fully meet the increasingly stringent water quality discharge standards. Especially in key river basins and regions, more efficient deep treatment technologies are needed to further reduce the concentration of pollutants such as COD, nitrogen, and phosphorus in the effluent.

[0003] Advanced oxidation technology has attracted widespread attention due to its strong oxidizing ability, mild reaction conditions, fast reaction rate and good treatment effect. Ozone, as a strong oxidant, can effectively oxidize a variety of difficult-to-degrade organic substances, such as phenols, benzene rings, cyanides, sulfides, organic nitrogen compounds, etc. However, the solubility of ozone in water is low, and the ozone generation efficiency is low and the energy consumption is high. How to improve the solubility of ozone in water, improve the utilization rate of ozone and reduce energy consumption are the main problems faced by current ozone generators. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a tubular multi-element advanced oxidation sewage treatment device and method based on ultraviolet ozone, so as to further improve the oxidation efficiency of ozone and the sewage treatment effect, especially to improve the treatment effect of organic pollutants that are difficult to effectively remove by traditional biological treatment methods.

[0005] The present invention combines an ozone supply system, an ozone microbubble aeration system, a persulfate dosing system, an ultraviolet light system, a titanium-based catalytic system, and a carbon-based catalytic system to form multiple advanced oxidation zones (including UV / O3 / PS advanced oxidation zones, UV / O3 / TiO2 advanced oxidation zones, ozone carbon-based catalytic oxidation zones, water-gas separation zones, etc.), thereby achieving deep treatment of refractory organic matter in sewage. This integrated treatment device and method is intended to further remove residual refractory organic matter through physical and chemical methods, improve the removal effect of pollutants, and meet the needs of upgrading and transformation of sewage treatment plants.

[0006] To achieve the above purpose, the specific technical solutions adopted by the present invention are as follows:

[0007] A tubular multi-element advanced oxidation sewage treatment device based on ultraviolet ozone comprises a reaction tank, wherein an ozone microbubble aeration system and a persulfate dosing system are arranged at the bottom of the reaction tank, an ultraviolet light system and a titanium-based catalytic system are arranged in the middle, and a carbon-based catalytic system is arranged at the top; the sewage inlet of the reaction tank is located above the ozone microbubble aeration system and below the ultraviolet light system;

[0008] The ozone microbubble aeration system mixes ozone with sewage through aeration, and the persulfate addition system adds persulfate (PS) to the mixed system, and under the action of ultraviolet light of the ultraviolet light system, a UV / O3 / PS advanced oxidation zone is formed between the ozone microbubble aeration system and the ultraviolet light system;

[0009] The ultraviolet light system and the titanium-based catalytic system are arranged crosswise, and the ultraviolet light interacts with the titanium-based material to form a UV / O3 / TiO2 advanced oxidation zone in the arrangement area;

[0010] The arrangement area of ​​the carbon-based catalytic system forms an ozone carbon-based catalytic oxidation zone.

[0011] In one embodiment, the top of the reaction tank is located above the carbon-based catalytic system, and is provided with a demisting layer, a gas-liquid separator, a water outlet pipe and a gas outlet to form a water-gas separation zone; the water outlet pipe branches out into a branch connected to a reflux pipe with a flow meter, the reflux pipe is connected to the sewage inlet pipe, and a water inlet pump is provided on the water inlet pipe.

[0012] In one embodiment, the ozone microbubble aeration system includes an aeration pipe and a plurality of aeration plates, wherein the aeration plates are located below the sewage inlet and are densely covered with upward aeration holes; the persulfate dosing system includes a chemical water inlet pipe, and the outlet of the chemical water inlet pipe is located at the sewage inlet.

[0013] In one embodiment, the ultraviolet light system includes an ultraviolet lamp and an ultraviolet lamp sleeve, the ultraviolet lamp is installed in the ultraviolet lamp sleeve, and there are multiple ultraviolet lamps arranged in layers; the titanium-based catalytic system includes a plurality of baffle titanium plates, the baffle titanium plates are arranged at an angle, the lower end of each baffle titanium plate is installed on the inner wall of the reaction tank, and the higher end is suspended to form an upward baffle path, and ultraviolet lamps are arranged between the upper and lower adjacent baffle titanium plates.

[0014] In one embodiment, the material of the baffle titanium plate is a titanium alloy Ni-TiO2 coupled with nickel metal, which can be prepared by the following method:

[0015] The TiO2 plate is plated with a chemical nickel plating solution, and then cleaned, dried, and calcined to form a Ni-TiO2 baffle.

[0016] In one embodiment, the wavelength of the ultraviolet light is 254 nm, which triggers O3 and PS to produce hydroxyl radicals (·OH) and sulfate radicals (·SO4 - ) including multiple reinforcing factors.

[0017] In one embodiment, the carbon-based catalytic system includes an activated carbon layer, which is spread over the cross section of the reaction tank. The activated carbon layer is a granular catalyst mainly composed of activated carbon and loaded with nickel metal, which can be prepared by the following method:

[0018] The activated carbon is immersed in a nickel plating solution for plating, and then dried, and then heat-treated at 500-600° C. to load nickel metal on the activated carbon to form Ni-AC.

[0019] The present invention also provides a tubular multi-element advanced oxidation sewage treatment method based on ultraviolet ozone, which is implemented using the above-mentioned device and includes the following steps:

[0020] Feeding sewage into the reaction tank;

[0021] Start the ozone micro-bubble aeration system to fully mix the ozone and sewage through aeration, and simultaneously add persulfate into the reaction tank;

[0022] Start the UV light system and use the initiation effect of UV light to make ozone and persulfate produce hydroxyl radicals (·OH) and sulfate radicals (·SO4 - ), oxidizing the refractory organic matter in sewage;

[0023] The sewage from the UV / O3 / PS advanced oxidation zone continues to flow upward and enters the UV / O3 / TiO2 advanced oxidation zone. The titanium-based catalytic material is activated under ultraviolet light, generating electron-hole pairs that reduce ozone to generate hydroxyl radicals, which oxidize the difficult-to-degrade organic matter in the sewage again.

[0024] The sewage continues to flow upward after passing through the UV / O3 / TiO2 advanced oxidation zone and enters the ozone carbon-based catalytic oxidation zone. Through the carbon-based adsorption and catalytic properties, it further adsorbs and catalytically degrades organic matter in the sewage, and adsorbs and aggregates the residual ozone in the sewage and exhaust gas.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention integrates a variety of advanced oxidation technologies, and provides a more efficient and comprehensive sewage deep treatment solution compared to the traditional single advanced oxidation technology. Specifically, the present invention achieves deep oxidation and decomposition of difficult-to-degrade organic matter in sewage by combining multiple advanced oxidation technologies such as ultraviolet ozone, persulfate addition, UV / O3 / TiO2 and ozone carbon-based catalytic oxidation. This integrated technical solution can improve treatment efficiency, reduce energy consumption, reduce the use of chemical agents, and reduce the risk of secondary pollution. In addition, the technical solution of the present invention also has the advantages of simple operation, stable treatment effect, and a wide range of applications. It can adapt to sewage of different types and concentrations, especially in the treatment of high-concentration, difficult-to-degrade industrial wastewater. It shows significant technical advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram (front view) of the present invention.

[0028] Figure 2 It is a structural schematic diagram of the present invention (left view).

[0029] Figure 3 It is a schematic diagram of the structure of the present invention (top view).

[0030] Figure 4 It is a schematic diagram of a device with dimension parameters adopted in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below with reference to the accompanying drawings and examples.

[0032] Deep treatment, also known as advanced treatment or tertiary treatment, refers to the further treatment of sewage through physical, chemical and biological methods on the basis of secondary treatment, so as to effectively remove impurities of various properties in sewage and meet higher water quality requirements. Advanced oxidation technology is a technology in deep treatment. At present, the main method of urban sewage treatment is biochemical method. Advanced oxidation technology is mainly used for deep treatment of effluent from biochemical secondary sedimentation tank, tail water and sewage with high water quality standards.

[0033] In order to further improve the ozone utilization efficiency and thus improve the sewage deep treatment effect, the present invention provides an integrated sewage treatment device, namely Figure 1 , Figure 2 and Figure 3 The tubular multi-element advanced oxidation wastewater treatment device based on ultraviolet ozone is shown.

[0034] The main body of the device of the present invention is a reaction tank, which adopts a water flow path of bottom-in and top-out. The volume and shape of the reaction tank can be adjusted according to the treatment volume and treatment effect. Generally, its height dimension is larger than the length and width of the cross section so that the sewage can have a longer travel in the tank.

[0035] The integration of the present invention refers to integrating an ozone microbubble aeration system, a persulfate dosing system, an ultraviolet light system, a titanium-based catalytic system and a carbon-based catalytic system in a reaction tank, wherein the sewage inlet 6 of the reaction tank is located above the ozone microbubble aeration system and below the ultraviolet light system.

[0036] Specifically, the ozone microbubble aeration system and the persulfate dosing system are arranged at the bottom of the reaction tank, the ozone microbubble aeration system mixes ozone with sewage through aeration, and the persulfate dosing system adds persulfate (PS) to the mixed system. Thus, under the action of ultraviolet light from the ultraviolet light system, a UV / O3 / PS advanced oxidation zone can be formed between the ozone microbubble aeration system and the ultraviolet light system.

[0037] The ultraviolet light system and the titanium-based catalytic system are arranged in the middle of the reaction tank, and the two are preferably arranged crosswise so that the ultraviolet light interacts with the titanium-based material to form a UV / O3 / TiO2 advanced oxidation zone in the arrangement area.

[0038] The carbon-based catalytic system is arranged at the upper part of the reaction tank, and an ozone carbon-based catalytic oxidation zone is formed in the arrangement area thereof.

[0039] Thus, the present invention forms three main oxidation zones, and their working principles are described as follows:

[0040] The UV / O3 / PS advanced oxidation zone uses the synergistic effect of UV light, ozone (O3) and persulfate (PS) to produce strong oxidizing free radicals, mainly including hydroxyl radicals (·OH) and sulfate radicals (SO4 - ·). These free radicals have high redox potentials and can non-selectively oxidize and degrade refractory organic matter in water. On the one hand, under the catalysis of UV light, O3 can produce ·OH with high redox potential and non-selectivity through a chain reaction. On the other hand, persulfate can also produce ·OH and SO4 under the action of UV light. - ·, of which SO4 - It has a high redox potential and a long half-life, and is adaptable to a wide pH range. Therefore, the degradation and mineralization efficiency of organic matter can be significantly improved by coupling the advanced oxidation technology of UV / O3 / persulfate (PS), especially for the treatment of refractory wastewater.

[0041] The UV / O3 / TiO2 advanced oxidation zone works by combining the synergistic effects of UV, O3 and TiO2 photocatalysts to produce highly oxidizing ·OH. UV irradiates the TiO2 photocatalyst, exciting TiO2 to produce electron-hole pairs, and the electrons react with dissolved oxygen in the water to generate superoxide radicals (·O2 - ), while holes oxidize water molecules to produce ·OH. At the same time, O3 decomposes to produce ·OH under the action of UV, further enhancing the oxidation capacity. These highly active free radicals can attack and degrade organic pollutants in the water indiscriminately until they are mineralized into carbon dioxide and water. This process can not only effectively remove organic matter, but also kill microorganisms and viruses in the water, achieving deep purification of water quality.

[0042] The ozone carbon-based catalytic oxidation zone works by combining the strong oxidizing properties of O3 with the adsorption and catalytic properties of activated carbon. The highly reactive free radical intermediates, especially OH, produced on the surface of activated carbon are used to oxidize and remove the difficult-to-biodegrade organic matter in the sewage. Activated carbon not only adsorbs organic pollutants in the water, but also catalytically activates O3 molecules, promotes the decomposition of O3 and improves the oxidation efficiency of ozone. The O3-activated carbon combined process can further enhance the removal effect of organic matter and the utilization efficiency of O3. The oxidation and adsorption can simultaneously reduce COD and ammonia nitrogen, and achieve decolorization and denitrification.

[0043] Combined with the above principle description, it is obvious that the device of the present invention generates high-concentration ozone through the ozone supply system, uses the ozone microbubble aeration system to improve the solubility of ozone in water, and combines the persulfate addition system to enhance the generation of free radicals. The advanced oxidation zones work synergistically to produce strong oxidizing free radicals and efficiently degrade difficult-to-degrade organic matter. Finally, the water-gas separation zone is used to achieve effective separation of clean water and gas, thereby achieving the purpose of deep purification of sewage and meeting strict water quality discharge standards.

[0044] In a further embodiment of the present invention, the device is also provided with a water-gas separation zone. Specifically, the water-gas separation zone is at the top of the reaction tank and is located above the carbon-based catalytic system. It is mainly formed by a demisting layer 12, a gas-liquid separator 13, a water outlet pipe 15 and an air outlet 20. In the water-gas separation zone, the demisting layer 12 removes the droplets entrained in the airflow through a physical mechanism to achieve effective separation of gas and liquid. When the gas containing droplets flows through the demisting layer 12, the inertial force of the gas causes the droplets to collide with the surface of the demisting layer 12. The droplets are captured during the collision and gradually aggregate into larger droplets. As the droplets grow larger, when their gravity exceeds the rising force of the gas, these droplets will separate from the surface of the demisting layer 12 and fall. The demisting layer 12 can significantly reduce the concentration of droplets in the gas. Overall, the water-gas separation zone can further separate the ozone tail gas from the water outlet. After efficient ozone catalytic oxidation, the tail gas is mainly oxygen, and the ozone concentration in the tail gas is <0.5mg / m 3 , can be directly used as oxygen source for aeration of biochemical pool or directly discharged externally without ozone destruction, thus avoiding the use of ozone destroyer unit.

[0045] The UV / O3 / PS advanced oxidation zone, UV / O3 / TiO2 advanced oxidation zone, ozone carbon-based catalytic oxidation zone and water-gas separation zone of the present invention are integrated into the lower, middle and upper regions. The overall reaction tank adopts a vertical tubular steel structure. The bottom of the reaction tank is provided with a slag discharge port 21 for discharging reaction sludge.

[0046] In a further embodiment of the present invention, a reflux branch is separated from the outlet pipe 15, and the branch is connected to the reflux pipe 17, and the reflux pipe 17 is connected to the sewage inlet pipe 1, and a flow meter 16 is provided on the reflux pipe 17, and a water inlet pump 14 is provided on the water inlet pipe 1. The present invention can adjust the treatment effect as needed by controlling the reflux. The sewage circulation process increases the contact opportunities between pollutants and ozone and hydroxyl radicals, and enhances the pollutant removal effect. In addition, the reflux process enhances the turbulence of the system, and the ozone in the effluent can be reused for a second time, thereby increasing the ozone utilization efficiency.

[0047] In a further embodiment of the present invention, a specific structure of an ozone microbubble aeration system mainly includes an aeration pipe 2 and a plurality of aeration plates 3. The aeration plate 3 is located below the sewage inlet 6, and is densely covered with upward aeration holes 4 to aerate the ozone upward and better mix it with the incoming water. The persulfate dosing system includes a reagent water inlet pipe 5, and the outlet of the reagent water inlet pipe 5 is located at the sewage inlet 6, that is, the microbubble ozone aeration and PS dosing points are both located at the bottom of the UV / O3 / PS advanced oxidation zone, and the added persulfate is directly mixed with the incoming water, and aeration can further promote the mixing. In this embodiment, three ozone-resistant aeration plates 3 are selected to be distributed at multiple points in the middle area at the bottom of the reaction tank to improve the aeration effect and mixing effect.

[0048] In a further embodiment of the present invention, the ultraviolet light system mainly includes an ultraviolet lamp 9 and an ultraviolet lamp sleeve 8. The ultraviolet lamp 9 is installed in the ultraviolet lamp sleeve 8. The ultraviolet lamp sleeve 8 is used to protect the ultraviolet lamp 9 and has good light transmittance. When installed, it is fixed on the tank wall 19 on the front and rear sides of the tank body, and a cleaning device can be built in. The upper and lower adjacent ultraviolet lamp sleeves 8 can be supported by ultraviolet lamp support plates 23, and the ultraviolet lamp wires 22 are led out of the tank. There are multiple ultraviolet lamps 9 in the present invention, which are arranged in layers and partitions to achieve the intersection of the ultraviolet light system and the titanium-based catalytic system, so that the sewage can pass through the UV / O3 / TiO2 advanced oxidation zone as evenly as possible. The wavelength of the ultraviolet light emitted by the ultraviolet lamp 9 is preferably 254nm, which can better induce O3 and PS to produce multiple enhancement factors, such as the enhancement factors hydroxyl radicals (·OH) and sulfate radicals (·SO4 - )wait.

[0049] In a further embodiment of the present invention, the titanium-based catalytic system includes a plurality of baffle titanium plates 7, and the baffle titanium plates 7 are tilted. In this embodiment, the tilt angle can be specifically designed to be 98.5°, and the tilt angle here refers to the angle with the horizontal direction. The lower end of each baffle titanium plate 7 is installed on the inner wall of the reaction tank, specifically on the tank wall 18 adjacent to the tank wall 2 19, and the higher end is suspended and installed on the tank wall 18 in the opposite direction, thereby forming an upward baffle path, and the contact time between ozone and sewage is increased by baffle, thereby increasing the ozone oxidation efficiency. In addition, the baffle titanium plate 7 can also serve as a catalyst for ozone oxidation, producing more powerful oxidizing ·OH, and improving the degradation efficiency of pollutants. In order to achieve the aforementioned cross arrangement, the present invention is provided with ultraviolet lamps 9 between the upper and lower adjacent baffle titanium plates 7, and the number of ultraviolet lamps 9 is not limited. The present invention can also equip the baffle titanium plate 7 with a cleaning device to clean its surface after long-term operation.

[0050] The material of the baffle titanium plate 7 of the present invention is a titanium alloy Ni-TiO2 coupled with nickel metal, which can be prepared by the following method:

[0051] A TiO2 plate is pre-treated and activated and then plated with a chemical nickel plating solution. The plate is cleaned, dried and heat-treated (600°C, 1h) to form a baffle titanium plate 7. The material is NiO-TiO2. In this material, NiO and TiO2 can act together as ozone oxidation catalysts.

[0052] In a further embodiment of the present invention, the carbon-based catalytic system includes an activated carbon layer 10, which is directly located on the upper part of the UV / O3 / TiO2 advanced oxidation zone, and plays the role of pollutant adsorption, filtration and catalytic ozone oxidation. The activated carbon layer 10 is spread all over the cross-section of the reaction tank. Specifically, the granular activated carbon can be wrapped in a nylon bag to form an activated carbon nylon bag, and the nylon bag can be spread all over the stainless steel circular filter in the tank body.

[0053] The material of the activated carbon layer 10 is a particle catalyst with carbon as the main body and loaded with nickel metal. For example, the carbon-based main body is activated carbon 11, and the material as a whole can be represented as Ni-AC. Specifically, the activated carbon particles can be immersed in a nickel plating solution for plating, and then the dried material is heat-treated for 4 hours (500-600°C) through a pyrolysis process to complete the nickel metal loading of the activated carbon to form Ni-AC. The carbon-based layer has a strong catalytic effect on ozone, and has pollutant adsorption and ozone catalysis functions, and has a mixing function for water vapor and a foam elimination function for sewage.

[0054] According to the above device, the tubular multi-element advanced oxidation sewage treatment method based on ultraviolet ozone of the present invention comprises the following steps:

[0055] Sewage is fed into the reaction tank through the water inlet pipe 1.

[0056] The ozone microbubble aeration system is started, air is aerated upward through the aeration plate 3, and persulfate is simultaneously added into the reaction tank through the reagent water inlet pipe 5, and the persulfate, ozone and sewage are fully mixed.

[0057] Start the UV system, and in the UV / O3 / PS advanced oxidation zone, use the initiation of UV light to make ozone and persulfate produce hydroxyl radicals OH and sulfate radicals SO4 - Two high oxidation potential free radicals oxidize the difficult-to-degrade organic matter in sewage, improve the biochemical properties of sewage or oxidize and remove organic matter.

[0058] The sewage that has passed through the UV / O3 / PS advanced oxidation zone continues to flow upward and enters the UV / O3 / TiO2 advanced oxidation zone. At this time, the titanium-based catalytic material used in the baffled titanium plate 7 is activated under ultraviolet light, generating electron-hole pairs to reduce ozone to generate hydroxyl radicals OH, which oxidize the difficult-to-degrade organic matter in the sewage again. The baffled titanium plate 7 can significantly increase the contact time between ozone and sewage and the ozone catalytic efficiency.

[0059] The sewage and tail gas that have passed through the UV / O3 / TiO2 advanced oxidation zone continue to move upward and enter the ozone carbon-based catalytic oxidation zone. Through the carbon-based adsorption and catalytic properties, the organic matter in the sewage is further adsorbed and catalytically degraded, and the residual ozone in the sewage and tail gas is adsorbed and concentrated, improving the ozone utilization efficiency and organic matter degradation efficiency. At the same time, the ozone concentration of the effluent and tail gas is simultaneously reduced, saving the tail gas destruction system, simplifying the process flow, reducing the floor space, and achieving the purpose of deep treatment of sewage to meet the discharge standards.

[0060] In a specific embodiment of the present invention, taking the daily sewage treatment capacity of 10,000 tons as an example, the reactor size is as follows: Figure 4 The diameter of the reaction tank is 2.5m, and the width of the plane where the UV lamp is installed is 1.5m. The height of the bottom aeration zone is 0.5m, the height of the UV / O3 / PS advanced oxidation zone is 5.0m, the height of the ozone carbon-based catalytic oxidation zone is 2.0m, and the height of the water-gas separation zone is 1.0m. The total height of the tank is 8.5m, and the water outlet is 7.5m high. In addition, the device is equipped with 16 groups of UV lamps, each with 8 lamps, for a total of 128 lamps.

[0061] Total volume of the reaction tank: 40m 3 About, the hydraulic retention time is 3-5min. Based on the traditional ozone oxidation process, the removal of difficult-to-degrade organic matter by ozone alone is 0.2-0.6g-COD / g-O3, while the tubular multi-element advanced oxidation sewage treatment device based on ultraviolet ozone can remove difficult-to-degrade organic matter by 0.5-1.0g-COD / g-O3. The ozone utilization efficiency is more than 2 times higher than that of the single ozone process, which can significantly reduce the ozone concentration in the outlet gas and liquid.

[0062] In summary, the present invention achieves deep treatment of refractory organic matter in sewage by integrating a variety of advanced oxidation technologies. Ultraviolet light excites ozone to produce hydroxyl radicals, persulfate enhances free radical generation, and TiO2 photocatalyst and activated carbon further improve oxidation efficiency. These synergistic effects significantly improve the degradation efficiency of organic pollutants in sewage, effectively reduce the concentration of pollutants such as COD, nitrogen, and phosphorus in the effluent, and meet more stringent water quality discharge standards. In addition, this technical solution also has the advantages of simple operation, low energy consumption, less use of chemical agents, and stable treatment effect, and is suitable for deep purification treatment of various types of sewage.

Claims

1. A tubular multi-element advanced oxidation sewage treatment device based on ultraviolet ozone, comprising a reaction tank, characterized in that: The bottom of the reaction tank is arranged with an ozone microbubble aeration system and a persulfate dosing system, the middle is arranged with an ultraviolet light system and a titanium-based catalytic system, and the upper part is arranged with a carbon-based catalytic system; the sewage inlet (6) of the reaction tank is located above the ozone microbubble aeration system and below the ultraviolet light system; The ozone microbubble aeration system mixes ozone with sewage through aeration, and the persulfate addition system adds persulfate (PS) to the mixed system, and under the action of ultraviolet light of the ultraviolet light system, a UV / O3 / PS advanced oxidation zone is formed between the ozone microbubble aeration system and the ultraviolet light system; The ultraviolet light system and the titanium-based catalytic system are arranged crosswise, and the ultraviolet light interacts with the titanium-based material to form a UV / O3 / TiO2 advanced oxidation zone in the arrangement area; The arrangement area of ​​the carbon-based catalytic system forms an ozone carbon-based catalytic oxidation zone.

2. The tubular multi-element advanced oxidation sewage treatment device based on ultraviolet ozone according to claim 1 is characterized in that: The top of the reaction tank is located above the carbon-based catalytic system and is provided with a demisting layer (12), a gas-liquid separator (13), a water outlet pipe (15) and a gas outlet (20) to form a water-gas separation zone; the water outlet pipe (15) branches off into a branch connected to a return pipe (17) with a flow meter (16); the return pipe (17) is connected to a sewage inlet pipe (1); and a water inlet pump (14) is provided on the water inlet pipe (1).

3. The tubular multi-element advanced oxidation sewage treatment device based on ultraviolet ozone according to claim 1 or 2, characterized in that: The ozone microbubble aeration system comprises an aeration pipe (2) and a plurality of aeration plates (3), wherein the aeration plates (3) are located below a sewage inlet (6) and are densely covered with aeration holes (4) facing upward; the persulfate dosing system comprises a reagent water inlet pipe (5), wherein the outlet of the reagent water inlet pipe (5) is located at the sewage inlet (6).

4. The tubular multi-element advanced oxidation sewage treatment device based on ultraviolet ozone according to claim 1 or 2, characterized in that: The ultraviolet light system comprises an ultraviolet lamp (9) and an ultraviolet lamp sleeve (8), wherein the ultraviolet lamp (9) is installed in the ultraviolet lamp sleeve (8), and there are a plurality of ultraviolet lamps (9) arranged in layers; the titanium-based catalytic system comprises a plurality of baffle titanium plates (7), wherein the baffle titanium plates (7) are arranged obliquely, wherein the lower end of each baffle titanium plate (7) is installed on the inner wall of the reaction tank, and the higher end is suspended in the air to form an upward baffle path, and ultraviolet lamps (9) are arranged between the upper and lower adjacent baffle titanium plates (7).

5. The tubular multi-element advanced oxidation sewage treatment device based on ultraviolet ozone according to claim 4 is characterized in that: The material of the baffle titanium plate (7) is a titanium alloy Ni-TiO2 coupled with nickel metal.

6. The tubular multi-element advanced oxidation sewage treatment device based on ultraviolet ozone according to claim 5 is characterized in that: The baffle titanium plate (7) is prepared by the following method: The TiO2 plate is plated with a chemical nickel plating solution, then cleaned, dried, and calcined at 600°C to form a Ni-TiO2 baffle.

7. The tubular multi-element advanced oxidation sewage treatment device based on ultraviolet ozone according to claim 1 is characterized in that: The wavelength of the ultraviolet light is 254nm, which triggers O3 and PS to produce hydroxyl radicals (·OH) and sulfate radicals (·SO4 - ) including multiple reinforcing factors.

8. The tubular multi-element advanced oxidation sewage treatment device based on ultraviolet ozone according to claim 1 or 2, characterized in that: The carbon-based catalytic system comprises an activated carbon layer (10), which is spread all over the cross section of the reaction tank and is made of a particle catalyst mainly composed of activated carbon (11) and loaded with nickel metal.

9. The tubular multi-element advanced oxidation sewage treatment device based on ultraviolet ozone according to claim 8 is characterized in that: The activated carbon layer (10) is prepared by the following method: The activated carbon (11) is immersed in a nickel plating solution for plating, and then dried, and then heat-treated at 500-600° C. to load nickel metal on the activated carbon (11) to form Ni-AC.

10. A method for treating wastewater by using a tubular multi-element advanced oxidation method based on ultraviolet ozone, which is implemented by using a tubular multi-element advanced oxidation method for treating wastewater by using an ultraviolet ozone device according to any one of claims 1 to 10, characterized in that: The steps include: Feeding sewage into the reaction tank; Start the ozone micro-bubble aeration system to fully mix the ozone and sewage through aeration, and simultaneously add persulfate into the reaction tank; Start the UV light system and use the initiation effect of UV light to make ozone and persulfate produce hydroxyl radicals (·OH) and sulfate radicals (·SO4 - ), oxidizing the refractory organic matter in sewage; The sewage from the UV / O3 / PS advanced oxidation zone continues to flow upward and enters the UV / O3 / TiO2 advanced oxidation zone. The titanium-based catalytic material is activated under ultraviolet light, generating electron-hole pairs that reduce ozone to generate hydroxyl radicals, which oxidize the difficult-to-degrade organic matter in the sewage again. The sewage continues to flow upward after passing through the UV / O3 / TiO2 advanced oxidation zone and enters the ozone carbon-based catalytic oxidation zone. Through the carbon-based adsorption and catalytic properties, it further adsorbs and catalytically degrades organic matter in the sewage, and adsorbs and aggregates the residual ozone in the sewage and exhaust gas.

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