Photocatalytic ozone catalytic oxidation device

Abstract

The utility model relates to a photocatalytic ozone catalytic oxidation device which comprises a gas dissolver for mixing water and ozone into a mixed solution; the photo-catalytic oxidation reaction unit comprises a plurality of photo-catalytic tubes, the photo-catalytic tubes are used for carrying out turbulent flow on the mixed liquid, and first reaction liquid is formed after photo-catalytic oxidation; and the ozone catalytic oxidation reaction unit is used for performing ozone catalytic oxidation on the first reaction liquid. The photocatalytic tube is arranged, so that the turbulent flow effect on liquid is enhanced, ultraviolet penetration is facilitated, a photocatalyst on each surface of the catalyst sleeve is irradiated by adjacent ultraviolet rays in the photocatalytic oxidation reactor, the utilization area of the photocatalyst is increased, and the ozone utilization rate and the COD removal efficiency are further improved; further, the usage amount of the catalyst in the catalytic ozonation reactor is reduced, and the problem of deposition caused by excessive catalyst is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a photocatalytic ozone catalytic oxidation device. Background Technique

[0002] Reclaimed water reuse separates concentrated and fresh water from sewage, and the fresh water is reused in industrial production, thus saving a large amount of precious water resources, which is of great significance. In the early stage, the traditional sewage treatment system of simple physical and chemical + biochemical methods was used for reclaimed water reuse. The COD concentration of its sewage effluent was relatively high and could not be further reduced, not meeting the water quality requirements of reclaimed water reuse standards or discharge standards. Nowadays, the reclaimed water reuse treatment system is a dual-membrane system composed of ultrafiltration membrane and reverse osmosis membrane. The reverse osmosis membrane has high requirements for indicators such as the salinity of the influent water, the concentration of organic matter, and the pollution index. Therefore, it is necessary to pre-treat the influent water of the reclaimed water reuse system.

[0003] The existing common pre-treatment methods for reclaimed water reuse influent water adopt oxidation methods, such as Fenton method, ozone method, ozone catalytic oxidation method, wet oxidation, etc. Among them, the ozone catalytic oxidation technology has been widely used in the field of refractory organic wastewater due to its obvious reaction effect, easy-to-meet reaction conditions, and no secondary pollution. Due to the higher comprehensive investment and operating costs of the ozone catalytic oxidation system than the traditional process, and the low solubility and utilization rate of ozone in water, the cost performance of this process is low in the field of low-concentration wastewater.

[0004] There are many factors affecting the ozone utilization rate, such as temperature, pH, catalyst type, suspended solids, dosing method, etc. Among them, the ozone dosing method in the ozone catalytic oxidation technology usually adopts the aeration method, the ejector method, etc. The aeration method is the most primitive way of gas-liquid mixing. The ozone gas generated by the ozone generator is introduced into the bottom of the ozone reaction tank through a pipeline by using a titanium aeration disc or an aeration stone. The microbubbles are emitted through the aeration stone and the aeration disc, and the ozone is dissolved in water during the rising process of the bubbles. The efficiency of ozone dosing by the aeration method is generally 20-30%.

[0005] On this basis, in order to further improve the efficiency, the amount of catalyst is increased; with the catalyst, the ozone utilization rate in the initial stage of the ozone catalytic oxidation reactor can reach 70-80%. As the reaction deepens, due to the too thick catalyst layer, the ozone catalyst in the reactor is instead silted up by suspended solids. The suspended solids originate from the reactants generated by the catalytic oxidation reaction, catalyst wear, and raw water. Therefore, it is difficult to overcome and avoid suspended solids. For example, the bulk density of the catalyst reaches 1.8 g / cm after being immersed in water 3, when its thickness exceeds 1 meter, it is very difficult to achieve fluffiness through air backwashing; after the 1-meter-high catalyst is filled with water, it forms a pressure of 70 kPa on the supporting bracket in water, which is already greater than the pressure of the commonly used backwashing fan of 58.8 kPa; therefore, the pressure and air volume of the backwashing fan are not sufficient to loosen all the catalysts, and the backwashing gas can only penetrate from individual positions in the catalyst layer. Due to the impermeability of the catalyst layer, ozone gas also penetrates from individual positions during the operation of the reactor, and ozone cannot flow through the blocked or densely packed places of the catalyst, ultimately leading to the failure of the catalytic oxidation reactor. Further, the incomplete catalytic oxidation reaction results in a reduction in pollutant decomposition, leading to unqualified treated water quality. A large amount of residual ozone is discharged, causing ozone waste and environmental pollution. Summary of the Invention

[0006] Based on this, the purpose of the present invention is to provide a photocatalytic ozone catalytic oxidation device.

[0007] A photocatalytic ozone catalytic oxidation device includes:

[0008] An air dissolver that mixes water and ozone into a mixed solution;

[0009] A photocatalytic oxidation reaction unit, including a plurality of photocatalytic tubes, which turbulently flow and photocatalytically oxidize the mixed solution to form a first reaction solution;

[0010] An ozone catalytic oxidation reaction unit that ozone catalytically oxidizes the first reaction solution.

[0011] Compared with the prior art, the present invention sets a photocatalytic oxidation reaction unit at the front end of the ozone catalytic oxidation reactor. Under the action of ultraviolet light and photocatalyst, water and ozone react to generate highly reactive hydroxyl radicals (·OH) and superoxide ion radicals (O 2- 、O - ), hydroxyl radicals (·OH) and superoxide ion radicals (O 2- 、O - ), which can oxidize various organic substances in advance and improve the ozone utilization rate; by setting photocatalytic tubes, the turbulent flow effect on the liquid is enhanced and it is beneficial for ultraviolet light to penetrate, so that the photocatalysts on all surfaces of the catalyst sleeve are photocatalytically oxidized by the adjacent ultraviolet light in the photocatalytic oxidation reactor, increasing the utilization area of the photocatalyst and further improving the ozone utilization rate and the efficiency of removing COD; furthermore, the amount of catalyst used in the ozone catalytic oxidation reactor is reduced, avoiding the problem of siltation caused by excessive catalyst.

[0012] Furthermore, the photocatalytic tube includes a UV generator, a high-transparency protective sleeve, and a turbulent flow mesh sleeve that are sequentially sleeved from the inside out. The surface of the turbulent flow mesh sleeve is coated with a photocatalyst, and the outer surface of the turbulent flow mesh sleeve has a slope angle.

[0013] Further, the spoiler mesh sleeve is in the shape of a trapezoidal frustum column, the maximum diameter of the cross-section of the frustum is 2 to 3 times the diameter of the high-transparency protective sleeve, and the minimum diameter is 1 to 2 times the diameter of the high-transparency protective sleeve. The height of the spoiler mesh sleeve makes the slope angle of its outer surface satisfy 1° to 3°.

[0014] Further, a number of spoiler mesh sleeves are arranged in parallel in an inverted mode with respect to each other.

[0015] Further, the spoiler mesh sleeve is in the shape of an elliptical column, the maximum diameter of the cross-section of its minor axis is 2 to 3 times the diameter of the high-transparency protective sleeve, and the minimum diameter is 1 to 2 times the diameter of the high-transparency protective sleeve. The height of the spoiler mesh sleeve makes the slope angle of its outer surface satisfy 1° to 3°.

[0016] Further, the spoiler mesh sleeve is in the shape of a spiral column, the maximum diameter of the cross-section in the spiral extension direction is 2 to 3 times the diameter of the high-transparency protective sleeve, and the minimum diameter is 1 to 2 times the diameter of the high-transparency protective sleeve. The height of the spoiler mesh sleeve makes the slope angle of its outer surface satisfy 1° to 3°.

[0017] Further, the spoiler mesh sleeve is made of mesh holes arranged in an array. The mesh holes are regular rhombus holes, square holes or round holes. The side length or diameter of the mesh holes is 8 mm to 20 mm, and the wire diameter of the mesh holes is 2 mm to 5 mm.

[0018] Further, the particle size of the photocatalyst is 200 um to 400 um, and the photocatalyst is one or more of TiO2, ZrO2, ZnO, Cu2O, CdS, WO3, Fe2O3, PbS, SnO2, ZnS, SrTiO3, tungstate.

[0019] Further, the ozone catalytic oxidation reactor includes a backwashing air pipe network, an ozone gas-liquid release device, and an ozone catalyst support layer arranged in sequence from bottom to top. The distance between the ozone gas-liquid release device and the dissolved air pressure regulating valve arranged at the inlet of the ozone catalytic oxidation reactor is less than 1.5 meters.

[0020] Further, the ozone catalyst support layer includes a support bracket and a grille plate. The support bracket is horizontally fixed at the lower part of the ozone catalytic oxidation reactor; the grille plate is arranged on the support bracket, and a steel wire mesh with a wire diameter of 1 mm and a pore size of 10*10 mm and 2 layers of steel with a wire diameter of 0.5 mm and a pore size of 4*4 mm are laid thereon in sequence.

[0021] For better understanding and implementation, the present utility model will be described in detail below with reference to the accompanying drawings. Description of the Drawings

[0022] Figure 1Structural schematic diagram of the present utility model;

[0023] Figure 2 Structural schematic diagram of the high-transparency protective sleeve in an embodiment of the present utility model;

[0024] Figure 3 Structural schematic diagram of the flow-disturbing mesh sleeve in an embodiment of the present utility model;

[0025] Figure 4 Arrangement schematic diagram of the flow-disturbing mesh sleeve in an embodiment of the present utility model;

[0026] Figure 5 Assembly schematic diagram of the photocatalytic tube in an embodiment of the present utility model. Specific implementation manner

[0027] The following will clearly and completely describe the technical solutions of the present utility model in conjunction with the drawings of the embodiments of the present utility model.

[0028] For the ozone catalytic oxidation reactor to maintain a high and stable ozone utilization rate, a certain concentration of available effective catalyst is required. The existing method of increasing the catalyst dosage easily leads to a large amount of catalyst deposition and ineffective ozone catalytic oxidation, while reducing the catalyst dosage reduces the efficiency of the catalytic oxidation system. To solve the problem that increasing the ozone catalyst dosage to improve the ozone catalytic oxidation efficiency in the prior art causes the ozone catalyst to be deposited by suspended substances, resulting in the inability of ozone to flow and the failure of the catalytic oxidation reactor, the present utility model conducts research on photocatalytic ozone catalytic oxidation. Photocatalytic oxidation is that photocatalyst generates electron-hole pairs under the action of light, causing water and ozone to react to generate highly reactive hydroxyl radicals (·OH) and superoxide ion radicals (O 2- 、O - ), and the products after the oxidation of organic substances by hydroxyl radicals (·OH) and superoxide ion radicals (O 2- 、O - ) are separated from the photocatalyst. Under a pressure of 0.2 MPa, the ozone dissolved in water provides more donors for the formation of hydroxyl radicals. With the same amount of photocatalyst, the photocatalytic oxidation with dissolved ozone has a higher ability than the single photocatalytic oxidation, and the COD removal rate is increased by more than 30%. Through research, design, experiment and project verification, the present utility model proposes a photocatalytic ozone catalytic oxidation device. This device combines photocatalytic oxidation and ozone catalytic oxidation. By setting a photocatalytic oxidation reactor with a catalyst sleeve having several trapezoidal frustum-shaped diamond mesh holes, the ozone utilization rate of ozone catalytic oxidation is increased to more than 95%. Without introducing an externally added medicament-type catalyst, the COD concentration of the raw water is reduced without increasing the system salt content, the later maintenance difficulty of the ozone catalytic oxidation reactor is reduced, and the long-term high-efficiency and stable operation of the ozone catalytic oxidation reactor is ensured, thereby solving a series of problems caused by excessive catalyst deposition.

[0029] Please refer to Figure 1 Figure 1 , the photocatalytic ozone catalytic oxidation device proposed by the present utility model comprises: an ozone generation unit 10, a gas-liquid pump 20, a dissolved air vessel 30, a photocatalytic oxidation reaction unit 40 and an ozone catalytic oxidation reactor 50, which are connected in sequence through pipelines.

[0030] The ozone generation unit 10 includes an ozone generator 11, a pressure monitor 12, an ozone flowmeter 13, an ozone regulating valve 14, an ozone concentration detector 15, an ozone water-stop and pressure-stabilizing tank 16, and an ozone dosing regulating valve 17, which are connected to the ozone generator 11 through a conveying pipeline. The ozone gas produced by the ozone generator 11 is monitored for real-time pressure through the pressure monitor 12, real-time flow through the ozone flowmeter 13, concentration through the ozone concentration detector 15, controlled to flow into the ozone water-stop and pressure-stabilizing tank 16 through the ozone regulating valve 14, and controlled to flow out of the ozone water-stop and pressure-stabilizing tank 16 and into the gas-liquid pump 20 through the ozone dosing regulating valve 17. The ozone flow information and ozone concentration information detected by the ozone flowmeter 13 and the ozone concentration detector 15 are fed back to the ozone generator to calculate the ozone output. The preparation pressure of the ozone generator 11 is controlled at 0.1 MPa, and the conveying pipeline is made of 316L stainless steel.

[0031] The gas-liquid pump 20 includes a water inlet end 21, a gas inlet end 22 and a discharge end 23. The water inlet end 21 is connected to the raw water source; the gas inlet end 22 is connected to the ozone dosing valve 17; the discharge end 23 is connected to the dissolved air vessel 30 through a regulating valve, a check valve and a pressure gauge in sequence. The volume of ozone gas in the gas-liquid pump 20 accounts for 7% - 10% of the volume of the influent flow. A raw water flowmeter can be set in front of the water inlet end 21 to collect the raw water flow, and the ozone dosing valve 17 is adjusted to make the gas-liquid volume ratio in the gas-liquid pump 20 meet the above requirements.

[0032] The dissolved air vessel 30 includes a liquid inlet end 31 and a liquid outlet end 32. The liquid inlet end 31 is connected to the discharge end 23 of the gas-liquid pump 20, and raw water and ozone are dissolved in the dissolved air vessel 30; the liquid outlet end 32 is connected to the photocatalytic oxidation reaction unit 40 through a stop valve, and this stop valve is used to cut off the entry of the steam-water mixture into the photocatalytic oxidation reaction unit 40. The volume of the dissolved air vessel 30 is approximately equal to 0.2% - 0.4% of the hourly flow rate of the dissolved air pump, and it can withstand a pressure of more than 0.8 MPa. The dissolved air vessel 30 is generally installed vertically, and the ratio of height to diameter is 5:1; an exhaust valve 33 and a safety valve 34 are installed at its upper end to ensure the pressure-bearing safety of the dissolved air vessel; a float type liquid level gauge 35 is installed at 4 / 5 of its height to limit the highest liquid level of the dissolved air vessel; a drain valve 36 is installed at its bottom for system sewage discharge. The oxidation effect of ozone alone is relatively low, but under pressure, the dissolution of raw water and ozone gas in the dissolved air vessel 30 increases the ozone mixing rate, enabling the organic substances that are easily oxidized to react with ozone first, thereby improving the ozone oxidation effect.

[0033] The photocatalytic oxidation reaction unit 40 includes a housing 41 and a number of photocatalytic tubes 42 arranged inside the housing.

[0034] The housing 41 adopts a bottom-in and top-out type. The mixed liquid flowing out from the liquid outlet end 32 enters the bottom of the housing 41 through a stop valve, flows out from the top of the housing 41 after passing through a number of photocatalytic tubes 42, and enters the ozone catalytic oxidation reactor 50 through a dissolved air pressure regulating valve. A drain valve is also provided at the bottom of the housing 41.

[0035] Please refer to Figures 2 to 5 , the photocatalytic tube 42 is successively sleeved with an ultraviolet generator 421, a high-transparency protective sleeve 422, a flow-disturbing mesh sleeve 423, and a fixer 424 for fixing the high-transparency protective sleeve 422 and the flow-disturbing mesh sleeve 423 from the inside to the outside.

[0036] The wavelength of the ultraviolet rays generated by the ultraviolet generator 421 can be adjusted from 100 nm to 400 nm according to the characteristics of different sewage.

[0037] The high-transparency protective sleeve 422 is sleeved outside the ultraviolet generator 421 to isolate the ultraviolet generator 421 from the mixed liquid, and the ultraviolet generator 421 can move inside the high-transparency protective sleeve 422. The high-transparency protective sleeve 422 is made of quartz material or other materials with high light transmittance and high strength.

[0038] The spoiler mesh sleeve 423 is sleeved outside the highly permeable protective sleeve 422, and the surface of the spoiler mesh sleeve 423 is coated with a photocatalyst. The outer surface of the spoiler mesh sleeve 423 has a slope angle, which is determined according to the viscosity of the mixed liquid. The greater the viscosity, the greater the slope angle. The present invention does not limit the main components of the photocatalyst, and existing photocatalysts such as TiO2, ZrO2, ZnO, Cu2O, CdS, WO3, Fe2O3, PbS, SnO2, ZnS, SrTiO3, tungstates, etc. can all be used.

[0039] Please refer to Figure 3 , in one embodiment, the spoiler mesh sleeve 423 is integrally in the shape of a trapezoidal frustum column, the maximum diameter of the frustum cross-section thereof is 2 to 3 times the diameter of the highly permeable protective sleeve 422, and the minimum diameter is 1 to 2 times the diameter of the highly permeable protective sleeve 422; the height of the spoiler mesh sleeve 423 is such that the slope angle of its outer surface is 1 to 3 degrees. The spoiler mesh sleeve 423 is made of a regular rhombic hole mesh with a side length of 8 mm to 20 mm, and its surface is sprayed with a titanium dioxide TiO2 coating with a particle size of 200 um to 400 um, and is rolled after being sintered and solidified at 1200 °C to 1400 °C, or integrally formed, wherein the wire diameter of the regular rhombic hole is 2 mm to 5 mm. The rhombic mesh frustum column has a spoiler effect on the liquid and is conducive to the penetration of ultraviolet rays, so that the photocatalysts on each surface of the spoiler mesh sleeve 423 are all photocatalytically oxidized by the adjacent ultraviolet rays in the photocatalytic oxidation reactor, thereby making full use of the area of the catalyst.

[0040] Furthermore, the material of the spoiler mesh sleeve 423 is titanium metal.

[0041] Furthermore, please refer to Figure 4 and Figure 5 , the spoiler mesh sleeves 423 of each photocatalytic tube 42 and the spoiler mesh sleeves 423 of the adjacent photocatalytic tubes are assembled in an inverted manner with each other, so that the trapezoidal upper base frustum of the spoiler mesh sleeve 423 of a certain photocatalytic tube 42 is adjacent to the trapezoidal lower base frustum of the spoiler mesh sleeves 423 of other photocatalytic tubes 42 adjacent to it, forming an inverted mode. This inverted mode can save space, shorten the distance between adjacent ultraviolet generators, reduce ultraviolet attenuation, and further improve the photocatalytic efficiency of the initially reacted steam-water mixed liquid connected.

[0042] In another embodiment, the spoiler mesh sleeve 423 is generally in the shape of an elliptical cylinder, and the maximum diameter of the cross-section of its minor axis is 2 to 3 times the diameter of the high-transparency protective sleeve 422, and the minimum diameter is 1 to 2 times the diameter of the high-transparency protective sleeve 422; the height of the spoiler mesh sleeve 423 is such that the slope angle of its outer surface is 1 to 3 degrees. The spoiler mesh sleeve 423 is made of a circular hole mesh with a diameter of 8 mm to 20 mm, and its surface is sprayed with a copper oxide Cu2O coating with a particle size of 200 um to 400 um, and is formed by rolling after sintering and curing at 800 °C to 900 °C, or integrally formed, where the wire diameter of the circular hole is 2 mm to 5 mm.

[0043] In another embodiment, the spoiler mesh sleeve 423 is generally in the shape of a spiral column, and the maximum diameter of the cross-section in the spiral extension direction is 2 to 3 times the diameter of the high-transparency protective sleeve 422, and the minimum diameter is 1 to 2 times the diameter of the high-transparency protective sleeve 422; the height of the spoiler mesh sleeve 423 is such that the slope angle of its outer surface is 1 to 3 degrees. The spoiler mesh sleeve 423 is made of a square hole mesh with a side length of 8 mm to 20 mm, and its surface is sprayed with a tungstate coating with a particle size of 200 um to 400 um, and is formed by rolling after sintering and curing at 1100 °C to 1300 °C, or integrally formed, where the wire diameter of the square hole is 2 mm to 5 mm.

[0044] Only partial implementation forms of the spoiler mesh sleeve 423 are given above. The overall shape, mesh hole shape, and photocatalyst coated on the hole mesh of the spoiler mesh sleeve 423 can be freely combined as needed to prepare a spoiler mesh sleeve with a slope angle on its outer surface.

[0045] The fixer 424 is arranged between the high-transparency protective sleeve 422 and the spoiler mesh sleeve 423, and is used to keep the high-transparency protective sleeve 422 and the spoiler mesh sleeve 423 relatively fixed, so as to achieve the coaxiality of the high-transparency protective sleeve 422 and the spoiler mesh sleeve 423.

[0046] The photocatalytic oxidation reaction unit 40 further includes a chemical cleaning control valve 43, and the cleaning agent enters from the top of the housing 41 through the chemical cleaning control valve 43. During use, the connection paths between the photocatalytic oxidation reaction unit 40 and the dissolved air vessel 30 and the ozone catalytic oxidation reactor 50 are cut off, the drain valve at the bottom of the housing 41 is opened, and after the solution in the housing 41 is emptied, the drain valve at the bottom of the housing 41 is closed, the chemical cleaning control valve 43 is opened, and after the cleaning agent is filled, it is soaked for 0.5 hours to 4 hours, then emptied and rinsed with clean water before being put into use again. After the photocatalytic tube 42 is used for a certain period of time, the heat on the surface of the high-transparency protective sleeve 422 will accelerate the deposition and adhesion of scale substances and organic matters in the sewage, affecting the transparency of the tube; the surface of the spoiler mesh sleeve 423 will also be contaminated, and regular cleaning is required to ensure the efficiency of photocatalytic oxidation.

[0047] The ozone catalytic oxidation reactor 50 includes a cavity 51, in which an anti-washing aeration pipe network 52, an ozone gas-liquid release device 53, and an ozone catalyst support layer 54 are sequentially arranged from bottom to top.

[0048] The bottom of the cavity 51 is provided with a liquid inlet and a drain valve, the upper part is provided with a clear water drain port and a turbid water drain port, and the top is provided with an ozone exhaust port.

[0049] The anti-washing aeration pipe network 52 is fixed at the bottom of the housing 51 and horizontally calibrated. It uses corrosion-resistant pipes, and the materials can be PVDF, ABS, PE, PP, etc. The pipe grid spacing is about 30 cm to 40 cm, the pore diameter is 5 mm, and the hole position is 45° downward. The anti-washing aeration intensity reaches 10 L / m 2 ·s or more. The air source of the anti-washing aeration pipe network 52 comes from an anti-washing roots blower.

[0050] The distance between the ozone gas-liquid release device 53 and the dissolved air pressure regulating valve is less than 1.5 meters, and it is made of 316L stainless steel.

[0051] The ozone catalyst support layer 54 includes a support frame and a grille plate. The support frame is horizontally fixed at the lower part of the cavity 51. The grille plate is arranged on the support frame, and a wire mesh with a wire diameter of 1 mm and a pore diameter of 10*10 mm is laid on it in sequence, and two layers of wire meshes with a wire diameter of 0.5 mm and a pore diameter of 4*4 mm are laid.

[0052] Compared with the prior art, the photocatalytic ozone catalytic oxidation device of the present invention has the following beneficial effects:

[0053] 1) By setting a photocatalytic oxidation reaction unit at the front end of the ozone catalytic oxidation reactor, under the action of ultraviolet light and photocatalyst, water and ozone react to generate highly reactive hydroxyl radicals (·OH) and superoxide ion radicals (O 2- 、O - ), hydroxyl radicals (·OH) and superoxide ion radicals (O 2- 、O - ), which can oxidize various organic substances in advance and improve the ozone utilization rate;

[0054] 2) By setting a catalytic sleeve, the turbulent flow effect of the liquid is enhanced and it is beneficial to the penetration of ultraviolet light, so that the photocatalysts on all surfaces of the catalyst sleeve are irradiated by the adjacent ultraviolet light in the photocatalytic oxidation reactor, improving the utilization area of the photocatalyst, further improving the ozone utilization rate and the efficiency of removing COD; furthermore, the amount of catalyst used in the ozone catalytic oxidation reactor is reduced, and the problem of siltation caused by excessive catalyst is avoided;

[0055] 3) The ozone catalytic oxidation reactor releases gas-liquid through a dissolved air release device, forming ultrafine water foams that disperse around and enter the catalyst layer. The microbubbles are carried by the upward-flowing sewage, which can slow down the bubble aggregation. At the same time, due to the reduction in the amount of catalyst and the good permeability of the catalyst layer, a better dispersed state is obtained before contacting the catalyst, and the steam and water rise evenly. Therefore, the contact area among ozone, sewage, and the catalyst is effectively increased, thus greatly improving the catalytic oxidation effect.

[0056] 4) Due to the high catalytic oxidation efficiency, the consumption of ozone is accelerated, the overflow of residual ozone is reduced, and the waste of ozone is decreased.

[0057] 5) Since the amount of catalyst used is reduced, it is easier to make the catalyst expand when backwashing and maintaining the catalyst, thereby removing the blockage of suspended solids in the interlayer and restoring the system operating conditions. At the same time, it is beneficial to reduce the project investment cost.

[0058] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application. The singular forms "a", "the", and "said" used in the embodiments of the present application and the claims are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that unless otherwise specified, "a plurality" and "several" mean two or more; "and / or" means any or all possible combinations including one or more of the associated listed items; "first", "second", "third", etc. are only used for distinction and not for describing a specific order or sequence, nor can they be understood as indicating or implying relative importance. When the above description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of the present application, for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0059] The above embodiments only represent several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and the present invention also intends to include these changes and modifications.

Claims

1. A photocatalytic ozone oxidation device, characterized in that: include: A dissolver, which mixes water and ozone into a mixed liquid; The photocatalytic oxidation reaction unit comprises a plurality of photocatalytic tubes, wherein the plurality of photocatalytic tubes perform flow disturbance and photocatalytic oxidation on the mixed liquid to form a first reaction liquid; The ozone catalytic oxidation reactor performs ozone catalytic oxidation on the first reaction liquid.

2. The photocatalytic ozone oxidation device according to claim 1 is characterized in that: The photocatalytic tube comprises an ultraviolet generator, a high-transmittance protective sleeve, and a spoiler mesh sleeve which are sequentially covered and sleeved from the inside to the outside. The surface of the spoiler mesh sleeve is coated with a photocatalyst, and the outer surface of the spoiler mesh sleeve has a slope angle.

3. The photocatalytic ozone oxidation device according to claim 2 is characterized in that: The spoiler mesh sleeve is in the shape of a trapezoidal truncated cone column, the maximum diameter of the truncated cone cross section is 2 to 3 times the diameter of the high-transmittance protection sleeve, and the minimum diameter is 1 to 2 times the diameter of the high-transmittance protection sleeve. The height of the spoiler mesh sleeve makes the slope angle of its outer surface meet 1° to 3°.

4. The photocatalytic ozone oxidation device according to claim 3 is characterized in that: If the interference flow mesh sleeves are arranged in parallel in an inverted manner.

5. The photocatalytic ozone oxidation device according to claim 2, characterized in that: The spoiler mesh sleeve is in the shape of an elliptical cylinder, the maximum diameter of its short axis cross section is 2 to 3 times the diameter of the high-transmittance protection sleeve, and the minimum diameter is 1 to 2 times the diameter of the high-transmittance protection sleeve. The height of the spoiler mesh sleeve makes the slope angle of its outer surface meet 1° to 3°.

6. The photocatalytic ozone oxidation device according to claim 2, characterized in that: The spoiler mesh sleeve is in the shape of a spiral column, and the maximum diameter of the cross section in the spiral extension direction is 2 to 3 times the diameter of the high-transmittance protection sleeve, and the minimum diameter is 1 to 2 times the diameter of the high-transmittance protection sleeve. The height of the spoiler mesh sleeve makes the slope angle of its outer surface meet 1° to 3°.

7. The photocatalytic ozone oxidation device according to any one of claims 2 to 6, characterized in that: The spoiler mesh sleeve is made of meshes arranged in an array, the meshes are regular rhombus holes, square holes or circular holes, the side length or diameter of the meshes is 8mm to 20mm, and the wire diameter of the meshes is 2mm to 5mm.

8. The photocatalytic ozone oxidation device according to claim 7, characterized in that: The particle size of the photocatalyst is 200um to 400um.

9. The photocatalytic ozone oxidation device according to any one of claims 1 to 6, characterized in that: The ozone catalytic oxidation reactor comprises a backwash aeration pipe network, an ozone liquid releaser, and an ozone catalyst supporting layer which are arranged in sequence from bottom to top. The distance between the ozone liquid releaser and a dissolved gas pressure regulating valve arranged at a liquid inlet of the ozone catalytic oxidation reactor is less than 1.5 meters.

10. The photocatalytic ozone oxidation device according to claim 9, characterized in that: The ozone catalyst supporting layer includes a supporting frame and a grid plate, wherein the supporting frame is horizontally fixed at the lower part of the ozone catalytic oxidation reactor; the grid plate is arranged on the supporting frame, and a layer of steel wire mesh with a wire diameter of 1 mm and a hole diameter of 10*10 mm and two layers of steel wire mesh with a wire diameter of 0.5 mm and a hole diameter of 4*4 mm are sequentially laid thereon.

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