A multi-stage photocatalytic oxidation-ozone synergistic AOP equipment

Abstract

This disclosure relates to the field of water treatment technology. One embodiment provides a multi-stage photocatalytic oxidation-ozone synergistic AOP equipment, comprising a main body having a pre-treatment chamber and a post-treatment chamber, the pre-treatment chamber having an inlet and the post-treatment chamber having an outlet; a catalytic reaction layer disposed within the main body, separating the pre-treatment chamber and the post-treatment chamber, allowing wastewater to sequentially pass through the pre-treatment chamber, the catalytic reaction layer, and the post-treatment chamber; a nano-titanium dioxide coating disposed on the inner walls of both the pre-treatment chamber and the post-treatment chamber; and a plurality of ultraviolet lamps arranged circumferentially within both the pre-treatment chamber and the post-treatment chamber. This technical solution solves the technical problems of low ozone utilization and insufficient hydroxyl radical concentration in existing UV / O3 oxidation equipment for water treatment.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of water treatment technology, and more specifically, to a multi-stage photocatalytic oxidation-ozone synergistic AOP device. Background Technology

[0002] While existing UV / O3 oxidation equipment has demonstrated some effectiveness in water treatment, its application is limited by low ozone utilization. In actual operation, a large amount of ozone fails to fully participate in the oxidation reaction and instead escapes in gaseous form, resulting in resource waste and potential threats to the surrounding environment and the health of operators, while also increasing the cost and management difficulty of exhaust gas treatment.

[0003] Meanwhile, the equipment generates a low concentration of hydroxyl radicals (·OH), directly resulting in insufficient overall oxidizing power of the system. As a core oxide species, the insufficient concentration of hydroxyl radicals reduces the degradation efficiency of complex organic matter, making it difficult to meet the needs of advanced treatment of highly challenging wastewater. Therefore, technological improvements are urgently needed to enhance equipment performance. Utility Model Content

[0004] To overcome the above-mentioned defects, the embodiments of this disclosure provide a multi-stage photocatalytic oxidation-ozone synergistic AOP equipment, which solves the technical problems of low ozone utilization and insufficient hydroxyl radical concentration when UV / O3 oxidation equipment is used for water treatment in the prior art.

[0005] According to one aspect, at least one embodiment of this disclosure provides a multi-stage photocatalytic oxidation-ozone synergistic AOP device, comprising:

[0006] The main body has a pre-processing chamber and a post-processing chamber, the pre-processing chamber having an inlet and the post-processing chamber having an outlet;

[0007] A catalytic reaction layer is disposed within the main body and separates the pretreatment chamber and the posttreatment chamber, so that wastewater passes sequentially through the pretreatment chamber, the catalytic reaction layer and the posttreatment chamber;

[0008] The nano-titanium dioxide coating is provided on the inner walls of both the pretreatment chamber and the posttreatment chamber.

[0009] The ultraviolet lamps are arranged in a circular pattern in both the pre-processing cavity and the post-processing cavity.

[0010] For example, a multi-stage photocatalytic oxidation-ozone synergistic AOP device provided in at least one embodiment of this disclosure further includes:

[0011] A mixing pipe, one end of which has a wastewater inlet and an ozone dosing port, and the other end is connected to the inlet;

[0012] A water jet injector, which is disposed within the mixing pipe.

[0013] For example, a multi-stage photocatalytic oxidation-ozone synergistic AOP device provided in at least one embodiment of this disclosure further includes:

[0014] A cleaning component is slidably disposed on the ultraviolet lamp tube and is used to clean the ultraviolet lamp tube after sliding.

[0015] For example, at least one embodiment of this disclosure provides a multi-stage photocatalytic oxidation-ozone synergistic AOP device, the main body of which includes:

[0016] The first tube body has one end sealed, and the side of this section has the inlet;

[0017] The third tube, one end of which is sealed, and the side of this section has the outlet;

[0018] The second tube is connected between the first tube and the third tube, and the catalytic reaction layer is square-shaped and is passed through the central axis of the second tube.

[0019] For example, at least one embodiment of this disclosure provides a multi-stage photocatalytic oxidation-ozone synergistic AOP device, wherein the catalytic reaction layer divides the interior of the second tube into a first region located on one side of the axial direction and a second region located on the other side of the axial direction, and further includes a first partition plate and a second partition plate. One end of the first region is separated by the first partition plate, and the other end is connected to the post-processing cavity. One end of the second region is separated by the second partition plate, and the other end is connected to the post-processing cavity.

[0020] For example, at least one embodiment of this disclosure provides a multi-stage photocatalytic oxidation-ozone synergistic AOP device, in which the first partition plate and the second partition plate are both semi-circular and rotatably mounted on the second tube body. One end of the catalytic reaction layer is mounted on the first partition plate and the other end is mounted on the second partition plate, and rotates together with the first partition plate and the second partition plate.

[0021] For example, a multi-stage photocatalytic oxidation-ozone synergistic AOP device provided in at least one embodiment of this disclosure further includes:

[0022] A first extension member is disposed on the first partition plate and extends to the end of the second area connected to the pre-processing cavity;

[0023] The first driving impeller is rotatably mounted on the first extension and is driven to rotate by the flowing liquid.

[0024] A first traveling gear is mounted on the first driving impeller;

[0025] The first gear ring is disposed on the inner wall of the first tube body near the end of the second tube body, and the first traveling gear meshes with the first gear ring.

[0026] For example, a multi-stage photocatalytic oxidation-ozone synergistic AOP device provided in at least one embodiment of this disclosure further includes:

[0027] The second extension is disposed on the second partition plate and extends to the end of the first area connected to the post-processing cavity;

[0028] The second drive impeller is rotatably mounted on the second extension and is driven to rotate by the flowing liquid.

[0029] The second traveling gear is mounted on the second drive impeller;

[0030] The second gear ring is disposed on the inner wall of the third tube near one end of the second tube, and the second traveling gear meshes with the second gear ring.

[0031] For example, at least one embodiment of this disclosure provides a multi-stage photocatalytic oxidation-ozone synergistic AOP device, wherein the first driving impeller and the second driving impeller are a plurality of ones arranged in an arc, each of the first driving impellers is provided with the first traveling gear, and each of the second driving impellers is provided with the second traveling gear.

[0032] For example, at least one embodiment of this disclosure provides a multi-stage photocatalytic oxidation-ozone synergistic AOP device, wherein the bottom of the second tube has an impurity outlet. The beneficial effects of the embodiments of this disclosure are:

[0033] This disclosure integrates multiple oxidation methods, improving overall oxidation efficiency through the synergistic effect of different oxidation mechanisms. Ozone itself has strong oxidizing properties and can react directly with organic matter, but it suffers from high selectivity. The heterogeneous ozone catalyst in the catalytic reaction layer can accelerate ozone decomposition, generating hydroxyl radicals (·OH) with higher redox potential and no selectivity, thereby improving the degradation efficiency of organic matter. The UV-nano TiO2 advanced oxidation technology utilizes ultraviolet light to excite the nano-titanium dioxide coating to generate highly oxidizing free radicals such as ·OH and ·O2. - This further enhances the oxidation capacity. Meanwhile, O3... - UV oxidation technology combines the synergistic effects of ozone and ultraviolet light. UV radiation increases the efficiency of converting O3 into ·OH by 10-100 times, and the H2O2 and ·O produced by the photolysis of O3 are also produced. -Intermediates participate in subsequent reactions, compensating for the limitations of ozone selectivity, thereby achieving efficient degradation of organic matter in wastewater. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of a multi-stage photocatalytic oxidation-ozone synergistic AOP device in one embodiment of this disclosure;

[0036] Figure 2 for Figure 1 A schematic diagram of the main body in the embodiment;

[0037] Figure 3 This is a three-dimensional structural diagram of the first partition plate and the second partition plate in yet another embodiment of this disclosure;

[0038] Figure 4 for Figure 3 A top view of the first partition plate and the second partition plate in the embodiment;

[0039] Figure 5 for Figure 4 Schematic diagram of the AA section structure;

[0040] In the diagram: main body 100, pretreatment chamber 101, inlet 1011, posttreatment chamber 102, outlet 1021, first pipe 110, second pipe 120, first zone 121, second zone 122, impurity outlet 123, third pipe 130, catalytic reaction layer 200, nano titanium dioxide coating 300, ultraviolet lamp tube 400, mixing pipe 500, wastewater inlet 501, ozone dosing port 502, water jet injector 600, cleaning component 700, first partition plate 801, second partition plate 802, first extension 901, first drive impeller 902, first traveling gear 903, first gear ring 904, second extension 1001, second drive impeller 1002, second traveling gear 1003, second gear ring 1004. Detailed Implementation

[0041] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0042] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0043] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0044] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0046] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] In wastewater treatment equipment, AOP refers to Advanced Oxidation Processes, a type of oxidation reaction system centered on hydroxyl radicals (·OH). Hydroxyl radicals have an oxidation potential as high as 2.8V, exhibiting extremely strong oxidizing power, capable of almost instantaneously degrading the vast majority of organic pollutants and pathogenic microorganisms in water, ultimately oxidizing and decomposing them into inorganic substances such as carbon dioxide and water. Common implementation methods include ozone / ultraviolet (O3 / UV) synergistic systems, ozone / hydrogen peroxide (O3 / H2O2) combinations, and photocatalytic AOP. This embodiment designs a novel multi-stage photocatalytic oxidation-ozone synergistic AOP equipment, achieving excellent wastewater treatment results.

[0048] like Figures 1-2 As shown, a multi-stage photocatalytic oxidation-ozone synergistic AOP device according to an embodiment of the present disclosure is illustrated, including a main body 100, the main body 100 having a pretreatment chamber 101 and a posttreatment chamber 102, the pretreatment chamber 101 having an inlet 1011 and the posttreatment chamber 102 having an outlet 1021; a catalytic reaction layer 200 is disposed within the main body 100 and separates the pretreatment chamber 101 and the posttreatment chamber 102, so that wastewater passes sequentially through the pretreatment chamber 101, the catalytic reaction layer 200 and the posttreatment chamber 102; the inner walls of the pretreatment chamber 101 and the posttreatment chamber 102 are both provided with a nano-titanium dioxide coating 300; a plurality of ultraviolet lamps 400 are arranged circumferentially within the pretreatment chamber 101 and the posttreatment chamber 102.

[0049] The main body 100 can be tubular or cylindrical. The pretreatment chamber 101 and the posttreatment chamber 102 are separated by a catalytic reaction layer 200, and their volume ratio can be adjusted according to the properties of the wastewater and treatment requirements. The inlet 1011 is located at the top of the pretreatment chamber 101. The outlet 1021 is located at the bottom of the posttreatment chamber 102 to prevent backflow of treated water. The top and bottom of the main body 100 are equipped with removable end caps for easy installation, maintenance, and replacement of internal components.

[0050] The catalytic reaction layer 200 can be a porous ceramic support supporting a heterogeneous ozone catalyst, such as alumina ceramic supported with transition metals like iron, manganese, and cobalt. The porous ceramic support has abundant pores and a large specific surface area, which is beneficial for the adsorption of ozone and organic matter, as well as for the reaction itself. The thickness of the catalytic reaction layer 200 depends on the diameter of the main body 100. The catalytic reaction layer 200 can be designed as a partition, circular, or annular structure, tightly installed within the main body 100, separating the pretreatment chamber 101 and the posttreatment chamber 102.

[0051] The nano-titanium dioxide coating 300 can be prepared using anatase nano-titanium dioxide particles, with a particle size ensuring high photocatalytic activity. To improve the adhesion between the nano-titanium dioxide coating 300 and the inner wall of the substrate 100, an appropriate amount of binder, such as silica sol, is added to the coating. The nano-titanium dioxide coating 300 is uniformly coated on the inner walls of the pretreatment chamber 101 and the posttreatment chamber 102.

[0052] The ultraviolet lamp 400 is a medium-pressure mercury lamp, which can effectively excite nano-titanium dioxide and ozone to generate free radicals. The number of ultraviolet lamps 400 arranged circumferentially in the pretreatment chamber 101 and posttreatment chamber 102 is determined according to the diameter of the chamber and the requirements for illumination uniformity. The ultraviolet lamps 400 are fixed to the inner wall of the main body 100 by lamp holders. To improve the utilization rate of ultraviolet light, a reflector is set around the lamp holder. The reflector is made of a high-reflectivity metal material, such as aluminum foil, to reflect unabsorbed ultraviolet light back to the reaction area.

[0053] This device integrates multiple oxidation methods, improving overall oxidation efficiency through the synergistic effect of different oxidation mechanisms. Ozone itself has strong oxidizing properties and can react directly with organic matter, but it suffers from high selectivity. The heterogeneous ozone catalyst in the catalytic reaction layer 200 can accelerate ozone decomposition, generating hydroxyl radicals (·OH) with higher redox potential and no selectivity, thus improving the degradation efficiency of organic matter. The UV-nano TiO2 advanced oxidation technology utilizes ultraviolet light to excite the nano-titanium dioxide coating 300 to generate highly oxidizing free radicals such as ·OH and ·O2. - This further enhances the oxidation capacity. Meanwhile, O3... - UV oxidation technology combines the synergistic effects of ozone and ultraviolet light. UV radiation increases the efficiency of converting O3 into ·OH by 10-100 times, and the H2O2 and ·O produced by the photolysis of O3 are also produced. - Intermediates participate in subsequent reactions, compensating for the limitations of ozone selectivity, thereby achieving efficient degradation of organic matter in wastewater.

[0054] The main body 100 is internally divided into a pretreatment chamber 101 and a posttreatment chamber 102, separated by a catalytic reaction layer 200. This allows wastewater to pass through different treatment zones sequentially, extending the reaction time and improving the treatment effect. The inner walls of both the pretreatment chamber 101 and the posttreatment chamber 102 are coated with a nano-titanium dioxide coating 300, increasing the area for photocatalytic reaction and enhancing the generation of free radicals. The circumferentially arranged ultraviolet lamps 400 within the pretreatment chamber 101 and the posttreatment chamber 102 ensure uniform distribution of ultraviolet light within the reaction chamber, fully utilizing UV energy to promote various oxidation reactions and achieve energy saving and consumption reduction.

[0055] During the oxidation reaction, the mixture of wastewater and ozone enters the pretreatment chamber 101 through inlet 1011. Under the action of the nano-titanium dioxide coating 300 and the ultraviolet lamp 400, some organic matter is directly decomposed, while ozone begins to decompose, generating reactive species such as hydroxyl radicals (·OH). The wastewater continues to flow downwards, reaching the catalytic reaction layer 200. The heterogeneous ozone catalyst accelerates ozone decomposition, generating a large number of hydroxyl radicals (·OH), which react with the organic matter in the wastewater, efficiently degrading the organic matter. After treatment in the pretreatment chamber 101 and the catalytic reaction layer 200, the wastewater enters the posttreatment chamber 102. In the posttreatment chamber 102, the nano-titanium dioxide coating 300 and the ultraviolet lamp 400 continue to function, further oxidizing the remaining organic matter and ensuring that the wastewater is fully treated.

[0056] During operation, wastewater quality parameters, such as chemical oxygen demand (COD) and total organic carbon (TOC), as well as operating parameters like ozone concentration and ultraviolet light intensity, are monitored in real time. Data is collected at regular intervals, such as every 5-10 minutes, using online monitoring equipment. If water quality parameters are found to be substandard or operating parameters are found to be abnormal, adjustments are made promptly. For example, if the COD removal rate does not meet expectations, the ozone dosage can be increased appropriately or the power of the 400nm ultraviolet lamp can be adjusted; if the ozone concentration is too high or too low, the output of the ozone generator can be adjusted. Simultaneously, the operating status of the device is observed, noting any abnormal sounds or odors. If any problems are found, the device is immediately shut down for inspection and repair.

[0057] The catalytic reaction layer 200 accelerates ozone decomposition, converting more of it into highly oxidizing free radicals to participate in the reaction. At the same time, the synergistic effect of the nano-titanium dioxide coating 300 and the ultraviolet lamp 400 promotes the photolysis of ozone, reducing the leakage of ozone in gaseous form. Compared with existing equipment, the ozone utilization rate is improved, reducing resource waste and exhaust gas treatment costs.

[0058] The synergistic effect of multiple oxidation methods significantly increases the generation of hydroxyl radicals (·OH), and the concentration of hydroxyl radicals is higher than that of existing equipment, thereby enhancing the overall oxidative capacity of the system and improving the degradation efficiency of complex organic matter.

[0059] Due to its strong oxidizing properties, this device improves the removal rate of recalcitrant organic matter, effectively meeting the needs of advanced treatment of highly challenging wastewater. Simultaneously, the hydraulic retention time is only 4 minutes, significantly shortening the treatment time and reducing equipment investment costs and floor space requirements.

[0060] This device not only performs well in wastewater treatment, but also has good effects in sterilization, disinfection, and odor removal. It can be widely used in industrial wastewater treatment, drinking water purification, and deep treatment of sewage treatment plant effluent, and has high practical value and market prospects.

[0061] In some examples, such as Figure 1 As shown, it also includes a mixing pipe 500. One end of the mixing pipe 500 has a wastewater inlet 501 and an ozone dosing port 502, and the other end is connected to an inlet 1011. A water jet injector 600 is installed inside the mixing pipe 500. The mixing pipe 500 has a circular pipe structure, and its diameter is determined based on the actual water volume to be treated. The wastewater inlet 501 and the ozone dosing port 502 are located at different positions at one end of the mixing pipe 500. The wastewater inlet 501 has a larger diameter, while the ozone dosing port 502 has a relatively smaller diameter to ensure that ozone can be injected into the pipe at a suitable flow rate to mix with the wastewater. The length of the mixing pipe 500 is determined according to the required mixing effect, ensuring that the wastewater and ozone have sufficient mixing time before entering the main body 100. This is for ease of installation and maintenance.

[0062] When ozone and wastewater flow through the water jet injector 600, which utilizes existing technology, the structure mainly consists of three parts: a nozzle, a suction chamber, and a diffuser. Wastewater flows through the nozzle in a high-speed jet, creating negative pressure in the suction chamber, drawing in ozone. The high-speed wastewater jet carries the ozone, initially breaking up and mixing the bubbles. The mixture enters the throat, where intensified turbulence further disperses the bubbles. Inside the diffuser, the flow velocity decreases and the pressure increases, promoting ozone dissolution and ultimately forming a homogeneous mixture that is discharged. For ease of installation and disassembly, the water jet injector 600 can be designed as a detachable, segmented structure, with each segment connected by snap-fit ​​or threaded connections.

[0063] The mixing pipe 500 and water jet injector 600 are designed to enhance the mixing effect of wastewater and ozone. Wastewater enters the mixing pipe 500 from the wastewater inlet 501, while ozone is injected from the ozone dosing port 502. Within the mixing pipe 500, the flow patterns of the wastewater and ozone are altered by the pipe's structure and the action of the water jet injector 600. The twisted blades of the water jet injector 600 cause the fluid to rotate and split, continuously changing the flow direction and speed, increasing the contact area and contact time between the wastewater and ozone, thereby promoting thorough mixing. This thorough mixing allows the ozone to be more evenly dispersed in the wastewater, providing better conditions for the subsequent oxidation reaction within the main body 100, improving ozone utilization efficiency and the effectiveness of the oxidation reaction.

[0064] By thoroughly mixing wastewater and ozone before they enter the main body 100, the preconditions for the multi-stage photocatalytic reaction with ozone within the main body 100 are optimized. The uniformly mixed wastewater and ozone mixture, upon entering the pretreatment chamber 101, can more effectively interact with the nano-titanium dioxide coating 300, the ultraviolet lamp 400, and the catalytic reaction layer 200. For example, uniformly distributed ozone, under ultraviolet light irradiation and nano-titanium dioxide catalysis, can more efficiently generate reactive species such as hydroxyl radicals, which react fully with the organic matter in the wastewater, thereby improving the overall degradation efficiency of organic matter in the device.

[0065] The installation of the mixing pipe 500 and the water jet injector 600 improves the mixing efficiency of wastewater and ozone compared to systems without this structure, enabling uniform mixing of the two in a short time and providing more favorable conditions for subsequent oxidation reactions.

[0066] Because the wastewater and ozone are mixed more evenly, the ozone can participate more fully in the oxidation reaction within the main body 100, and the ozone utilization rate is further improved on the original basis, further reducing ozone waste and exhaust gas treatment costs.

[0067] The optimized mixing process allows the wastewater and ozone mixture entering the main unit 100 to interact more effectively with each reaction component, improving the removal rate of recalcitrant organic matter, enhancing the overall wastewater treatment capacity of the device, and better meeting the needs of advanced treatment of highly challenging wastewater.

[0068] In some examples, such as Figure 1 As shown, the device also includes a cleaning component 700, which is slidably mounted on the UV lamp tube 400 for cleaning the UV lamp tube 400 after sliding. The cleaning component 700 is designed as a sleeve-like structure adapted to the UV lamp tube 400, and is made of a corrosion-resistant and flexible polymer material, such as polyetheretherketone (PEEK), to adapt to the chemical environment within the device and allow for flexible sliding on the UV lamp tube 400. The inner diameter of the cleaning component 700 is slightly larger than the outer diameter of the UV lamp tube 400, ensuring both a tight fit to the lamp tube and smooth sliding. The cleaning component 700 can be designed to connect to an electric push rod for automatic cleaning, or it can be equipped with an operating handle for manual pushing cleaning.

[0069] The cleaning component 700 is designed to slide on the UV lamp 400, providing a convenient way to clean the UV lamp 400. During device operation, impurities from wastewater and reaction-generated deposits may adhere to the surface of the UV lamp 400. These contaminants affect the transmittance of UV light, thereby reducing the efficiency of photocatalysis and oxidation reactions. By incorporating the sliding cleaning component 700, operators can clean the UV lamp 400 directly inside the device without disassembling it, saving cleaning time and maintenance costs.

[0070] Timely and effective cleaning of the UV lamp tube 400 ensures its surface cleanliness and maintains high UV light transmittance. This helps the nano-titanium dioxide coating 300 to more fully absorb UV light, stimulating the generation of more strong oxidizing free radicals, such as ·OH and ·O2. - This enhances the overall oxidation capacity of the device. Simultaneously, the clean UV lamps 400 work synergistically with ozone, promoting ozone decomposition and generating more hydroxyl radicals, further improving the degradation efficiency of organic matter and ensuring the device maintains consistently high operating efficiency.

[0071] The cleaning component 700 makes the cleaning operation of the UV lamp 400 simple and convenient, eliminating the need for a complicated disassembly process. Compared with traditional disassembly and cleaning methods, the maintenance time is shortened, improving the maintainability of the equipment and reducing downtime caused by maintenance.

[0072] Regularly cleaning the UV lamps 400 with the cleaning kit 700 effectively maintains UV light transmittance, making the oxidation capacity of the device more stable. This improves the degradation efficiency of organic matter, ensuring consistently high-efficiency operation and extending the equipment's lifespan.

[0073] In some examples, such as Figure 2 As shown, the main body 100 includes a first tube 110, one end of which is sealed and the side of this section has an inlet 1011; a third tube 130, one end of which is sealed and the side of this section has an outlet 1021; a second tube 120 is connected between the first tube 110 and the third tube 130; and the catalytic reaction layer 200 is square plate-shaped and is passed through by the central axis of the second tube 120.

[0074] The first pipe body 110 is cylindrical in shape, with one end sealed by a cap. The cap is connected to the pipe body via a flange to ensure good sealing performance. The inlet 1011 is located on the side near the sealed end and has a circular opening.

[0075] The second pipe body 120 has the same inner diameter as the first pipe body 110. Both ends of the second pipe body 120 are connected to the first pipe body 110 and the third pipe body 130 respectively via flanges, in a connection method similar to that between the first pipe body 110 and the end cap. The catalytic reaction layer 200 is square-shaped and is traversed by the central axis of the second pipe body 120. To ensure the installation stability of the catalytic reaction layer 200, an annular groove can be provided on the inner wall of the second pipe body 120. The edge of the catalytic reaction layer 200 is embedded in the groove and sealed with sealant to prevent wastewater leakage.

[0076] The inner diameter of the third pipe body 130 is the same as that of the first and second pipe bodies. One end is sealed with a cap, which is connected to the pipe body via a flange. The outlet 1021 is located on the side near the sealed end and is a circular opening. A filter device can be installed at the outlet 1021. The filter device uses a stainless steel filter screen, and the pore size of the filter screen is determined according to the water quality requirements of the treated water. It is used to intercept any residual catalyst particles or other impurities to ensure the quality of the effluent.

[0077] The main body 100 consists of a first pipe 110, a second pipe 120, and a third pipe 130, a design that achieves functional zoning. The first pipe 110 is mainly responsible for the introduction and initial distribution of the wastewater and ozone mixture. The second pipe 120 is responsible for the catalytic reaction, with the catalytic reaction layer 200 positioned at the axial section to ensure that the wastewater can fully contact the catalyst as it flows through, undergoing ozone catalytic oxidation. The third pipe 130 is responsible for the collection and discharge of treated water, and a filtration device at the outlet 1021 ensures the quality of the effluent. This modular design clearly defines the function of each part, facilitating installation, maintenance, and optimization.

[0078] The wastewater and ozone mixture enters through inlet 1011 of the first pipe body 110. After initial distribution within the pipe, it enters the second pipe body 120 to fully react with the catalytic reaction layer 200. The water after the catalytic reaction enters the third pipe body 130, is filtered, and then discharged from outlet 1021. The wastewater flows axially in the first and third pipe bodies 110 and radially in the second pipe body 120. This bend in the flow path, altering the flow path of the wastewater within the device, improves reaction efficiency and treatment effect. Furthermore, the pipe bodies are connected by flanges, facilitating the disassembly and replacement of internal components, such as the catalytic reaction layer 200, which is beneficial for equipment maintenance and upgrades.

[0079] The modular main structure allows for individual disassembly and replacement of each tube section, making maintenance of vulnerable components such as the catalytic reaction layer 200 more convenient and reducing maintenance time compared to a one-piece structure. Furthermore, this structure facilitates upgrades and modifications to the device, such as replacing the catalytic reaction layer 200 with a higher-performance one or optimizing the internal structure of the tubes, thereby improving the device's adaptability and processing capacity.

[0080] In some examples, such as Figures 1-3 As shown, the catalytic reaction layer 200 divides the interior of the second tube 120 into a first region 121 located on one side of the axial direction and a second region 122 located on the other side of the axial direction. It also includes a first partition plate 801 and a second partition plate 802. One end of the first region 121 is separated by the first partition plate 801, and the other end is connected to the post-processing chamber 102. One end of the second region 122 is separated by the second partition plate 802, and the other end is connected to the post-processing chamber 102.

[0081] Both the first partition plate 801 and the second partition plate 802 are made of corrosion-resistant, high-strength plastic materials, such as polytetrafluoroethylene (PTFE), to withstand the chemical environment of wastewater and ozone. Both partition plates are semi-circular in shape and match the cross-sectional shape of the second tube 120.

[0082] The catalytic reaction layer 200, a square plate-shaped structure, is traversed by the central axis of the second tube 120, dividing the interior of the second tube 120 into a first region 121 on one axial side and a second region 122 on the other axial side. The side length of the catalytic reaction layer 200 is determined according to the inner diameter of the second tube 120 to ensure contact with the inner wall of the second tube 120, thus separating the first region 121 from the second region 122 and preventing untreated wastewater from flowing out. The catalytic reaction layer 200 is made of a porous ceramic material loaded with transition metals such as iron, manganese, and cobalt, possessing a rich pore structure and a large specific surface area, which is beneficial for the adsorption of ozone and organic matter and for the reaction to proceed. A first partition plate 801 is installed at the end of the first region 121 away from the catalytic reaction layer 200, and a second partition plate 802 is installed at the end of the second region 122 away from the catalytic reaction layer 200, separating one end of the first region 121 and the second region 122, while the other ends of both are connected to the post-treatment chamber 102.

[0083] By setting a first partition plate 801 and a second partition plate 802, the first zone 121 and the second zone 122 within the second pipe body 120, which are divided by the catalytic reaction layer 200, are further optimized. Wastewater enters the second pipe body 120 axially from the first pipe body 110, and then flows radially to the catalytic reaction layer 200 for catalytic reaction, thus extending the catalytic reaction time on the catalytic reaction layer 200. After the catalytic reaction is completed, the wastewater flows radially to the first zone 121, and then axially to the third pipe body 130 for discharge. This design makes the flow path of wastewater within the second pipe body 120 more rational, increases the contact time and contact area between the wastewater and the catalytic reaction layer 200, and improves the efficiency of the ozone catalytic oxidation reaction.

[0084] The catalytic reaction layer 200 divides the interior of the second tube 120 into sections. Combined with the setting of the first partition plate 801 and the second partition plate 802, the wastewater can come into more full contact with the catalyst when it flows through the catalytic reaction layer 200. The section design helps to optimize the fluid dynamics conditions in the reaction area, making the distribution of ozone and organic matter around the catalytic reaction layer 200 more uniform, further improving the efficiency of the catalytic reaction, thereby enhancing the degradation capacity of the entire device for organic matter.

[0085] In some examples, such as Figures 3-5 As shown, both the first partition plate 801 and the second partition plate 802 are semi-circular and are rotatably mounted on the second tube 120. One end of the catalytic reaction layer 200 is mounted on the first partition plate 801 and the other end is mounted on the second partition plate 802, and rotates together with the first partition plate 801 and the second partition plate 802.

[0086] The first partition plate 801 and the second partition plate 802 are designed to be semi-circular, with radii that match the inner diameter of the second tube 120. A rotating shaft mounting hole is provided on one side of the partition plate.

[0087] The catalytic reaction layer 200 remains square-plate shaped, with its two ends connected to the first partition plate 801 and the second partition plate 802, respectively. Rectangular connecting lugs are provided at both ends of the catalytic reaction layer 200. The two ends of the rotating shaft pass through the rotating shaft mounting holes of the first partition plate 801 and the second partition plate 802, respectively, and are secured with nuts to ensure that the partition plates and the catalytic reaction layer 200 can rotate together around the rotating shaft.

[0088] The first partition plate 801 and the second partition plate 802 are designed to be rotatable, and the catalytic reaction layer 200 rotates with them, allowing the angle of the catalytic reaction layer 200 within the second pipe body 120 to be flexibly adjusted or continuously changed. By rotating the partition plates, the water flow in the first zone 121 and the second zone 122 can be altered, thereby adapting to wastewater treatment needs of different water qualities and quantities.

[0089] During rotation, the position and angle of the catalytic reaction layer 200 change, allowing ozone and organic matter in the wastewater to come into contact with the catalyst at different locations, avoiding the problem of excessive or insufficient local reaction and enhancing the uniformity of the catalytic reaction.

[0090] In some examples, such as Figures 3-5 As shown, it also includes a first extension 901, which is disposed on the first partition plate 801 and extends to the end of the second zone 122 connected to the pretreatment chamber 101. A first drive impeller 902 is rotatably disposed on the first extension 901 and is used to be driven to rotate by the flowing liquid. A first traveling gear 903 is disposed on the first drive impeller 902. A first gear ring 904 is disposed on the inner wall of the first tube 110 near the end of the second tube 120, and the first traveling gear 903 meshes with the first gear ring 904.

[0091] The first extension 901 has a plate-like structure. Its width is determined by the size of the first partition plate 801 and the inner diameter of the second tube 120. Its length extends to the position where the second zone 122 connects to the pre-processing chamber 101. A mounting groove is provided on the side of the first extension 901 near the first drive impeller 902 for mounting the rotating shaft of the first drive impeller 902, ensuring that the first drive impeller 902 is securely mounted and rotates smoothly. The first traveling gear 903 engages with the hub of the first drive impeller 902, and synchronous rotation is achieved through a key connection.

[0092] The inner diameter of the first gear ring 904 is adapted to the inner wall of the first tube 110 near the end of the second tube 120, and is installed on the inner wall of the tube using an interference fit to ensure a secure installation. The outer diameter of the gear ring is determined according to the module and the number of teeth to ensure correct meshing with the first traveling gear 903.

[0093] When the mixture of wastewater and ozone flows from the first pipe 110 to the second pipe 120, some of the water flow impacts the blades of the first drive impeller 902, causing it to rotate. Since the first traveling gear 903 is connected to the first drive impeller 902 via a key, the first traveling gear 903 rotates synchronously with the impeller. The first traveling gear 903 meshes with the first gear ring 904 installed on the inner wall of the first pipe 110, converting the impeller's rotation into circular motion around the first gear ring 904. Because the first extension 901 is connected to the first partition plate 801, the first partition plate 801 rotates with the circular motion of the first traveling gear 903, thereby driving the catalytic reaction layer 200 and the second partition plate 802 to rotate together. In this way, the device can automatically adjust the angles of the first partition plate 801, the second partition plate 802, and the catalytic reaction layer 200 according to the water flow rate and pressure to adapt to different wastewater treatment needs, eliminating the need for manual adjustment.

[0094] The automatic rotation of the partition plate and the catalytic reaction layer 200 is achieved by water flow drive, which can adjust the reaction path of wastewater in the second pipe body 120 and the contact mode with the catalytic reaction layer 200 in real time according to the actual water flow conditions.

[0095] In some examples, such as Figures 3-5 As shown, it also includes a second extension 1001, which is disposed on the second partition plate 802 and extends to the end of the first zone 121 connected to the post-processing chamber 102. The second drive impeller 1002 is rotatably disposed on the second extension 1001 and is driven to rotate by the flowing liquid. The second travel gear 1003 is disposed on the second drive impeller 1002. The second gear ring 1004 is disposed on the inner wall of the third tube 130 near the end of the second tube 120. The second travel gear 1003 meshes with the second gear ring 1004.

[0096] In some examples, such as Figures 3-5 As shown, the second extension 1001 is a strip-shaped structure disposed on the second partition plate 802, extending to the end of the first zone 121 connected to the post-processing chamber 102. A mounting groove is provided on the side near the second drive impeller 1002 to provide a stable and smooth mounting position for the rotation shaft of the second drive impeller 1002.

[0097] The second traveling gear 1003 is connected to the hub of the second drive impeller 1002 via a key, ensuring that the traveling gear and the impeller rotate synchronously. The central mounting hole of the second traveling gear 1003 mates with the hub of the second drive impeller 1002, and synchronous rotation is achieved through key connection.

[0098] The inner diameter of the second gear ring 1004 is adapted to the inner wall of the third tube 130 near the end of the second tube 120, and is installed on the inner wall of the tube using an interference fit. The outer diameter is determined according to the module and the number of teeth to ensure correct meshing with the second traveling gear 1003.

[0099] During operation, the water flowing from the first pipe 110 to the second pipe 120 impacts the first drive impeller 902, causing it to drive the first traveling gear 903 to mesh and rotate with the first gear ring 904. This, in turn, drives the first partition plate 801, the catalytic reaction layer 200, and the second partition plate 802 to rotate. Simultaneously, after the catalytic reaction, the water flowing from the second pipe 120 to the third pipe 130 impacts the second drive impeller 1002, causing the second traveling gear 1003 to mesh and rotate with the second gear ring 1004. This again adjusts the rotation of the second partition plate 802, the catalytic reaction layer 200, and the first partition plate 801, thereby increasing the driving force.

[0100] In some examples, such as Figures 1-2 As shown, the bottom of the second tube 120 has an impurity outlet 123. During the operation of the multi-stage photocatalytic oxidation-ozone synergistic AOP equipment, impurities in the wastewater flow with the water flow within the second tube 120. Since the density of impurities is generally greater than that of water, they gradually deposit towards the bottom of the second tube 120 under the influence of gravity. The impurity outlet 123 is located at the bottom of the second tube 120 and is equipped with a sealing ball valve, which allows for convenient valve opening at appropriate times to discharge the impurities deposited at the bottom. This design effectively prevents impurities from accumulating in the tube for extended periods, preventing impurities from clogging or contaminating the catalytic reaction layer 200 and affecting the normal progress of the catalytic reaction. Timely discharge of impurities helps maintain a good reaction environment within the second tube 120. The accumulation of impurities may alter the flow state of the wastewater within the tube, leading to uneven local flow velocity and distribution, affecting the contact effect between the wastewater and the catalytic reaction layer 200. By regularly discharging impurities, the flow of wastewater within the pipe can be made smoother and more uniform, allowing the ozone catalytic oxidation and photocatalytic reactions to take place in a more stable environment, thereby improving the degradation efficiency of organic matter and the stability of the treatment effect.

[0101] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A multi-stage photocatalytic oxidation-ozone synergistic AOP device, characterized in that, include: The main body (100) has a pre-processing cavity (101) and a post-processing cavity (102), the pre-processing cavity (101) having an inlet (1011) and the post-processing cavity (102) having an outlet (1021). A catalytic reaction layer (200) is disposed within the main body (100) and separates the pretreatment chamber (101) and the posttreatment chamber (102) so that wastewater passes sequentially through the pretreatment chamber (101), the catalytic reaction layer (200) and the posttreatment chamber (102). Nano-titanium dioxide coating (300) is provided on the inner walls of both the pretreatment chamber (101) and the posttreatment chamber (102). The ultraviolet lamp tubes (400) are arranged in a circular pattern in both the pre-processing cavity (101) and the post-processing cavity (102).

2. The multi-stage photocatalytic oxidation-ozone synergistic AOP equipment according to claim 1, characterized in that, Also includes: A mixing pipe (500) has a wastewater inlet (501) and an ozone dosing port (502) at one end, and is connected to the inlet (1011) at the other end; A water jet (600) is disposed within the mixing pipe (500).

3. The multi-stage photocatalytic oxidation-ozone synergistic AOP equipment according to claim 1, characterized in that, Also includes: A cleaning component (700) is slidably disposed on the ultraviolet lamp tube (400) for cleaning the ultraviolet lamp tube (400) after sliding.

4. The multi-stage photocatalytic oxidation-ozone synergistic AOP equipment according to claim 1, characterized in that, The main body (100) includes: The first tube (110) is sealed at one end and has the inlet (1011) on the side of this section. The third tube (130) is sealed at one end and has the outlet (1021) on the side of this section. The second tube (120) is connected between the first tube (110) and the third tube (130), and the catalytic reaction layer (200) is square plate-shaped and is passed through the central axis of the second tube (120).

5. The multi-stage photocatalytic oxidation-ozone synergistic AOP equipment according to claim 4, characterized in that, The catalytic reaction layer (200) divides the interior of the second tube (120) into a first region (121) on one side of the axial direction and a second region (122) on the other side of the axial direction. It also includes a first partition plate (801) and a second partition plate (802). One end of the first region (121) is separated by the first partition plate (801), and the other end is connected to the post-processing chamber (102). One end of the second region (122) is separated by the second partition plate (802), and the other end is connected to the post-processing chamber (102).

6. The multi-stage photocatalytic oxidation-ozone synergistic AOP equipment according to claim 5, characterized in that, Both the first partition plate (801) and the second partition plate (802) are semi-circular and are rotatably mounted on the second tube (120). One end of the catalytic reaction layer (200) is mounted on the first partition plate (801) and the other end is mounted on the second partition plate (802), and rotates together with the first partition plate (801) and the second partition plate (802).

7. The multi-stage photocatalytic oxidation-ozone synergistic AOP equipment according to claim 6, characterized in that, Also includes: The first extension (901) is disposed on the first partition plate (801) and extends to the end of the second area (122) connected to the pretreatment cavity (101); The first drive impeller (902) is rotatably mounted on the first extension (901) and is driven to rotate by the flowing liquid. The first traveling gear (903) is mounted on the first driving impeller (902); The first gear ring (904) is disposed on the inner wall of the first tube body (110) near the end of the second tube body (120), and the first traveling gear (903) meshes with the first gear ring (904).

8. The multi-stage photocatalytic oxidation-ozone synergistic AOP equipment according to claim 7, characterized in that, Also includes: The second extension (1001) is disposed on the second partition plate (802) and extends to the end of the first area (121) connected to the post-processing cavity (102); The second drive impeller (1002) is rotatably mounted on the second extension (1001) and is driven to rotate by the flowing liquid. The second traveling gear (1003) is disposed on the second driving impeller (1002); The second gear ring (1004) is disposed on the inner wall of the third tube (130) near the end of the second tube (120), and the second traveling gear (1003) meshes with the second gear ring (1004).

9. The multi-stage photocatalytic oxidation-ozone synergistic AOP equipment according to claim 8, wherein the first driving impeller (902) and the second driving impeller (1002) are a plurality of ones arranged in an arc, each of the first driving impeller (902) is provided with the first traveling gear (903), and each of the second driving impellers (1002) is provided with the second traveling gear (1003).

10. The multi-stage photocatalytic oxidation-ozone synergistic AOP equipment according to claim 4, characterized in that, The bottom of the second tube (120) has an impurity outlet (123).

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