Photoelectric coupling wastewater treatment device excited by dual-wavelength light and modular system

Abstract

The invention provides a photoelectric coupling wastewater treatment device excited by dual-wavelength light and a modular system. The wastewater treatment device comprises an electrochemical unit, an ultraviolet unit and a power unit. Wherein the electrochemical unit comprises titanium ruthenium anodes and palladium titanium cathodes which are alternately arranged, the electrochemical unit comprises a plurality of circulation holes to form a through flow channel, and the surface of the palladium titanium cathode is subjected to laser cladding treatment to form a porous catalytic structure. The ultraviolet unit comprises a plurality of dual-wavelength ultraviolet lamp tubes and an irradiation pipeline covering the outer sides of the dual-wavelength ultraviolet lamp tubes, the emission wavelengths of the dual-wavelength ultraviolet lamp tubes comprise 254nm and 184nm, an annular flow channel is formed between the irradiation pipeline and the dual-wavelength ultraviolet lamp tubes and used for allowing wastewater to flow, and the lower end of the irradiation pipeline is connected with a wastewater outlet of the electrochemical unit. The power unit comprises a circulating pump and a circulating pipeline and is used for driving wastewater to circularly flow. Through the synergistic effect of the titanium ruthenium anode, the palladium titanium cathode and the dual-wavelength ultraviolet lamp tube, deep removal of organic pollutants in wastewater can be realized.

Description

Technical Field

[0001] This application relates to the field of industrial wastewater treatment technology, specifically to a dual-wavelength light-excited optocoupler wastewater treatment device and modular system. Background Technology

[0002] High-salinity organic wastewater is widely found in industries such as chemical engineering, pharmaceuticals, and dyeing. It typically contains high concentrations of inorganic salts (such as NaCl) and recalcitrant organic pollutants (such as aromatic compounds), and is often accompanied by high chemical oxygen demand (COD) and toxicity, making it a typical type of difficult-to-treat wastewater. If discharged directly without effective treatment, this type of wastewater will pose a serious threat to the ecological environment and human health.

[0003] Currently, commonly used methods for treating high-salinity organic wastewater mainly include biological methods, electrochemical oxidation methods, advanced oxidation methods, and membrane separation technology. However, these methods all have varying degrees of technical bottlenecks and application limitations under high-salinity conditions. For example, biological methods are inhibited by salt ions, resulting in decreased microbial activity and a COD removal rate of less than 50%; in electrochemical oxidation methods, electrodes are prone to passivation, current efficiency decreases, and equipment lifespan is short; although advanced oxidation methods (such as Fenton reaction and ozone oxidation) can effectively generate free radicals to degrade organic pollutants, free radicals are easily quenched by salt ions, resulting in low reaction efficiency and high reagent costs.

[0004] To improve treatment efficiency, recent studies have proposed coupling multiple treatment units. For example, coupling electrochemical oxidation with ultraviolet light to form a photoelectric synergistic system can improve pollutant degradation efficiency to some extent. However, this technology still has certain limitations, such as insufficient mineralization rate, high residual rate of recalcitrant small molecule intermediates (such as carboxylic acids), which are difficult to further degrade completely, resulting in a final mineralization rate of less than 60%. This leads to potential environmental risks in the treated water, thus limiting the effectiveness of wastewater treatment.

[0005] Therefore, existing technologies still cannot meet the needs of deep mineralization and resource utilization of high-salt organic wastewater. There is an urgent need to develop a high-salt organic wastewater treatment equipment or system with high mineralization efficiency to achieve deep mineralization and green treatment of pollutants in high-salt organic wastewater. Summary of the Invention

[0006] In order to overcome or mitigate at least one of the shortcomings of the prior art, one objective of this application is to provide a dual-wavelength light-excited photoelectric coupling wastewater treatment device and modular system to solve the problem of high residual rate and insufficient mineralization rate of recalcitrant small molecule intermediate products in pollutants in high-salt organic wastewater.

[0007] To achieve the above-mentioned objectives, the present application may adopt the following technical solutions.

[0008] This application provides a dual-wavelength photoexcited photoelectric coupling wastewater treatment device, comprising an electrochemical unit including alternating titanium-ruthenium anodes and palladium-titanium cathodes. The titanium-ruthenium anodes and palladium-titanium cathodes include multiple flow holes to form a through-flow channel, and the surface of the palladium-titanium cathode is laser-clad to form a porous catalytic structure. An ultraviolet (UV) unit includes multiple dual-wavelength UV lamps and an irradiation pipe surrounding the dual-wavelength UV lamps. The emission wavelengths of the dual-wavelength UV lamps include 254 nm and 184 nm. An annular flow channel is formed between the irradiation pipe and the dual-wavelength UV lamps for wastewater flow. The lower end of the irradiation pipe is connected to the wastewater outlet of the electrochemical unit. A power unit includes a circulation pump and a circulation pipe for driving the wastewater to flow sequentially through the UV unit and the electrochemical unit, forming a closed-loop circulation.

[0009] In at least one embodiment, the titanium-ruthenium anode comprises a titanium substrate and a coating, the coating being applied to the surface of the titanium substrate, the coating being a ruthenium-iridium-tin ternary oxide comprising ruthenium oxide, iridium oxide and tin oxide, and the molar ratio of the three being 5:3:2.

[0010] In at least one embodiment, the coating has a thickness of 3 to 5 micrometers and the chlorine evolution potential of the coating relative to a standard hydrogen electrode is less than 1.8V.

[0011] In at least one embodiment, the palladium-titanium cathode comprises a TA1 titanium substrate, and the porous catalytic structure has a porosity of 40% to 60% and a pore size of 500 ± 50 micrometers.

[0012] In at least one embodiment, the ultraviolet unit is coaxially arranged with the electrochemical unit and located above the electrochemical unit.

[0013] In at least one embodiment, the wastewater treatment device includes multiple sets of anode current collector outer rings and multiple sets of cathode current collector outer rings, respectively used to connect to the titanium-ruthenium anode and the palladium-titanium cathode, and the anode current collector outer ring and the cathode current collector outer ring have the same structure; wherein, the cathode current collector outer ring has a frame-like structure with a mounting position in its central region, and the palladium-titanium cathode is fixedly installed in the mounting position. The palladium-titanium cathode is fixedly connected to the mounting position of the cathode current collector outer ring by welding to form a conductive connection; the outer periphery of the cathode current collector outer ring is provided with a sealing groove for installing a sealing element.

[0014] In at least one embodiment, the wastewater treatment device includes 1 to 15 pairs of titanium-ruthenium anodes and palladium-titanium cathodes, and the spacing between adjacent titanium-ruthenium anodes or palladium-titanium cathodes is 2 ± 0.5 mm.

[0015] In at least one embodiment, the ultraviolet unit includes 5 to 16 dual-wavelength ultraviolet lamps, and the plurality of dual-wavelength ultraviolet lamps are arranged in a ring array, wherein at least one dual-wavelength ultraviolet lamp is located at the center of the array, and the remaining dual-wavelength ultraviolet lamps are evenly distributed around the center of the array.

[0016] In at least one embodiment, the wastewater treatment device includes a control module for detecting and adjusting the operating parameters of the wastewater treatment device; wherein the control module includes a power supply, a sensor group and a PLC touch screen, and the sensor group includes a pH sensor, a redox potential sensor, a conductivity sensor and a temperature sensor.

[0017] This application also provides a modular system for photoelectric coupling wastewater treatment with dual-wavelength light excitation. The system includes multiple module units and a main pipe. The multiple module units are arranged in parallel, and the main pipe is connected to the module units. Each module unit integrates a photoelectric coupling wastewater treatment device with dual-wavelength light excitation.

[0018] By adopting the above technical solution, this application provides a dual-wavelength light-excited photoelectric coupling wastewater treatment device and modular system. Through the synergistic effect of a titanium-ruthenium anode, a palladium-titanium cathode, and a dual-wavelength ultraviolet lamp, complete mineralization of organic pollutants in the wastewater can be achieved, i.e., deep removal of organic pollutants. Furthermore, this wastewater treatment device can be modularly combined, which not only improves operational flexibility but also allows for adjustment and optimization of treatment capacity according to actual needs, thereby meeting the treatment requirements of different types of wastewater. Attached Figure Description

[0019] Figure 1 This is a front view schematic diagram of a dual-wavelength light-excited photocoupled wastewater treatment device according to an embodiment of this application;

[0020] Figure 2 This is a side view of a dual-wavelength light-excited photocoupled wastewater treatment device according to an embodiment of this application.

[0021] Figure 3 This is a top view schematic diagram of a dual-wavelength light-excited photocoupled wastewater treatment device according to an embodiment of this application.

[0022] Figure 4 for Figure 1 A schematic diagram of the electrochemical unit in the diagram;

[0023] Figure 5 This is a top view schematic diagram of the palladium-titanium cathode and the outer ring of the cathode current collector;

[0024] Figure 6 for Figure 5A schematic cross-sectional view taken along the central axis of the outer ring of the cathode current collector;

[0025] Figure 7 for Figure 6 A magnified view of a portion of the image;

[0026] Figure 8 A schematic diagram illustrating the effect of different sodium chloride contents, treatment time, and current density on COD removal rate when using a dual-wavelength light-excited photocoupled wastewater treatment device according to an embodiment of this application to treat high-salt wastewater from the dyeing and printing industry is shown.

[0027] Figure 9 A schematic diagram illustrating the effect of different treatment times on the concentration of F53B (chloropolyfluoroalkyl sulfonic acid) is shown for treating persistent organic compounds (PFAS) (perfluorinated and polyfluoroalkyl compounds) using a dual-wavelength light-excited photocoupled wastewater treatment device according to an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures

[0029] 10. Electrochemical Unit;

[0030] 11. Titanium-ruthenium anode;

[0031] 12 Palladium-titanium cathode;

[0032] 13. Flow holes;

[0033] 14. Fixing plate;

[0034] 20 ultraviolet units;

[0035] 21. Dual-wavelength ultraviolet lamp;

[0036] 22 Irradiation pipelines;

[0037] 30 Power Units;

[0038] 31. Circulating pump;

[0039] 32. Circulation piping;

[0040] 40. Control module;

[0041] 41. Power supply;

[0042] 42 sensor groups;

[0043] 43 PLC touch screen;

[0044] 50 Cathode current collector outer ring;

[0045] 51 Sealing groove;

[0046] 52 connectors Detailed Implementation

[0047] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaust all possible methods of this application, nor to limit the scope of this application.

[0048] The embodiments of this application provide a dual-wavelength light-excited photoelectric coupling wastewater treatment device (hereinafter referred to as "wastewater treatment device") and a modular system integrated based on the wastewater treatment device (hereinafter referred to as "modular system").

[0049] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of this application provides a dual-wavelength light-excited photoelectric coupling wastewater treatment device, which may include an electrochemical unit 10, an ultraviolet unit 20, a power unit 30, and a control module 40. The electrochemical unit 10 and the ultraviolet unit 20 may be arranged coaxially; preferably, the ultraviolet unit 20 may be positioned above the electrochemical unit 10.

[0051] Furthermore, the power unit 30 drives the wastewater circulation, allowing the wastewater to flow sequentially through the electrochemical unit 10 and the ultraviolet unit 20, where it receives electrochemical action and ultraviolet irradiation, respectively. This forms a deep degradation mechanism for organic pollutants along the "chlorination-dechlorination-hydroxylation-mineralization" degradation pathway, and supports circulation to achieve complete mineralization of organic pollutants. Figure 4 As shown, the electrochemical unit 10 may include alternating titanium-ruthenium anodes 11 and palladium-titanium cathodes 12, with an insulating gasket between them to prevent electrode short circuits and improve system stability. Preferably, the insulating gasket may be made of polytetrafluoroethylene, rubber, or other corrosion-resistant insulating materials.

[0052] In addition, the electrochemical unit 10 may also include a fixing plate 14, which is respectively disposed at the upper end and the lower end of the electrochemical unit 10, for positioning and fixing the electrode.

[0053] Preferably, the electrochemical unit 10 can be provided with 1 to 15 pairs of titanium-ruthenium anodes 11 and palladium-titanium cathodes 12. By arranging them alternately, both sides of each electrode can participate in the catalytic reaction, thereby improving the utilization efficiency of the electrode and saving about 40% of the electrode usage.

[0054] In different embodiments, the distance between the anode and the cathode can be adjusted according to the water quality, preferably 2±0.5 mm, or it can also be 10±0.5 mm, to adapt to different application scenarios.

[0055] Preferably, the titanium-ruthenium anode 11 uses a titanium substrate, the surface of which may be coated with a coating of 3 to 5 micrometers thickness. This coating has a chlorine evolution potential lower than 1.8V relative to a standard hydrogen electrode (vs. SHE) and a chlorine corrosion resistance life of not less than 8000 hours. In this embodiment, the coating may be a ruthenium-iridium-tin ternary oxide, which may include ruthenium oxide, iridium oxide, and tin oxide, with a molar ratio of 5:3:2. Furthermore, the coating can be uniformly applied to the surface of the titanium substrate by dip-coating or spraying.

[0056] The palladium-titanium cathode 12 can be based on a TA1 (pure titanium alloy) titanium substrate, with a porous catalytic structure formed on its surface through laser cladding. This porous catalytic structure has a porosity of 40%-60% and a pore size of 500±50 micrometers. It can be understood that the porous catalytic structure formed by laser cladding not only significantly increases the specific surface area of ​​the electrode but also introduces a large number of catalytically active sites on its surface, thereby effectively promoting the electrochemical reaction and degradation process of pollutants and improving the catalytic performance and reaction efficiency of the electrode.

[0057] Preferably, the surface of the porous catalytic structure of the palladium-titanium cathode 12 can be further loaded with a palladium catalyst layer to improve the efficiency of the hydrogen and hydroxyl radical generation reaction, thereby enhancing the reaction activity.

[0058] Furthermore, the palladium catalyst layer can be attached to the surface of the porous catalytic structure of the laser-clad palladium-titanium cathode 12 through physical adsorption, chemical reduction, sol-gel, or other methods. Preferably, the palladium loading of the palladium catalyst (i.e., the mass ratio of palladium to the support, wherein the support is a titanium substrate) can be less than 0.1%.

[0059] like Figure 5 As shown, the cross-sectional shape of the palladium-titanium cathode 12 can be circular, and multiple flow holes 13 are provided on the electrode surface to form a through flow channel, realizing the flow path of wastewater. During operation, the wastewater flows from bottom to top through the palladium-titanium cathode 12, the titanium-ruthenium anode 11, and then through the palladium-titanium cathode 12 again, etc., and enters the ultraviolet unit 20 after electrochemical treatment.

[0060] Preferably, the flow holes 13 can be asymmetrically arranged to achieve a cross-flow water distribution structure, thereby enhancing the mass transfer effect and reaction contact area.

[0061] Preferably, the wastewater flow velocity can be set to 0.05 meters per second (m / s), and the current density can be controlled between 50-500 amperes per square meter (A / m²). 2 Within the range of ).

[0062] In this embodiment, the wastewater treatment device can be configured with multiple sets of current collector outer rings to ensure the consistency of the reaction potential of each electrode. Specifically, the current collector outer rings can be divided into an anode current collector outer ring and a cathode current collector outer ring 50, which are used to connect to the titanium-ruthenium anode 11 and the palladium-titanium cathode 12 to achieve a uniform distribution of surface potential and ensure that the potential difference between any two points on the electrode surface does not exceed 10 millivolts (mV). In this embodiment, the anode current collector outer ring and the cathode current collector outer ring 50 have the same structure.

[0063] Figure 5 The structure of the cathode current collector outer ring 50 in this embodiment is shown. Figure 6 As shown, the outer ring 50 of the cathode current collector has a frame-like structure and is circular. A mounting position can be provided in its central region, and the palladium-titanium cathode 12 can be fixedly installed within this mounting position to form a conductive connection.

[0064] Preferably, the outer ring 50 of the cathode current collector can be fixedly connected to the palladium-titanium cathode 12 by laser cold welding. This process can ensure connection strength and avoid thermal deformation, thereby improving stability and conductivity reliability.

[0065] like Figure 5 and Figure 7 As shown, a sealing groove 51 can also be provided in the circumferential direction of the outer ring 50 of the cathode current collector. The sealing groove 51 is annular and is used to install sealing elements (such as O-rings), which can effectively prevent electrolyte leakage and extend the service life of the electrode.

[0066] See Figure 5 The cathode current collector outer ring 50 may also be provided with a wiring port 52 for connecting to an external circuit, so that current can be efficiently transmitted from an external load or power source to the electrode through the cathode current collector outer ring 50.

[0067] In some preferred embodiments, the diameter of the outer ring 50 of the cathode current collector can be 360 ​​mm and the thickness can be 6 mm, and the diameter of the palladium-titanium cathode 12 can be 300 mm.

[0068] Preferably, the outer ring 50 of the cathode current collector can be made of TA1 (industrial pure titanium).

[0069] like Figure 2 As shown, the ultraviolet unit 20 can be positioned above the electrochemical unit 10 to irradiate wastewater with ultraviolet light, thereby achieving a synergistic effect of photocatalysis and electrochemistry.

[0070] See Figure 3In this embodiment, the ultraviolet unit 20 may include multiple dual-wavelength ultraviolet lamps 21 and an irradiation pipeline 22. The irradiation pipeline 22 is preferably a cylindrical structure, covering the exterior of the dual-wavelength ultraviolet lamps 21 and communicating with the electrochemical unit 10. An annular flow channel is formed between the dual-wavelength ultraviolet lamps 21 and the irradiation pipeline 22 for wastewater flow. In this way, the wastewater can fully receive ultraviolet light irradiation during the flow process, thereby improving photocatalytic efficiency.

[0071] Specifically, the dual-wavelength ultraviolet lamp 21 can emit ultraviolet light of two wavelengths, 254nm and 184nm. It can dynamically switch between different wavelengths according to the wastewater treatment stage to provide the required photon energy to drive reaction processes such as hypochlorous acid excitation, free radical generation, and energy state transitions of organic molecules.

[0072] In a preferred embodiment, the ultraviolet unit 20 can be configured with 5 to 16 dual-wavelength ultraviolet lamps 21, with a total irradiation power ranging from 200 to 2000 W. The wastewater treatment device can dynamically adjust the lamp power according to the wastewater quality and load conditions to balance treatment efficiency and energy consumption control.

[0073] In addition, each dual-wavelength ultraviolet lamp tube 21 can be fitted with a quartz sleeve. The wall thickness of the quartz sleeve can be 1.5 mm, and the ultraviolet transmittance is greater than 90%, which can effectively isolate the lamp tube from wastewater and enhance the transmission efficiency and irradiation stability of ultraviolet rays.

[0074] Preferably, this embodiment may include eight dual-wavelength ultraviolet lamps 21, arranged as follows: Figure 3 As shown, a ring array structure is adopted in this embodiment. One dual-wavelength ultraviolet lamp 21 can be set at the center of the array, and the other seven dual-wavelength ultraviolet lamps 21 can be evenly distributed along the ring path around the center of the array, thereby achieving uniform coverage of the ultraviolet irradiation field.

[0075] Preferably, the diameter of the dual-wavelength ultraviolet lamp tube 21 can be 36 mm, and the other seven dual-wavelength ultraviolet lamp tubes 21 can be distributed on a ring with a diameter of 135 mm, and the diameter of the irradiation pipe 22 can be set to 219 mm to form a reasonable ultraviolet irradiation space and annular flow channel structure.

[0076] During operation, the residence time of wastewater in the irradiation pipeline 22 can be between 30 and 90 seconds, and the range of received ultraviolet dose is 400-1200 millijoules per square centimeter (mJ / cm2). In addition, the internal temperature of the wastewater treatment device can be maintained at no higher than 40°C to prevent heat accumulation from interfering with the efficiency and stability of the photosensitive reaction.

[0077] It is understood that after preliminary treatment in electrochemical unit 10, the wastewater enters ultraviolet unit 20 and undergoes catalytic irradiation in irradiation pipe 22. This process can be divided into the following two stages:

[0078] First stage: 254nm wavelength ultraviolet light excitation path.

[0079] Under the electrochemical oxidation of the titanium-ruthenium anode 11, chlorine-containing organic pollutants in wastewater are oxidized to hypochlorous acid (HClO). Under 254 nm ultraviolet irradiation, hypochlorous acid undergoes photolysis, producing chlorine free radicals (Cl-) and hydroxyl free radicals (-OH). The chlorine free radicals react with the organic pollutants, undergoing addition chlorination, while the hydroxyl free radicals disrupt the aromatic ring structure, leading to ring cleavage and chain degradation, thus achieving the degradation and mineralization of organic matter. This stage can achieve the mineralization of approximately 75% of the organic pollutants.

[0080] Second stage: 185nm ultraviolet light excitation path.

[0081] The approximately 25% of recalcitrant short-chain organic pollutants remaining after the first stage are recycled into the ultraviolet unit 20, where they are excited by 185nm high-energy ultraviolet light to form excited-state organic matter. These excited-state intermediates then flow into the electrochemical unit 10, where, under the action of the palladium catalytic layer on the surface of the palladium-titanium cathode 12, they undergo deep reactions such as defluorination and denitrification, breaking high-energy bonds such as C–F and C–N, thereby further achieving complete mineralization of the residual organic pollutants.

[0082] It is understood that the wastewater treatment device in this application embodiment uses the combined action mechanism of "electrochemical + dual-wavelength ultraviolet light" to further treat recalcitrant organic pollutants on the basis of preliminary mineralization, thereby significantly improving the removal rate and mineralization efficiency of organic pollutants in wastewater.

[0083] See Figure 1 The power unit 30 can be used to drive the wastewater to circulate between the electrochemical unit 10 and the ultraviolet unit 20, and it may include a circulation pump 31 and a circulation pipeline 32.

[0084] Specifically, the circulating pump 31 can be a corrosion-resistant variable frequency centrifugal pump, suitable for industrial wastewater treatment environments containing corrosive components. To further optimize system performance, the circulating pump 31 can also integrate a gas-liquid separator to remove accumulated air bubbles in the system and improve fluid transport stability.

[0085] In the preferred configuration, the flow rate of the circulating pump 31 is 5-20 cubic meters per hour (m3 / h), and the head can be 15 meters, ensuring sufficient material exchange between the various processing units of the system.

[0086] The circulation pipeline 32 can be a stainless steel corrosion-resistant pipe lined with polytetrafluoroethylene, and the nominal diameter (DN) can be set to DN50-DN150 to adapt to different processing scale requirements. The circulation rate (i.e., the number of times the treated liquid is circulated per unit time) is preferably 10-15 times / hour to improve the reaction rate and mass transfer efficiency.

[0087] See Figure 1 The wastewater treatment device may also include a control module 40 for intelligent operation of the equipment and dynamic adjustment of process parameters. Specifically, the control module 40 may include a power supply 41, a sensor group 42, a PLC touch screen 43, and a communication and interface module, etc.

[0088] The power supply 41 is preferably a multi-functional potentiostat with constant potential control function, supporting both constant potential and constant current operating modes. The power supply has an output voltage range of 0-10V and an output current range of 0-50A, both continuously adjustable, supporting fine control of the reaction potential to regulate the reaction rate and suppress the occurrence of side reactions.

[0089] The sensor group 42 may include multiple sensors for real-time monitoring of the operating parameters of the wastewater treatment device. Specifically, the multiple sensors may include a pH sensor, an oxidation-reduction potential (ORP) sensor, a conductivity sensor, and a temperature sensor. The measurement accuracies of each sensor are as follows: the pH sensor has an accuracy of ±0.1 mV, the ORP sensor has an accuracy of ±5 mV, the conductivity sensor has an accuracy of ±1%, and the temperature sensor has an accuracy of ±0.5 °C.

[0090] Through the real-time feedback data from the aforementioned sensor group 42, the control module 40 can achieve closed-loop adjustment of parameters such as voltage, current, circulation rate, and ultraviolet irradiation power of the wastewater treatment device, thereby dynamically optimizing treatment conditions, improving treatment efficiency, and reducing energy consumption.

[0091] In this embodiment, the communication and interface module enables real-time recording of operational data, alarm linkage, and remote operation and maintenance. Preferably, this module can be connected to an industrial DCS (Distributed Control System) / SCADA (Supervisory and Data Acquisition System) or accessed through a cloud platform to achieve remote diagnostics, system parameter optimization, and operation and maintenance management.

[0092] The PLC touchscreen 43 is used for local operation control and system monitoring. Operators can view the operating status, adjust process parameters, set operating modes, or read alarm records in real time via the touchscreen. In some preferred embodiments, the touchscreen 43's interface supports switching between Chinese and English, thus adapting to the usage needs of different industrial scenarios.

[0093] This application provides an embodiment of a photoelectric coupling wastewater treatment device based on dual-wavelength light excitation. This wastewater treatment device effectively achieves deep mineralization of organic pollutants in wastewater through the synergistic effect of a titanium-ruthenium anode 11, a palladium-titanium cathode 12, and a dual-wavelength ultraviolet lamp 21, while also achieving high treatment efficiency and low energy consumption.

[0094] Specific experimental results show that after treatment, the COD removal rate of the wastewater can reach over 90%, the total organic carbon (TOC) mineralization rate exceeds 80%, and the generation of chlorinated byproducts is reduced by approximately 70%. Meanwhile, the overall energy consumption of this wastewater treatment device is approximately 5-15 kWh / m³, which is 40% lower than traditional electrochemical treatment methods, demonstrating significant energy-saving advantages and contributing to long-term operating cost control.

[0095] In the wastewater recycling process, the wastewater treatment device can adopt a batch processing method. Specifically, during the entire treatment cycle, only a specific amount of wastewater is treated each time until the current batch of wastewater is completely treated. After the current batch of wastewater is treated, the next batch of wastewater recycling treatment begins to avoid cross-contamination or interference.

[0096] Embodiments of this application also provide a modular wastewater treatment system based on dual-wavelength light excitation and optocoupler configuration. This system may include multiple parallel-connected modular units and a main pipe for connecting each modular unit, with the main pipe enabling unified hydraulic connection and scheduling. Each modular unit can integrate the optocoupler wastewater treatment device provided in this application, exhibiting standardization, integration, and scalability.

[0097] Specifically, each module can adopt a standard container frame structure, facilitating transportation and rapid on-site installation and assembly. Test data shows that a single module can handle 10-50 m³ / d (m³ / day); when multiple modules are connected in parallel, the wastewater treatment capacity can be expanded through a main pipe, achieving a maximum wastewater treatment scale of 500 m³ / d, suitable for various scenarios such as industrial parks, wastewater treatment plants, and emergency treatment.

[0098] The treatment effect of the wastewater treatment device provided in this application will be described in detail below, taking into account typical types of industrial wastewater. Specifically, two representative highly polluting wastewaters were selected for treatment evaluation: high-salt organic wastewater from the dyeing and printing industry and electroplating wastewater containing perfluorinated and polyfluorinated alkyl compounds (PFAS).

[0099] Example 1

[0100] The wastewater treatment device provided in this embodiment treats high-salt wastewater from the printing and dyeing industry.

[0101] The wastewater has the following characteristics: Chemical oxygen demand (COD): 500-800 mg / L, total dissolved solids (TDS, calculated as NaCl): 48000-60000 mg / L, contains organic pollutants such as azo dyes, dispersants and auxiliaries, has poor biodegradability and high color.

[0102] The operating parameters are as follows:

[0103] Electrochemical Unit 10: Constant current mode, current set to 50A, voltage set to 5V;

[0104] Ultraviolet Unit 20: The total power of the ultraviolet lamps is set to 1200W, and the residence time of wastewater in the irradiation pipe is set to 60s;

[0105] Power unit 30: The flow rate of the circulating pump 31 is set to 15 m3 / h, and the pH is controlled between 6.8 and 7.2.

[0106] After 6 hours of continuous operation, the effluent was tested. The results showed that the COD was reduced to 100 mg / L, the color removal rate reached 99.5%, and no chlorinated organic pollutants were detected.

[0107] Figure 8 The study illustrates the changing trends of COD removal rate in wastewater under different sodium chloride concentrations (0.5 wt% to 1.5 wt%, where wt% represents weight percentage), current densities, and treatment times. The results show that, at the same sodium chloride concentration, the COD removal rate in wastewater significantly increases with increasing current density. Furthermore, treatment time also has a significant impact on COD removal efficiency.

[0108] like Figure 8 As shown in the figure, two processing times (2 hours and 3 hours) and two current densities (30 mA / cm²) are illustrated. 2 and 50mA / cm 2 The corresponding wastewater treatment effect was analyzed. Results showed that the COD removal rate in wastewater treated for 3 hours was generally higher than that treated for 2 hours, while the COD removal rate at 50 mA / cm³ was... 2 The COD removal rate in wastewater at the current density was also significantly better than that at 30 mA / cm³. 2 .

[0109] Furthermore, especially when the sodium chloride dosage ranges from 0.5 wt% to 1.5 wt%, the current density reaches 50 mA / cm². 2 Furthermore, with a treatment time of 3 hours, the COD removal rate can approach 100%. This demonstrates that by rationally controlling parameters such as current density and treatment time, efficient degradation and deep mineralization of organic pollutants in wastewater can be achieved.

[0110] Example 2

[0111] The wastewater treatment device described in this application is used to treat the degradation of persistent organic pollutants PFAS. At the same time, a representative PFAS pollutant, namely chlorinated polyfluoroether sulfonic acid (F53B), is selected as the target pollutant, and relevant degradation experiments are carried out.

[0112] The operating parameters are as follows:

[0113] Electrochemical Unit 10: Constant current mode, current set to 20A, voltage set to 5V;

[0114] Ultraviolet Unit 20: Total power set to 1200W;

[0115] Power unit 30: The circulation rate of the circulating pump 31 is set to 20 times per hour.

[0116] After the wastewater treatment device has been running for 1 hour, the effluent is tested. The removal rate of F53B exceeds 95%, which is basically reduced to below the detection limit.

[0117] Figure 9 The trend of F53B concentration variation under different treatment times is shown. The vertical axis represents the ratio of the F53B concentration (C) to the initial concentration (C0). The results show that the F53B concentration decreases significantly with increasing treatment time. After 1 hour of treatment, the F53B concentration almost reaches below the detection limit.

[0118] Therefore, the wastewater treatment device provided in this application demonstrates excellent treatment effect on structurally stable and recalcitrant PFAS pollutants, and has broad application prospects and engineering promotion value.

[0119] It should be understood that the above-described embodiments, examples, or examples are merely exemplary and are not intended to limit this application. Those skilled in the art can make various modifications and changes to the above-described embodiments, examples, or examples under the teachings of this application without departing from the scope of this application.

Claims

1. A photoelectric coupling wastewater treatment device excited by dual-wavelength light, characterized in that, include: An electrochemical unit (10) includes alternating titanium ruthenium anodes (11) and palladium titanium cathodes (12), wherein the titanium ruthenium anodes (11) and the palladium titanium cathodes (12) include a plurality of flow holes (13) to form a through flow channel, and the surface of the palladium titanium cathodes (12) is laser clad to form a porous catalytic structure; The ultraviolet unit (20) includes multiple dual-wavelength ultraviolet lamps (21) and an irradiation pipe (22) covering the outside of the dual-wavelength ultraviolet lamps (21). The emission wavelengths of the dual-wavelength ultraviolet lamps (21) include 254nm and 184nm. An annular flow channel is formed between the irradiation pipe (22) and the dual-wavelength ultraviolet lamps (21) for the flow of wastewater. The lower end of the irradiation pipe (22) is connected to the wastewater outlet of the electrochemical unit (10). The power unit (30) includes a circulation pump (31) and a circulation pipeline (32) for driving the wastewater to flow sequentially through the ultraviolet unit (20) and the electrochemical unit (10).

2. The photoelectric coupling wastewater treatment device excited by dual wavelength light according to claim 1, characterized in that, The titanium-ruthenium anode (11) includes a titanium substrate and a coating. The coating is applied to the surface of the titanium substrate. The coating is a ruthenium-iridium-tin ternary oxide, which includes ruthenium oxide, iridium oxide and tin oxide, and the molar ratio of the three is 5:3:

2.

3. The photoelectric coupling wastewater treatment device excited by dual-wavelength light according to claim 2, characterized in that, The coating has a thickness of 3 to 5 micrometers and a chlorine evolution potential of less than 1.8V relative to a standard hydrogen electrode.

4. The photoelectric coupling wastewater treatment device excited by dual-wavelength light according to claim 1, characterized in that, The palladium-titanium cathode (12) includes a TA1 titanium substrate, and the porous catalytic structure has a porosity of 40% to 60% and a pore size of 500 ± 50 micrometers.

5. The photoelectric coupling wastewater treatment device excited by dual-wavelength light according to claim 1, characterized in that, The ultraviolet unit (20) is coaxially arranged with the electrochemical unit (10) and located on the upper part of the electrochemical unit (10).

6. The photoelectric coupling wastewater treatment device excited by dual-wavelength light according to claim 1, characterized in that, The wastewater treatment device includes multiple sets of anode current collector outer rings and multiple sets of cathode current collector outer rings (50), which are respectively used to connect to the titanium ruthenium anode (11) and the palladium titanium cathode (12), and the anode current collector outer rings and the cathode current collector outer rings (50) have the same structure; The cathode current collector outer ring (50) has a frame-like structure with a mounting position in its central area. The palladium-titanium cathode (12) is fixedly installed in the mounting position. The palladium-titanium cathode (12) is fixedly connected to the mounting position of the cathode current collector outer ring (50) by welding to form a conductive connection; the outer periphery of the cathode current collector outer ring (50) is provided with a sealing groove (51) for installing a sealing element.

7. The photoelectric coupling wastewater treatment device excited by dual wavelength light according to any one of claims 1 to 6, characterized in that, The wastewater treatment device includes 1 to 15 pairs of titanium-ruthenium anodes (11) and palladium-titanium cathodes (12), and the spacing between adjacent titanium-ruthenium anodes (11) or palladium-titanium cathodes (12) is 2 ± 0.5 mm.

8. The photoelectric coupling wastewater treatment device excited by dual wavelength light according to claim 1, characterized in that, The ultraviolet unit (20) includes 5 to 16 dual-wavelength ultraviolet lamps (21), and the dual-wavelength ultraviolet lamps (21) are arranged in a ring array, wherein at least one dual-wavelength ultraviolet lamp (21) is located at the center of the array, and the remaining dual-wavelength ultraviolet lamps (21) are evenly distributed around the center of the array.

9. The photoelectric coupling wastewater treatment device excited by dual wavelength light according to any one of claims 1 to 8, characterized in that, The wastewater treatment device includes a control module (40) for detecting and adjusting the operating parameters of the wastewater treatment device; The control module (40) includes a power supply (41), a sensor group (42), and a PLC touch screen (43). The sensor group (42) includes a pH sensor, a redox potential sensor, a conductivity sensor, and a temperature sensor.

10. A modular wastewater treatment system with dual-wavelength light excitation and photocoupler coupling, characterized in that, The system includes multiple modular units and a main pipe, with the multiple modular units connected in parallel and the main pipe connected to the modular units. Each of the module units integrates a dual-wavelength light-excited photoelectric coupling wastewater treatment device as described in any one of claims 1 to 9.

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