Photoelectrocatalytic oxidation equipment

Abstract

The utility model relates to the technical field of environmental protection, and particularly discloses photoelectric catalytic oxidation equipment. Comprising an upper tank body and a lower tank body, the upper tank body and the lower tank body are detachably connected, and the interiors of the upper tank body and the lower tank body are hollow and are provided with accommodating spaces; a water inlet pipe and a feeding pipe are arranged at the top of the upper tank body; a first mounting plate and a second mounting plate are arranged in the upper tank body; a first electrode plate and a second electrode plate are arranged on the first mounting plate; at least two lamp tubes are arranged on the second mounting plate; the first electrode plate and the second electrode plate are electrified through the first mounting plate; the first electrode plate and the second electrode plate can generate conductive particles after being electrified, and the conductive particles replace traditional plate electrodes, so that the specific surface area and the mass transfer rate of the electrodes are greatly improved, potential distribution of a solution in the photoelectrocatalytic oxidation equipment is relatively uniform, and a solution main body has a uniform electric field and a temperature field; and a good place is provided for the photoelectrocatalytic oxidation reaction.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, in particular to a photoelectrocatalytic oxidation device. Background Art

[0002] In the process of pharmaceutical and chemical production, the wastewater discharged has a high concentration of pollutants and complex components. The wastewater may contain, but is not limited to, the following pollution factors: organic components such as formaldehyde, formic acid, ethanol, allyl chloride, dichloromethane, dichloroethane, chloroform, acetone, MEA, BPS, tetrahydrofuran, DMF, isopropanol, absolute ether, acetonitrile, ethyl acetate, isooctanoic acid, phenylacetonitrile, toluene, chlorobenzene, etc. The components are quite complex, and the wastewater contains a considerable amount of macromolecules, long chains, cyclic and benzene ring-containing organic substances that are not easily biodegradable or non-biodegradable. At the same time, some wastewater also contains a relatively high concentration of halogen ions, etc., resulting in a very high salinity of this part of the wastewater. The high-concentration production process wastewater itself has strong biological toxicity. The CODcr (dichromate) in the wastewater is mainly composed of complex organic substances, and it is a four-high organic pharmaceutical wastewater with high concentration, high salinity, high chroma, and high biological toxicity. Therefore, it cannot directly enter the biochemical treatment system and must be pre-treated in advance to improve its biodegradability and reduce biological toxicity so as to meet the requirements of subsequent microorganisms in the biochemical system for absorption. The photoelectrocatalytic oxidation device is to fill granular or other debris-like working electrode materials between the electrodes of a traditional two-dimensional electrolytic cell, and make the surface of the filled granular electrode material charged to become a new electrode (the third electrode), and an electrochemical reaction can occur on the surface of the working electrode material. The basic principle of photoelectrocatalytic oxidation for treating wastewater is an electrocatalytic oxidation-reduction reaction, which can increase the surface-to-volume ratio of the electrolytic cell, improve the current efficiency and treatment effect. In the liquid-solid two-phase or gas-liquid-solid three-phase reaction, due to the complex flow behavior of the fluid in the reactor, it is generally considered that the chemical reaction occurs at the phase interface. The total reaction rate of the traditional flat electrode reactor is mainly controlled by the mass diffusion process, and the mass transfer and heat transfer rate of the system is relatively slow.

[0003] In the patent "Device for Synergistically Treating High-Salt Wastewater by Photoelectrocatalytic Oxidation-Electrochemical Adsorption" (publication number CN206599485U, hereinafter referred to as the prior art 1), a photoelectrocatalytic oxidation device is disclosed. In the prior art 1, through the synergistic cooperation of the photoelectrocatalytic oxidation device, the first electrochemical adsorption module and the second electrochemical adsorption module, the organic substances in the high-salt wastewater are effectively degraded and the salt is removed. By alternately performing the electrochemical adsorption treatment and regeneration treatment of the high-salt wastewater by the first electrochemical adsorption module and the second electrochemical adsorption module, the stability of the synergistic treatment of high-salt wastewater by photoelectrocatalytic oxidation-electrochemical adsorption is ensured. By adjusting the distance between the anode electrode plate, the cathode electrode plate and the ultraviolet lamp, the uneven dispersion of pollutants generated by the degradation of organic substances during the reaction process is eliminated, the efficiency of the synergistic treatment of high-salt wastewater by photoelectrocatalytic oxidation-electrochemical adsorption is improved, and the stability of its operation is ensured.

[0004] Although a photoelectrocatalytic oxidation device is provided in the prior art 1, an ultraviolet lamp tube and a cathode and anode electrode plate are provided inside the photoelectrocatalytic oxidation device. However, only one water inlet pipe for wastewater is provided in the prior art 1, and the treatment effect of the wastewater by only the ultraviolet lamp tube and the cathode and anode electrode plate inside the photoelectrocatalytic oxidation device is not ideal. Moreover, the pipe orifice where the solid-liquid separation device is connected to the photoelectrocatalytic oxidation device in the prior art 1 is prone to blockage, which is not convenient for the filtration work of the filter residue. Utility Model Content

[0005] In view of this, the embodiments of the present utility model provide a photoelectrocatalytic oxidation device to solve the problem that the wastewater treatment components provided inside the photoelectrocatalytic oxidation device in the prior art result in an unsatisfactory wastewater treatment effect and a poor treatment effect.

[0006] The embodiments of the present utility model provide a photoelectrocatalytic oxidation device, including an upper tank body and a lower tank body; the upper tank body and the lower tank body are detachably connected, and the inside of the upper tank body and the lower tank body is hollow and provided with an accommodation space; a water inlet pipe and a feed pipe are provided at the top of the upper tank body; a first mounting plate and a second mounting plate are provided inside the upper tank body; a certain interval is provided between the first mounting plate and the second mounting plate; the first mounting plate and the second mounting plate communicate with the accommodation space; a first electrode plate and a second electrode plate are provided on the first mounting plate; at least two lamp tubes are provided on the second mounting plate; the first electrode plate, the second electrode plate, and the lamp tubes all extend from the upper tank body towards the lower tank body; the first electrode plate and the second electrode plate are energized through the first mounting plate; the lamp tubes are energized through the second mounting plate.

[0007] Preferably, the first electrode plate is set as the anode; the second electrode plate is set as the cathode.

[0008] Preferably, the lamp tube is a UV lamp tube.

[0009] Preferably, a filter residue cavity and a drainage cavity are provided inside the lower tank body; a filter residue plate is provided between the filter residue cavity and the drainage cavity, and a filter membrane and a filter element are provided on the filter residue plate (232); through holes are provided on the filter element.

[0010] Preferably, the lower tank body is provided with an air inlet; the installation height of the air inlet is the same as the installation height of the filter residue plate.

[0011] Preferably, the filter residue cavity and the drainage cavity are respectively provided with a slag discharge port and a drainage port.

[0012] Preferably, a first valve is provided at the pipe orifice of the feed pipe; a valve port connected by a flange is provided at the bottom of the lower tank body; the valve port is closed by a second valve.

[0013] Preferably, an expansion joint is provided at the connection between the upper tank body and the lower tank body, and the expansion joint fixedly connects the upper tank body and the lower tank body.

[0014] Preferably, the UV lamp tube extends to a position at the top of the filter residue chamber; the first electrode plate and the second electrode plate extend to a position at the bottom of the filter residue chamber.

[0015] Preferably, a first mounting portion and a second mounting portion are provided outside the lower tank body; the lower tank body is fixed through the first mounting portion and the second mounting portion.

[0016] The photoelectrocatalytic oxidation device provided by the present utility model has the following beneficial effects:

[0017] In the photoelectrocatalytic oxidation device, after the first electrode plate and the second electrode plate are energized, conductive particles are generated. By using the conductive particles instead of the traditional flat electrode, the electrode specific surface area and the mass transfer rate are greatly improved, making the potential distribution of the solution in the photoelectrocatalytic oxidation device relatively uniform, and the main body of the solution has a uniform electric field and temperature field, providing a good place for the photoelectrocatalytic oxidation reaction. And by providing a plurality of inlets, different treatment agents can be added when treating wastewater. Under the action of the lamp tube, the treatment agent and the high-efficiency multi-dimensional electrolysis combination process for high-concentration wastewater, a large amount of substances with strong oxidizing properties are generated, which can oxidize and decompose the toxic and harmful substances and non-biodegradable organic substances in the wastewater, thereby effectively reducing the biological toxicity of the wastewater and making the wastewater meet the treatment standards required by environmental protection. Compared with the prior art, the treatment in the present utility model reaches a higher environmental protection standard and treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the embodiments of the present utility model will be briefly introduced below. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings, and all of them are within the protection scope of the present utility model.

[0019] Figure 1 is a schematic internal structure diagram of a photoelectrocatalytic oxidation device;

[0020] Figure 2 is a schematic internal structure diagram of the upper tank body of a photoelectrocatalytic oxidation device;

[0021] Parts and numbers in the figure:

[0022] 100 - upper tank body, 110 - water inlet pipe, 111 - first valve, 120 - feed pipe;

[0023] 200 - Lower tank body, 210 - First mounting plate, 211 - First electrode plate, 212 - Second electrode plate, 213 - Anode, 214 - Cathode, 220 - Second mounting plate, 221 - UV lamp tube, 230 - Filter residue chamber, 231 - Air inlet, 232 - Filter residue plate, 233 - Discharge port, 240 - Drainage chamber, 241 - Valve port, 242 - Second valve, 243 - Drainage port, 251 - First mounting portion, 252 - Second mounting portion;

[0024] 300 - Accommodating space;

[0025] 400 - Expansion joint. Specific embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. Moreover, the terms "include", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article, or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article, or device including the said elements. If there is no conflict, the embodiments of the present utility model and the various features in the embodiments can be combined with each other, and all are within the protection scope of the present utility model.

[0027] Embodiment 1

[0028] Please refer to Figure 1, the embodiment of the present utility model provides a photoelectrocatalytic oxidation device. In this device, a certain amount of hydrogen peroxide is added to the high-concentration pharmaceutical wastewater, and they are fully mixed in the device. Then, under the irradiation of ultraviolet light with a certain frequency, hydrogen peroxide generates a large number of hydroxyl radicals and high-energy oxygen under the action of light radiation. The complex organic matter in the wastewater is oxidized and decomposed by the strong oxidizing property of hydroxyl radicals and high-energy oxygen, thereby reducing the biological toxicity of the wastewater and improving the biodegradability of the wastewater. At the same time, part of the CODcr (dichromate) in the wastewater is removed. This device is easy to use, saves energy consumption, and has a low operating cost.

[0029] A photoelectrocatalytic oxidation device mainly consists of two main parts: a water inlet pipe 110 and a lower tank body 200. These two parts perform their respective functions and play different roles. The water inlet pipe 110 is mainly responsible for introducing wastewater and hydrogen peroxide, while the lower tank body 200 is responsible for mixing the wastewater and hydrogen peroxide and treating the mixed liquid after mixing. The basic principle of photoelectrocatalytic oxidation for treating wastewater is an electrocatalytic oxidation-reduction reaction, which can increase the surface-to-volume ratio of the electrolytic cell, improve the current efficiency and treatment effect.

[0030] Please refer to Figure 1 , the water inlet pipe 110 and the lower tank body 200 are designed with a detachable connection configuration, which is convenient for later maintenance and cleaning. These two tank bodies are hollow inside and are provided with a special accommodation space 300. The main function of this accommodation space 300 is to treat wastewater. This space needs to accommodate the components for treating wastewater, and it can also effectively treat and purify the wastewater to meet environmental protection requirements. This space can not only accommodate wastewater but also various wastewater treatment equipment and devices to complete the wastewater treatment work. Generally speaking, the setting of the water inlet pipe 110 and the lower tank body 200 not only facilitates later maintenance and cleaning but also improves the efficiency and quality of wastewater treatment.

[0031] At the top of the water inlet pipe 110, there is a water inlet pipe and a feed pipe 120. The water inlet pipe and the feed pipe 120 are installed at the top of the water inlet pipe 110 to meet different treatment requirements. The main function of the water inlet pipe is to allow wastewater to flow smoothly into the tank body for necessary treatment. This design ensures the smooth progress of the wastewater treatment process and avoids various problems that may be caused by the inability of wastewater to enter the tank body in a timely manner. At the same time, the feed pipe 120 is designed to add solvents or solutions such as hydrogen peroxide for treating wastewater to the wastewater. Such a design makes the wastewater treatment process more efficient, can quickly remove harmful substances in the wastewater, and protect the environment. These two pipes make the entire wastewater treatment process more efficient and environmentally friendly.

[0032] Please refer to Figure 2, a first mounting plate 210 and a second mounting plate 220 are provided in the water inlet pipe 110; there is a certain interval between the first mounting plate 210 and the second mounting plate 220; the first mounting plate 210 and the second mounting plate 220 communicate with the accommodation space 300; a first electrode plate 211 and a second electrode plate 212 are provided on the first mounting plate 210; at least two lamp tubes are provided on the second mounting plate 220; the first electrode plate 211, the second electrode plate 212 and the lamp tubes all extend from the water inlet pipe 110 towards the lower tank body 200; the first electrode plate 211 and the second electrode plate 212 are energized through the first mounting plate 210; the lamp tubes are energized through the second mounting plate 220.

[0033] Please refer to Figure 1 , the present invention relates to an internal device of a tank body, and the device includes a water inlet pipe 110 and a lower tank body 200, wherein a first mounting plate 210 and a second mounting plate 220 are provided in the water inlet pipe 110. A certain interval is maintained between these two mounting plates to ensure the stability and effectiveness of the device. In addition, these two mounting plates communicate with the accommodation space 300 in the tank body, which enables the device to be more flexibly applied to various environments. Inside these two mounting plates, cavities for the passage of circuits are provided, and the power supply circuits of the first electrode plate 211, the second electrode plate 212 and the lamp tubes are arranged in the cavities to provide electrical energy for the first electrode plate 211, the second electrode plate 212 and the lamp tubes. Specifically, a first electrode plate 211 and a second electrode plate 212 are provided on the first mounting plate 210, and at least two lamp tubes are provided on the second mounting plate 220. The two lamp tubes play a role in disinfecting and sterilizing the wastewater. The first electrode plate 211, the second electrode plate 212 and the lamp tubes all extend from the water inlet pipe 110 towards the lower tank body 200 so that they can come into contact with the wastewater. At the same time, the first electrode plate 211 and the second electrode plate 212 are energized through the first mounting plate 210, while the lamp tubes are energized through the second mounting plate 220. After being energized, they each play their roles and achieve the effect of purifying the wastewater.

[0034] Please refer to Figure 2 , the first electrode plate 211 is set as the anode 213; the second electrode plate 212 is set as the cathode 214. After being energized, an ionization reaction is generated on the wastewater through the anode and cathode. The first is a reaction similar to iron-carbon micro-electrolysis, but since the reaction potential is much higher than that of iron-carbon micro-electrolysis, the reaction is much more intense; the second is a more important reaction for the generation of hydroxyl radicals, which iron-carbon micro-electrolysis does not have. The specific reactions are as follows:

[0035] The first reaction:

[0036] Micro-anode: X - 2e → X 2+ (X 2+ represents the positive electrode);

[0037] E 0 (X 2+ / X) = -12.0~-24 V (“E 0 ”- standard electrode potential, “X 2+ / X” - half-reaction);

[0038] Micro-cathode:

[0039] 2H⁺ + 2e → 2[H] → H₂ (in weakly acidic solution, pH ≤ 5) (“H⁺” - hydrogen ion, “e” - electron, “[H]” - hydrogen atom, “H₂” - hydrogen molecule);

[0040] E 0 (H⁺ / H₂) = 0.00 V;

[0041] O₂ + 4H⁺ + 4e → 2H₂O (in weakly acidic solution, pH ≤ 5);

[0042] E 0 (O₂ / H₂O) = 12 - 24 V.

[0043] The second reaction:

[0044] When analyzing the electrochemical treatment mechanism of wastewater, the following reactions also occur in the wastewater when it is electrified:

[0045] O₂+H₂O+2e (electrified) → HO₂⁻+OH⁻ (“HO₂⁻” - perhydroxide, “OH⁻” - hydroxide);

[0046] HO₂⁻ → OH⁻+[O] (“[O]” - oxygen atom);

[0047] 2OH⁻ - 2e → H₂O+[O];

[0048]

[0049] This is the source of the newly generated oxygen ([O]) and hydroxyl radicals ( ) that play a strong oxidation role in the photo-electrocatalytic oxidation treatment of high-difficulty and refractory wastewater. The oxidation-reduction potential of hydroxyl radicals ( ) is extremely high, far exceeding the oxidation-reduction potentials of hydrogen peroxide and hypochlorite ions, and even higher than that of fluorine. Therefore, its oxidizing property is extremely strong and it can oxidize and decompose most organic substances.

[0050] In summary, the main mechanism of the photo-electrocatalytic oxidation for removing pollutants in high-concentration and refractory organic wastewater is:

[0051] Reduction: The nascent hydrogen generated by photo-electrocatalytic oxidation decolorizes some chromogenic groups.

[0052] Oxidation: A certain amount of nascent oxygen and hydroxyl radicals generated by photo-electrocatalytic oxidation have strong oxidizing properties. They can directly oxidize some organic substances into carbon dioxide and water, and at the same time oxidize some stubborn macromolecular and long-chain organic substances into small-molecular and short-chain biodegradable organic substances.

[0053] Please refer to Figure 2 , the lamp tube is the UV lamp tube 221. Under the action of the UV lamp tube 221 + H2O2 + high-efficiency multi-dimensional electrolysis combined process, a large amount of hydroxyl radicals and high-energy oxygen are generated. Both of these substances have strong oxidizing properties, which can oxidize and decompose toxic and harmful substances and non-biodegradable organic substances in the wastewater, thus effectively reducing the biological toxicity of the wastewater. In summary, the UV lamp tube 221 + H2O2 + photo-electrocatalytic oxidation composite equipment is a device for pre-treating high-concentration wastewater with good treatment effect and economic applicability. The economy is mainly reflected in only adding a small amount of hydrogen peroxide, not needing to replace the filler, and having extremely low power consumption. It is mainly reflected in the integration of the equipment, stable operation, convenient operation and management, and simple maintenance.

[0054] Please refer to Figure 1 , further, a filter residue chamber 230 and a drainage chamber 240 are designed in the lower tank body 200; between these two parts, a filter residue plate 232 is provided. In this way, when treating wastewater containing filter residue, the filter residue plate 232 can effectively separate the filter residue from the treated wastewater to ensure that they can be discharged separately. This can not only ensure the quality of the discharged wastewater but also effectively treat the filter residue, avoiding waste of resources and conforming to the concept of sustainable development. The filter residue plate 232 is provided with a filter membrane and a filter element; the filter element is provided with through holes. The filter membrane is arranged on the filter element. The filter residue is filtered out through the filter membrane, and the filter residue remains on the filter membrane and is discharged through the filter residue port 233. The wastewater then enters the drainage chamber 240 after passing through the filtration of the filter element. The filter element has an adsorption and purification effect and can be an adsorption material such as activated carbon, and the wastewater is introduced into the drainage chamber through the through holes provided thereon. Further, the through holes are set as curved holes, so that the wastewater can have a larger contact area with the filter element. When the filter membrane is blocked by the filter residue, air can be introduced through the air inlet 231 to move the filter residue on the filter membrane and avoid blockage.

[0055] Furthermore, the tank body is provided with an air inlet 231, and the position of the air inlet 231 is set to be consistent with the position of the filter residue plate 232. The main function of the air inlet 231 is to connect to an external blower to provide sufficient air flow for the wastewater in the tank to achieve stirring, so that the wastewater and hydrogen peroxide or other treatment agents can undergo sufficient mixing reactions. This not only improves the treatment efficiency but also ensures the quality of wastewater treatment. After the air inlet 231 intakes air, the air blows the wastewater and filter residue in the tank, and the wastewater and hydrogen peroxide or treatment reagents are mixed in the accommodation space 300 to achieve an environmental protection effect. Then, the slag is treated through the slag discharge port 233.

[0056] Please refer to Figure 1 , the filter residue chamber 230 and the drainage chamber 240 are respectively provided with a slag discharge port 233 and a drainage port 243. The filter residue chamber 230 and the drainage chamber 240 are respectively provided with a slag discharge port 233 and a drainage port 243. This design is to facilitate the effective management and discharge of filter residue and drainage. The filter residue chamber 230 discharges the filtered solid waste through the slag discharge port 233, while the drainage chamber 240 discharges the filtered solid waste through the drainage port 243. Such a design not only facilitates the treatment of waste but also ensures the smooth progress of the entire filtration process. The slag discharge port 233 and the drainage port 243 are arranged in parallel, and the height of the drainage port 243 is set lower than the height of the slag discharge port 233. When discharging the treated wastewater, the wastewater is first discharged through the drainage port 243, and then the filter residue is discharged through the slag discharge port 233. Furthermore, the filter residue plate 232 is inclined. The lower end of the filter residue plate 232 is arranged at one end of the slag discharge port 233, which can more conveniently discharge the filter residue.

[0057] Please refer to Figure 1 , a first valve 111 is provided at the pipe orifice of the feed pipe 120; a valve port 241 connected by a flange is provided at the bottom of the lower tank body 200; the valve port 241 is closed by a second valve 242. Under normal circumstances, both the feed pipe 120 and the valve port 241 are closed. The feed pipe 120 is opened when adding hydrogen peroxide or other treatment agents, while the valve port 241 is opened when discharging the residual wastewater or cleaning the lower tank body 200.

[0058] Please refer to Figure 1, an expansion joint 400 is provided at the connection between the water inlet pipe 110 and the lower tank body 200, and the expansion joint 400 fixedly connects the water inlet pipe 110 and the lower tank body 200. In this system, the water inlet pipe 110 and the lower tank body 200 are connected together by an expansion joint 400. This expansion joint 400 plays a key role. It not only tightly fixes the water inlet pipe 110 and the lower tank body 200 together to ensure their stability, but also provides a certain elasticity, so that under the influence of temperature changes or other external factors, the water inlet pipe 110 and the lower tank body 200 can expand and contract relatively freely without causing damage to the entire system. This design takes into account various situations that may occur in practical applications, thus greatly improving the reliability and stability of the system. In this way, the addition of the expansion joint 400 not only ensures the fixed connection between the water inlet pipe 110 and the lower tank body 200, but also guarantees the normal operation and long-term stability of the entire system.

[0059] The UV lamp tube 221 is designed to be installed at the top of the filter residue chamber 230, and it can effectively irradiate the filter residue; at the same time, the first electrode plate 211 and the second electrode plate 212 are extended to the bottom of the filter residue chamber 230, and their function is to perform electrode operations to achieve the treatment and control of the filter residue.

[0060] To improve the stability and safety of the equipment, a preferred design is to provide a first mounting portion 251 and a second mounting portion 252 outside the lower tank body 200. The main function of these two mounting portions is to connect with other parts of the equipment, and they can also be used to fixedly install or disassemble the lower tank body 200 to ensure its stability and reliability during use. In this way, whether the equipment is in operation or stopped, the lower tank body 200 can maintain a good working state, thereby improving the overall working efficiency and service life of the equipment.

[0061] The core mechanism of the photocatalytic oxidation technology in treating wastewater is based on the complex process of electrocatalytic oxidation-reduction reaction. This technology significantly improves the utilization efficiency of the current and the overall treatment effect by enhancing the ratio of the surface area to the volume of the electrolytic cell. During the interaction reaction process of the liquid and solid phases, or the gas, liquid and solid phases, the flow characteristics of the liquid are particularly complex inside the reactor. The general view is that chemical reactions mainly occur on the contact surfaces of each phase boundary. In a traditional flat electrode reactor, the total reaction rate is often dominated by the mass diffusion process, which leads to a reduction in the mass transfer and heat transfer efficiency.

[0062] However, in the design of a photo-electrocatalytic oxidation reactor, conductive particles are used as electrode materials, which greatly increases the specific surface area of the electrode and significantly improves the mass transfer efficiency. Compared with traditional flat electrodes, this design makes the potential distribution in the electrode reactor more uniform, ensuring that the entire bulk solution is affected by a uniform electric field and temperature field. Such an environment is extremely favorable for the photo-electrocatalytic oxidation reaction. It not only optimizes the reaction conditions but also provides an efficient degradation environment for those organic substances that are difficult to degrade. Therefore, in this way, the photo-electrocatalytic oxidation technology shows great potential and advantages in improving the efficiency of wastewater treatment, especially for those organic pollutants that are difficult to treat by traditional methods.

[0063] This device is designed and developed specifically for treating wastewater with a high concentration in the pharmaceutical industry. As an advanced pre-treatment technology, it conducts preliminary treatment on high-concentration wastewater, and its advantages are manifested in the following aspects: First, this device adopts a process technology combining UV photolysis, H2O2 oxidation, and high-efficiency multi-dimensional electrolysis, enabling a large number of hydroxyl radicals and highly reactive oxygen to be generated during the treatment of high-concentration wastewater. These two strongly oxidizing substances can effectively oxidize and decompose the toxic and harmful components and the organic substances that are difficult to biodegrade in the wastewater, thereby significantly reducing the biological toxicity of the wastewater. Second, through this series of complex chemical reaction processes, this device can convert large-molecule and difficult-to-biodegrade organic substances into small-molecule and easily-biodegrade organic substances, which greatly improves the biodegradability of the wastewater. This device has a significant degradation effect on the chemical oxygen demand (CODcr) in the wastewater. Usually, the removal efficiency of CODcr can reach a high level of 20% to 50%. In addition, this device also has an excellent decolorization function, which can effectively remove the pigments in the wastewater and improve the effluent quality.

[0064] The operation of the device is very stable, and the operation and management are extremely convenient. There is no need for complex maintenance procedures, ensuring continuous and stable operation. Finally, it is worth mentioning that the operation cost of this device is extremely low, which is mainly due to its high-efficiency operation principle and low-cost consumable requirements, reducing the economic burden on enterprises and making contributions to environmental protection at the same time.

[0065] Before using this equipment, a series of preparatory work needs to be carried out to ensure the normal operation of the equipment and the personal safety of the operators. First of all, it is necessary to check whether the main power supply meets the power requirements of the equipment. This is a very important step because if the power supply does not meet the requirements, it may cause the equipment to malfunction and even lead to safety accidents. Next, it is necessary to check whether all the connection parts of the equipment are in good contact and have been well insulated to prevent current leakage and ensure operation safety. In addition, it is also necessary to check whether the shell of the electrolysis power supply is well grounded to ensure operation safety.

[0066] After confirming that all these details are correct, turn on the electrolysis power supply switch and adjust the current and voltage to the appropriate range. Then, turn on the switch of the UV lamp tube 221 and the external blower (the external blower is connected to the equipment through the air inlet 231) to introduce air. These steps are all for preparing the electrolysis process of the equipment. Then, the first valve 111 of the water inlet pipe 110 can be opened to evenly introduce the wastewater into the UVECR reactor at the designed flow rate. After the wastewater enters the reactor, add hydrogen peroxide, and then close the first valve 111.

[0067] After the wastewater has reacted fully in the reactor for 1 to 2 hours, the drain port 243 can be opened to discharge the treated wastewater to the subsequent treatment unit. After the wastewater is emptied, the electrolysis system can enter the next water inlet treatment cycle. To shut down the electrolysis system, the first thing to turn off is the switch of the electrolysis power supply and the power supply of the UV lamp tube 221 to ensure the safety of the equipment. Then, close the water inlet pipe 110, and finally close the air inlet 231.

[0068] If the system needs to be shut down for a long time, then it is necessary to turn off or unplug the main power supply of the electrolysis power supply. This is to ensure that no accidents occur during the long-term shutdown of the equipment and also to protect the equipment and extend its service life. These steps are all to ensure the safety and normal operation of the equipment and also to protect the personal safety of the operators.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photoelectrocatalytic oxidation device, characterized in that: The invention comprises an upper tank body (100) and a lower tank body (200); the upper tank body (100) and the lower tank body (200) are detachably connected, and a receiving space (300) is provided in the hollow interior of the upper tank body (100) and the lower tank body (200); a water inlet pipe (110) and a feed pipe (120) are provided at the top of the upper tank body (100); A first mounting plate (210) and a second mounting plate (220) are provided in the upper tank body (100); the first mounting plate (210) and the second mounting plate (220) are arranged at a certain interval; the first mounting plate (210) and the second mounting plate (220) are in communication with the accommodating space (300); A first electrode plate (211) and a second electrode plate (212) are provided on the first mounting plate (210); at least two lamp tubes are provided on the second mounting plate (220); the first electrode plate (211), the second electrode plate (212) and the lamp tubes are all extended from the upper tank body (100) in the direction of the lower tank body (200); the first electrode plate (211) and the second electrode plate (212) are energized through the first mounting plate (210); and the lamp tubes are energized through the second mounting plate (220).

2. A photoelectrocatalytic oxidation device according to claim 1, characterized in that: The first electrode plate (211) is configured as an anode (213); and the second electrode plate (212) is configured as a cathode (214).

3. A photoelectrocatalytic oxidation device according to claim 1, characterized in that: The lamp tube is a UV lamp tube (221).

4. A photoelectrocatalytic oxidation device according to claim 3, characterized in that: A filter residue cavity (230) and a drainage cavity (240) are provided in the lower tank body (200); a filter residue plate (232) is provided between the filter residue cavity (230) and the drainage cavity (240); a filter membrane and a filter element are provided on the filter residue plate (232); the filter membrane covers the filter element; and a through hole is provided on the filter element.

5. A photoelectrocatalytic oxidation device according to claim 4, characterized in that: The lower tank body (200) is provided with an air inlet (231); the setting height of the air inlet (231) is consistent with the setting height of the filter residue plate (232).

6. A photoelectrocatalytic oxidation device according to claim 4, characterized in that: The filter residue chamber (230) and the drainage chamber (240) are respectively provided with a filter residue outlet (233) and a drainage outlet (243).

7. The photoelectrocatalytic oxidation device according to claim 1, characterized in that: The pipe opening of the feed pipe (120) is provided with a first valve; the bottom of the lower tank body (200) is provided with a valve opening (241) connected via a flange; the valve opening (241) is closed by a second valve (242).

8. The photoelectrocatalytic oxidation device according to claim 1, characterized in that: An expansion joint (400) is provided at the connection between the upper tank body (100) and the lower tank body (200), and the expansion joint (400) fixes the connection between the upper tank body (100) and the lower tank body (200).

9. The photoelectrocatalytic oxidation device according to claim 4, characterized in that: The UV lamp tube (221) is extended to be arranged at the top of the filter residue chamber (230); and the first electrode plate (211) and the second electrode plate (212) are extended to be arranged at the bottom of the filter residue chamber (230).

10. The photoelectrocatalytic oxidation device according to claim 1, characterized in that: A first mounting portion (251) and a second mounting portion (252) are provided on the outside of the lower tank body (200); the lower tank body (200) is fixed by means of the first mounting portion (251) and the second mounting portion (252).

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