Wastewater treatment device for photocatalytic degradation of organic pollutants

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly discloses a wastewater treatment device for photocatalytic degradation of organic pollutants, which comprises a primary treatment tank, a secondary treatment tank and a secondary treatment tank, a first inner cavity for storing wastewater is formed in the primary treatment tank, and the primary treatment tank comprises a stirring paddle moving in the first inner cavity; the primary treatment tank further comprises a first water outlet pipe communicated with the first inner cavity; the aeration parts are mounted on the primary treatment ponds; a plurality of aeration holes are formed in the aeration part; a second water inlet pipe and a second water outlet pipe are formed on the secondary treatment tank, and the second water inlet pipe is communicated with the first water outlet pipe; the photocatalyst grating is mounted at the top of the primary treatment tank through a light-transmitting shell; a second inner cavity is formed in the light-transmitting shell, and the second inner cavity is communicated with the aeration hole; the device has the following advantages that the photocatalytic efficiency is effectively improved by adopting the photocatalyst grating, direct wastewater receiving is avoided, refractory organic matters are degraded, and secondary pollution is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and in particular, to a wastewater treatment device for photocatalytic degradation of organic pollutants. Background Art

[0002] Traditional sewage treatment technologies mainly rely on physical, chemical, and biological treatment methods. These methods include:

[0003] Physical methods: such as sedimentation, filtration, etc., which are used to remove suspended solids and large particulate matter in water.

[0004] Chemical methods: such as oxidation, flocculation, etc., which remove dissolved pollutants or change the properties of pollutants through chemical reactions for easy removal.

[0005] Biological treatment: Utilizing microorganisms to decompose organic substances, which is the most commonly used method for treating organic pollutants.

[0006] Although traditional methods are effective in many cases, there are still some obvious limitations: certain refractory organic substances or toxic compounds are difficult to be completely removed by traditional biological treatment, chemical treatment methods may introduce new pollutants or require the use of a large amount of chemical reagents, causing secondary pollution, high energy consumption and operating costs, especially in large treatment facilities that need to operate continuously.

[0007] In view of the limitations of traditional technologies, photocatalytic technology provides an efficient solution. Photocatalysis utilizes free radicals generated by photocatalysts (such as titanium dioxide) under the activation of light, which can effectively decompose organic pollutants in water, even refractory compounds. However, the application of photocatalytic technology also faces some challenges:

[0008] To achieve photocatalytic reactions, it is necessary to ensure sufficient contact between the photocatalyst and the wastewater. In practical applications, how to design the system to ensure this is a technical problem; the long-term use of photocatalysts in water bodies may reduce their activity due to the attachment of pollutants and changes in the chemical properties of the photocatalysts themselves.

[0009] Therefore, a wastewater treatment device for photocatalytic degradation of organic pollutants is proposed to solve the above-mentioned problems. Summary of the Utility Model

[0010] The utility model aims to provide a wastewater treatment device for photocatalytic degradation of organic pollutants to solve or improve at least one of the above technical problems.

[0011] In view of this, the first aspect of the utility model is to provide a wastewater treatment device for photocatalytic degradation of organic pollutants.

[0012] In the first aspect of the present utility model, a wastewater treatment device for photocatalytic degradation of organic pollutants is provided, including: a primary treatment tank, a plurality of which are provided and all obtain wastewater from a wastewater conveying network through a first water inlet pipe; a first inner cavity for storing the wastewater is formed inside the primary treatment tank, and the primary treatment tank includes a stirring paddle moving in the first inner cavity; the primary treatment tank further includes a first water outlet pipe communicating with the first inner cavity; an aeration part, installed on each primary treatment tank; a plurality of air holes are formed on the aeration part at the bottom of the first inner cavity; a secondary treatment tank, one of which is provided; a plurality of second water inlet pipes and a second water outlet pipe communicating with the inside thereof are formed on the secondary treatment tank, and the second water inlet pipe is communicated with the first water outlet pipe to convey the wastewater in the first inner cavity to the inside of the secondary treatment tank; a photocatalyst grille, installed on the top of the primary treatment tank through a light-transmitting housing; a second inner cavity is formed inside the light-transmitting housing, and the second inner cavity is communicated with the air holes to convey the purified gas treated by the photocatalyst grille in the second inner cavity to the first inner cavity.

[0013] In any of the above technical solutions, the aeration part further includes a purified gas channel, an air inlet channel, and a gas mixing channel, and the purified gas channel and the air inlet channel are respectively communicated with the gas mixing channel; the purified gas channel is communicated with the second inner cavity.

[0014] In any of the above technical solutions, the air inlet channel includes a cylindrical channel and a conical channel; the large-diameter end of the inner diameter of the conical channel is communicated with the cylindrical channel, and the small-diameter end of the inner diameter of the conical channel is communicated with the gas mixing channel.

[0015] In any of the above technical solutions, the purified gas channel is communicated with the gas mixing channel through a self-priming channel, and the self-priming channel corresponds to the small-diameter end of the inner diameter of the conical channel.

[0016] In any of the above technical solutions, the aeration part further includes an air inlet pipe, and the air inlet pipe is communicated with the cylindrical channel.

[0017] In any of the above technical solutions, a filter screen is provided at the connection between the air inlet pipe and the cylindrical channel.

[0018] In any of the above technical solutions, the aeration part further includes a guide pipe and an aeration disc installed at the bottom of the first inner cavity; the air holes are opened on the aeration disc and are communicated with the inner cavity of the aeration disc; the guide pipe axially penetrates through the stirring paddle; the lower port of the guide pipe is communicated with the inner cavity of the aeration disc, and the upper port of the guide pipe is communicated with the gas mixing channel.

[0019] In any of the above technical solutions, a drainage part is installed on each of the primary treatment tanks, and the first water outlet pipe is communicated with the first inner cavity through the drainage part.

[0020] In any of the above technical solutions, the drainage part includes a drain pipe and a multi-stage filter bucket. One end of the drain pipe is communicated with the top inner cavity of the multi-stage filter bucket, and the other end of the drain pipe extends to the top of the first inner cavity; the first water outlet pipe is communicated with the bottom inner cavity of the multi-stage filter bucket.

[0021] In any of the above technical solutions, a water filter screen is installed in the bottom inner cavity of the multi-stage filter bucket.

[0022] The beneficial effects of the present utility model compared with the prior art are as follows:

[0023] The photocatalyst grid is installed in the light-transmitting housing, which avoids the photocatalyst being directly immersed in water for a long time and reduces the decrease in photocatalyst activity caused by the attachment of pollutants. The light-transmitting housing ensures that the photocatalyst can receive sufficient light without directly contacting the water, solving the problems of stability and effectiveness when the photocatalyst is used in water. By delivering the purified gas after photocatalyst treatment to the wastewater through the second inner cavity and the air holes, it ensures that the gas purified by the photocatalyst can effectively mix with the wastewater, improving the treatment efficiency.

[0024] The use of the photocatalyst grid optimizes the photocatalytic process. By configuring the light-transmitting housing, the photocatalyst can make full use of natural light or artificial light sources to enhance the photocatalytic effect, thereby more effectively decomposing organic pollutants in the wastewater. It effectively decomposes organic substances that are difficult to biodegrade, reduces the treatment problems that may be encountered in traditional biological treatment, and improves the broad-spectrum and efficiency of wastewater treatment. The photocatalytic technology is a green treatment technology and does not produce secondary pollution. Using the photocatalyst to degrade organic substances reduces the use of chemical reagents and avoids the harmful by-products that may be generated during the chemical treatment process.

[0025] The additional aspects and advantages of the embodiments according to the present utility model will become apparent in the following description part, or will be understood through the practice of the embodiments according to the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0027] Figure 1 is a schematic structural diagram of the present utility model;

[0028] Figure 2 is a schematic structural diagram of the secondary treatment tank of the present utility model;

[0029] Figure 3Schematic diagram of the primary treatment tank structure of the present utility model;

[0030] Figure 4 Schematic diagram of the aeration part structure of the present utility model.

[0031] Among them, Figures 1-4 The corresponding relationship between the reference numerals and the component names in the drawings is as follows:

[0032] 1 Secondary treatment tank, 101 Second water inlet pipe, 102 Second water outlet pipe, 103 Feeding port, 2 Primary treatment tank, 201 First water outlet pipe, 202 First inner cavity, 203 Stirring paddle, 204 First water inlet pipe, 3 Photocatalyst grid, 301 Translucent housing, 302 Second inner cavity, 4 Aeration part, 401 Aeration holes, 402 Columnar channel, 403 Conical channel, 404 Purified gas channel, 405 Self-priming channel, 406 Gas mixing channel, 407 Air duct, 408 Aeration disc, 409 Air inlet pipe, 410 Air filter screen, 5 Drainage part, 501 Drain pipe, 502 Multi-stage water filter bucket, 503 Water filter screen. Specific embodiments

[0033] In order to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the present utility model will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0034] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present utility model is not limited by the specific embodiments disclosed below.

[0035] Please refer to Figures 1-4 , and a photocatalytic degradation of organic pollutant wastewater treatment device according to some embodiments of the present utility model will be described below.

[0036] An embodiment of the first aspect of the present utility model provides a photocatalytic degradation of organic pollutant wastewater treatment device. In some embodiments of the present utility model, as Figures 1-4 shown, the photocatalytic degradation of organic pollutant wastewater treatment device includes:

[0037] A plurality of primary treatment tanks 2, all of which obtain wastewater from the wastewater transmission network through the first water inlet pipe 204; a first inner cavity 202 for storing wastewater is formed inside the primary treatment tank 2, and the primary treatment tank 2 includes a stirring paddle 203 moving in the first inner cavity 202; the primary treatment tank 2 further includes a first water outlet pipe 201 communicating with the first inner cavity 202.

[0038] The aeration part 4 is installed on each primary treatment tank 2; a plurality of aeration holes 401 located at the bottom of the first inner cavity 202 are formed on the aeration part 4.

[0039] One secondary treatment tank 1 is provided; a plurality of second inlet pipes 101 and one second outlet pipe 102 communicating with the inside thereof are formed on the secondary treatment tank 1, and the second inlet pipes 101 are communicated with the first outlet pipe 201 to convey the wastewater in the first inner cavity 202 to the inside of the secondary treatment tank 1.

[0040] The photocatalyst grille 3 is installed on the top of the primary treatment tank 2 through a light-transmitting housing 301; a second inner cavity 302 is provided inside the light-transmitting housing 301, and the second inner cavity 302 is communicated with the aeration holes 401 to convey the purified gas treated by the photocatalyst grille 3 in the second inner cavity 302 to the first inner cavity 202.

[0041] A wastewater treatment device for photocatalytic degradation of organic pollutants provided by the present utility model, the primary treatment tank 2 is used for preliminarily collecting and treating the incoming wastewater. The purpose of this tank is to remove larger particle impurities in the wastewater through physical methods (such as sedimentation and stirring) to prepare for the next photocatalytic treatment. Each primary treatment tank 2 obtains wastewater from the wastewater conveying pipeline network through the first inlet pipe 204. A first inner cavity 202 for storing wastewater and a stirring paddle 203 for maintaining the fluidity of the wastewater and avoiding the deposition of waste are provided in the tank; the treated wastewater flows out through the first outlet pipe 201 communicating with the first inner cavity 202 and is transferred to the next treatment stage.

[0042] The wastewater first flows into the primary treatment tank 2 through the first inlet pipe 204. At this stage, the stirring paddle 203 keeps the water body dynamic, which helps the sedimentation of larger particles and the separation of impurities. Stirring is also beneficial to evenly distribute the pollutant concentration in the wastewater, making the photocatalytic reaction more efficient; the pretreated wastewater flows into the photocatalytic reaction tank (if any) through the first outlet pipe 201. In the photocatalytic reaction tank, the wastewater contacts a photocatalyst (such as titanium dioxide), and under the irradiation of ultraviolet light or visible light, active oxidants such as hydroxyl radicals generated by the photocatalyst can effectively decompose the organic pollutants in the water; the wastewater treated by the photocatalytic reaction can flow out through the outlet pipe and can be further treated or discharged as needed.

[0043] The aeration part 4 is installed on the top or side of each primary treatment tank 2 to facilitate providing necessary oxygen for the microorganisms in the water. The aeration part 4 includes one or more aeration devices, and these devices are connected to the bottom of the first inner cavity 202 of the primary treatment tank 2 through an aeration pipeline; located at the bottom of the first inner cavity 202, usually there are a plurality of small holes or a series of evenly distributed openings for evenly releasing bubbles.

[0044] The aeration section 4 compresses air and releases it into the wastewater in the primary treatment tank 2 through the aeration holes 401. During this process, the air is broken down into countless small bubbles. As the bubbles rise, oxygen gradually dissolves in the water. During the wastewater treatment process, the metabolic activities of microorganisms have a relatively high demand for oxygen. The dissolved oxygen provided by aeration not only supports the growth and reproduction of aerobic microorganisms but also promotes the decomposition of organic matter during their metabolic processes. The rising of bubbles during aeration also helps to stir the water body, increasing the mass exchange between different parts of the water and making pollutants more evenly exposed to microorganisms and photocatalysts, thus improving the treatment efficiency. In the photocatalytic treatment stage, the increased dissolved oxygen can improve the oxidation ability of the photocatalyst because some photocatalytic reactions may rely on sufficient oxygen to generate effective oxidants (such as hydroxyl radicals). Aeration not only improves the efficiency of biological treatment but also creates a more favorable chemical environment for subsequent photocatalytic reactions, ultimately achieving more thorough degradation of organic pollutants.

[0045] There is usually one secondary treatment tank 1, which is responsible for further purifying the preliminarily treated wastewater. The secondary treatment tank 1 is equipped with one or more second inlet pipes 101 and one second outlet pipe 102. These pipes ensure the flow direction of the wastewater and the continuity of the treatment. Each second inlet pipe 101 is directly connected to the first outlet pipe 201 of the primary treatment tank 2 to transport the wastewater treated in the primary treatment tank 2 to the secondary treatment tank 1. The second outlet pipe 102 is used to discharge the treated wastewater in the secondary treatment tank 1 and transport it to the next treatment facility or directly for discharge.

[0046] The wastewater passing through the primary treatment tank 2 contains less suspended solids and preliminarily degraded organic matter and is transported to the secondary treatment tank 1 through the second inlet pipe 101. This design ensures the continuity of the treatment process. The wastewater has undergone preliminary physical and possibly biological treatment before entering the secondary treatment tank 1. The secondary treatment tank 1 usually incorporates more specialized treatment technologies, such as biological treatment, chemical treatment, or more advanced photocatalytic technology. At this stage, the wastewater may come into contact with different biological cultures, such as activated sludge, or use chemical additives to further degrade harmful chemical substances. If photocatalytic technology is adopted, additional light sources and photocatalysts can be installed to enhance the degradation ability of organic matter, especially for refractory organic pollutants. After sufficient secondary treatment, the wastewater is discharged through the second outlet pipe 102. At this time, the water quality should be significantly improved to meet more stringent discharge standards or for recycling. After discharge, it can enter a tertiary treatment facility for further refined treatment, such as decolorization, desalination, disinfection, etc., according to needs.

[0047] The photocatalyst grid 3 is installed on the top of the primary treatment tank 2 and fixed by the light-transmitting housing 301. Under the activation of light, the photocatalyst (such as titanium dioxide) decomposes organic pollutants or malodorous gases in the gas in the tank. The light-transmitting housing 301 has a certain transparency to enable light energy to effectively penetrate and activate the photocatalyst in the photocatalyst grid 3. It is provided with a second inner cavity 302 which is specifically used to treat the gas passing through the photocatalyst grid 3. The second inner cavity 302 is communicated with the aeration holes 401, and this design enables the treated gas to be transported to the first inner cavity 202 to further increase the solubility of oxygen in the wastewater.

[0048] The photocatalyst grid 3 is activated by the irradiation of sunlight or artificial light sources (such as UV lamps) under the protection and support of the light-transmitting housing 301. The photocatalyst (usually titanium dioxide) generates free radicals such as hydroxyl radicals and superoxide anions under the action of light. These free radicals have a high oxidation ability and can decompose organic pollutants and odor molecules in the air. During the treatment process, the gas rising from the primary treatment tank 2 enters the second inner cavity 302 of the light-transmitting housing 301 and is purified by passing through the photocatalyst grid 3. The purified gas contains more clean oxygen and a small amount of carbon dioxide. The purified gas is guided back to the first inner cavity 202 through the communication channel with the aeration holes 401, which not only increases the oxygen content in the water but also promotes the removal of harmful gases. The photocatalyst treatment not only removes the malodor and harmful gases in the wastewater but also enhances the oxidation environment of the water body through the circulating purified gas, which is extremely beneficial to the growth of aerobic microorganisms and the biodegradation of organic pollutants. This design effectively utilizes solar energy or other light sources, reduces the demand for additional energy, and simultaneously improves the overall environmental protection and economic benefits of the system.

[0049] In summary, through the design of the primary and secondary treatment tanks 1, the wastewater is allowed to undergo multi-stage treatment, gradually improving the water quality and effectively decomposing and removing organic pollutants. The use of the photocatalyst grid 3 enhances the degradation ability of organic pollutants, especially when dealing with refractory or toxic organic compounds. Using photocatalysts (such as titanium dioxide) to treat pollutants does not rely on chemical agents, reducing the possible secondary pollution during the chemical treatment process. By utilizing natural light or low-energy artificial light sources to activate the photocatalyst, energy consumption is saved. The design of the aeration section 4 provides sufficient oxygen supply, improves the redox environment in the tank, promotes the activities of aerobic microorganisms, increases the biological treatment efficiency, and the purified gas treated by the photocatalyst grid 3 is transported back to the wastewater, further improving the water quality and reducing the emission of malodor and harmful gases.

[0050] Specifically, a plurality of feeding ports 103 communicated with the inner cavity are further arranged on the secondary treatment tank 1 for the input of water purification reagents.

[0051] As described above, the feeding port allows operators or automated systems to directly introduce specific purified water reagents into the secondary treatment tank. These reagents may include flocculants, pH regulators, disinfectants, or other chemicals, which are used to optimize the effect of wastewater treatment, such as improving sedimentation, adjusting the pH, enhancing the efficiency of microbial treatment, or killing pathogens.

[0052] In any of the above embodiments, the aeration part 4 further includes a purified gas channel 404, an intake channel, and a gas mixing channel 406. The purified gas channel 404 and the intake channel are respectively connected to the gas mixing channel 406.

[0053] The purified gas channel 404 is connected to the second inner cavity 302.

[0054] In this embodiment, the purified gas treated by the photocatalyst grille 3 is transported from the second inner cavity 302 of the light-transmitting housing 301 to the gas mixing channel 406. The connection between the second inner cavity 302 and the gas mixing channel 406 ensures that the gas treated by the photocatalyst can be effectively utilized. The intake channel provides external air to support the oxidation demand during the wastewater treatment process. Usually, air is introduced from the external environment and connected to the gas mixing channel 406. The gas mixing channel 406 mixes the purified gas from the purified gas channel 404 and the fresh air introduced by the intake channel, and then transports the mixed gas to the primary treatment tank 2. As the central node connecting the purified gas channel 404 and the intake channel, it is responsible for the uniform distribution of the mixed gas.

[0055] The photocatalyst grille 3 is activated in the second inner cavity 302 of the light-transmitting housing 301 to treat the gas rising from the primary treatment tank 2, such as volatile organic compounds (VOCs) and malodorous gases. The treated purified gas is transported to the gas mixing channel 406 through the purified gas channel 404. The intake channel introduces fresh air from the outside to provide the necessary oxygen to support the aerobic biological treatment process. In the gas mixing channel 406, the external air is mixed with the purified gas, ensuring sufficient supply of oxygen in the treatment tank and an appropriate balance of gas components. The mixed gas is transported to the bottom of the primary treatment tank 2 through the air holes 401 of the aeration part 4, providing a good oxidation environment and promoting the biological and photocatalytic degradation of organic matter in the wastewater. This recycling of gas not only improves the efficiency of the system but also reduces energy consumption and operating costs.

[0056] In any of the above embodiments, the intake channel includes a cylindrical channel 402 and a conical channel 403. The large-diameter end of the inner diameter of the conical channel 403 is connected to the cylindrical channel 402, and the small-diameter end of the inner diameter of the conical channel 403 is connected to the gas mixing channel 406.

[0057] In this embodiment, the cylindrical channel 402 serves as the main part for air intake, responsible for introducing external air into the system. It is straight and cylindrical, which helps to improve the stability and efficiency of air flow. The conical channel 403 connects the cylindrical channel 402 and the gas mixing channel 406, optimizing the air flow direction and pressure distribution. It is conical, with an inner diameter decreasing from large to small. The large end is connected to the cylindrical channel 402, and the small end is connected to the gas mixing channel 406.

[0058] Air first enters the system through the cylindrical channel 402, which provides a direct path and is conducive to the stable inflow of air. When the air enters the conical channel 403, due to the gradual decrease in the inner diameter of the channel, the air flow rate gradually increases. This design utilizes the principle of fluid dynamics, that is, the decrease in the channel area will lead to an increase in the flow velocity (Bernoulli's principle). The design of the conical channel 403 not only speeds up the air flow rate but also helps to adjust the gas pressure and velocity entering the gas mixing channel 406, enabling the air to reach appropriate dynamic conditions before entering the gas mixing channel 406. Such air dynamics helps to better mix with the purified gas in the gas mixing channel 406, enhancing the mixing effect and uniformity. The air processed by the conical channel 403 is mixed with the purified gas in the gas mixing channel 406. Due to the dynamic adjustment at the air inlet, the uniform distribution of the mixed gas and the oxygen supply efficiency are optimized. The increased flow rate and adjusted pressure help the gas to be more quickly and evenly distributed to the aeration holes 401 in the gas mixing channel 406 and finally delivered to the primary treatment tank 2.

[0059] In any of the above embodiments, the purified gas channel 404 is connected to the gas mixing channel 406 through the self - suction channel 405, and the self - suction channel 405 corresponds to the small - diameter end of the inner diameter of the conical channel 403.

[0060] In this embodiment, the purified gas channel 404 conveys the purified gas processed by the photocatalyst grid 3 and is connected to the gas mixing channel 406 through the self - suction channel 405. The self - suction channel 405 utilizes the principle of fluid dynamics to achieve the effective transportation and mixing of the purified gas, connecting the purified gas channel 404 and the gas mixing channel 406, corresponding to the small - diameter end of the inner diameter of the conical channel 403. The gas mixing channel 406 mixes the externally introduced air and the processed purified gas, optimizing the gas distribution and supply.

[0061] The design of the self - suction channel 405 is based on the "self - suction effect" in fluid dynamics, which is a mechanism that uses the pressure difference generated by fluid flow to guide the flow of another fluid. When the external air accelerates into the gas - mixing channel 406 through the conical channel 403, the high - speed air flow generated at the small - end inner diameter of the conical channel 403 reduces the local air pressure, thus creating a negative - pressure area. Under the action of the self - suction channel 405, the purified gas after being treated by the photocatalyst grille 3 is attracted by the negative - pressure area and enters the gas - mixing channel 406 from the purified - gas channel 404. This self - suction effect enables the purified gas to flow without the need for an additional pump or fan, saving energy and reducing the complexity and maintenance cost of the system. In the gas - mixing channel 406, the purified gas from the self - suction channel 405 is mixed with the external air to form a uniform gas mixture. This mixed gas is evenly distributed into the primary treatment tank 2 through the air - diffusing holes 401, providing the necessary oxygen and promoting the further degradation of organic pollutants. Through the design of the self - suction channel 405, the system utilizes natural physical phenomena to enhance the efficiency of gas transportation and mixing, thereby optimizing the supply of oxygen and the treatment of organic pollutants in the entire wastewater treatment process.

[0062] In any of the above - mentioned embodiments, the aeration part 4 further includes an air inlet pipe 409, and the air inlet pipe 409 is communicated with the cylindrical channel 402.

[0063] In this embodiment, the air inlet pipe 409 introduces external air into the aeration system and is directly connected to the cylindrical channel 402 to form the main inlet of air. The cylindrical channel 402 stably transports the air delivered by the air inlet pipe 409 to the conical channel 403, serving as the direct path for the air to flow into the conical channel 403 and ensuring the continuity and stability of air flow.

[0064] The air inlet 409 serves as the air inlet of the system, and introduces necessary air from the outside to support the oxidation reaction and microbial activity in the wastewater treatment process. Since the air inlet 409 is directly connected to the cylindrical channel 402, it provides an unobstructed channel so that the air can flow directly and stably into the cylindrical channel 402; the air maintains a relatively stable flow rate and pressure when passing through the cylindrical channel 402, preparing for the subsequent speed increase and pressure adjustment in the conical channel 403. The cylindrical channel 402 ensures that the air introduced by the air inlet 409 is not disturbed before flowing to the conical channel 403, thereby reducing the energy loss in the flow; when the air Flowing through the tapered channel 403, due to its design (the inner diameter gradually decreases), the air velocity increases, thereby forming a higher dynamic pressure before entering the mixing channel 406. This change in pressure and velocity is conducive to effective mixing with the purified gas in the mixing channel 406, ensuring that the mixed gas is evenly distributed to the primary treatment tank 2 through the aeration holes 401; the air inlet pipe 409 in the system design optimizes the air supply and ensures sufficient oxygen supply, which is crucial for the biodegradation and photocatalytic treatment of organic matter in wastewater. The effective gas management of the entire aeration system reduces energy consumption and operating costs, while also increasing the environmental friendliness of the system.

[0065] In any of the above embodiments, an air filter 410 is provided at the connection point between the air inlet pipe 409 and the cylindrical channel 402 .

[0066] In this embodiment, the air filter 410 filters dust, particulate matter and other suspended matter in the incoming air, and is installed at the connection point between the air inlet pipe 409 and the cylindrical channel 402, and is the last checkpoint before the air enters the system.

[0067] The main function of the air filter 410 is to intercept and filter solid particles, dust and other suspended matter in the air. This can prevent these substances from entering the system, reduce wear and clogging of the equipment, especially for particles that may affect the function of sensors or other precision components. By keeping the air flowing in pure, the air filter 410 also helps maintain the cleanliness of the internal environment of the system, which helps to reduce the frequency and cost of maintenance; the air filter 410 protects the cleanliness of key components such as the columnar channel 402, the conical channel 403 and the gas mixing channel 406 by preventing the entry of larger particles and impurities. This protective effect is particularly important for maintaining the efficiency of the gas flow rate and pressure regulating device, and is important for the long-term operation and reliability of the system, especially when dealing with more complex or more suspended particles in the environment; although the air filter 410 prevents the entry of impurities, it must be designed to minimize its resistance to air flow to avoid affecting the overall efficiency of the system. Good air quality helps to maintain the uniformity of gas mixing, which is important for the effective use of gas in the aeration system and the efficiency of wastewater treatment.

[0068] In any of the above embodiments, the aeration part 4 further includes an air duct 407 and an aeration disc 408 installed at the bottom of the first inner cavity 202; the air holes 401 are opened on the aeration disc 408 and communicate with the inner cavity of the aeration disc 408.

[0069] The air duct 407 axially penetrates through the stirring paddle 203; the lower port of the air duct 407 communicates with the inner cavity of the aeration disc 408, and the upper port of the air duct 407 communicates with the air mixing channel 406.

[0070] In this embodiment, the air duct 407 conveys the mixed gas to the aeration disc 408, axially penetrates through the stirring paddle 203, the upper port is connected to the air mixing channel 406, and the lower port is connected to the inner cavity of the aeration disc 408; the aeration disc 408 evenly distributes the gas to the bottom of the primary treatment tank 2, is installed at the bottom of the first inner cavity 202, and has a plurality of air holes 401, which are directly connected to the inner cavity of the aeration disc 408, enabling the gas to be evenly released into the water.

[0071] The mixed gas enters the upper port of the air duct 407 through the air mixing channel 406. The air duct 407 is designed to be arranged along the axial direction of the stirring paddle 203, which can maximize the use of space and reduce the interference with the water flow dynamics. The air duct 407 directly conveys the gas to the aeration disc 408, ensuring that the pressure and flow rate during the gas conveyance are maintained, and improving the conveyance efficiency; the aeration disc 408 is located at the bottom of the primary treatment tank 2 and is designed with a plurality of air holes 401, and the structures of these holes are optimized to promote the even distribution of the gas in the water. When the gas is released from the air duct 407 into the water through the aeration disc 408, the design of the air holes 401 enables the gas to be dispersed in the form of fine bubbles, increasing the contact area between the bubbles and the water, and improving the dissolution rate and utilization efficiency of oxygen; the release of the gas not only provides the necessary oxygen to support the biodegradation process, but also enhances the stirring of the water body through the generated microbubbles. This stirring helps to prevent the deposition of solid substances and promotes the contact between pollutants and microorganisms. The movement of the stirring paddle 203 combined with the gas release of the aeration disc 408 ensures the efficiency and uniformity of the wastewater treatment, especially when treating high-concentration organic pollutants.

[0072] In any of the above embodiments, a drainage part 5 is installed on each primary treatment tank 2, and the first water outlet pipe 201 is connected to the first inner cavity 202 through the drainage part 5.

[0073] In this embodiment, the drainage part 5 controls and manages the flow direction of the water discharged from the primary treatment tank 2. The drainage part 5 is directly connected to the first inner cavity 202 and conveys the treated wastewater to the secondary treatment tank 1 or other treatment facilities through the first water outlet pipe 201.

[0074] The drainage section 5 generally includes valves or other control devices that can adjust the rate and duration of water discharge according to treatment requirements. By precisely controlling the water discharge, it can ensure that the residence time of the wastewater in the primary treatment tank 2 is sufficient to complete necessary treatment steps such as sedimentation, agitation, aeration, etc. In addition, the design of the drainage section 5 also allows for the complete or partial closure of the water discharge when needed, facilitating in-tank maintenance or the evaluation of treatment effects; in some designs, the drainage section 5 may also include a filtration system such as a grid or sieve to intercept larger particles or other residues generated during the treatment process, preventing these substances from entering the next treatment stage, which helps protect subsequent facilities from damage and improves the efficiency and safety of the entire treatment system. The filtration function also helps remove large particulate organic matter or other residues that may not have been completely decomposed during primary treatment, ensuring that the quality of the discharged water meets the requirements for entering the secondary treatment tank 1; the effective operation of the drainage section 5 is crucial for ensuring the treatment effect of the primary treatment tank 2. By adjusting the drainage rate and pattern, the balance of chemical and biological processes in the treatment tank can be optimized. For example, increasing the residence time can improve the efficiency of biodegradation, while rapid drainage may be suitable for high-flow but low-pollution-concentration situations. Proper water flow management also helps prevent the formation of anaerobic conditions in the tank, which is particularly important in applications where an aerobic state needs to be maintained to promote biodegradation and photocatalytic reactions.

[0075] In any of the above embodiments, the drainage section 5 includes a drain pipe 501 and a multi-stage filter bucket 502. One end of the drain pipe 501 is connected to the top inner cavity of the multi-stage filter bucket 502, and the other end of the drain pipe 501 extends to the top of the first inner cavity 202.

[0076] The first water outlet pipe 201 is connected to the bottom inner cavity of the multi-stage filter bucket 502.

[0077] In this embodiment, the drain pipe 501 leads out the preliminarily treated wastewater from the top of the primary treatment tank 2, with one end connected to the top inner cavity of the multi-stage filter bucket 502 and the other end extending to the top of the first inner cavity 202, responsible for transporting the wastewater to the filter bucket for further filtration; the multi-stage filter bucket 502 further removes suspended solids, particles, and other impurities in the wastewater through a multi-stage filtration system. The barrel body is divided into multiple filtration sections, and each section uses filtration media with different particle sizes for hierarchical filtration from coarse to fine. The bottom inner cavity is connected to the first water outlet pipe 201, which is used to transport the filtered water to the secondary treatment tank 1 or for discharge.

[0078] When the wastewater is transported from the primary treatment tank 2 to the multi-stage filter bucket 502 through the drain pipe 501, the water flow first enters the top inner cavity of the bucket. At this stage, larger suspended solids or particles can be initially intercepted, reducing the burden on the next filtration layer; the wastewater passes downward through multiple filtration layers, each layer using filtration materials with different particle sizes, such as sand, activated carbon, fine mesh, etc. This filtration setup from coarse to fine ensures efficient particle removal. Each filtration section is specifically designed to remove impurities of a specific size, effectively improving the overall filtration efficiency and ensuring that the water quality gradually reaches a higher cleanliness standard; the wastewater after multi-stage filtration is collected in the bottom inner cavity of the filter bucket. The water here has significantly removed suspended solids and particles, and the water quality has been significantly improved. Finally, the clean water is transported through the first outlet pipe 201 at the bottom to the secondary treatment tank 1 for further treatment or directly discharged; the multi-stage filter bucket 502 is designed to facilitate regular cleaning and replacement of the filtration materials, ensuring the continuity of the filtration effect and the stable operation of the system. Proper maintenance and operation can extend the service life of the filter materials and prevent system overload.

[0079] In any of the above embodiments, a water filter net 503 is installed in the bottom inner cavity of the multi-stage filter bucket 502.

[0080] In this embodiment, the water filter net 503 is the final-stage filtration, preventing fine particles, impurities, or residual suspended solids from flowing out with the water. It is installed in the bottom inner cavity of the multi-stage filter bucket 502, at the bottom of all filtration layers.

[0081] The water filter net 503 serves as the last line of defense, ensuring that the water that has passed through each filtration layer above it does not contain fine particles or impurities that are sufficient to affect the next treatment step or emission standard. The grid is designed finely enough to capture the smallest particles while allowing the water to flow unobstructed, avoiding excessive water flow resistance and thus not significantly increasing the pressure through the filter bucket; through this additional water filter net 503, the cleanliness of the treated water can be greatly improved, providing additional guarantee for water quality safety. Especially before the water is used in sensitive environments or for further fine treatment (such as reverse osmosis, ultraviolet disinfection, etc.), this meticulous filtration mechanism also helps to protect the pipelines and equipment of downstream treatment facilities, reducing maintenance costs and possible equipment damage; the water filter net 503 is designed to be easily accessible and cleaned, making regular maintenance and replacement simple. This is the key to maintaining the efficient operation and long-term stability of the system. Regular inspection and cleaning of the water filter net 503 can prevent blockage and decline in filtration efficiency, ensuring the continuity of water flow and the consistency of water quality.

[0082] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, 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.

[0083] The embodiments described above are only descriptions of the preferred modes of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A wastewater treatment device for photocatalytic degradation of organic pollutants, characterized in that: include: A plurality of primary treatment tanks are provided, and all of them obtain wastewater from the wastewater transport network through a first water inlet pipe; a first inner cavity for storing the wastewater is formed inside the primary treatment tank, and the primary treatment tank includes a stirring paddle moving in the first inner cavity; the primary treatment tank also includes a first water outlet pipe connected to the first inner cavity; an aeration unit installed on each of the primary treatment tanks; the aeration unit is formed with a plurality of aeration holes located at the bottom of the first inner cavity; A secondary treatment tank is provided; a plurality of second water inlet pipes and a second water outlet pipe are formed on the secondary treatment tank and are connected to the interior thereof; the second water inlet pipe is connected to the first water outlet pipe to transport the wastewater in the first inner cavity to the interior of the secondary treatment tank; The photocatalyst grid is installed on the top of the primary treatment tank through a light-transmitting shell; the light-transmitting shell has a second inner cavity, and the second inner cavity is connected to the aeration hole to transport the purified gas in the second inner cavity treated by the photocatalyst grid to the first inner cavity.

2. The device for treating wastewater by photocatalytic degradation of organic pollutants according to claim 1 is characterized in that: The aeration part further includes a purified gas channel, an air intake channel and an air mixing channel, and the purified gas channel and the air intake channel are respectively connected to the air mixing channel; The purified gas channel is communicated with the second inner cavity.

3. The device for treating wastewater by photocatalytic degradation of organic pollutants according to claim 2 is characterized in that: The air intake passage includes a cylindrical passage and a conical passage; the end with a large inner diameter of the conical passage is connected to the cylindrical passage, and the end with a small inner diameter of the conical passage is connected to the gas mixing passage.

4. The device for treating wastewater by photocatalytic degradation of organic pollutants according to claim 3 is characterized in that: The purified gas channel is connected to the mixed gas channel through a self-priming channel, and the self-priming channel corresponds to the small inner diameter end of the tapered channel.

5. The wastewater treatment device for photocatalytic degradation of organic pollutants according to claim 3 is characterized in that: The aeration part also includes an air inlet pipe, and the air inlet pipe is communicated with the columnar channel.

6. The device for treating wastewater by photocatalytic degradation of organic pollutants according to claim 5 is characterized in that: An air filter is arranged at the connection point between the air inlet pipe and the cylindrical channel.

7. The wastewater treatment device for photocatalytic degradation of organic pollutants according to claim 2 is characterized in that: The aeration part further includes an air guide pipe and an aeration plate installed at the bottom of the first inner cavity; the aeration holes are provided on the aeration plate and communicate with the inner cavity of the aeration plate; The air guide pipe penetrates the stirring blade along the axial direction; the lower end of the air guide pipe is communicated with the inner cavity of the aeration plate, and the upper end of the air guide pipe is communicated with the gas mixing channel.

8. The device for treating wastewater by photocatalytic degradation of organic pollutants according to claim 1, characterized in that: A drainage part is installed on each of the primary treatment tanks, and the first water outlet pipe is connected with the first inner cavity through the drainage part.

9. The wastewater treatment device for photocatalytic degradation of organic pollutants according to claim 8 is characterized in that: The drainage part includes a drainage pipe and a multi-stage water filter bucket, one end of the drainage pipe is connected to the top inner cavity of the multi-stage water filter bucket, and the other end of the drainage pipe extends to the top of the first inner cavity; The first water outlet pipe is communicated with the bottom inner cavity of the multi-stage water filter barrel.

10. The wastewater treatment device for photocatalytic degradation of organic pollutants according to claim 9 is characterized in that: A water filter net is installed in the bottom inner cavity of the multi-stage water filter barrel.

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