A visible light catalytic wastewater treatment device

Abstract

This utility model discloses a visible light catalytic wastewater treatment device, relating to the field of wastewater treatment technology. It includes: a reaction vessel containing a photocatalyst for degrading organic matter in wastewater; a stirrer within the reaction vessel for mixing the wastewater and the visible light photocatalyst; an organic wastewater pipe connected to the reaction vessel; an industrial lamp located above the reaction vessel to provide visible light and activate the photocatalyst; and a suspension separator connected to the reaction vessel for separating the degraded suspension and returning the resulting solid-liquid mixture to the reaction vessel for recycling. This wastewater treatment device utilizes the visible light catalytic properties of a zinc tungstate and zinc molybdate composite material, solving the problems of low degradation efficiency and reliance on ultraviolet light in traditional technologies, thus reducing secondary pollution. Furthermore, the device adopts a modular component design, facilitating rapid disassembly, expansion, and maintenance, adapting to different scales of wastewater treatment needs.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a visible light catalytic degradation device utilizing a composite material of zinc tungstate (ZnWO4) and zinc molybdate (ZnMoO4), suitable for the treatment of industrial wastewater and wastewater containing recalcitrant organic pollutants. Background Technology

[0002] With rapid industrialization and urbanization, water pollution has become increasingly serious, especially industrial wastewater containing large amounts of recalcitrant organic compounds (such as dyes, phenols, and Rhodamine B). These substances are highly toxic, structurally complex, and difficult to treat using traditional biodegradation methods. Traditional wastewater treatment technologies (such as physical adsorption, chemical precipitation, and biodegradation) suffer from low efficiency, high cost, and the potential for secondary pollution when treating these recalcitrant organic compounds. Therefore, developing efficient and environmentally friendly wastewater treatment technologies has become an important issue in current environmental governance.

[0003] Photocatalysis, as an emerging advanced oxidation technology, boasts advantages such as high efficiency, environmental friendliness, and no secondary pollution, making it particularly suitable for treating recalcitrant organic pollutants. Photocatalysis utilizes photogenerated electrons and holes generated by semiconductor materials under light irradiation to decompose organic pollutants into harmless small molecules (such as CO2 and H2O) through redox reactions. Compared to traditional wastewater treatment methods, photocatalysis offers the following advantages: First, high-efficiency degradation: It can effectively degrade recalcitrant organic matter, especially dyes. Second, environmentally friendly and pollution-free: No harmful byproducts are produced during the reaction, meeting the requirements of green chemistry. Third, wide applicability: It can be used to treat various types of organic pollutants and is not limited by pollutant concentration. Fourth, energy utilization: It can utilize renewable energy sources such as solar energy as a light source, reducing energy consumption.

[0004] In photocatalysis, the selection and performance of the photocatalyst are key factors determining degradation efficiency. While traditional TiO2 photocatalysts possess good photocatalytic performance, their wide band gap limits their application to visible light, restricting their responsiveness only under ultraviolet light. To address these limitations, this invention proposes a photocatalytic device based on a narrow bandgap semiconductor material. By combining a composite photocatalyst with visible light response technology, it significantly improves wastewater treatment efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency and environmentally friendly wastewater treatment device that utilizes the visible light catalytic properties of zinc tungstate and zinc molybdate composite materials to solve the problems of low degradation efficiency and reliance on ultraviolet light in traditional technologies, and to reduce secondary pollution.

[0006] To achieve the above objectives, the wastewater treatment device of this utility model includes the following structure:

[0007] A reaction vessel containing a visible light catalyst for degrading organic matter in wastewater; the reaction vessel also contains a stirrer for mixing the wastewater with the visible light catalyst.

[0008] An organic wastewater pipeline, connected to the reaction vessel, is used to transport organic wastewater to the reaction vessel;

[0009] Industrial lamps, located above the reaction vessel, are used to provide a visible light source to activate the visible light catalyst.

[0010] The suspension separator, connected to the reaction vessel, is used to separate the degraded suspension and return the resulting solid-liquid mixture to the reaction vessel for reuse.

[0011] Furthermore, a support frame is provided above the reaction vessel. The support frame includes a bearing and multiple feet. A rotating shaft is fixedly sleeved inside the bearing. The bottom end of the rotating shaft is connected to a stirrer, and the top end of the rotating shaft is connected to a motor. Multiple feet are arranged in a circumferential array around the bearing. One end of each foot is fixed to the outside of the bearing, and the other end of each foot is provided with a foot seat. A groove is opened at the bottom of the foot seat, and the foot seat is fixed to the top of the reaction vessel through the bottom groove.

[0012] Furthermore, the motor side is provided with a bracket and a fixing plate. The bracket is connected to the fixing plate by a bolt assembly, and the bottom end of the fixing plate is fixedly connected to the foot support.

[0013] Preferably, the number of foot supports is 3 or 4.

[0014] Furthermore, the industrial lamp tube is mounted on the support.

[0015] Preferably, the photocatalyst is a narrow bandgap semiconductor material.

[0016] Preferably, the visible light catalyst is a tungstate and molybdate composite.

[0017] Preferably, the visible light source is a xenon lamp.

[0018] Furthermore, the wastewater treatment device also includes a first pipe and a second pipe; the suspension separator includes a separator body and an inlet located on the side of the separator body and an outlet at the bottom, the first pipe connects the reaction vessel to the inlet, and the second pipe connects the outlet to the reaction vessel.

[0019] Furthermore, the first pipeline is equipped with a solenoid valve. When the solenoid valve is opened, the suspension in the reaction vessel is automatically transported to the suspension separator under the action of gravity. The second pipeline is equipped with a slurry pump. When the slurry pump is started, the solid-liquid mixture at the bottom of the suspension separator can be returned to the reaction vessel for reuse.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] 1. Highly efficient degradation performance: The composite photocatalyst of tungstate and molybdate can rapidly decompose recalcitrant organic matter. Experiments show that the degradation rate of methylene blue (MB) reaches 81.47% within 2 hours of visible light irradiation, significantly higher than that of traditional TiO2 catalysts (degradation rate of less than 50% under ultraviolet light). The synergistic effect of the tungstate and molybdate composite material (such as efficient electron-hole separation) further enhances the photocatalytic reaction kinetics and shortens the wastewater treatment cycle.

[0022] 2. Visible light response and energy saving: The composite photocatalyst has a narrow band gap (about 2.8 eV) and can respond in the wavelength range of 400-700 nm, making full use of natural light or low-energy xenon lamps (simulating the solar spectrum), reducing dependence on ultraviolet light sources and saving energy costs.

[0023] 3. Modular design: The wastewater treatment unit adopts a modular component design, which facilitates quick disassembly, expansion and maintenance, and can adapt to wastewater treatment needs of different scales.

[0024] 4. Circulation system: The solid-liquid mixture at the bottom of the suspension separator is returned to the wastewater treatment plant for recycling through pipelines, reducing catalyst loss and improving resource utilization.

[0025] This invention's device can be widely applied in industrial wastewater treatment, urban sewage treatment, drinking water purification, and other fields, and is especially suitable for wastewater treatment containing recalcitrant organic matter. Through photocatalysis, it can effectively degrade toxic organic matter in wastewater, reduce environmental pollution, and promote the development of green and environmentally friendly technologies. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the device in this embodiment.

[0028] Figure 2This is a schematic diagram of the support frame in the device of this embodiment.

[0029] Explanation of icon numbers:

[0030] 1. Reaction vessel;

[0031] 2. Mixer;

[0032] 3. Visible light catalyst;

[0033] 4. Support legs; 41. Bearings; 42. Foot braces; 43. Rotating shafts; 44. Foot bases; 45. Grooves;

[0034] 5. Motor; 51. Bracket; 52. Mounting plate;

[0035] 6. Organic wastewater pipes;

[0036] 7. Industrial lamps;

[0037] 8. Suspension separator; 81. Separator body; 82. Inlet; 83. Outlet; 84. Discharge port;

[0038] 9. First pipeline;

[0039] 10. Second pipeline;

[0040] 11. Drainage pipes;

[0041] 12. Solenoid valve;

[0042] 13. Slurry pump.

[0043] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0045] Traditional wastewater treatment technologies (such as physical adsorption, chemical precipitation, and biodegradation) suffer from low efficiency, high cost, and a tendency to generate secondary pollution when treating recalcitrant organic matter. Furthermore, traditional photocatalysts, such as titanium dioxide (TiO2), have a wide band gap (approximately 3.2 eV) and can only respond to ultraviolet light, which accounts for less than 5% of natural light, limiting their practical application. To overcome this limitation... Figure 1As shown in the illustration, this application discloses a novel visible light catalytic degradation device, including a wastewater processor, an organic wastewater pipeline 6, an industrial lamp 7, a suspension separator 8, and a circulation pipeline. This device adopts a modular design for easy disassembly, maintenance, and expansion, and is suitable for wastewater treatment needs of different scales. The wastewater processor includes a reaction vessel 1, a stirrer 2 disposed within the reaction vessel 1, and a visible light catalyst 3 placed within the reaction vessel 1. The reaction vessel 1 is used to store wastewater, and the stirrer 2 is used to mix the wastewater with the visible light catalyst 3, ensuring sufficient contact between the visible light catalyst 3 and the pollutants, thereby improving degradation efficiency.

[0046] Combination Figure 2 As shown, the wastewater treatment unit also includes a support frame 4 located at the center of the top of the reaction vessel 1. The support frame 4 includes a bearing 41 and multiple supports 42. A rotating shaft 43 is fixedly sleeved inside the bearing 41. The bottom end of the rotating shaft 43 is connected to a stirrer 2, and the top end of the rotating shaft 43 is connected to a motor 5. The side of the motor 5 is provided with a bracket 51 and a fixing plate 52. The bracket 51 is connected to the fixing plate 52 by a bolt assembly, and the bottom end of the fixing plate 52 is fixedly connected to a support 42. Figure 1 As shown, multiple supports 42 are arranged in a circumferential array around the bearing 41, with the upper end of each support 42 fixedly connected to the outside of the bearing 41. Each support 42 has a base 44 at its lower end, and the base 44 has a groove 45 at its bottom. The base 44 is fixedly attached to the top of the reaction vessel 1 via the bottom groove 45. Therefore, in this embodiment, the stirrer 2 is assembled and disassembled using the support legs 4. Specifically, the number of supports 42 is preferably 3 or 4. Fewer than 3 support legs 4 would be unstable, while more than 4 support legs 4 would result in an overly complex structure.

[0047] In one example, the visible light catalyst 3 uses a narrow bandgap semiconductor material, such as a composite material of tungstate (ZnWO4) and molybdate (ZnMoO4). This material has a narrow bandgap and can respond to visible light, thereby greatly improving the photocatalytic efficiency. It is a novel visible light-responsive photocatalyst.

[0048] As an example of this application, the tungstate-molybdate composite was prepared by a hydrothermal method. The composite material prepared by this method exhibits highly efficient photocatalytic performance and has the following characteristics:

[0049] (1) Visible light response: The composite material can efficiently degrade organic pollutants under visible light, breaking through the limitation of traditional photocatalysts that only respond under ultraviolet light.

[0050] (2) High efficiency electron-hole separation: The composite structure of ZnWO4 and ZnMoO4 can effectively separate photogenerated electrons and holes, reduce the recombination rate, and thus improve photocatalytic activity.

[0051] (3) High degradation efficiency: Experiments show that the composite material can degrade methylene blue (MB) by 81.47% within 2 hours of visible light irradiation, which is significantly higher than the photocatalytic performance of the single material.

[0052] For example, the steps for preparing tungstate and molybdate complexes by hydrothermal method are as follows:

[0053] Weigh 1g of zinc nitrate hexahydrate into a beaker and dissolve it in 17g of water, labeling this solution A. Weigh 0.3g each of sodium tungstate and sodium molybdate into beakers and dissolve them in 22g of water with rapid stirring, labeling this solution B. Under continuous magnetic stirring, slowly add solution B dropwise to solution A. No precipitate forms during the addition. Adjust the pH of the solution to 6 with 1ml / L nitric acid solution. Then add 0.006g of hexadecyltrimethylammonium bromide and continue stirring for 3 hours. After thorough mixing, transfer the solution to a reaction vessel and place it in a constant-temperature drying oven at 180℃ for 12 hours. After the reaction, cool to room temperature and centrifuge to filter the solution. During centrifugation, wash the solution three times with deionized water and anhydrous ethanol to obtain a white precipitate. Dry the white precipitate in a constant-temperature oven. Grind the dried sample to obtain the tungstate-molybdate complex.

[0054] See you again Figure 1 As shown, the outlet end of the organic wastewater pipe 6 is connected to the reaction vessel 1, the inlet end of the organic wastewater pipe 6 is connected to the wastewater source, and a wastewater pump is installed on the organic wastewater pipe 6 to drive the transport of wastewater.

[0055] In this embodiment, the industrial lamp 7 is located above the reaction vessel 1 and is specifically installed and fixed on the foot support 42. The number of industrial lamps 7 can be set according to the number of foot supports 42. The industrial lamp 7 is used to provide a visible light source to stimulate the photocatalyst activity.

[0056] For example, a low-energy xenon lamp can be used as a visible light source to simulate natural lighting conditions for wastewater treatment in real-world environments.

[0057] Depend on Figure 1It is known that the suspension separator 8 is connected to the wastewater treatment unit and is used to separate the degraded suspension. Specifically, the suspension separator 8 includes a separator body 81, a spiral separation component located in the inner cavity of the separator body 81, an inlet 82 located on the side of the separator body 81, an outlet 83 located at the top of the separator body 81, and a discharge port 84 located at the bottom of the separator body 81. The circulation pipeline includes a first pipeline 9 and a second pipeline 10. The first pipeline 9 connects the reaction vessel 1 and the inlet 82. A solenoid valve 12 is installed on the first pipeline 9. When the solenoid valve 12 is opened, the suspension in the wastewater treatment unit is automatically transported to the separator under the action of gravity. The outlet 83 can be connected to the drainage pipeline 11 to discharge the clarified reclaimed water after separation. The second pipeline 10 connects the discharge port 84 and the reaction vessel 1. A slurry pump 13 is installed on the second pipeline 10. When the slurry pump 13 is started, the solid-liquid mixture at the bottom of the suspension separator 8 can be returned to the wastewater treatment unit for recycling.

[0058] The working principle of the visible light catalytic degradation device in this embodiment is as follows:

[0059] (1) Add the tungstate and molybdate composite material to the wastewater treatment plant at a rate of 1 g / L.

[0060] (2) Organic wastewater is injected into the wastewater treatment plant, and the stirrer 2 and industrial lamp 7 are turned on to degrade the wastewater in the reaction vessel 1.

[0061] (3) The wastewater suspension after degradation enters the suspension separator 8 through the first pipe 9 for separation. The separated reclaimed water is collected from the top of the suspension separator 8. The concentrated solid-liquid mixture is circulated to the wastewater processor through the second pipe 10 at the bottom for further reaction and use.

[0062] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0063] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0064] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A visible light catalytic wastewater treatment device, characterized by, Includes the following structure: A reaction vessel containing a visible light catalyst for degrading organic matter in wastewater; the reaction vessel also contains a stirrer for mixing the wastewater with the visible light catalyst. An organic wastewater pipeline, connected to the reaction vessel, is used to transport organic wastewater to the reaction vessel; Industrial lamps, located above the reaction vessel, are used to provide a visible light source to activate the visible light catalyst. The suspension separator, connected to the reaction vessel, is used to separate the degraded suspension and return the resulting solid-liquid mixture to the reaction vessel for reuse.

2. The device for wastewater treatment by photocatalysis with visible light according to claim 1, characterized in that, A support frame is provided above the reaction vessel. The support frame includes a bearing and multiple feet. A rotating shaft is fixedly sleeved inside the bearing. The bottom end of the rotating shaft is connected to a stirrer, and the top end of the rotating shaft is connected to a motor. Multiple feet are arranged in a circumferential array around the bearing. One end of each foot is fixed to the outside of the bearing, and the other end of each foot is provided with a foot seat. The bottom of the foot seat has a groove, and the foot seat is fixed to the top of the reaction vessel through the bottom groove.

3. The device for wastewater treatment by photocatalysis with visible light according to claim 2, characterized in that, The motor is provided with a bracket and a fixing plate on its side. The bracket is connected to the fixing plate by a bolt assembly, and the bottom end of the fixing plate is fixedly connected to the foot support.

4. The device for wastewater treatment by photocatalysis with visible light according to claim 2, characterized in that, The number of foot supports is 3 or 4.

5. The device for wastewater treatment by photocatalysis with visible light according to claim 2, characterized in that, The industrial lamp tube is mounted on the support.

6. The device for wastewater treatment by photocatalysis with visible light according to claim 1, characterized in that, The photocatalyst is a narrow bandgap semiconductor material.

7. The visible light photocatalytic wastewater treatment device according to claim 6, characterized in that, The visible light catalyst is a complex of tungstate and molybdate.

8. The device for wastewater treatment by photocatalysis according to claim 1, wherein The visible light source is a xenon lamp.

9. The device for wastewater treatment by photocatalysis according to claim 1, wherein Including the first pipe and the second pipe; The suspension separator includes a separator body, an inlet located on the side of the separator body, and an outlet located at the bottom. The first pipe connects the reaction vessel to the inlet, and the second pipe connects the outlet to the reaction vessel.

10. The device for photocatalytic wastewater treatment according to claim 9, characterized in that, The first pipeline is equipped with a solenoid valve. When the solenoid valve is opened, the suspension in the reaction vessel is automatically transported to the suspension separator under the action of gravity. The second pipeline is equipped with a slurry pump. When the slurry pump is started, the solid-liquid mixture at the bottom of the suspension separator can be returned to the reaction vessel for reuse.

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