Dielectric barrier discharge water treatment device and treatment method

Abstract

The present invention provides a dielectric barrier discharge water treatment device and method, relating to the technical field of water treatment equipment. The device includes a discharge structure, a venturi tube, a reaction chamber, and an energy dissipation component. The discharge mechanism includes a container, a discharge gap, a stainless steel mesh, and a high-voltage electrode interface. The stainless steel mesh serves as a high-voltage electrode, and the wastewater in the reaction chamber serves as a low-voltage electrode. A discharge gap is formed between the inner wall of the container and the outer wall of the reaction chamber. The venturi tube and reaction chamber are located within the discharge structure. The water in the container flows through the venturi tube through an external pipe and enters the reaction chamber. A photocatalytic material box is provided on the inner wall of the reaction chamber, and the energy dissipation component is provided in the lower area of ​​the reaction chamber. The dielectric barrier discharge water treatment device provided by the present invention can fully utilize the light energy generated during discharge and the micro-nano bubbles generated by the venturi tube in combination with photocatalytic materials to improve the degradation efficiency of pollutants and achieve efficient removal of pollutants.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment equipment, and in particular relates to a dielectric barrier discharge water treatment device. Background Art

[0002] With industrial development, wastewater discharge is increasing, making wastewater treatment increasingly difficult. Traditional wastewater treatment methods are no longer able to degrade wastewater. Low-temperature plasma has attracted widespread attention due to its ease of generation, the presence of a large amount of active substances, and its high pollutant degradation efficiency. Dielectric barrier discharge (DBD) water treatment technology, a form of low-temperature plasma water treatment technology, inserts an insulating dielectric into the gas-phase discharge gap to protect the electrodes. Its discharge method combines the generation of low-temperature plasma with the production of large amounts of gas, making it a green water treatment technology. Research has shown that DBD offers advantages over other discharge methods, including corona discharge, spark discharge, and arc discharge, such as high discharge stability, good discharge uniformity, strong discharge dispersion, and higher electron density and energy.

[0003] Compared to ordinary bubbles, micro- and nanobubbles (MNBs) possess a larger specific surface area, faster mass transfer, surface charge, longer residence time in water, and the ability to generate free radicals. These advantages have led to their widespread use in various fields, particularly in water treatment. When micro- and nanobubbles disintegrate in water, they spontaneously generate active substances such as hydroxyl radicals, which can promote the degradation of pollutants in water. These advantages offer new possibilities for improving and optimizing water treatment processes.

[0004] Photocatalytic oxidation is an advanced oxidation technology that combines oxidants such as O2 and H2O2 with light radiation through photoinduced oxidation. The light used is primarily ultraviolet light, including UV-H2O2 and UV-O3 processes. These processes can be used to treat difficult-to-degrade substances such as CCl4 and polychlorinated biphenyls in wastewater. Furthermore, in the Fenton system with UV light, a synergistic effect exists between UV light and iron ions, significantly accelerating the decomposition of H2O2 to produce hydroxyl radicals, promoting the oxidative removal of organic matter.

[0005] To date, dielectric barrier discharge (DBD) water treatment technology still suffers from excessive energy consumption. Therefore, it is necessary to provide a device that can couple DBD water treatment technology with micro-nano bubbles and photocatalytic materials, enabling DBD water treatment technology to efficiently remove pollutants. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a dielectric barrier discharge water treatment device and a treatment method.

[0007] The technical solution adopted by the present invention is: a dielectric barrier discharge water treatment device, including a discharge structure, a venturi tube, a reaction chamber, and an energy dissipation component; the discharge mechanism includes a container, a discharge gap, a stainless steel mesh, and a high-voltage electrode interface; the container includes an upper raw water tank and a lower water tank, the raw water tank and the water tank are connected, the upper end of the raw water tank is provided with an exhaust port, a raw water inlet, and a reaction chamber outlet, the lower end of the water tank is provided with a water tank outlet and a reaction chamber inlet, the water tank outlet is connected to the reaction chamber inlet, the stainless steel mesh and the high-voltage electrode interface are provided on the outer wall of the container, the high-voltage electrode interface and the stainless steel mesh are connected, and a discharge gap is formed between the inner wall of the container and the outer wall of the reaction chamber;

[0008] The venturi tube and the reaction chamber are located in the discharge structure, the water inlet of the reaction chamber is connected to the lower end of the venturi tube, the upper end of the venturi tube is connected to the reaction chamber, the upper end of the reaction chamber is connected to the water outlet of the reaction chamber, the inner wall of the reaction chamber is provided with a photocatalytic material box, and the energy dissipation component is provided in the lower area of ​​the reaction chamber.

[0009] Furthermore, the water outlet of the water tank and the water inlet of the reaction chamber are respectively connected to a diaphragm pump.

[0010] Furthermore, the energy dissipation component includes an energy dissipation baffle and an energy dissipation baffle fixing bracket.

[0011] Furthermore, the energy dissipation baffle is fixed to the outer wall of the photocatalytic material box by an energy dissipation baffle fixing bracket.

[0012] Furthermore, the container is made of quartz glass.

[0013] Furthermore, the photocatalytic material box is arranged in parallel with the discharge gap.

[0014] The present invention also provides a dielectric barrier discharge water treatment device and a treatment method. Using the dielectric barrier discharge reaction device, raw water enters the discharge structure to undergo dielectric barrier discharge, and the generated low-temperature plasma quickly contacts and reacts with the raw water. The wastewater and the generated gas after the reaction enter the lower part of the water tank.

[0015] The venturi tube then sucks in the gas generated after the dielectric barrier discharge, causing the gas to mix with the wastewater in the form of micro-nano bubbles and enter the reaction chamber together. The wastewater entering the reaction chamber dissipates energy through the energy dissipation component.

[0016] Finally, the light energy generated by the discharge activates the photocatalytic material in the photocatalytic material box and reacts with the wastewater. The treated wastewater flows out from the outlet of the reaction chamber, completing the wastewater treatment.

[0017] In the device of the present invention, the gas generated in the discharge gap sinks into the water tank; at the same time, the gas is injected into the wastewater in the form of micro-nano bubbles. The micro-nano bubbles increase the mass transfer efficiency of substances and also increase the turbulence of the wastewater, allowing the wastewater to fully react. When the micro-nano bubbles annihilate, active substances such as hydroxyl free radicals are generated to promote the degradation of pollutants. Negative pressure can be generated inside the Venturi tube, which self-sucks gas and reduces the use of boosting equipment.

[0018] The device of the present invention arranges a photocatalytic material box in parallel with the discharge gap. The photocatalytic material can fully utilize the light energy in the discharge gap for activation. The reflective material can also be wrapped around the outside of the device to increase the utilization efficiency of light energy.

[0019] The present invention can be used in series or in parallel by using multiple devices, and using the outlet of the reaction chamber of the previous device as the raw water inlet of the second device to meet the treatment requirements of different wastewaters and achieve a higher treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of the dielectric barrier discharge water treatment device provided by the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the dielectric barrier discharge water treatment device provided by the present invention;

[0023] Figure 3 It is a front view of the dielectric barrier discharge water treatment device provided by the present invention.

[0024] Reference numerals:

[0025] 1. Raw water inlet; 2. Raw water tank; 3. Exhaust port; 4. Discharge gap; 5. Stainless steel mesh; 6. High-voltage electrode interface; 7. Water tank; 8. Water tank outlet; 9. Reaction chamber inlet; 10. Venturi tube; 11. Reaction chamber; 12. Photocatalytic material box; 13. Reaction chamber outlet; 14. Energy dissipation baffle; 15. Energy dissipation baffle fixing bracket. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] The terms "first" and "second" in the specification and claims of the present invention may explicitly or implicitly refer to one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. Furthermore, the term "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 understood as limiting the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] The following is combined with Figure 1-Figure 3 As shown, this embodiment provides a dielectric barrier discharge water treatment device, including a discharge structure, a venturi tube 10, a reaction chamber 11 and an energy dissipation component;

[0031] The discharge mechanism includes a container, a discharge gap 4, a stainless steel mesh 5 and a high-voltage electrode interface 6. The container includes an upper raw water tank 2 and a lower water tank 7. The raw water tank 2 and the water tank 7 are connected. The upper end of the raw water tank 2 is provided with an exhaust port 3, a raw water inlet 1 and a reaction chamber water outlet 13. The lower end of the water tank 7 is provided with a water tank outlet 8 and a reaction chamber water inlet 9. The water tank outlet 8 is connected to the reaction chamber water inlet 9. The water tank outlet 8 and the reaction chamber water inlet 9 are respectively connected to a diaphragm pump. The stainless steel mesh 5 and the high-voltage electrode interface 6 are provided on the outer wall of the container. The high-voltage electrode interface 6 and the stainless steel mesh 5 are connected. When the device is running, a discharge gap 4 is formed between the inner wall of the container and the outer wall of the reaction chamber 11.

[0032] The venturi tube 10 and reaction chamber 11 are located within the discharge structure. The reaction chamber water inlet 9 is connected to the lower end of the venturi tube 10, and the upper end of the venturi tube 10 is connected to the reaction chamber 11. The upper end of the reaction chamber 11 is connected to the reaction chamber water outlet 13. A photocatalytic material cartridge 12 is provided on the inner wall of the reaction chamber 11. The photocatalytic material cartridge 12 is arranged parallel to the discharge gap 4. The photocatalytic material can fully utilize the light energy in the discharge gap 4 for activation. In addition, the outer surface of the cartridge can be wrapped with reflective material to increase the efficiency of light energy utilization.

[0033] The energy dissipation component is located in the lower region of the reaction chamber 11 and includes an energy dissipation baffle 14 and an energy dissipation baffle fixing bracket 15. The energy dissipation baffle 14 is fixed to the outer wall of the photocatalytic material box 12 by the energy dissipation baffle fixing bracket 15. The energy dissipation component can effectively dissipate energy of the liquid flowing through the venturi tube, increasing the residence time of the liquid in the reaction chamber and ensuring a more complete subsequent reaction.

[0034] The material of the container is preferably quartz glass. Quartz glass has excellent transparency, which allows the light generated during the discharge process to pass through the quartz glass and activate the photocatalytic material for photocatalytic oxidation; quartz glass has high heat resistance and can ensure the normal operation of the dielectric barrier discharge process; quartz glass has high chemical stability, which can ensure that wastewater does not react with the equipment, ensuring the long-term use of the equipment.

[0035] When the device is in operation, raw water is injected into the raw water tank 2, and the raw water flows into the lower layer of the raw water tank 2. The air in the upper layer of the raw water tank 2 is discharged from the exhaust port 3 to ensure that the raw water can form a water film normally. The raw water enters the discharge gap 4 in the form of a water film for dielectric barrier discharge water treatment, wherein the stainless steel mesh 5 serves as a high-voltage electrode and the wastewater in the reaction chamber 11 serves as a low-voltage electrode. The low-temperature plasma generated by dielectric barrier discharge quickly contacts and reacts with the raw water. The reacted wastewater and the generated gas enter the water tank 7. The wastewater treated by the low-temperature plasma is stored below the water tank 7, and the gas is stored above the water tank. The wastewater below the water tank 7 flows out from the water tank outlet 8, is pressurized by a diaphragm pump, and enters the venturi tube 10 from the reaction chamber inlet 9. The venturi tube 10 serves as a micro-nano bubble generator. It can generate negative pressure inside, self-sucking the gas above the water tank 7, reducing the use of boosting equipment, and allowing the gas to mix with the wastewater in the form of micro-nano bubbles and enter the reaction chamber 11 together. The micro-nano bubbles can increase the mass transfer efficiency of the substances and the turbulence of the wastewater, allowing the wastewater to fully react. When the micro-nano bubbles are annihilated, active substances such as hydroxyl free radicals are generated to promote the degradation of pollutants.

[0036] The wastewater entering the reaction chamber 11 then dissipates energy through the energy dissipation baffle 14 in the energy dissipation component. Since the wastewater has a high flow rate when passing through the Venturi tube, the energy dissipation baffle 14 can dissipate energy of the wastewater, thereby reducing the flow rate of the wastewater and increasing the residence time of the wastewater in the reaction chamber, ensuring that the wastewater and the micro-nano bubbles have sufficient time to exchange substances.

[0037] Finally, the light energy generated by the discharge activates the photocatalytic material in the photocatalytic material box 12 and reacts with the wastewater, and the treated wastewater flows out from the water outlet 13 of the reaction chamber.

[0038] Furthermore, the present invention can be used in series or parallel with multiple devices, with the reaction chamber outlet 13 of one device serving as the raw water inlet 1 of a second device, to meet the treatment needs of different wastewaters and achieve higher treatment efficiency. The treated water in this device does not circulate within the equipment, and the types and concentrations of pollutants generated at different reaction times can be measured, facilitating in-depth analysis of the pollutant degradation process.

[0039] This embodiment also provides a dielectric barrier discharge water treatment method:

[0040] The dielectric barrier discharge water treatment device of the present invention is used to treat wastewater. Raw water enters the raw water tank 2 from the raw water inlet 1. After the raw water is injected into the raw water tank 2, the raw water flows into the lower layer of the raw water tank 2, while the upper air is discharged from the exhaust port 3. The raw water then enters the discharge gap 4 in the form of a water film to undergo dielectric barrier discharge water treatment. The generated low-temperature plasma can quickly contact and react with the raw water. The wastewater and the generated gas after the reaction enter the water tank 7. The wastewater treated with the low-temperature plasma is stored at the bottom of the water tank 7, and the gas is stored at the top of the water tank.

[0041] The wastewater below the water tank 7 is pressurized by a diaphragm pump from the water tank outlet 8 to the water inlet 9 of the reaction chamber and enters the venturi tube 10. The venturi tube 10 sucks in the gas above the water tank 7. The venturi tube 10 serves as a micro-nano bubble generating device, and can generate negative pressure inside. It sucks in the gas above the water tank 7, reducing the use of boosting equipment, allowing the gas to mix with the wastewater in the form of micro-nano bubbles and enter the reaction chamber 11 together. The micro-nano bubbles can increase the mass transfer efficiency of substances and the turbulence of the wastewater, so that the wastewater reacts fully. When the micro-nano bubbles are annihilated, active substances such as hydroxyl free radicals are generated to promote the degradation of pollutants. The wastewater entering the reaction chamber 11 dissipates energy through the energy dissipation baffle 14 in the energy dissipation component.

[0042] Finally, the light energy generated by the discharge activates the photocatalytic material in the photocatalytic material box 12 and reacts with the wastewater. The treated wastewater flows out from the water outlet 13 of the reaction chamber, and the wastewater treatment is completed.

[0043] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dielectric barrier discharge water treatment device, characterized in that: It includes a discharge structure, a venturi tube (10), a reaction chamber (11) and an energy dissipation component; The discharge structure comprises a container, a discharge gap (4), a stainless steel mesh (5) and a high-voltage electrode interface (6); the container comprises an upper raw water tank (2) and a lower water tank (7); the raw water tank (2) and the water tank (7) are connected; the upper end of the raw water tank (2) is provided with an exhaust port (3), a raw water inlet (1) and a reaction chamber outlet (13); the lower end of the water tank (7) is provided with a water tank outlet (8) and a reaction chamber inlet (9); the water tank outlet (8) is connected to the reaction chamber inlet (9); the stainless steel mesh (5) and the high-voltage electrode interface (6) are provided on the outer wall of the container; the high-voltage electrode interface (6) and the stainless steel mesh (5) are connected; a discharge gap (4) is formed between the inner wall of the container and the outer wall of the reaction chamber (11); The venturi tube (10) and the reaction chamber (11) are located in the discharge structure, the reaction chamber water inlet (9) is connected to the lower end of the venturi tube (10), the upper end of the venturi tube (10) is connected to the reaction chamber (11), the upper end of the reaction chamber (11) is connected to the reaction chamber water outlet (13), the inner wall of the reaction chamber (11) is provided with a photocatalytic material box (12), and the energy dissipation component is provided in the lower area of ​​the reaction chamber (11).

2. A dielectric barrier discharge water treatment device according to claim 1, characterized in that: The water tank outlet (8) and the reaction chamber water inlet (9) are respectively connected to a diaphragm pump.

3. The dielectric barrier discharge water treatment device according to claim 1, characterized in that: The energy dissipation component comprises an energy dissipation baffle (14) and an energy dissipation baffle fixing bracket (15).

4. A dielectric barrier discharge water treatment device according to claim 3, characterized in that: The energy dissipation baffle (14) is fixed to the outer wall of the photocatalytic material box (12) by an energy dissipation baffle fixing bracket (15).

5. The dielectric barrier discharge water treatment device according to claim 1, characterized in that: The container is made of quartz glass.

6. The dielectric barrier discharge water treatment device according to claim 1, characterized in that: The photocatalytic material box (12) is arranged in parallel with the discharge gap (4).

7. A dielectric barrier discharge water treatment method, characterized in that: The dielectric barrier discharge water treatment device according to any one of claims 1 to 6 comprises the following steps: The raw water enters the discharge structure for dielectric barrier discharge, and the generated low-temperature plasma quickly contacts and reacts with the raw water. The wastewater and the generated gas after the reaction enter the lower part of the water tank (7); Then, the venturi tube (10) sucks in the gas generated after the dielectric barrier discharge, so that the gas is mixed with the wastewater in the form of micro-nano bubbles and enters the reaction chamber (11) together. The wastewater entering the reaction chamber (11) dissipates energy through the energy dissipation component; Finally, the light energy generated by the discharge activates the photocatalytic material in the photocatalytic material box (12) and reacts with the wastewater. The treated wastewater flows out from the water outlet (13) of the reaction chamber, completing the wastewater treatment.

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