A cylindrical membrane dielectric barrier discharge wastewater treatment device

Abstract

This invention provides a cylindrical membrane-type dielectric barrier discharge wastewater treatment device, relating to the field of wastewater treatment technology. The device includes a high-voltage electrode, an inner cylinder, an outer cylinder, an overflow tank, a ground electrode, a periodic structural membrane, and a base. The high-voltage electrode, inner cylinder, and outer cylinder are mounted on the base. The inner cylinder is fitted onto the high-voltage electrode, and the outer cylinder is fitted onto the inner cylinder. The high-voltage electrode, inner cylinder, and outer cylinder form a coaxial structure from the inside out. The ground electrode is adhered to the outer wall of the outer cylinder. The high-voltage electrode is used to connect to a high-voltage power supply. The overflow tank is installed at the end of the outer cylinder away from the base. The height of the inner cylinder relative to the base is greater than that of the outer cylinder relative to the base, and the height of the overflow tank relative to the base is greater than that of the inner cylinder relative to the base. The periodic structural membrane is installed on the inner wall of the outer cylinder. The periodic structural membrane on the inner wall of the outer cylinder helps maintain a stable water surface during discharge, preventing shaking and splashing, thus improving discharge stability. Simultaneously, the periodicity of the membrane significantly improves the uniformity of discharge and the stability of the discharge channel.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a cylindrical membrane dielectric barrier discharge wastewater treatment device. Background Technology

[0002] With the rapid development of industrialization and urbanization worldwide, the discharge of wastewater in various forms is constantly increasing. Many chemical plants and hospitals discharge large amounts of wastewater containing various recalcitrant organic pollutants. Dielectric barrier discharge (DBD), a type of low-temperature plasma discharge, is widely used in wastewater treatment. However, existing DBD devices suffer from poor stability in industrial wastewater treatment processes. Summary of the Invention

[0003] The problem that this invention aims to solve is the poor stability of dielectric barrier discharge in industrial wastewater treatment.

[0004] To address the aforementioned problems, this invention provides a cylindrical membrane-type dielectric barrier discharge wastewater treatment device, comprising: a high-voltage electrode, an inner cylinder, an outer cylinder, an overflow tank, a ground electrode, a periodic structural membrane, and a base. The high-voltage electrode, the inner cylinder, and the outer cylinder are mounted on the base. The inner cylinder is sleeved on the high-voltage electrode, and the outer cylinder is sleeved on the inner cylinder. The high-voltage electrode, the inner cylinder, and the outer cylinder form a coaxial structure from the inside to the outside. The ground electrode is adhered to the outer wall of the outer cylinder. The high-voltage electrode is used to connect to a high-voltage power supply. The overflow tank is installed at the end of the outer cylinder away from the base and communicates with the outer cylinder. The height of the inner cylinder relative to the base is greater than the height of the outer cylinder relative to the base. The height of the overflow tank relative to the base is greater than the height of the outer cylinder relative to the base. The periodic structural membrane is attached to the inner wall of the outer cylinder.

[0005] Optionally, the periodic structure membrane is made of an insulating dielectric material, such as quartz glass, polytetrafluoroethylene, or ceramic.

[0006] Optionally, the thickness of the periodic structure membrane is 0.5 mm to 2 mm.

[0007] Optionally, the surface of the periodic structure membrane is regularly provided with multiple protrusions.

[0008] Optionally, the cylindrical membrane dielectric barrier discharge wastewater treatment device further includes a bubble generator, and the overflow tank is provided with a water inlet. The output end of the bubble generator is connected to the water inlet through a liquid delivery pipe.

[0009] Optionally, the cylindrical membrane dielectric barrier discharge wastewater treatment device further includes a storage tank, a water droplet is provided inside the base, the gap between the inner cylinder and the outer cylinder is connected to the water droplet, a water outlet is provided on the base, the storage tank and the water droplet are connected through the water outlet, and the storage tank is connected to the input end of the bubble generator.

[0010] Optionally, insulating oil is injected into the gap between the inner wall of the inner cylinder and the high-voltage electrode.

[0011] Optionally, the height of the inner cylinder relative to the base is higher than the height of the high-voltage electrode relative to the base.

[0012] Optionally, the high-voltage electrode is made of stainless steel, and a conductive film is provided on the outer wall of the outer cylinder. The conductive film is connected to the ground electrode, and the conductive film is made of tin foil.

[0013] Optionally, the inner cylinder, outer cylinder, overflow pool, and water inlet are made of quartz glass, and the base and water outlet are made of polytetrafluoroethylene.

[0014] The beneficial effects of the cylindrical membrane dielectric barrier discharge wastewater treatment device of the present invention are:

[0015] Wastewater awaiting treatment is temporarily stored in the overflow tank, and the water level gradually increases. When the wastewater level exceeds the top of the outer cylinder, the wastewater flows down the inner wall of the outer cylinder, forming a thin film of water flow. This film energizes the high-voltage electrode, and under the influence of high voltage, a discharge filament is formed between the inner and outer cylinders. Electrons are conducted from the ground electrode to the ground. Discharge is more likely to occur in areas with smaller gaps, forming the discharge filament first. The discharge filament degrades organic pollutants in the water, converting them into harmless or less harmful substances. A periodic structural membrane is installed on the inner wall of the outer cylinder. Due to surface tension, wastewater flows through this membrane, and the water surface adheres to its surface during discharge, reducing splashing and improving stability. Furthermore, the periodic structure of the membrane facilitates the formation of periodic discharge channels, resulting in a more uniform and controllable distribution of the discharge filaments, further enhancing discharge stability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a cylindrical membrane dielectric barrier discharge wastewater treatment device provided in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. High-voltage electrode; 2. Inner cylinder; 3. Outer cylinder; 4. Overflow tank; 5. Ground electrode; 6. Base; 7. Outlet; 8. Inlet; 9. Periodic structured membrane; 10. Bubble generator; 11. Storage tank; 12. Infusion pipe; 13. Drainage tank. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "one" and "more" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] To address the problems existing in the aforementioned related technologies, this embodiment provides a cylindrical membrane dielectric barrier discharge wastewater treatment device.

[0023] like Figure 1As shown in the figure, an embodiment of the present invention provides a cylindrical membrane dielectric barrier discharge wastewater treatment device, comprising: a high-voltage electrode 1, an inner cylinder 2, an outer cylinder 3, an overflow tank 4, a ground electrode 5, a periodic structural membrane 9, and a base 6. The high-voltage electrode 1, the inner cylinder 2, and the outer cylinder 3 are mounted on the base 6. The inner cylinder 2 is sleeved on the high-voltage electrode 1, and the outer cylinder 3 is sleeved on the inner cylinder 2. The high-voltage electrode 1, the inner cylinder 2, and the outer cylinder 3 form a coaxial structure from the inside to the outside. The ground electrode 5 is adhered to the outer wall of the outer cylinder 3. The high-voltage electrode 1 is used to connect to a high-voltage power supply. The overflow tank 4 is installed at the end of the outer cylinder 3 away from the base 6 and is connected to the outer cylinder 3. The height of the inner cylinder 2 relative to the base 6 is greater than the height of the outer cylinder 3 relative to the base 6. The height of the overflow tank 4 relative to the base 6 is greater than the height of the outer cylinder 3 relative to the base 6. The periodic structural membrane 9 is attached to the inner wall of the outer cylinder 3.

[0024] Specifically, the high-voltage electrode 1 can be made of stainless steel. A conductive film is provided on the outer wall of the outer cylinder 3. The conductive film is connected to the ground electrode 5. The conductive film can increase the conductive area of ​​the ground electrode 5, allowing electrons to be transferred from the ground electrode 5 to the ground in a timely manner. The conductive film is made of tin foil, which has strong conductivity, high plasticity, and is easy to fit tightly to the outer wall of the outer cylinder 3. The height of the inner cylinder 2 relative to the base 6 is higher than the height of the high-voltage electrode 1 relative to the base 6. For example, the top height of the high-voltage electrode 1 can be designed to be 150mm, and the top height of the inner cylinder 2 can be designed to be 170mm. This can prevent the high-voltage electrode 1 inside the inner cylinder 2 from contacting sewage. Concealing the high-voltage electrode 1 in the inner cylinder 2 reduces personnel contact and ensures operational safety. The inner cylinder 2, outer cylinder 3, overflow pool 4, and water inlet 8 are made of quartz glass, while the base 6 and water outlet 7 are made of polytetrafluoroethylene (PTFE). These external components that are easily accessible to personnel are made of insulating materials to avoid safety hazards. The components located at the bottom, such as the base 6 and water outlet 7, are made of durable PTFE, while the inner cylinder 2, outer cylinder 3, overflow pool 4, and water inlet 8 are made of durable quartz glass, which can improve their service life.

[0025] In this optional embodiment, the wastewater to be treated is temporarily stored in the overflow tank 4, and the height of the wastewater gradually increases. The rate at which the water level rises in the overflow tank 4 is controlled so that the water level in the overflow tank 4 just exceeds the upper end of the outer cylinder 3. At this time, the sewage flows down along the inner wall of the outer cylinder 3, forming a water flow film. This film will adhere to the surface of the periodic structure membrane 9 during the discharge process, making it less prone to splashing and thus improving stability. In addition, the surface of the periodic structure membrane 9 has a periodic structure, which makes the discharge wires periodically distributed, making the discharge wires more uniform and controllable, further improving the stability of the discharge.

[0026] Optionally, the periodic structural membrane 9 is made of an insulating medium material, such as quartz glass, polytetrafluoroethylene, or ceramic, and the thickness of the periodic structural membrane 9 is 0.5mm-2mm.

[0027] Specifically, the periodic structural membrane 9 also uses an insulating dielectric material, allowing electrons to form discharge filaments under high voltage. The periodic structural membrane 9 is made of high-hardness materials such as quartz glass, polytetrafluoroethylene, or ceramics, ensuring its shape is not easily altered under water flow and discharge, thus guaranteeing a fixed discharge position and improving discharge stability and uniformity. The discharge gap needs to be maintained at a suitable distance. Since the distance between the inner cylinder 2 and the outer cylinder 3 is relatively small, the thickness of the periodic structural membrane 9 needs to be controlled between 0.5mm and 2mm. A suitable thickness of periodic structural membrane is selected based on the requirements.

[0028] The surface of the periodic structure membrane 9 is regularly provided with multiple protrusions (not shown in the figure). The protrusions on the surface of the periodic structure membrane 9 shorten the formation gap of the discharge wires. The discharge wires will form first at these protrusion positions. Water flows through the protrusions, and the discharge wires formed in the air at the protrusions degrade the organic matter in the surrounding sewage. The discharge wires are concentrated at the protrusion positions, the generation position is fixed, the discharge energy utilization rate is high, and the water surface is adsorbed around the protrusions, resulting in strong discharge stability and improved treatment effect.

[0029] Optionally, such as Figure 1 As shown, the cylindrical membrane dielectric barrier discharge wastewater treatment device also includes a bubble generator 10. The overflow tank 4 is provided with a water inlet 8, and the output end of the bubble generator 10 is connected to the water inlet 8 through a liquid delivery pipe 12.

[0030] Specifically, under high voltage, plasma is generated between the outer wall of the inner cylinder 2 and the periodic structural membrane 9. During plasma discharge, electrical energy excites gas molecules and atoms to produce high-energy electrons. These high-energy electrons react with water molecules to generate hydroxyl radicals, which are powerful oxidants capable of oxidizing and degrading organic pollutants in the water. Before entering the overflow tank 4, the wastewater passes through the bubble generator 10. The bubble generator can be a micro-nano scale bubble generator. The increased bubble content in the wastewater output by the bubble generator 10 allows the pollutants in the wastewater to be concentrated on the liquid surface. The presence of gas makes it easier to generate more high-energy electrons and free radicals, thereby strengthening the contact between free radicals and organic pollutants, thus improving energy utilization and pollutant treatment efficiency. The combination of the bubble generator 10 and the periodic structural membrane 9 can greatly improve the stability and treatment effect of the dielectric barrier discharge wastewater treatment device when applied to wastewater treatment, while reducing energy consumption and operating costs.

[0031] Optionally, such as Figure 1As shown, the cylindrical membrane dielectric barrier discharge wastewater treatment device also includes a storage tank 11, a sink 13 is provided inside the base 6, the gap between the inner cylinder 2 and the outer cylinder 3 is connected to the sink 13, an outlet 7 is provided on the base 6, the storage tank 11 and the sink 13 are connected through the outlet 7, and the storage tank 11 is connected to the input end of the bubble generator 10.

[0032] Specifically, the outer cylinder 3 is connected to the base 6, and the base 6 has an annular water trough at its center, serving as a sink 13. The sink 13 has an outlet 7 on its side wall. The sink 13 is connected to the gap between the inner cylinder 2 and the outer cylinder 3, allowing the treated sewage flowing down the inner wall of the outer cylinder 3 to flow into the sink 13. The bubble generator 10 contains a water pump. Under the action of the water pump, the sewage in the sink 13 flows out from the outlet 7 and enters the storage tank 11, and then re-enters the bubble generator 10. After being processed by the bubble generator, the sewage enters the overflow tank 4 from the inlet 8, realizing multiple cycles of sewage treatment until the sewage treatment meets the requirements.

[0033] Optionally, insulating oil is injected into the gap between the inner wall of the inner cylinder 2 and the high-voltage electrode 1.

[0034] Specifically, the inner diameter of the inner cylinder 2 is larger than the outer diameter of the high-voltage electrode 1, and the gap between the two can be 1mm. To prevent discharge in this gap, insulating oil is added to the gap to reduce the loss of electrical energy.

[0035] In the aforementioned cylindrical membrane dielectric barrier discharge wastewater treatment device, the diameter of the high-voltage electrode 1 can be set to 20mm; the inner cylinder 2 has an inner diameter of 21mm, an outer diameter of 25mm, and a thickness of 2mm; the outer cylinder 3 has an inner diameter of 33mm, an outer diameter of 37mm, and a thickness of 2mm; the discharge gap between the inner cylinder 2 and the outer cylinder 3 is 4mm; the inlet 8 and outlet 7 both have an inner diameter of 2mm, an outer diameter of 4mm, and a length of 20mm. The overflow tank 4 has an inner diameter of 29mm, an outer diameter of 49mm, and a height of 50mm. The drain tank 13 has an inner diameter of 9mm, an outer diameter of 15mm, and a height of 30mm.

[0036] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A cylindrical membrane dielectric barrier discharge wastewater treatment device, characterized in that, include: The high-voltage electrode (1), inner cylinder (2), outer cylinder (3), overflow tank (4), ground electrode (5), periodic structural membrane (9), and base (6) are mounted on the base (6). The inner cylinder (2) is fitted onto the high-voltage electrode (1), and the outer cylinder (3) is fitted onto the inner cylinder (2). The high-voltage electrode (1), inner cylinder (2), and outer cylinder (3) form a coaxial structure from the inside to the outside. The ground electrode (5) is attached to the outer cylinder. (3) Outer wall, the high voltage electrode (1) is used to connect to the high voltage power supply, the overflow pool (4) is installed at the end of the outer cylinder (3) away from the base (6) and communicates with the outer cylinder (3), the height of the inner cylinder (2) relative to the base (6) is greater than the height of the outer cylinder (3) relative to the base (6), the height of the overflow pool (4) relative to the base (6) is higher than the height of the outer cylinder (3) relative to the base (6), and the periodic structure membrane (9) is attached to the inner wall of the outer cylinder (3); It also includes a bubble generator (10) and a storage tank (11). The overflow tank (4) is provided with a water inlet (8). The output end of the bubble generator (10) is connected to the water inlet (8) through a delivery pipe (12). A sink (13) is provided inside the base (6). The gap between the inner cylinder (2) and the outer cylinder (3) is connected to the sink (13). The base (6) is provided with a water outlet (7). The storage tank (11) and the sink (13) are connected through the water outlet (7). The storage tank (11) is connected to the input end of the bubble generator (10). The periodic structural membrane (9) is made of an insulating dielectric material, which is quartz glass, polytetrafluoroethylene or ceramic; the thickness of the periodic structural membrane (9) is 0.5mm-2mm. The surface of the periodic structure membrane (9) is regularly provided with multiple protrusions.

2. The cylindrical membrane dielectric barrier discharge wastewater treatment device according to claim 1, characterized in that, Insulating oil is injected into the gap between the inner wall of the inner cylinder (2) and the high-voltage electrode (1).

3. The cylindrical membrane dielectric barrier discharge wastewater treatment device according to claim 1, characterized in that, The height of the inner cylinder (2) relative to the base (6) is higher than the height of the high voltage electrode (1) relative to the base (6).

4. The cylindrical membrane dielectric barrier discharge wastewater treatment device according to claim 1, characterized in that, The high-voltage electrode (1) is made of stainless steel. A conductive film is provided on the outer wall of the outer cylinder (3). The conductive film is connected to the ground electrode (5). The conductive film is made of tin foil.

5. The cylindrical membrane dielectric barrier discharge wastewater treatment device according to any one of claims 1-4, characterized in that, The inner cylinder (2), outer cylinder (3), overflow pool (4) and water inlet (8) are made of quartz glass, and the base (6) and water outlet (7) are made of polytetrafluoroethylene.

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