Cylindrical membrane type dielectric barrier discharge wastewater treatment device

Abstract

The invention provides a cylindrical membrane type dielectric barrier discharge wastewater treatment device, and relates to the technical field of wastewater treatment.The device comprises a high-voltage electrode, an inner cylinder, an outer cylinder, an overflow pool, a ground electrode, a periodic structure membrane and a base, the high-voltage electrode, the inner cylinder and the outer cylinder are installed on the base, the inner cylinder sleeves the high-voltage electrode, the outer cylinder sleeves the inner cylinder, and the periodic structure membrane is installed on the base. The high-voltage electrode, the inner cylinder and the outer cylinder form a coaxial structure from inside to outside, the ground electrode adheres to the outer wall of the outer cylinder, the high-voltage electrode is used for being connected with a high-voltage power source, and the overflow pool is installed at the end, away from the base, of the outer cylinder. The height of the overflow pool relative to the base is higher than that of the inner cylinder relative to the base, and the periodic structure film is installed on the inner wall of the outer cylinder. The periodic structure film is arranged on the inner wall of the outer cylinder, so that the water surface can be kept stable in the discharging process and is not easy to shake and splash, and the discharging stability is improved; meanwhile, due to the periodicity of the periodic structure film, the discharge uniformity and the stability of a discharge channel can be greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a cylindrical membrane-type dielectric barrier discharge wastewater treatment device. Background Art

[0002] With the rapid development of industrialization and urbanization in countries around the world, the amount of wastewater discharged in various forms is also increasing. Many chemical plants and hospitals discharge a large amount of wastewater containing various difficult-to-degrade organic pollutants. Dielectric barrier discharge (DBD) is a type of low-temperature plasma discharge and is widely used in wastewater treatment. However, the dielectric barrier discharge in existing devices has the problem of poor stability in the process of industrial wastewater treatment. Summary of the invention

[0003] The problem to be solved by the present invention is that dielectric barrier discharge has poor stability during the process of industrial wastewater treatment.

[0004] To solve the above problems, the present invention provides a cylindrical membrane dielectric barrier discharge wastewater treatment device, comprising: a high-voltage electrode, an inner cylinder, an outer cylinder, an overflow pool, a ground electrode, a periodic structure membrane and a base, wherein the high-voltage electrode, the inner cylinder and the outer cylinder are installed on the base, the inner cylinder is sleeved on the high-voltage electrode, 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 be connected to a high-voltage power supply, the overflow pool is installed at one end of the outer cylinder away from the base and is connected to 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 pool relative to the base is higher than the height of the outer cylinder relative to the base, and the periodic structure membrane is attached to the inner wall of the outer cylinder.

[0005] Optionally, the material of the periodic structure film is an insulating dielectric material, and the insulating dielectric material is quartz glass, polytetrafluoroethylene or ceramic.

[0006] Optionally, the thickness of the periodic structure film is 0.5 mm-2 mm.

[0007] Optionally, a plurality of protrusions are regularly arranged on the surface of the periodic structure film.

[0008] Optionally, the cylindrical membrane dielectric barrier discharge wastewater treatment device further includes a bubble generator, a water inlet is provided on the overflow tank, and an output end of the bubble generator is connected to the water inlet via an infusion tube.

[0009] Optionally, the cylindrical membrane dielectric barrier discharge wastewater treatment device also includes a storage tank, a water pool is arranged in the base, the gap between the inner cylinder and the outer cylinder is connected to the water pool, a water outlet is arranged on the base, the storage tank and the water pool 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, a height of the inner cylinder relative to the base is higher than a height of the high-voltage electrode relative to the base.

[0012] Optionally, the high-voltage electrode is made of stainless steel, 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 tinfoil.

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

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

[0015] The wastewater to be treated is temporarily stored in the overflow pool, and the height of the wastewater gradually increases. When the water level of the wastewater exceeds the upper end of the outer cylinder, the wastewater flows downward along the inner wall of the outer cylinder to form a water flow film, and the high-voltage electrode is energized. Under the action of high voltage, a discharge wire is formed between the inner cylinder and the outer cylinder, and electrons are led out from the ground electrode. It is easy to discharge first in places with small gaps to form a discharge wire. The discharge wire degrades organic pollutants in the water and converts them into harmless or low-harm substances. A periodic structural membrane is set on the inner wall of the outer cylinder. Due to the tension of the water surface, the sewage flows through the periodic structural membrane. The water surface will adhere to the surface of the periodic structural membrane during the discharge process, and it is not easy to splash, thereby improving stability. In addition, the periodic structural membrane is more likely to form a periodic discharge channel due to the periodicity of the surface, making the distribution of the discharge wire more uniform and controllable, further improving the stability of the discharge. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Description of reference numerals:

[0018] 1. High-voltage electrode; 2. Inner cylinder; 3. Outer cylinder; 4. Overflow pool; 5. Ground electrode; 6. Base; 7. Water outlet; 8. Water inlet; 9. Periodic structure membrane; 10. Bubble generator; 11. Storage tank; 12. Infusion tube; 13. Drain pool. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0020] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0021] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0022] In view of the problems existing in the above-mentioned related technologies, this embodiment provides a cylindrical membrane dielectric barrier discharge wastewater treatment device.

[0023] like Figure 1As shown, a cylindrical membrane dielectric barrier discharge wastewater treatment device provided by an embodiment of the present invention includes: a high-voltage electrode 1, an inner cylinder 2, an outer cylinder 3, an overflow pool 4, a ground electrode 5, a periodic structure membrane 9 and a base 6, wherein the high-voltage electrode 1, the inner cylinder 2 and the outer cylinder 3 are installed 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 be connected to a high-voltage power supply, the overflow pool 4 is installed at one 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 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.

[0024] Specifically, the material of the high-voltage electrode 1 can be stainless steel, and a conductive film is arranged on the outer wall of the outer cylinder 3, and the conductive film is connected to the ground electrode 5. The conductive film can expand the conductive area of ​​the ground electrode 5, so that electrons are transmitted from the ground electrode 5 to the ground in time. The material of the conductive film is tin foil, which has strong conductivity and plasticity, and is easy to fit tightly with 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 150 mm, and the top height of the inner cylinder 2 can be designed to be 170 mm, which can prevent the high-voltage electrode 1 in the inner cylinder 2 from contacting with sewage; the high-voltage electrode 1 is hidden in the inner cylinder 2 to reduce personnel contact and ensure safe operation. The inner tube 2, the outer tube 3, the overflow pool 4 and the water inlet 8 are made of quartz glass, and the base 6 and the water outlet 7 are made of polytetrafluoroethylene. These external parts that are easily touched by personnel are made of insulating materials to avoid safety hazards. Among them, the parts located at the bottom, such as the base 6 and the water outlet 7, are made of polytetrafluoroethylene that is not easily damaged, while the inner tube 2, the outer tube 3, the overflow pool 4 and the water inlet 8 are made of durable quartz glass, which can increase the service life.

[0025] In this optional embodiment, wastewater to be treated is temporarily stored in the overflow tank 4, and the height of the wastewater gradually increases. The speed of the water level rise in the overflow tank 4 is controlled so that the water surface of the wastewater in the overflow tank 4 just exceeds the upper end of the outer tube 3. At this time, the sewage flows downward along the inner wall of the outer tube 3 to form a water flow film, which will adhere to the surface of the periodic structure membrane 9 during the discharge process, and splashing is not easy to occur, thereby improving stability. In addition, the surface of the periodic structure membrane 9 has a periodic structure. The periodic structure makes the discharge wire present a periodic distribution, so that the discharge wire is more uniform and controllable, and the stability of the discharge is further improved.

[0026] Optionally, the material of the periodic structure film 9 is an insulating dielectric material, and the insulating dielectric material is quartz glass, polytetrafluoroethylene or ceramics. The thickness of the periodic structure film 9 is 0.5 mm-2 mm.

[0027] Specifically, the periodic structure film 9 also uses insulating dielectric materials to allow electrons to form discharge filaments under high voltage. The periodic structure film 9 uses materials with high hardness such as quartz glass, polytetrafluoroethylene or ceramics. The shape will not be easily changed under the action of water flow and discharge, which can ensure the fixation of the discharge position and improve the discharge stability and uniformity. The discharge gap needs to be maintained at a suitable distance. The distance between the inner cylinder 2 and the outer cylinder 3 is small, so it is necessary to control the thickness of the periodic structure film 9 to be maintained between 0.5mm-2mm, and a periodic structure film of suitable thickness is selected according to the needs.

[0028] The surface of the periodic structure membrane 9 is regularly provided with a plurality of protrusions (not shown in the figure). The protrusions on the surface of the periodic structure membrane 9 will shorten the gap for the formation of discharge filaments. Discharge filaments will be formed first at these protrusions. Water will flow through the protrusions. Discharge filaments will be formed in the air at the protrusions to degrade organic matter in the surrounding sewage. The discharge filaments are concentrated at the protrusions, resulting in a fixed position and a high utilization rate of discharge energy. Moreover, the water surface is adsorbed around the protrusions, the discharge stability is strong, and the treatment effect is improved.

[0029] Alternatively, if Figure 1 As shown, the cylindrical membrane dielectric barrier discharge wastewater treatment device also includes a bubble generator 10 , a water inlet 8 is provided on the overflow pool 4 , and the output end of the bubble generator 10 is connected to the water inlet 8 through a liquid infusion tube 12 .

[0030] Specifically, under the action of high voltage, plasma is generated between the outer wall of the inner cylinder 2 and the periodic structure membrane 9. During the plasma discharge process, the electric energy will excite gas molecules and atoms to generate high-energy electrons. The high-energy electrons react with water molecules to generate hydroxyl radicals. Hydroxyl radicals are powerful oxidants that can oxidize and degrade organic pollutants in water. Before entering the overflow tank 4, the sewage first passes through the bubble generator 10. The bubble generator can be a micro-nano bubble generator. The amount of bubbles in the sewage output by the bubble generator 10 increases. The presence of nano-micro bubbles can enrich the pollutants in the sewage to the liquid surface. Where there is gas, more high-energy electrons and free radicals are easily generated, thereby strengthening the contact between free radicals and organic pollutants, thereby improving energy utilization and pollutant treatment efficiency. The bubble generator 10 is combined with the periodic structure membrane 9, which can greatly improve the stability and treatment effect of the dielectric barrier discharge wastewater treatment device when applied to sewage treatment, and reduce energy consumption and operating costs.

[0031] Alternatively, if Figure 1As shown, the cylindrical membrane dielectric barrier discharge wastewater treatment device also includes a storage tank 11, a water pool 13 is arranged in the base 6, the gap between the inner cylinder 2 and the outer cylinder 3 is connected to the water pool 13, and a water outlet 7 is arranged on the base 6. The storage tank 11 and the water pool 13 are connected through the water 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 an annular water trough is arranged at the center of the base 6, which serves as a sink 13. A water outlet 7 is opened on the side wall of the sink 13. The sink 13 is connected to the gap between the inner cylinder 2 and the outer cylinder 3, so that the treated sewage flowing down the inner wall of the outer cylinder 3 flows 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 water outlet 7 and enters the storage tank 11, and then enters the bubble generator 10 again. After being processed by the bubble generator, it enters the overflow tank 4 from the water inlet 8, thereby 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 a gap formed between the two may be 1 mm. To avoid discharge in the gap, insulating oil is added to the gap to reduce the dissipation and waste of electric energy.

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

[0036] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A cylindrical membrane dielectric barrier discharge wastewater treatment device, characterized in that: include: A high-voltage electrode (1), an inner cylinder (2), an outer cylinder (3), an overflow pool (4), a ground electrode (5), a periodic structure 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); 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 cylinder (3) outer wall, the high-voltage electrode (1) is used to be connected to a high-voltage power supply, the overflow pool (4) is installed at one 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 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).

2. The cylindrical membrane dielectric barrier discharge wastewater treatment device according to claim 1, characterized in that: The material of the periodic structure film (9) is an insulating dielectric material, and the insulating dielectric material is quartz glass, polytetrafluoroethylene or ceramic.

3. The cylindrical membrane dielectric barrier discharge wastewater treatment device according to claim 1, characterized in that: The thickness of the periodic structure film (9) is 0.5 mm to 2 mm.

4. The cylindrical membrane dielectric barrier discharge wastewater treatment device according to claim 1, characterized in that: The surface of the periodic structure film (9) is regularly provided with a plurality of protrusions.

5. The cylindrical membrane dielectric barrier discharge wastewater treatment device according to claim 1, characterized in that: It also comprises a bubble generator (10), the overflow pool (4) is provided with a water inlet (8), and the output end of the bubble generator (10) is connected to the water inlet (8) via a liquid infusion tube (12).

6. The cylindrical membrane dielectric barrier discharge wastewater treatment device according to claim 5, characterized in that: The invention also comprises a storage pool (11), a water pool (13) is arranged in the base (6), a gap between the inner cylinder (2) and the outer cylinder (3) is connected to the water pool (13), a water outlet (7) is arranged on the base (6), the storage pool (11) and the water pool (13) are connected via the water outlet (7), and the storage pool (11) is connected to the input end of the bubble generator (10).

7. 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).

8. 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).

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

10. The cylindrical membrane dielectric barrier discharge wastewater treatment device according to any one of claims 1 to 9, characterized in that: The inner tube (2), the outer tube (3), the overflow pool (4) and the water inlet (8) are made of quartz glass, and the base (6) and the water outlet (7) are made of polytetrafluoroethylene.

Images