Dielectric barrier discharge wastewater treatment device

Abstract

The invention discloses a dielectric barrier discharge wastewater treatment device, and relates to the technical field of wastewater treatment. Comprising a discharge box capable of accommodating wastewater and provided with a conductive electrode at the bottom; the dielectric barrier discharge rod is mounted at the upper part of the inner cavity of the discharge box and can rotate around the center line of the discharge box; and the pulse power supply is electrically connected with the dielectric barrier discharge rod and the conductive electrode respectively. The dielectric barrier discharge rod can rotate relative to the center line of the discharge box to form circular sliding stable plasma discharge, and the dielectric barrier discharge rod directly discharges the wastewater to ensure effective contact between the wastewater and the plasma, so that the wastewater can be quickly and effectively treated, and the surface tension of the waste liquid opposite to the discharge position is effectively changed; the local vortex is formed to drive the liquid to flow and circulate inside, so that the treatment effect is enhanced, the treatment efficiency is high, and the requirement of high-capacity wastewater treatment is met.

Description

Technical Field

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

[0002] In recent years, plasma discharge water treatment technology has been widely used in the field of environmentally friendly wastewater treatment due to its advantages such as high oxidation efficiency, non-selectivity, no secondary pollution, and operation at normal temperature and pressure. In plasma discharge water treatment technology, dielectric barrier discharge is a typical non-equilibrium gas discharge that can occur at normal pressure (atmospheric pressure) and room temperature. Among them, there are two main types of dielectric barrier discharge: plate-shaped dielectric barrier discharge and rod-shaped dielectric barrier discharge. Specifically: The principle of the existing plate-shaped dielectric barrier discharge water treatment device is to place two electrodes in parallel and facing each other in the reactor, at least one of which is covered by an insulating dielectric layer. An AC voltage or a pulse voltage is applied between the two electrodes. When the voltage exceeds the breakdown voltage, the gas is broken down and a dielectric barrier discharge is formed, generating a large number of high-energy electrons (electron avalanche effect). The high-energy electrons collide with water molecules and oxygen molecules, producing a corresponding series of physical and chemical effects, such as strong oxidizing active particles, shock waves and ultraviolet light. The plasma generated by the dielectric barrier discharge will destroy the chemical bonds of organic pollutants in the water, degrade organic macromolecular pollutants, and ultimately achieve the purpose of water purification.

[0003] The existing rod-shaped dielectric barrier discharge water treatment device mainly adopts a vertical coaxial discharge structure, and the plasma generated therein generates avalanche electrons driven by bubbles.

[0004] The inventors' research has found that existing plate-shaped dielectric barrier discharge structures struggle to maintain uniform, large-area discharge on a horizontal surface. Furthermore, the plate-shaped structure is susceptible to fracture of the insulating dielectric (typically ceramic) under high pulse thermal stress, making it unsuitable for high-capacity and long-duration wastewater treatment. Furthermore, existing rod-shaped dielectric barrier discharge structures have a shorter electron path in water. Compared to pure gas-phase discharge, the breakdown of bubbles in the liquid is more difficult, and the probability of electron absorption by the wastewater is lower. Consequently, most water samples are unable to effectively contact the plasma, resulting in insufficient wastewater treatment capacity and an inability to meet the needs of large-scale wastewater treatment. Summary of the Invention

[0005] In response to the technical problem that existing dielectric barrier discharge plasma water treatment devices cannot meet the needs of large-capacity wastewater treatment, the present invention provides a dielectric barrier discharge wastewater treatment device, in which the dielectric barrier discharge rod can rotate relative to the center line of the discharge box to form a circular sliding stable plasma discharge, and the dielectric barrier discharge rod directly discharges the wastewater, which can ensure effective contact between the wastewater and the plasma, thereby quickly and effectively treating the wastewater, and effectively changing the surface tension of the waste liquid facing the discharge position, forming a local vortex to drive the internal flow circulation of the liquid, thereby enhancing the treatment effect, having the characteristics of high treatment efficiency and high treatment efficiency, and meeting the needs of large-capacity wastewater treatment.

[0006] The present invention is achieved through the following technical solutions: The present invention provides a dielectric barrier discharge wastewater treatment device, comprising: a discharge box capable of containing wastewater and having a conductive electrode installed at the bottom; a dielectric barrier discharge rod installed at the upper part of the inner cavity of the discharge box and capable of rotating around the center line of the discharge box; and a pulse power supply electrically connected to the dielectric barrier discharge rod and the conductive electrode respectively.

[0007] The dielectric barrier discharge wastewater treatment device provided by the present invention includes a discharge box, a dielectric barrier discharge rod and a pulse power supply. The discharge box can accommodate wastewater and has a conductive electrode installed at the bottom. The dielectric barrier discharge rod is installed at the upper part of the inner cavity of the discharge box and can rotate around the center line of the discharge box. The pulse power supply is electrically connected to the dielectric barrier discharge rod and the conductive electrode respectively. When treating wastewater, the wastewater is placed in the discharge box, and then power is supplied to the dielectric barrier discharge rod and the conductive electrode by the pulse power supply. Since the conductive electrode is installed at the bottom of the inner cavity of the discharge box and the wastewater has a high conductivity, it is directly electrically connected to the conductive electrode. The wastewater is directly used as the discharge electrode. When the voltage between the dielectric barrier discharge rod and the wastewater liquid surface exceeds the breakdown voltage, the gas between the dielectric barrier discharge rod and the wastewater liquid surface is broken down to form a dielectric barrier discharge, generating a large number of high-energy electrons. The high-energy electrons collide with water molecules and oxygen molecules, generating a series of corresponding physical and chemical effects, including strong oxidizing active particles, shock waves and ultraviolet light. The plasma generated by the dielectric barrier discharge will destroy the chemical bonds of organic pollutants in the water, degrade organic macromolecular pollutants, and ultimately purify the water in the discharge box.

[0008] The dielectric barrier discharge rod rotates relative to the centerline of the discharge chamber to form a stable, circular, sliding plasma discharge, achieving a "surface-sweeping" plasma water surface discharge. The wastewater serves as the discharge electrode, and the dielectric barrier discharge rod directly discharges into the wastewater, ensuring effective contact between the wastewater and the plasma, thereby rapidly and effectively treating the wastewater. Furthermore, as the dielectric barrier discharge rod rotates, it effectively changes the surface tension of the wastewater directly facing the discharge position, forming local eddies that drive internal flow and circulation, enhancing the treatment effect.

[0009] At the same time, through the rotation of the dielectric barrier discharge rod, "surface scanning" plasma water surface discharge is realized to perform uniform large-area discharge. Compared with the plate-shaped dielectric barrier discharge water treatment device, it can avoid the situation where the insulating medium of the dielectric barrier discharge rod is broken under high pulse thermal stress.

[0010] In summary, the dielectric barrier discharge wastewater treatment device provided by the present invention has the characteristics of high treatment efficiency and high treatment efficiency, and meets the needs of large-capacity wastewater treatment.

[0011] In an optional embodiment of the present application, a conductive slide rail is installed on the upper part of the inner cavity of the discharge box, the conductive slide rail is a circular structure, and the conductive slide rail is coaxially arranged with the discharge box; the first self-driving wheel and the second self-driving wheel are respectively provided at both ends of the dielectric barrier discharge rod, and the first self-driving wheel and the second self-driving wheel are adapted to the conductive slide rail so that the dielectric barrier discharge rod is driven to rotate around the axis of the conductive slide rail by the first self-driving wheel and the second self-driving wheel rotating at the same speed and in opposite directions, thereby ensuring that the dielectric barrier discharge rod can rotate at a uniform speed on the conductive slide rail.

[0012] In an optional embodiment of the present application, the dielectric barrier discharge rod includes: a conductive rod body, which is a cylindrical structure, electrically connected to the conductive slide rail, and can move relative to the conductive slide rail; an insulating cylinder, which is wrapped around the middle of the conductive rod body, is a cylindrical structure, and is coaxially arranged with the conductive rod body, so as to facilitate the uniform distribution of the air gap between the electrodes, effectively enhance the density of charged particles in the pulse discharge, ensure the uniformity and stability of the discharge, and effectively avoid the problem of ceramic insulating medium being easily broken under high pulse thermal stress in the traditional horizontal plate-plate electrode structure, and also avoid the problem of poor discharge stability in the vertical coaxial electrode structure.

[0013] In an optional embodiment of the present application, the insulating cylinder is an alumina ceramic structure with a thickness of 1 to 5 mm to ensure that the physical and chemical properties of the insulating cylinder meet the use requirements.

[0014] In an optional embodiment of the present application, an oxygen storage tank is further included, and an output end of the oxygen storage tank is connected to the inner cavity of the discharge box.

[0015] It is known that the main component of air is nitrogen. The nitrogen-containing free radicals generated by plasma discharge will be transferred to the wastewater, reacting with water molecules to form nitrite and nitrate, which will increase the total nitrogen in the wastewater. To this end, this implementation uses oxygen stored in an oxygen storage tank as the input gas source for the discharge box. On the one hand, the dielectric barrier discharge in an oxygen environment is conducive to converting the streamer discharge into a uniform glow discharge, thereby enhancing the wastewater treatment effect. On the other hand, oxygen provides favorable conditions for the discharge to produce ozone: high-energy electrons in the discharge region bombard oxygen molecules, decomposing them into oxygen atoms. Oxygen atoms and oxygen molecules collide and aggregate with the participation of high-energy particles to form ozone. The ozone can then be reused for secondary purification of the wastewater.

[0016] In an optional embodiment of the present application, an oxygen flow controller is connected between the oxygen storage tank and the discharge box to automatically control the flow of oxygen entering the discharge box.

[0017] In an optional embodiment of the present application, an ozone water tank is further included, which can accommodate wastewater. The air inlet end of the ozone water tank is connected to the inner cavity of the discharge box to introduce the ozone output by the discharge box into the wastewater liquid level in the ozone water tank.

[0018] Thus, the ozone generated in the discharge box is input into the ozone water tank under the action of the output gas pressure of the oxygen storage tank, and is introduced into the wastewater liquid level in the ozone water tank, so that the ozone reacts with the unsaturated functional groups existing in the organic molecules in the wastewater and indirectly reacts with the target pollutants through a free radical chain reaction, thereby achieving the effect of water purification and realizing the recycling of ozone.

[0019] In an optional embodiment of the present application, an ozone flow controller is connected between the ozone water tank and the discharge box to automatically control the flow of oxygen entering the discharge box.

[0020] In an optional embodiment of the present application, the connection between the oxygen storage tank and the discharge box and the connection between the ozone water tank and the discharge box are symmetrical about the center line of the discharge box to ensure that sufficient ozone can be generated.

[0021] In an optional embodiment of the present application, the ozone water tank is adapted to be equipped with a circulation pump; a water inlet pipe is provided at the upper portion of the ozone water tank, the water inlet pipe being connected to the inner cavity of the discharge tank; a water outlet pipe is provided at the lower portion of the ozone water tank, the water outlet pipe being connected to the lower portion of the discharge tank; wherein the circulation pump can drive wastewater to circulate between the discharge tank and the ozone water tank. Thus, wastewater from the discharge tank and the ozone water tank can be interconnected and circulated, promoting wastewater treatment. Maintaining a certain height difference between the water outlet and the water inlet further facilitates overall wastewater circulation, enabling continuous wastewater treatment and improving treatment efficiency, further enhancing the adaptability of the device to large-scale and rapid wastewater treatment needs.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The dielectric barrier discharge wastewater treatment device provided by the present invention includes a discharge box, a dielectric barrier discharge rod, and a pulse power supply. The discharge box can accommodate wastewater and has a conductive electrode installed at the bottom. The dielectric barrier discharge rod is installed in the upper part of the discharge box cavity and can rotate around the center line of the discharge box. The pulse power supply is electrically connected to the dielectric barrier discharge rod and the conductive electrode, respectively. When treating wastewater, the wastewater is directly electrically connected to the conductive electrode, thereby directly using the wastewater as a discharge electrode. When the voltage between the dielectric barrier discharge rod and the wastewater liquid surface exceeds the breakdown voltage, the gas between the dielectric barrier discharge rod and the wastewater liquid surface is broken down to form a dielectric barrier discharge, generating a large number of high-energy electrons, which can effectively purify the water in the discharge box.

[0023] 2. The dielectric barrier discharge wastewater treatment device provided by the present invention has a dielectric barrier discharge rod that can rotate relative to the center line of the discharge box to form a circular sliding stable plasma discharge, realizing a "surface-scanning" plasma water surface discharge. The wastewater serves as a discharge electrode, and the dielectric barrier discharge rod directly discharges the wastewater, which can ensure effective contact between the wastewater and the plasma, thereby quickly and effectively treating the wastewater.

[0024] 3. The dielectric barrier discharge wastewater treatment device provided by the present invention can effectively change the surface tension of the waste liquid facing the discharge position when the dielectric barrier discharge rod rotates, forming a local vortex to drive the internal flow circulation of the liquid and enhance the treatment effect.

[0025] 4. The dielectric barrier discharge wastewater treatment device provided by the present invention realizes "surface-scanning" plasma water surface discharge through the rotation of the dielectric barrier discharge rod, so as to perform uniform large-area discharge. Compared with the plate-shaped dielectric barrier discharge water treatment device, it can avoid the situation where the insulating medium of the dielectric barrier discharge rod is broken under high pulse thermal stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0027] In the attached figure: Figure 1 A schematic diagram of the piping principle of a dielectric barrier discharge wastewater treatment device provided by an embodiment of the present invention; Figure 2 A schematic top view of a discharge box provided in an embodiment of the present invention; Figure 3 A schematic structural diagram of a dielectric barrier discharge rod provided in an embodiment of the present invention; Figure 4 A schematic diagram of the working process of a dielectric barrier discharge wastewater treatment device provided in an embodiment of the present invention.

[0028] Markings and corresponding parts names in the accompanying drawings: 1-discharge box, 2-conductive electrode, 3-dielectric barrier discharge rod, 3a-conductive rod body, 3b-insulating cylinder, 4-pulse power supply, 5-conductive slide rail, 6-first self-driving wheel, 7-second self-driving wheel, 8-oxygen storage tank, 9-oxygen flow controller, 10-ozone water tank, 11-ozone flow controller, 12-circulating pump, 13-water inlet pipe, 14-water outlet pipe, 15-water inlet valve, 16-water outlet valve, 17-air inlet, 18-air outlet. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0030] In the description of the embodiments of the present application, the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the device of the application is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0031] In the description of this application, unless otherwise specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0032] It should be noted that existing plate-shaped dielectric barrier discharge structures struggle to ensure uniform discharge over large areas on a horizontal surface. Furthermore, the plate-shaped structure is susceptible to fracture of the insulating dielectric (typically ceramic) under high pulse thermal stress, making it unsuitable for high-capacity and long-duration wastewater treatment. Furthermore, existing rod-shaped dielectric barrier discharge structures have a shorter electron path in water. Compared to pure gas-phase discharge, the breakdown of bubbles in the liquid is more difficult, and the probability of electron absorption by the wastewater is lower. Most water samples are unable to effectively come into contact with the plasma, resulting in insufficient wastewater treatment capacity and an inability to meet the needs of large-scale wastewater treatment.

[0033] In order to solve the above-mentioned problems, the inventor has innovatively designed the following technical solution, and the specific implementation scheme of this application will be described in detail below with reference to the accompanying drawings. It should be noted that the defects existing in the above-mentioned solutions in the prior art are the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above-mentioned technical problems and the solutions proposed in the following embodiments for the above-mentioned problems should all be the contributions made by the inventor to this application in the process of invention and creation, and should not be understood as technical contents known to those skilled in the art.

[0034] Example Combine Figure 1 This embodiment provides a dielectric barrier discharge wastewater treatment device, including a discharge box 1 capable of containing wastewater and having a conductive electrode 2 installed at the bottom; a dielectric barrier discharge rod 3 installed at the upper part of the inner cavity of the discharge box 1 and capable of rotating around the center line of the discharge box 1; and a pulse power supply 4 electrically connected to the dielectric barrier discharge rod 3 and the conductive electrode 2, respectively.

[0035] It will be appreciated that a cylindrical container is typically used as the discharge chamber 1. During the wastewater purification process, the discharge chamber 1 is sealed to prevent external water vapor contamination and to prevent it from affecting the treatment effect. The conductive electrode 2 only needs to be conductive; its shape is not critical and can be cylindrical or disc-shaped. In this embodiment, a disc is used as the conductive electrode 2 to ensure that the conductive electrode 2 has sufficient working area, ensuring that the wastewater in the discharge chamber 1 can contact the conductive electrode 2.

[0036] For the installation structure of the dielectric barrier discharge rod 3, it is only necessary to ensure that the dielectric barrier discharge rod 3 can rotate around the axis of the discharge box 1. Figure 2 and Figure 3 In this embodiment, a conductive slide rail 5 is installed on the upper part of the inner cavity of the discharge box 1. The conductive slide rail 5 is a circular structure and is coaxial with the discharge box 1 (to ensure that the discharge rod 3 is parallel to the wastewater surface); a first self-driving wheel 6 and a second self-driving wheel 7 are respectively provided at both ends of the dielectric barrier discharge rod 3. The first self-driving wheel 6 and the second self-driving wheel 7 are both adapted to the conductive slide rail 5. The first self-driving wheel 6 and the second self-driving wheel 7 rotate at the same speed and in opposite directions to drive the dielectric barrier discharge rod 3 to rotate around the axis of the conductive slide rail 5, ensuring that the dielectric barrier discharge rod 3 can rotate at a uniform speed on the conductive slide rail 5.

[0037] It is understood that the self-driving wheels, such as brushless electrode-driven wheels, achieve autonomous rotation via an internal power source (e.g., a motor, hydraulics, or mechanical structure). In this embodiment, it is also necessary to ensure that the self-driving wheels can establish an electrical connection between the dielectric barrier discharge rod 3 and the conductive rail 5. The first and second self-driving wheels 6, 7 rotate at the same speed and in opposite directions, ensuring that the dielectric barrier discharge rods perform uniform circumferential motion on the conductive rail 5. This allows the discharge plasma to be in motion, avoiding the treatment of wastewater in a single area. Furthermore, the circumferential motion of the plasma effectively enhances the wastewater treatment effect.

[0038] Typically, the dielectric barrier discharge rod 3 includes: a conductive rod 3a (generally a copper rod), which is a cylindrical structure, electrically connected to the conductive slide rail 5, and can move relative to the conductive slide rail 5; an insulating cylinder 3b, which is coated on the middle part of the conductive rod 3a, is a cylindrical structure, and is coaxially arranged with the conductive rod 3a, so as to facilitate the uniform distribution of the air gap between the electrodes, effectively form filamentary pulse discharge, effectively enhance the charged particle density of the pulse discharge, ensure discharge uniformity and stability, and effectively avoid the problem of ceramic insulating medium breakage easily caused by high pulse thermal stress in the traditional horizontal plate-plate electrode structure, and also avoid the problem of poor discharge stability in the vertical coaxial electrode structure.

[0039] In this embodiment, the insulating cylinder 3b is constructed of alumina ceramic with a thickness of 1 to 5 mm to ensure that its physical and chemical properties meet the required specifications. Alumina ceramic can be replaced with other ceramic insulating materials, such as quartz glass; and the conductive rod 3a can be replaced with other materials with excellent conductivity, such as graphite.

[0040] That is, in this embodiment, the dielectric barrier discharge rod 3 is a horizontal coaxial dielectric barrier discharge structure, specifically including a copper rod, with a tubular alumina ceramic provided on the outer sleeve of the copper rod. The copper rod extends outward from the alumina ceramic by a certain length, and the two are tightly combined to form a stable coaxial structure. The thickness of the alumina ceramic is 1 to 5 mm.

[0041] The aforementioned horizontal coaxial dielectric barrier discharge structure facilitates a uniform distribution of the air gap between the electrodes, effectively increasing the charged particle density during pulse discharge and ensuring discharge uniformity and stability. This effectively avoids the ceramic insulation breakage often associated with high pulse thermal stress in conventional horizontal plate-on-plate electrode structures, as well as the poor discharge stability associated with vertical coaxial electrode structures.

[0042] In addition, the reversing rotating discharge plasma can effectively change the surface tension of the wastewater at the discharge column position, causing a gradient difference in the surface tension of the wastewater, thereby forming a Marangoni effect and forming local vortices. The formation of vortices can drive the internal flow of the liquid, forming a stirring-like effect and increasing treatment efficiency.

[0043] Recombination Figure 1 This embodiment further includes an oxygen storage tank 8 , the output end of which is connected to the inner cavity of the discharge box 1 .

[0044] It is known that the main component of air is nitrogen. The nitrogen-containing free radicals generated by plasma discharge will be transferred to the wastewater, reacting with water molecules to form nitrite and nitrate, which will increase the total nitrogen in the wastewater. To this end, this embodiment uses oxygen stored in oxygen storage tank 8 as the input gas source for discharge box 1. On the one hand, the dielectric barrier discharge in an oxygen environment is conducive to converting the streamer discharge into a uniform glow discharge, thereby enhancing the wastewater treatment effect. On the other hand, oxygen provides favorable conditions for the discharge to produce ozone: high-energy electrons in the discharge area bombard oxygen molecules, decomposing them into oxygen atoms. Oxygen atoms and oxygen molecules collide and polymerize with the participation of high-energy particles to form ozone. The ozone can be reused later to provide secondary purification for the wastewater.

[0045] Generally, an oxygen flow controller 9 is connected between the oxygen storage tank 8 and the discharge box 1 to automatically control the flow of oxygen entering the discharge box 1 .

[0046] On this basis, this embodiment further includes an ozone water tank 10, which can accommodate wastewater. The air inlet end of the ozone water tank 10 is connected to the inner cavity of the discharge box 1 to introduce the ozone output by the discharge box 1 into the wastewater liquid level in the ozone water tank 10.

[0047] Thus, the ozone generated in the discharge box 1 is input into the ozone water tank 10 under the action of the output gas pressure of the oxygen storage tank, and is introduced into the wastewater liquid level in the ozone water tank 10, so that the ozone reacts with the unsaturated functional groups existing in the organic molecules in the wastewater and indirectly reacts with the target pollutants through a free radical chain reaction, thereby achieving the effect of water purification and realizing the recycling of ozone.

[0048] Likewise, an ozone flow controller 11 is connected between the ozone water tank 10 and the discharge box 1 to automatically control the flow of oxygen entering the discharge box 1 .

[0049] The ozone water tank 10 is adapted to be equipped with a circulation pump 12; a water inlet pipe 13 is provided at the upper portion of the ozone water tank 10, and the water inlet pipe 13 is communicated with the inner cavity of the discharge box 1; a water outlet pipe 14 is provided at the lower portion of the ozone water tank 10, and the water outlet pipe 14 is communicated with the lower portion of the discharge box 1; the circulation pump 12 can drive wastewater to circulate between the discharge box 1 and the ozone water tank 10. Thus, the wastewater of the discharge box 1 and the ozone water tank 10 can be interconnected and circulated, promoting wastewater treatment. Moreover, maintaining a certain height difference between the water outlet and the water inlet is more conducive to the overall wastewater circulation, enabling continuous wastewater treatment, improving treatment efficiency, and further enhancing the adaptability of the device to large-scale and rapid sewage treatment needs.

[0050] Recombination Figure 2 The connection between the oxygen storage tank 8 and the discharge box 1 and the connection between the ozone water tank 10 and the discharge box 1 are symmetrical about the center line of the discharge box 1 to ensure that sufficient ozone can be generated.

[0051] Specifically, the top of the discharge box 1 is provided with an air inlet 17 and an air outlet 18, which are arranged symmetrically around the top edge. The air inlet 17 is connected to the oxygen storage tank 8 via a pipe, and the air outlet 18 is connected to the ozone water tank 10 via a pipe. The purpose of the air inlet 17 of the discharge box 1 is to allow oxygen to enter the discharge box 1, and the air outlet 18 is provided to allow ozone to be discharged.

[0052] At the same time, the discharge box 1 is provided with a water inlet on its side, which is higher than the wastewater level and connected to the ozone water tank 10 via an inlet pipe 13. A water outlet is provided at the bottom of the discharge box 1, which is connected to the ozone water tank 10 via an outlet pipe 14. The outlet and the inlet are kept at a certain horizontal distance, thereby achieving intercommunication and circulation of wastewater between the discharge box 1 and the ozone water tank 10, promoting wastewater treatment. Maintaining a certain horizontal distance between the outlet and the inlet further facilitates overall wastewater circulation, enabling continuous wastewater treatment and improving treatment efficiency, making it suitable for large-scale and rapid sewage treatment.

[0053] In this embodiment, an oxygen mass flow controller is provided on the connecting pipe between the oxygen tank and the air inlet 17, and the oxygen mass flow controller can control the flow of oxygen injected into the discharge box 1; an ozone mass flow controller is provided on the connecting pipe between the ozone water tank 10 and the air outlet 18, and the ozone mass flow controller can control the flow of ozone injected into the ozone water tank 10. Thus, by controlling the input flow of oxygen and the output flow of ozone in the discharge box 1, the air pressure balance in the discharge box 1 can be maintained, thereby ensuring the discharge effect; the ozone generated in the discharge box 1 is injected into the wastewater of the ozone water tank 10 under the control of the ozone mass flow controller. Typically, an inlet valve 15 is provided on the pipe connecting the water inlet and the ozone water tank 10. The inlet valve 15 controls the amount of water injected from the ozone water tank 10 into the discharge tank 1. A water outlet valve 16 is provided on the pipe connecting the water outlet and the ozone water tank 10. The outlet valve 16 controls the amount of water injected from the discharge tank 1 into the ozone water tank 10. Thus, the control of the inlet valve 15 and the outlet valve 16 allows the wastewater to maintain fluidity while also maintaining a balanced water level and a stable water surface within the discharge tank 1. This ensures that the discharge gap remains constant during the discharge process, preventing the discharge effect from being affected by fluctuations in the water level.

[0054] It should be noted that the cathode of the high-voltage pulse power supply 4 is connected to the conductive slide rail 5 through a wire, and the anode of the high-voltage pulse power supply 4 is connected to the conductive electrode 2 through a wire. The high-voltage pulse power supply 4 can provide a voltage of 10-40kV, a frequency of 5-20kHz, and a pulse width of 1-50μs. In other words, the high-voltage pulse power supply 4 is used to provide a plasma power supply with adjustable frequency, voltage, and pulse width, which can effectively reduce operating energy consumption, achieve a high-voltage and low-current efficient discharge mode, and improve the energy utilization efficiency of the device. The use of the high-voltage pulse power supply 4 prevents heavier ions from moving in a short period of time, which can effectively inhibit the process of ions absorbing energy and being absorbed by the cathode to generate heat energy.

[0055] In summary, the dielectric barrier discharge wastewater treatment device provided in this embodiment includes a discharge box 1, a dielectric barrier discharge rod 3, a pulse power supply 4, an oxygen storage tank 8 and an ozone water tank 10. The discharge box 1 can accommodate wastewater and has a conductive electrode 2 installed at the bottom. The dielectric barrier discharge rod 3 is installed in the upper part of the inner cavity of the discharge box 1 and can rotate around the center line of the discharge box 1. The pulse power supply 4 is electrically connected to the dielectric barrier discharge rod 3 and the conductive electrode 2 respectively.

[0056] When treating wastewater, the wastewater is placed in the discharge box 1, and then the dielectric barrier discharge rod 3 and the conductive electrode 2 are powered by the pulse power supply 4. Since the conductive electrode 2 is installed at the bottom of the inner cavity of the discharge box 1, and the wastewater has a high conductivity, it is directly electrically connected to the conductive electrode 2, so that the wastewater is directly used as a discharge electrode. When the voltage between the dielectric barrier discharge rod 3 and the wastewater liquid surface exceeds the breakdown voltage, the gas between the dielectric barrier discharge rod 3 and the wastewater liquid surface is broken down to form a dielectric barrier discharge, generating a large number of high-energy electrons. The high-energy electrons collide with water molecules and oxygen molecules, generating a corresponding series of physical and chemical effects, including strong oxidizing active particles, shock waves and ultraviolet light. The plasma generated by the dielectric barrier discharge will destroy the chemical bonds of organic pollutants in the water, degrade organic macromolecular pollutants, and ultimately purify the water in the discharge box 1. The specific operation process is as follows: S1. Reset: Open the discharge box 1, all valves and gas mass flow controllers are closed, and all electrical equipment are turned off; S2, open the water inlet valve 15; S3, injecting wastewater into the ozone water tank 10; S4, determine whether the wastewater in the discharge box 1 has reached the preset water level line, if so, go to step S5; if not, return to S3; S5, close the water inlet valve 15; S6, determine whether the wastewater in the ozone water tank 10 has reached the preset water level line, if so, go to step S7; if not, return to S3; S7, start the circulation pump 12, adjust and open the water inlet valve 15 and the water outlet valve 16 to keep the water inlet and outlet water volumes the same, and realize water circulation; S8, determine whether the water surface of the discharge box 1 is stable, if so, go to step S9; if not, return to step S7 and adjust the water flow of the valve; S9. Set the discharge voltage of the high-voltage pulse power supply 4 to 10-40 kV, the frequency to 5-20 kHz, and the pulse width to 1-50 μs. It should be noted that the voltage determines the degree of discharge, and the power frequency determines the number of discharges in the same time. Excessive voltage may cause local dielectric breakdown and accelerate electrode corrosion, and excessively high voltage does not improve energy efficiency. When the frequency exceeds a limit, the discharge space cannot provide more electrons and ions in a timely manner, the discharge reaches a saturated state, and the plasma density generated in the space reaches an extreme value. At this time, the energy input to the system is converted more into heat energy or kinetic energy, causing severe heating of the electrode and violent oscillation of the solution, which is not conducive to the degradation of organic matter. S10, start the high voltage pulse power supply 4; S11, determining whether a uniform discharge plasma is formed between the dielectric barrier discharge rod and the wastewater; if so, sealing the discharge box 1 and proceeding to step S12; if not, returning to step S9 and adjusting the discharge parameters of the high-voltage pulse power supply 4; S12, simultaneously turning on the oxygen mass flow controller and the ozone mass flow controller and keeping the gas flow parameters controlled by the two the same; S13, starting the electronic control device, controlling the rotation speed and rotation direction of the first self-driving wheel 6 and the second self-driving wheel 7 by the electronic control device, and setting the driving time so that the first self-driving wheel 6 and the second self-driving wheel 7 rotate at the same speed and in opposite directions within a certain period of time; S14: After the preset driving time is reached, the process ends. All electrical devices are turned off, all valves and gas mass flow controllers are closed, and wastewater treatment is completed.

[0057] The dielectric barrier discharge rod 3 rotates relative to the centerline of the discharge chamber 1 to form a stable, circularly sliding plasma discharge, achieving a "surface-sweeping" plasma water-surface discharge. The wastewater serves as the discharge electrode, and the dielectric barrier discharge rod 3 directly discharges into the wastewater, ensuring effective contact between the wastewater and the plasma, thereby rapidly and effectively treating the wastewater. Furthermore, the rotation of the dielectric barrier discharge rod 3 effectively alters the surface tension of the wastewater directly facing the discharge position, forming localized vortices that drive internal liquid circulation and enhance the treatment effect. The discharge gap can be controlled by adjusting the wastewater level, offering high operability and feasibility. The reaction time can be arbitrarily controlled, achieving long-term wastewater treatment.

[0058] At the same time, through the rotation of the dielectric barrier discharge rod 3, "surface scanning" plasma water surface discharge is realized to perform uniform large-area discharge. Compared with the plate-shaped dielectric barrier discharge water treatment device, it can avoid the situation where the insulating medium of the dielectric barrier discharge rod 3 is broken under high pulse thermal stress.

[0059] In summary, the dielectric barrier discharge wastewater treatment device provided in this embodiment realizes "surface scanning" plasma water surface discharge through the circular uniform motion of the dielectric barrier discharge rod 3, and has the characteristics of high treatment efficiency and high treatment efficiency, which meets the needs of large-capacity wastewater treatment. At the same time, by performing plasma discharge on the surface of circulating wastewater and utilizing the ozone generated by the discharge to synergistically treat the wastewater, the wastewater treatment effect is enhanced.

[0060] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dielectric barrier discharge wastewater treatment device, characterized in that: include: A discharge box (1) capable of containing wastewater and having a conductive electrode (2) mounted on the bottom; A dielectric barrier discharge rod (3) is mounted on the upper portion of the inner cavity of the discharge box (1) and is capable of rotating around the center line of the discharge box (1); A pulse power supply (4) is electrically connected to the dielectric barrier discharge rod (3) and the conductive electrode (2), respectively.

2. The dielectric barrier discharge wastewater treatment device according to claim 1, characterized in that: A conductive slide rail (5) is installed on the upper part of the inner cavity of the discharge box (1); the conductive slide rail (5) is a circular ring structure, and the conductive slide rail (5) is coaxially arranged with the discharge box (1); A first self-driving wheel (6) and a second self-driving wheel (7) are provided at both ends of the dielectric barrier discharge rod (3), and the first self-driving wheel (6) and the second self-driving wheel (7) are both adapted to the conductive slide rail (5), so that the dielectric barrier discharge rod (3) is driven to rotate around the axis of the conductive slide rail (5) by the first self-driving wheel (6) and the second self-driving wheel (7) rotating in opposite directions at the same speed.

3. The dielectric barrier discharge wastewater treatment device according to claim 2, characterized in that: The dielectric barrier discharge rod (3) comprises: The conductive rod (3a) is a cylindrical structure, electrically connected to the conductive slide rail (5), and is movable relative to the conductive slide rail (5); The insulating cylinder (3b) is wrapped around the middle of the conductive rod (3a), has a cylindrical structure, and is coaxially arranged with the conductive rod (3a).

4. The dielectric barrier discharge wastewater treatment device according to claim 3, characterized in that: The insulating cylinder (3b) is an alumina ceramic structure with a thickness of 1 to 5 mm.

5. The dielectric barrier discharge wastewater treatment device according to claim 1, characterized in that: It also includes an oxygen storage tank (8), the output end of which is in communication with the inner cavity of the discharge box (1).

6. The dielectric barrier discharge wastewater treatment device according to claim 5, characterized in that: An oxygen flow controller (9) is connected between the oxygen storage tank (8) and the discharge box (1).

7. The dielectric barrier discharge wastewater treatment device according to claim 5, characterized in that: It also includes an ozone water tank (10), which can accommodate wastewater. The air inlet end of the ozone water tank (10) is connected to the inner cavity of the discharge box (1) so as to guide the ozone output by the discharge box (1) into the wastewater liquid level in the ozone water tank (10).

8. The dielectric barrier discharge wastewater treatment device according to claim 7, characterized in that: An ozone flow controller (11) is connected between the ozone water tank (10) and the discharge box (1).

9. The dielectric barrier discharge wastewater treatment device according to claim 7, characterized in that: The connection between the oxygen storage tank (8) and the discharge box (1) and the connection between the ozone water tank (10) and the discharge box (1) are symmetrical about the center line of the discharge box (1).

10. The dielectric barrier discharge wastewater treatment device according to claim 7, characterized in that: The ozone water tank (10) is adapted to be equipped with a circulation pump (12); A water inlet pipe (13) is provided on the upper portion of the ozone water tank (10), and the water inlet pipe (13) is communicated with the inner cavity of the discharge box (1); A water outlet pipe (14) is provided at the lower portion of the ozone water tank (10), and the water outlet pipe (14) is communicated with the lower portion of the discharge box (1); The circulating pump (12) can drive the wastewater to circulate between the discharge box (1) and the ozone water tank (10).

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