A device for degrading wastewater based on dielectric barrier discharge coupled optical waveguide catalysis

Abstract

The application discloses a wastewater degradation device based on dielectric barrier discharge coupling optical waveguide catalysis, which comprises a reactor, a liquid circulating system and a power supply. The reactor is used for degrading and treating the wastewater delivered by the liquid circulating system. The reactor comprises a red copper rod, a ceramic medium and an outer tube. The red copper rod and the ceramic medium are arranged in the outer tube. The ceramic medium and the outer tube form a plasma discharge area. The upper end of the outer tube is provided with an upper cover. The upper cover and the outer tube form a liquid inlet channel. The liquid inlet channel is communicated with the plasma discharge area. The power supply is electrically connected with the reactor. The red copper rod is used for forming a high-voltage electric field in the plasma discharge area. When the wastewater passes through the plasma discharge area, active substances generated by dielectric barrier discharge can degrade the wastewater. The circulating liquid system is used for delivering the degraded wastewater into the reactor again for secondary degradation. Through the above device, the wastewater can be cyclically degraded and treated, and the degradation effect of the wastewater is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of wastewater treatment, in particular to a wastewater degradation device based on dielectric barrier discharge coupling light waveguide catalysis. BACKGROUND

[0002] Domestic sewage refers to the wastewater discharged in daily life activities, which is mainly polluted by domestic waste and human excreta. The quantity, composition and concentration of pollutants are related to people's living habits and water consumption. Domestic sewage generally does not contain toxic substances, but it has conditions suitable for the reproduction of microorganisms, contains a large number of bacteria and pathogens, and is harmful from the health point of view. Therefore, this kind of wastewater needs to be treated. The wastewater treatment in the prior art generally uses physical, chemical and biological methods to treat wastewater, purifies wastewater, reduces pollution, and achieves wastewater recycling, reuse and full utilization of water resources. However, the above three wastewater treatment methods have the problems of long treatment cycle, secondary pollution in the treatment process, and ineffective treatment of refractory organic matter in wastewater. SUMMARY

[0003] In order to solve the problems of long treatment cycle, secondary pollution in the treatment process and ineffective treatment of refractory organic matter in wastewater of the wastewater treatment method in the prior art, the application provides a wastewater degradation device based on dielectric barrier discharge coupling light waveguide catalysis, which can improve energy utilization rate by dielectric barrier discharge coupling light waveguide catalysis TiO2 light, generate more hydroxyl radicals with higher oxidation potential to remove various refractory organic matter in wastewater.

[0004] To achieve the above purpose, the technical scheme adopted by the application is as follows: a wastewater degradation device based on dielectric barrier discharge coupling light waveguide catalysis, comprising a reactor for degrading and treating wastewater, the reactor comprising a red copper rod, a ceramic medium and an outer pipe, the outer pipe being a hollow structure, the red copper rod and the ceramic medium being arranged in the outer pipe, the ceramic medium being sleeved on the outside of the red copper rod, the outer diameter of the ceramic medium being smaller than the inner diameter of the outer pipe, a plasma discharge zone being formed between the ceramic medium and the outer pipe, an upper end of the outer pipe being provided with an upper cover, the upper cover and the outer pipe being surrounded to form a liquid inlet channel, a plurality of liquid inlet holes being arranged on the outer pipe, one end of the plurality of liquid inlet holes being communicated with the liquid inlet channel, and the other end of the liquid inlet hole being communicated with the plasma discharge zone.

[0005] A liquid circulation system comprising a container for containing wastewater and disposed directly below the reactor, and a circulation pump adapted to deliver liquid in the container to the liquid inlet channel through a pipe, the plasma discharge zone being aligned with the container, and the wastewater degraded through the plasma discharge zone being able to flow back into the container;

[0006] A power supply electrically connected to the reactor, adapted to form a high-voltage electric field in the plasma discharge zone through the copper rod.

[0007] As a further improvement of the above-mentioned solution, the ceramic medium is made of a mixture of gypsum board, fused quartz and titanium dioxide particles.

[0008] As a further improvement of the above-mentioned solution, a base is provided on the reactor, the base being mounted on the lower end of the reactor, a plurality of liquid outlet holes being provided on the base, one end of each of the liquid outlet holes being communicated with the plasma discharge zone, and the other end of each of the liquid outlet holes facing the container.

[0009] As a further improvement of the above-mentioned solution, the wastewater degradation device further comprises a gas supply system, the gas supply system comprising a gas pump, a flow meter and a gas path pipe, the flow meter being provided on the gas path pipe, one end of the gas path pipe being communicated with the gas pump, and the other end of the gas path pipe being communicated with the plasma discharge zone, so that the gas can pressurize and drive the reaction solution into the plasma discharge zone.

[0010] As a further improvement of the above-mentioned solution, the power supply comprises a power supply body, a voltage regulator and an oscilloscope, the positive pole of the power supply body being connected to the copper rod, the ground pole of the power supply body being connected to the outer pipe, the voltage regulator being adapted to adjust the voltage of the power supply body through self-coupling adjustment, and the oscilloscope being adapted to monitor the operating state of the power supply.

[0011] As a further improvement of the above-mentioned solution, a mounting plate is provided on the outer pipe, the upper cover being invertedly buckled to the mounting plate, and the liquid inlet hole being provided above the mounting plate.

[0012] As a further improvement of the above-mentioned solution, the outer pipe is a stainless steel pipe.

[0013] As a further improvement of the above-mentioned solution, a first connecting pipe and a second connecting pipe are provided on the upper cover, the height of the first connecting pipe being higher than the height of the second connecting pipe, one end of the first connecting pipe being communicated with the liquid inlet channel, the other end of the first connecting pipe being communicated with the gas path pipe, one end of the second connecting pipe being connected to the circulation pump, the other end of the second connecting pipe being communicated with the liquid inlet channel, an air vent hole being provided on the outer pipe, the air vent hole being respectively communicated with the liquid inlet channel and the plasma discharge zone, and the air vent hole being aligned with the first connecting pipe.

[0014] As a further improvement of the above-mentioned solution, the width of the plasma discharge zone is greater than the diameter of the liquid outlet hole.

[0015] As a further improvement of the above-mentioned solution, the diameter of the liquid inlet hole is 1mm-3mm.

[0016] Further, the diameter of the liquid inlet hole is 2mm.

[0017] Further, the preparation method of the ceramic medium comprises the following steps:

[0018] S1, 6 parts by weight of titanium dioxide and 10 parts by weight of fused quartz are added to 16 parts by weight of deionized water, and then the mixture is ball milled for 4 hours to obtain a uniform slurry;

[0019] S2, the slurry in step S1 is poured into a gypsum board, dried at room temperature for 3 hours, and then dried at 50℃ for 8 hours;

[0020] S3, the sample of step S2 is transferred to a furnace, heated to 550℃ at a speed of 5℃ per minute, and kept at 550℃ for 2 hours, and then the melted sample is shaped to obtain the ceramic medium.

[0021] Compared with the prior art, the beneficial effects of the present application are:

[0022] (1) The present application supplies power to the red copper rod in the reactor through the power supply, the red copper rod is subjected to pulse power injection to generate high pressure and release high-energy electrons, the electrons will be hindered by the ceramic medium when moving downward, so that the electrons gather on the ceramic medium, when the electric field intensity of the plasma discharge zone reaches enough to break through the surrounding gas, and the electron density of the plasma discharge zone reaches the critical value, a large amount of short-lived current filaments will be generated, at this time, air is ionized and broken down to produce ozone, active oxygen and ultraviolet light, these active substances can attack pollutants (including organic matter) in wastewater, so that the pollutants are decomposed into harmless small molecular substances, thereby realizing the degradation operation of the wastewater, the whole degradation process is simple to operate, without secondary pollution, and the degradation efficiency is high.

[0023] (2) The ultraviolet light generated by ionization in the present application enters the ceramic medium, and there are titanium dioxide particles in the ceramic medium, the titanium dioxide particles are catalyzed by the ultraviolet light to generate high-concentration hydroxyl radicals, and the ceramic medium itself also ionizes the gas to produce active oxygen substances, both of which can act on the pollutants in the wastewater, so that the pollutants are decomposed into small molecular non-toxic substances.

[0024] (3) The device couples the ceramic medium barrier discharge with the titanium dioxide photocatalyst, which can improve the utilization rate of electrons and light energy.

[0025] (4) The ceramic medium of the present application contains titanium dioxide particles and fused quartz, and the ultraviolet light irradiation forms an ultraviolet region, the refractive index of the fused quartz in the ultraviolet region is low, about 1.5, while the refractive index of titanium dioxide is 2.5. Due to the difference in refractive index of the two materials, a refractive channel can be formed in the ceramic medium, and the ultraviolet light can pass through the refractive channel to the greatest extent to enter the ceramic medium to catalyze the nano titanium dioxide particles, thereby improving the utilization rate of ultraviolet light. At the same time, the nano titanium dioxide particles are catalyzed by ultraviolet light to generate high-concentration hydroxyl radicals, further improving the degradation efficiency of pollutants in wastewater.

[0026] (5) The wastewater degradation device of the present application can accelerate the generation of active substances, improve the concentration of active substances, and further improve the degradation efficiency of pollutants in wastewater.

[0027] (6) The wastewater degradation device of the present application can improve the energy utilization rate of the ceramic medium barrier discharge and reduce the energy consumption cost in the wastewater treatment process. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the front view of the reactor provided in the present application.

[0029] Figure 2 It is the top view of the reactor provided in the present application.

[0030] Figure 3 It is the cross-sectional view along A-A in the present application. Figure 2

[0031] Figure 4 It is the enlarged schematic view of B in the present application. Figure 3

[0032] Figure 5 It is the schematic view of the wastewater degradation device based on medium barrier discharge coupled with optical waveguide catalysis provided in the present application.

[0033] In the figure: 1, reactor; 11, red copper rod; 12, ceramic medium; 13, outer tube; 131, upper cover; 132, liquid inlet channel; 133, liquid inlet hole; 134, mounting plate; 135, connecting pipe one; 136, connecting pipe two; 137, air hole; 14, plasma discharge area; 15, base; 151, liquid outlet hole; 2, liquid circulation system; 21, container; 22, circulating pump; 3, power supply; 31, power supply body; 32, voltage regulator; 33, oscilloscope; 4, gas supply system; 41, gas pump; 42, flow meter; 43, gas path pipe. DETAILED DESCRIPTION

[0034] ​​Hereinafter, the present application will be further described with reference to the specific embodiments, it should be noted that, in the absence of conflict, the following described embodiments or technical features between each of the combination can form a new embodiment.

[0035] In the description of the present application, it should be noted that, for orientation words, such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application. The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily describe a particular order or sequence. The terms "include" and "have" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] Reference Figures 1-5As shown, one embodiment of the present application provides a wastewater degradation device based on dielectric barrier discharge coupled optical waveguide catalysis, which comprises a reactor 1, a liquid circulating system 2 and a power supply 3. The liquid circulating device is connected to the reactor 1 and is suitable for conveying wastewater to be treated into the reactor 1. The power supply 3 is electrically connected to the reactor 1 and is suitable for powering the reactor 1. The reactor 1 is used for degradation treatment of wastewater, and the treated wastewater can flow back into the liquid circulating device from the lower end of the reactor 1 and then be conveyed into the reactor 1 for degradation treatment by the liquid circulating device. The above device can realize the cyclic degradation treatment of wastewater and improve the degradation effect of wastewater. The reactor 1 comprises a red copper rod 11, a ceramic medium 12 and an outer tube 13. The outer tube 13 is a hollow structure, and the red copper rod 11 and the ceramic medium 12 are arranged in the outer tube 13. The ceramic medium 12 is sleeved outside the red copper rod 11, and the outer diameter of the ceramic medium 12 is smaller than the inner diameter of the outer tube 13. The plasma discharge area 14 is formed between the ceramic medium 12 and the outer tube 13. The upper end of the outer tube 13 is provided with an upper cover 131, and the upper cover 131 and the outer tube 13 form a liquid inlet channel 132 therebetween. The outer tube 13 is provided with a plurality of liquid inlet holes 133, one end of the liquid inlet holes 133 communicates with the liquid inlet channel 132, and the other end of the liquid inlet holes 133 communicates with the plasma discharge area 14. The liquid circulating system 2 comprises a container 21 and a circulating pump 22. The container 21 is used for containing wastewater and is arranged directly below the reactor 1. The arrangement of the container 21 directly below the reactor 1 facilitates the backflow of wastewater degraded by the reactor 1 into the container 21. The circulating pump 22 is suitable for conveying the liquid in the container 21 to the liquid inlet channel 132 through a pipeline. The plasma discharge area 14 is aligned with the container 21, and the wastewater degraded by the plasma discharge area 14 can flow back into the container 21. The arrangement of the liquid circulating system 2 can realize the cyclic degradation of the water in the container 21 and greatly improve the degradation effect of the entire device on wastewater. The power supply 3 is electrically connected to the reactor 1 and is suitable for forming a high-voltage electric field in the plasma discharge area 14 by the red copper rod 11. Specifically, one end of the power supply 3 is connected to the red copper rod 11 in the reactor 1 as a positive electrode, and the grounding electrode is connected to the outer tube 13 in the reactor 1 as a grounding electrode. When the wastewater passes through the plasma discharge area 14, the red copper rod 11 in the reactor 1 receives pulse power injection and can generate a voltage as high as 30kV, releasing high-energy electrons. The electrons encounter the obstruction of the ceramic medium 12 during the movement to the grounding electrode, and the electrons gather on the ceramic medium 12. When the electric field strength of the plasma discharge area 14 reaches a value sufficient to break through the surrounding gas, the electron density of the area will reach a critical value, generating a large number of short-lived current filaments. The air is ionized and broken down to produce ozone, active oxygen and ultraviolet light.The titanium dioxide nanoparticles are wrapped in the ceramic medium 12, there are a large number of porous channels, there is fused quartz in the gap between the particles, and part of the fused quartz covers the interface of the ceramic medium 12. Ultraviolet light can enter the inside of the ceramic medium 12 through the fused quartz, and be absorbed by the internal titanium dioxide nanoparticles under the action of light refraction. The titanium dioxide is catalyzed by ultraviolet light to produce high-concentration hydroxyl radicals. The dielectric barrier discharge itself also ionizes the gas to produce reactive oxygen species, which act together on the pollutants in the solution to mineralize the pollutants into small molecules of non-toxic substances, thereby realizing the degradation of various difficult-to-degrade organic matter in wastewater. The entire degradation process is simple to operate, short in processing cycle, and does not cause secondary pollution during the degradation process.

[0037] In the application, a plurality of liquid inlet holes 133 are arranged on the outer tube 13, and the liquid inlet holes 133 are circumferentially distributed on the outer tube 13, so that the wastewater can form a liquid film through the liquid inlet holes 133 and enter the plasma discharge area 14. The circumferential distribution of the liquid inlet holes 133 can ensure that the liquid film entering the plasma discharge area 14 is uniformly distributed, so that the active substances generated by the dielectric barrier discharge can be in sufficient contact with the wastewater, and the degradation efficiency is improved.

[0038] As shown in FIG. 1, the liquid circulating system 2 further comprises a container 21, a circulating pump 22, and an outer tube 13. Figure 5 As shown in FIG. 1, the liquid circulating system 2 further comprises a container 21, a circulating pump 22, and an outer tube 13.

[0039] Preferably, the circulating pump 22 is a peristaltic pump.

[0040] The ceramic medium 12 is made of gypsum board, fused quartz and titanium dioxide particles. The ceramic medium 12 blocks the ultraviolet light generated by the discharge from entering the ceramic medium 12 and catalyzes the titanium dioxide particles inside. When the titanium dioxide is irradiated by ultraviolet light with energy exceeding its band gap width, the activated electrons jump to the conduction band, thereby generating highly reducing electrons in the conduction band and oxidizing holes in the valence band. The electron-hole pair has strong oxidation-reduction properties. The holes react with water to generate hydroxyl radicals. The ceramic medium 12 blocks most of the ultraviolet light generated by the discharge, which can be used to catalyze the titanium dioxide, thereby increasing the proportion of hydroxyl radicals in the entire reactor 1. The hydroxyl radicals can react with target pollutants, thereby improving the treatment effect of the wastewater degradation device on wastewater and improving the energy utilization efficiency of the wastewater treatment process. In the present application, fused quartz and titanium dioxide particles are added to the ceramic medium 12, and an ultraviolet region is formed by ultraviolet irradiation. The refractive index of fused quartz in the ultraviolet region is low, i.e. 1.5, while the refractive index of titanium dioxide is 2.5. Due to the difference in refractive index of the two materials, a refraction channel can be formed in the ceramic medium 12. Ultraviolet light can enter the interior of the ceramic medium 12 through the refraction channel to catalyze the nano-titanium dioxide particles, thereby improving the utilization rate of ultraviolet light. At the same time, the nano-titanium dioxide particles are catalyzed by ultraviolet light to generate a high concentration of hydroxyl radicals, thereby further improving the efficiency of degrading pollutants in wastewater.

[0041] The preparation process of the ceramic medium is as follows: (1) 6 g of titanium dioxide and 10 g of fused quartz are added to 16 mL of deionized water, and then the mixture is ball milled for 4 hours to obtain a uniform slurry; (2) the slurry in step (1) is poured into a gypsum board, dried at room temperature for 3 hours, and then dried at 50℃ for 8 hours; (3) the sample in step (2) is transferred to a furnace and heated to 550℃ at a rate of 5℃ per minute, and then kept at 550℃ for 2 hours. The molten sample is shaped to obtain the ceramic medium.

[0042] In the actual degradation process, the wastewater in the container 21 can be periodically sampled, and the concentration of the target pollutants in the sampled wastewater can be measured by an instrument.

[0043] The instrument for detecting the concentration of the sampled wastewater generally uses an ultraviolet-visible spectrophotometer for measurement. For complex organic matter such as antibiotics, a liquid chromatograph can also be used for measurement.

[0044] The ultraviolet-visible spectrophotometer is an analytical instrument based on the principle of ultraviolet-visible light photometry, which uses the radiation absorption of substance molecules in the ultraviolet-visible spectral region for analysis. A solution of a target substance with a certain concentration is prepared, and the ultraviolet-visible spectrophotometer is used to scan it within a certain light wave range to determine the maximum absorption of the substance at a specific wavelength, and the concentration of the substance at the wavelength is measured. A standard substance solution with a concentration gradient in a certain range is prepared and its absorbance is measured, and a standard curve is drawn by linear regression of the substance concentration and the absorbance to obtain the relationship between the substance and the absorbance. Before degradation starts, the absorbance of the target substance is determined, and its concentration C0(mg / L) is calculated, where C0represents the concentration of pollutants in wastewater before degradation. During the degradation process, the target pollutant in the solution is sampled every fixed time, and its absorbance is measured, and its concentration is calculated as Ct(mg / L), where C t t represents the concentration of pollutants in wastewater at this moment, and the degradation rate η(%) is calculated by the following formula: η(%) = (C0-C t ) / C0×100. In actual operation, when the degradation rate calculated reaches more than 90%, it means that the wastewater treatment has reached the standard, and at this time the degradation treatment of wastewater can be stopped.

[0045] As shown in Figure 3 and Figure 5 , the reactor 1 is provided with a base 15 installed at the lower end of the reactor 1, and the base 15 is provided with a plurality of liquid outlet holes 151, one end of each liquid outlet hole 151 communicating with the plasma discharge area 14, and the other end of each liquid outlet hole 151 facing the container 21. In this application, the base 15 can serve as a liquid storage and leakage and fix the copper rod 11 and the ceramic medium 12. By providing the liquid outlet holes 151, the wastewater degraded by the plasma discharge area 14 can flow back into the container 21 through the liquid outlet holes 151, and then be transported to the liquid inlet channel 132 by the circulating pump 22, and then enter the plasma discharge area 14 for secondary degradation. Through this cyclic degradation, the refractory organic matter in the wastewater can be effectively degraded.

[0046] As shown in Figure 5As shown, the wastewater degradation device further comprises a gas supply system 4, which comprises a gas pump 41, a flow meter 42 and a gas path pipe 43. The flow meter 42 is arranged on the gas path pipe 43, one end of the gas path pipe 43 is communicated with the gas pump 41, and the other end of the gas path pipe 43 is communicated with the plasma discharge area 14. The gas is pressurized to drive the reaction solution into the plasma discharge area 14. By arranging the flow meter 42, the flow of the gas entering the reactor 1 can be accurately controlled. In the present application, by arranging the gas supply system 4, the reaction solution can be driven into the plasma discharge area 14 by pressurization, and the dielectric barrier discharge can also generate active substances such as free radicals, ozone and hydrogen peroxide with high oxidation potential in the gas-liquid two-phase (i.e. air and water) to attack pollutants, thereby accelerating the generation of active substances, increasing the concentration of active substances, and decomposing the pollutants into harmless small molecular substances, thereby further improving the efficiency of effectively degrading the pollutants in the wastewater. In addition, by introducing the gas through the gas supply system 4, the energy utilization rate of the dielectric barrier discharge can be improved, and the energy consumption cost can be reduced.

[0047] The power supply 3 comprises a power supply body 31, a voltage regulator 32 and an oscilloscope 33. The positive pole of the power supply body 31 is connected to the copper rod 11, and the ground pole of the power supply body 31 is connected to the outer tube 13. The voltage regulator 32 adjusts the voltage of the power supply body 31 through self-coupling adjustment. The oscilloscope 33 is suitable for monitoring the operating state of the power supply 3. The power supply body 31 adopts a 220V low-temperature plasma experiment power supply 3. The peak voltage adjustment range of the power supply 3 is 0-30kV, and the frequency adjustment range is 5-20kV. During the voltage adjustment process, the indicator light on the panel of the power supply body 31 can be observed. When the indicator light is always flashing, it means that the discharge is not stable at this voltage. Only when the indicator light is always on, it means that the discharge in the reactor 1 is stable. In the experiment of the present application, stable discharge starts when the voltage is increased to 12kV. In addition, during the degradation process, the discharge parameters in the power supply 3 can be monitored in real time through the oscilloscope 33, such as input voltage, output waveform and discharge frequency.

[0048] During the wastewater degradation process, wastewater is first introduced, then air is introduced, the liquid is circulated, and then the power supply 3 is turned on. The voltage is increased from 0kV until the discharge is stable and the degradation starts. The advantage of first introducing wastewater and then introducing electricity is that there is no energy loss and no damage to the copper rod 11. If the discharge is first introduced during the experiment, the reactor 1 will have energy loss and be easy to cause damage to the copper rod 11.

[0049] As Figure 3 and Figure 4As shown, the outer tube 13 is provided with a mounting plate 134, and the upper cover 131 is invertedly buckled to the mounting plate 134, and the liquid inlet hole 133 is arranged above the mounting plate 134. By arranging the mounting plate 134, the upper cover 131 can be mounted, so that the upper cover 131 and the reactor 1 can be designed as a separable structure, which facilitates the disassembly, cleaning or replacement of the upper cover 131. By arranging the liquid inlet hole 133 above the mounting plate 134, the flow rate of the wastewater entering the plasma discharge area 14 through the liquid inlet hole 133 can be controlled. The purpose of controlling the flow rate is to increase the time of the wastewater passing through the plasma discharge area 14 at a low flow rate, so that the active substances generated by the dielectric barrier discharge can fully contact the wastewater, thereby improving the degradation effect of the plasma discharge area 14 on the wastewater.

[0050] The outer tube 13 is a stainless steel tube, which can be connected with the grounding electrode of the power body 31 to form a grounding electrode, so that the copper rod 11 can generate a voltage as high as 30kV when subjected to pulse power injection, and release high-energy electrons. The electrons move to the grounding electrode and encounter the obstruction of the ceramic medium 12. The electrons gather on the ceramic medium 12. When the electric field strength of the plasma discharge area 14 reaches a sufficient value to break through the surrounding gas, the electron density of the area reaches a critical value, a large number of short-lived current filaments are generated, and air is ionized and broken down to generate ozone, active oxygen and ultraviolet light.

[0051] As shown in Figure 4 and Figure 5 As shown, the upper cover 131 is provided with a connecting pipe one 135 and a connecting pipe two 136, the height of the connecting pipe one 135 is higher than that of the connecting pipe two 136, the connecting pipe one 135 is a gas inlet pipe, and the connecting pipe two 136 is a liquid inlet pipe. By arranging the height of the connecting pipe one 135 above the connecting pipe two 136, the gas can be pressurized to drive the liquid into the plasma discharge area 14, thereby improving the degradation rate. One end of the connecting pipe one 135 is communicated with the liquid inlet channel 132, the other end of the connecting pipe one 135 is communicated with the gas path pipe 43, one end of the connecting pipe two 136 is connected with the circulating pump 22, the other end of the connecting pipe two 136 is communicated with the liquid inlet channel 132, the outer tube 13 is provided with a vent hole 137, the vent hole 137 is respectively communicated with the liquid inlet channel 132 and the plasma discharge area 14, and the vent hole 137 is aligned with the connecting pipe one 135. By arranging the vent hole 137, air can enter the plasma discharge area 14 through the vent hole 137, so that the oxygen in the air reacts with the high-energy electrons generated by the dielectric barrier discharge to generate ozone. As an active substance, ozone can also degrade refractory organic matter in wastewater, thereby greatly improving the degradation effect on wastewater.

[0052] In some embodiments, the reactor 1 adopts a coaxial cylinder electrode structure, wherein the copper rod 11 is a cylindrical structure with a length of 300 mm and an inner diameter of 10 mm, the ceramic medium 12 is a hollow cylindrical structure with a length of 260 mm and an inner diameter of 12 mm, and the outer tube 13 is a hollow cylindrical structure with a length of 200 mm and an inner diameter of 18 mm.

[0053] The width of the plasma discharge area 14 is greater than the diameter of the liquid outlet hole 151, so that the wastewater degraded by the plasma discharge area 14 can enter the container 21 through the liquid outlet hole 151 and then be secondarily circulated and degraded by the circulating pump 22.

[0054] Preferably, the hole diameter of the liquid inlet hole 133 is 1 mm to 3 mm.

[0055] Preferably, the hole diameter of the liquid inlet hole 133 is 2 mm.

[0056] The above describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A device for degradation of wastewater based on dielectric barrier discharge coupled optical waveguide catalysis, characterized in that, It includes: The reactor (1) is used for degradation treatment of wastewater, the reactor (1) includes red copper stick (11), ceramic medium (12) and outer tube (13), the outer tube (13) is hollow structure, the red copper stick (11) and the ceramic medium (12) are all arranged in the outer tube (13), the ceramic medium (12) is sleeved on the outside of the red copper stick (11), the outer diameter of the ceramic medium (12) is less than the inner diameter of the outer tube (13), the plasma discharge area (14) is formed between the ceramic medium (12) and the outer tube (13), the upper end of the outer tube (13) is provided with upper cover (131), the upper cover (131) is surrounded with the outer tube (13) to form liquid inlet channel (132), a plurality of liquid inlet holes (133) are arranged on the outer tube (13), one end of a plurality of the liquid inlet holes (133) is communicated with the liquid inlet channel (132), the other end of the liquid inlet hole (133) is communicated with the plasma discharge area (14); Liquid circulation system (2) includes container (21) and circulating pump (22), the container (21) is used for containing wastewater, and is arranged directly below the reactor (1), the circulating pump (22) is suitable for conveying liquid in the container (21) to the liquid inlet channel (132) through pipeline, the plasma discharge area (14) is aligned with the container (21), and the wastewater degraded through the plasma discharge area (14) is returned to the container (21); Power supply (3), the power supply (3) is electrically connected with the reactor (1), and is suitable for forming high voltage electric field in the plasma discharge area (14) through the red copper stick (11);The ceramic medium (12) is made of gypsum board, fused quartz and titanium dioxide particles;The ceramic medium (12) blocks the ultraviolet light generated by discharge and enters the ceramic medium (12) and catalyzes the titanium dioxide particles in the ceramic medium (12), the titanium dioxide nanoparticles are wrapped in a large number of porous channels in the ceramic medium (12), the gap between the titanium dioxide nanoparticles is filled with fused quartz, and part of the fused quartz covers the interface of the ceramic medium (12), and the ultraviolet light can enter the interior of the ceramic medium (12) through the fused quartz and be absorbed by the titanium dioxide nanoparticles in the interior under the action of light refraction.

2. The device for degradation of wastewater based on dielectric barrier discharge coupled optical waveguide catalysis according to claim 1, characterized in that, The reactor (1) is provided with base (15), the base (15) is installed on the lower end of the reactor (1), the base (15) is provided with a plurality of liquid outlet holes (151), one end of each liquid outlet hole (151) is communicated with the plasma discharge area (14), and the other end of each liquid outlet hole (151) faces the container (21).

3. The device for degradation of wastewater based on dielectric barrier discharge coupled optical waveguide catalysis according to claim 1, characterized in that, It also comprises a gas supply system (4) comprising a gas pump (41), a flow meter (42) arranged on a gas path pipe (43) and the gas path pipe (43) having one end communicated with the gas pump (41) and the other end communicated with the plasma discharge zone (14), so that the gas can drive the reaction solution into the plasma discharge zone (14) under pressure.

4. The device for degradation of wastewater based on dielectric barrier discharge coupled optical waveguide catalysis according to claim 3, characterized in that, The power supply (3) comprises a power supply body (31), a voltage regulator (32) and an oscilloscope (33), the positive pole of the power supply body (31) is connected with the copper rod (11), the negative pole of the power supply body (31) is connected with the outer tube (13), the voltage regulator (32) adjusts the voltage of the power supply body (31) through self-coupling adjustment, and the oscilloscope (33) is suitable for monitoring the running state of the power supply (3).

5. The device for degradation of wastewater based on dielectric barrier discharge coupled optical waveguide catalysis according to claim 4, characterized in that, The outer tube (13) is provided with a mounting plate (134), the upper cover (131) is invertedly buckled to the mounting plate (134), and the liquid inlet hole (133) is arranged above the mounting plate (134).

6. The dielectric barrier discharge coupled optical waveguide catalytic wastewater degradation device according to any one of claims 3-5, wherein, The outer tube (13) is a stainless steel tube.

7. The dielectric barrier discharge coupled optical waveguide catalytic wastewater degradation device according to claim 6, wherein, The upper cover (131) is provided with a connecting pipe one (135) and a connecting pipe two (136), the height of the connecting pipe one (135) is higher than that of the connecting pipe two (136), one end of the connecting pipe one (135) is communicated with the liquid inlet channel (132), the other end of the connecting pipe one (135) is communicated with the gas path pipe (43), one end of the connecting pipe two (136) is connected with the circulating pump (22), the other end of the connecting pipe two (136) is communicated with the liquid inlet channel (132), the outer tube (13) is provided with a vent hole (137), the vent hole (137) is respectively communicated with the liquid inlet channel (132) and the plasma discharge zone (14), and the vent hole (137) is aligned with the connecting pipe one (135).

8. The dielectric barrier discharge coupled optical waveguide catalytic wastewater degradation device according to claim 2, wherein, The width of the plasma discharge zone (14) is greater than the diameter of the liquid outlet hole (151).

9. The dielectric barrier discharge coupled optical waveguide catalytic wastewater degradation device according to claim 7, wherein, The aperture of the liquid inlet hole (133) is 1mm-3mm.

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