Plasma electrolytic degradation of wastewater treatment device and method thereof

Abstract

The present application relates to a kind of plasma electrolytic degradation sewage treatment device and method thereof, belong to environmental protection water treatment technical field.The present application selects the fixed bed of baffle type to treat wastewater, and is equipped with a replaceable reactor module, i.e., a U-shaped groove with both ends open, two sides of the groove are fixed with a flat electrode by screw, two electrodes are connected to the positive and negative poles of pulse power respectively, and the electrode sheet is divided into two layers: the lower layer is a metal sheet, and the upper layer is an engineering plastic sheet, a plurality of micropores are provided by laser drilling, with a pore size of 0.5 mm, and the U-shaped groove is filled with particle electrode particles Fe2O3, ZnO, MnO2, Fe3O4, CUO and NiO.According to the needs, the required U-shaped groove can be disassembled for maintenance, and the effect of production and maintenance can be realized.The energy consumption is low, suitable for treating high salinity wastewater, with small electrode loss, which can solve the problem of easy hardening of the reaction bed, and the pollutant degradation rate is high.

Description

TECHNICAL FIELD

[0001] The application relates to a wastewater treatment device and method for electrochemical degradation, in particular to a wastewater treatment device and method for plasma electrolytic degradation, and belongs to the technical field of environmental protection and water treatment. BACKGROUND

[0002] As a new wastewater treatment technology, electrochemical catalytic degradation of wastewater has the advantages of small investment, normal temperature and pressure operation, simple maintenance and good treatment effect. However, the existing wastewater treatment device for plasma electrolytic degradation has the problems of high energy consumption, unsuitability for treating high-salinity wastewater, large electrode loss and easy hardening of the reaction bed. SUMMARY

[0003] The application solves the technical problem of providing a wastewater treatment device and method for plasma electrolytic degradation. The wastewater treatment device for plasma electrolytic degradation of the application can be disassembled and repaired as needed through the design of multiple reactor module U-shaped tanks, other reactor module U-shaped tanks can continue to work, and the effect of production and maintenance can be realized. Moreover, the application has low energy consumption, is suitable for treating high-salinity wastewater, has small electrode loss, can solve the problem of easy hardening of the reaction bed, and has high pollutant degradation rate.

[0004] In order to solve the technical problem of the application, the technical solution is provided as follows: a wastewater treatment device for plasma electrolytic degradation, comprising a baffle fixed bed 1 which is a large rectangular container, a water inlet 4 and a water outlet 5 are arranged on the same side wall surface of the baffle fixed bed 1; a plurality of baffle baffles 3 are arranged in the baffle fixed bed 1, one end of the baffle baffle 3 is fixed on the side wall of the baffle fixed bed 1, the other end of the baffle baffle 3 leaves a gap compared with the side wall opposite to the baffle fixed bed 1 to allow water flow, and the baffle baffles 3 are arranged staggeredly to make the water flow in the baffle fixed bed 1 bend multiple times;

[0005] The baffle fixed bed 1 is internally provided with a plurality of reactor modules,

[0006] One reactor module is assembled by a U-shaped groove 2, two electrode sheets 14, two water-permeable meshes on the end face and a plurality of particle electrode particles; the width of the reactor module is the same as the width of the water flow channel of the baffle fixed bed 1, the reactor module clamps the water flow channel of the baffle fixed bed 1, and the water flow can only flow into the reactor module through the water-permeable mesh of the reactor module; the reactor module is movably connected with the baffle fixed bed 1 through the clamping groove at the bottom, and the embedded reactor module in the water flow channel is replaceable; the two side walls of the U-shaped groove 2 are each fixed with a flat electrode sheet 14 through a screw, and the two electrode sheets in the groove are respectively connected with the positive and negative poles of the pulse power supply; the structure of the electrode sheet 14 is divided into two layers, the upper layer is an insulating layer with a circular hole at each corner, the insulating layer is laser-drilled, and the pore diameter of the micro-hole 12 is 0.5-2mm; the lower layer is a conductive layer with a circular hole at each corner; the insulating layer and the conductive layer of the electrode sheet 14 are fixedly connected on the inner side wall surface of the U-shaped groove 2 through the threaded holes 13 at the four corners by bolts; and the two electrode sheets 14 are symmetrically installed on the inner side wall surface of the U-shaped groove 2.

[0007] The specific structure of the U-shaped groove 2 is a U-shaped structure module composed of two side walls and a bottom surface, and the wall along the two ends of the U-shaped groove 2 and the two side walls are each provided with a threaded hole 13.

[0008] The water-permeable mesh 6 has a rectangular structure, and its size is equal to the area of the end face of the U-shaped groove 2; screw holes 8 are formed at the four corners of the water-permeable mesh 6, so that the water-permeable mesh 6 can be fixedly connected to the threaded holes 13 of the end wall of the U-shaped groove 2 by bolts; a plurality of circular holes 7 or strip-shaped holes 9 are formed on the water-permeable mesh 6, and the pore size is less than 3mm;

[0009] The U-shaped groove is filled with N-type metal oxide particles Fe2O3, ZnO, the U-shaped groove is filled with P-type metal oxide particles CuO, NiO, or the U-shaped groove is filled with mixed particles of P-type and N-type metal oxides Fe2O3, ZnO, MnO 2， CuO, NiO in any combination;

[0010] Preferably, the insulating layer of the electrode sheet 14 is an engineering plastic sheet, a ceramic sheet, a phenolic resin plate, a polyvinyl chloride plate or an acrylic plate.

[0011] Preferably, the conductive layer of the electrode sheet 14 is an iron sheet, a copper sheet, an aluminum sheet or a stainless steel sheet.

[0012] Preferably, the pulse power supply is a bidirectional narrow high-voltage pulse with a pulse peak-peak value (0-100kv), a pulse width (500-1000ns) and a pulse rise time (40-100ns), and the frequency is adjustable at 1-200Hz.

[0013] In order to solve the technical problems of the present application, another technical solution is provided: any of the above-mentioned wastewater treatment devices and methods, specifically comprising the following steps:

[0014] Step one: install multiple reactor modules in the baffling fixed bed 1; wastewater flows into the baffling fixed bed 1 from the water inlet 4, and the water outlet 5 of the baffling fixed bed 1 is closed first;

[0015] Step two: wastewater enters the reactor from the water inlet 4 and passes through the embedded U-shaped groove 2, which is filled with electrode particles, and the electrode sheet 14 of the U-shaped groove 2 is connected to the pulse power source in a timely manner, which generates a two-way narrow high-voltage pulse with a peak value (0-100kv), a pulse width (500-1000ns), and a pulse rise time (40-100ns), and the frequency is adjustable at 1-200Hz;

[0016] At this time, the pulse current between the electrodes is concentrated in the micro-hole channels of the insulating layer of the electrode plate, which are punched by laser. Due to the high concentration of electric field energy, the distorted electric field causes the electrolyte in the high-concentration salt water to be concentrated along the electric lines, forming a salt bridge and eventually short-circuiting, resulting in plasma discharge corresponding to the holes, generating strongly oxidizing plasma discharge gas, and activating the catalyst particles in the groove with a particle size of 3-4mm, which degrades the wastewater through the triple action of high-energy electric field, plasma gas, and catalyst;

[0017] Step three: after the wastewater in the baffling fixed bed 1 overflows the reactor module, and the contaminated water stays in the reactor for half an hour, open the water outlet 5 of the baffling fixed bed 1.

[0018] Preferably, the laser punching of the insulating layer of the electrode sheet 14 has the same punching position on the corresponding arranged two electrode sheets 14, and the holes correspond to each other in space. After the pulse electric field is applied, the electric lines can only pass through the path corresponding to the holes, and the electrolyte is concentrated along the electric lines, forming an ion channel (salt bridge) corresponding to the holes. The ion current causes water electrolysis to produce water vapor, which in turn breaks down and forms plasma discharge, generating strongly oxidizing plasma discharge gas, H ﹢ 、O ﹣ At the same time, the catalyst particles in the groove are activated, which degrades the wastewater through the triple action of high-energy electric field, plasma gas, and catalyst.

[0019] Preferably, the U-shaped groove is filled with P-type and N-type metal oxide mixed particles Fe2O3, ZnO, MnO 2,CuO, NiO, the pulse power emits interval microsecond level bidirectional positive and negative polarity pulse, catalyzes Fe2O3,ZnO, MnO2 to be electronegative, CuO,NiO is electronegative, forms microelectrode oxidation reduction reaction degradation organic matter, and simultaneously at the cathode of electrode piece, carries out aeration through aeration device, bidirectional pulse can generate hydrogen peroxide, chemical equation

[0020] (1) 2H2O-2H2+O2 (electrolytic reaction)

[0021] (2) O2+2H2O-2H2O2 (negative polarity reaction)

[0022] Plasma electric field catalytic metal oxide particle cooperates with plasma discharge oxidation reduction to degrade sewage;Through high-energy electric field, plasma gas, catalyst, H2O2 fourfold effect degradation of sewage. The polluted water is electroplating wastewater, chemical wastewater, or printing and dyeing wastewater.

[0023] Preferably, U-shaped groove is filled with N-type metal oxide particles Fe2O3,ZnO, and simultaneously pulse power emits unidirectional negative polarity pulse, all particles are electronegative, and oxidizing organic matter such as chlorobenzene, nitrobenzene and heavy metal ions is reduced and degraded.

[0024] Preferably, U-shaped groove is filled with P-type metal oxide particles CuO,NiO, and simultaneously pulse power emits unidirectional positive polarity pulse, all particles are electronegative, and reducing organic matter such as congo red and methyl blue is oxidized and degraded.

[0025] The application selects a fixed bed treatment wastewater of baffle type, and is equipped with a replaceable reactor module, that is, a U-shaped groove with two openings, two side walls of the groove are fixed with a flat electrode through screws, two electrodes are connected with positive and negative poles of pulse power respectively, and the electrode piece is divided into two layers: the lower layer is a metal sheet, and the upper layer is an engineering plastic sheet, a plurality of micropores with a diameter of 0.5 mm are punched on the four corners of the engineering plastic sheet, and a plurality of circular holes or strip-shaped holes with a pore size of less than 3 mm are additionally punched on the four corners, the upper engineering plastic sheet (insulating layer) and the lower metal sheet (conductive layer) are fixed by inserting the nylon bolts into the circular holes in the four corners, screw holes are punched on the end faces of the U-shaped groove, and the corresponding positions of the water-permeable mesh are also punched with screw holes, a plurality of circular holes or strip-shaped holes are additionally punched on the mesh, the pore size is less than 3 mm, the U-shaped groove and the water-permeable mesh are connected through the nuts screwed into the screw holes, and finally the U-shaped groove is filled with particle electrode particles Fe2O3, ZnO, MnO2, Fe3O4, CUO, NiO and the like.

[0026] Beneficial effects:

[0027] (1) The traditional method is that the electrolytic cell is integrally arranged, and cannot be maintained while producing, and the plasma electrolytic degradation sewage treatment device can be disassembled and maintained while producing through the design of the multiple reactor module U-shaped grooves.

[0028] (2) When the electrolytic degradation sewage treatment device is reacted for a period of time, the U-shaped groove is disassembled, the catalyst particles are placed in an acid solution for in-situ regeneration, or the catalyst particles are appropriately added according to the need to supplement the catalyst particles reacted, so that the problem of easy hardening of the reaction bed is solved, and the reaction bed can be kept stable for a long time.

[0029] (3) Due to the low average power of the pulse power supply and the synergistic effect of the catalyst, the energy consumption can be greatly reduced, the plasma electrolytic degradation sewage treatment device has low energy consumption and low cost, and the power consumption for treating each ton of polluted water is less than 5 degrees, and the catalyst cost is low.

[0030] In addition, due to the shielding effect of the electrode insulation layer, the metal conductive layer can be protected from electrochemical corrosion, and the electrode loss can be greatly reduced. Since the metal conductive layer is not subjected to electrochemistry, it can be replaced every 10 years instead of every 1 year.

[0031] (4) The existing plasma electrolytic degradation sewage treatment device is not suitable for treating high-salinity wastewater. Since high-salinity wastewater can form ion current under an electric field, only heat can be converted, and discharge plasma discharge cannot be formed. In the application, the hole positions of the two electrode plate insulation layers are the same, the holes correspond in space, the electric lines can only pass through the path corresponding to the holes after the pulse electric field is applied, and the electrolyte is concentrated and distributed along the electric lines. The effect of aggregation directly forms an ion channel (salt bridge) corresponding to the holes. A high-strength ion current causes water electrolysis to produce water vapor, and then breaks down to form plasma discharge, which can be used for high-salinity wastewater.

[0032] (5) The degradation rate of pollutants is increased to more than 50%.

[0033] (6) The effect of laser drilling of the electrode plate insulation layer is that the hole positions of the two electrode plate insulation layers are the same, the holes correspond in space, the electric lines can only pass through the path corresponding to the holes after the pulse electric field is applied, and the electrolyte is concentrated and distributed along the electric lines. The effect of aggregation directly forms an ion channel (salt bridge) corresponding to the holes. A high-strength ion current causes water electrolysis to produce water vapor, and then breaks down to form plasma discharge. Strongly oxidizing plasma discharge gas (H﹢, O﹣) is generated, and the catalyst particles (particle size 3-4 mm) in the tank are activated at the same time. Through the triple action of high-energy electric field, plasma gas and catalyst, the sewage is degraded.

[0034] (7) U-shaped groove filled with P-type and N-type metal oxide mixed particles Fe2O3, ZnO, MnO 2, CuO, NiO, the pulse power emits interval microsecond level bidirectional positive and negative polarity pulse, catalytic Fe2O3, ZnO, MnO2 with negative electricity, CuO, NiO with positive electricity, form microelectrode oxidation-reduction reaction degradation of organic matter, at the same time in the cathode of electrode sheet, through aeration device aeration, bidirectional pulse can generate hydrogen peroxide, chemical equation

[0035] (1) 2H2O-2H2+O2 (electrolysis reaction)

[0036] (2) O2+2H2O-2H2O2 (negative polarity reaction)

[0037] Plasma electric field catalytic metal oxide particles synergistic plasma discharge oxidation-reduction degradation of wastewater; through high-energy electric field, plasma gas, catalyst, H2O2 fourfold effect degradation of wastewater. BRIEF DESCRIPTION OF DRAWINGS

[0038] The application will be further described below with reference to the drawings.

[0039] Figure 1 is the top view of the plasma electrolysis wastewater treatment device;

[0040] Figure 2 is the schematic diagram of U-shaped groove structure;

[0041] Figure 3 is the schematic diagram of water permeable mesh structure;

[0042] Figure 4 is the schematic diagram of water permeable mesh structure;

[0043] Figure 5 is the schematic diagram of electrode sheet structure;

[0044] Figure 6 is the schematic diagram of lower conductive layer structure of electrode sheet;

[0045] Figure 7 is the schematic diagram of upper insulating layer structure of electrode sheet;

[0046] Figure 8 is the schematic diagram of reactor module structure.

[0047] 1-baffled fixed bed, 2-U-shaped groove, 3-baffled baffle, 4-water inlet, 5-water outlet, 6-water permeable mesh, 7-round hole, 8-screw hole, 9-strip hole, 10-conductive layer, 11-insulating layer, 12-micro hole, 13-screw hole, 14-electrode sheet. DETAILED DESCRIPTION

[0048] Embodiment 1

[0049] As Figure 1 shown is a top view of the wastewater treatment device by plasma electrolysis, wherein the baffling fixed bed 1 is a large rectangular container, and a water inlet 4 and a water outlet 5 are formed on the same side wall surface; a plurality of baffling baffles 3 are arranged inside the baffling fixed bed 1, one end of the baffling baffles 3 is fixed on the side wall of the baffling fixed bed 1, and the other end of the baffling baffles 3 leaves a gap compared with the side wall opposite to the baffling fixed bed 1 to allow water flow, and the baffling baffles 3 are arranged staggered, so that the water flow in the baffling fixed bed 1 is bent multiple times.

[0050] A plurality of reactor modules are further arranged inside the baffling fixed bed 1, and one reactor module is composed of one U-shaped groove 2, two electrode sheets 14, two water-permeable mesh sheets 6 and a plurality of particle electrode particles. The water flow channel is embedded with replaceable U-shaped groove modules. The width of the reactor module is the same as the width of the water flow channel of the baffling fixed bed 1, the reactor module clamps the water flow channel of the baffling fixed bed 1, and the water flow can only flow into the reactor module through the water-permeable mesh sheet of the reactor module. The reactor module is movably connected to the baffling fixed bed 1 through the clamping groove arranged at the bottom, and the reactor module embedded in the water flow channel is replaceable.

[0051] The specific structure of the U-shaped groove 2 is shown in Figure 2 , which is a U-shaped structure module composed of two side walls and a bottom surface, and the wall along the two ends of the U-shaped groove 2 and the two side walls are provided with threaded holes 13.

[0052] The water-permeable mesh sheet 6 is shown in Figure 3 and Figure 4 , which is a rectangular structure, and its size is equal to the area of the cross section of the two ends of the U-shaped groove 2. Screw holes 8 are formed on the four corners of the water-permeable mesh sheet 6, so that the water-permeable mesh sheet 6 can be fixedly connected to the threaded holes 13 on the wall along the two ends of the U-shaped groove 2 by bolts. A plurality of round holes 7 or strip-shaped holes 9 are formed on the water-permeable mesh sheet 6, and the pore size is less than 3 mm. Particle electrode particles such as Fe2O3, ZnO, MnO2, CuO and NiO are filled into the U-shaped groove 2.

[0053] The U-shaped groove is filled with N-type metal oxide particles (Fe2O3, ZnO), the U-shaped groove is filled with P-type metal oxide particles (CuO, NiO), or the U-shaped groove is filled with any combination of P-type and N-type metal oxide mixed particles (Fe2O3, ZnO, MnO 2， CuO, NiO).

[0054] The structure of the electrode sheet 14 is shown in Figure 5As shown, divided into two layers, the upper layer is an insulating layer, which can be, such as: engineering plastic sheet, ceramic sheet, phenolic resin plate, vinyl chloride plate, acrylic plate, etc.; laser drilling on the insulating layer, aperture 0.5-2mm; such as Figure 6 As shown. The lower layer is a conductive layer, which can be a metal sheet such as: iron sheet, copper sheet, aluminum sheet, stainless steel sheet, etc., such as Figure 7 As shown. The insulating layer and the conductive layer of the electrode sheet 14 are fixedly connected to the inner side wall surface of the U-shaped groove 2 through the threaded holes 13 at the four corners by bolts, and the two electrode sheets 14 are symmetrically installed on the inner side wall surface of the U-shaped groove 2. The electrode sheet in the groove is connected to the pulse power supply. The electrode sheet 14 of the U-shaped groove 2 is connected to the pulse power supply, and a bidirectional narrow high-voltage pulse with a peak value (0-100kv), a pulse width (500-1000ns), and a pulse rise time (40-100ns) is generated, and the frequency is adjustable at 1-200Hz.

[0055] The schematic diagram of the reactor module after assembly is shown in Figure 8

[0056] Example 2

[0057] The plasma electrolytic degradation wastewater treatment device is as described in Example 1, and the specific difference is:

[0058] A plurality of round holes 7 are formed on the water permeable mesh 6, and five reactor modules are arranged inside the baffling fixed bed 1. The upper layer is an insulating layer which is a polyvinyl chloride plate. Laser drilling is performed on the insulating layer, and the aperture is 0.5mm. The lower layer is a conductive layer which is a metal sheet of iron.

[0059] In this embodiment, the U-shaped groove is filled with mixed particles of P-type and N-type metal oxides (Fe2O3, MnO 2, ZnO, CuO, NiO), and the pulse power supply generates a bidirectional positive and negative pulse with an interval (microsecond level). The Fe2O3, ZnO, MnO2 are negatively charged, and the CuO, NiO are positively charged, forming a micro-electrode oxidation-reduction reaction to degrade organic matter. At the same time, the cathode of the electrode sheet is aerated by an aeration device, and the bidirectional pulse can generate hydrogen peroxide, and the chemical equation is

[0060] (1) 2H2O → 2H2 + O2 (electrolysis reaction)

[0061] (2) O2 + 2H2O → 2H2O2 (negative polarity reaction)

[0062] The plasma electric field catalytic metal oxide particles cooperate with the plasma discharge oxidation-reduction to degrade wastewater. The polluted water is electroplating wastewater, chemical wastewater, or printing and dyeing wastewater.

[0063] The method for plasma electrolytic degradation of wastewater treatment specifically includes the following steps:

[0064] ​Step one: install multiple reactor modules in the baffle fixed bed 1; wastewater flows into the baffle fixed bed 1 from the inlet, and the outlet of the baffle fixed bed 1 is closed first;

[0065] Step two: put particle electrode particles into the U-shaped groove 2, and at the same time, the electrode sheet 14 of the U-shaped groove 2 is connected to the pulse power supply, and the two-way narrow high-voltage pulse with a pulse peak of (0-100kv), a pulse width of (500-1000ns), and a pulse rise time of (40-100ns) and a frequency of 1-200Hz can be adjusted.

[0066] At this time, the pulse current between the electrodes is concentrated in the micro-hole channels of the electrode plate insulation layer punched by laser, and due to the high concentration of electric field energy, the distorted electric field makes the electrolyte in the high-concentration salt water concentrate along the electric lines, forms a salt bridge and eventually short-circuits, resulting in plasma discharge corresponding to the holes, generating strong oxidizing plasma discharge gas. At the same time, the catalyst particles (particle size 3-4mm) in the groove are activated. Through the triple action of high-energy electric field, plasma gas, and catalyst, the wastewater is degraded.

[0067] Wastewater enters the reactor inlet and passes through the embedded U-shaped groove, and the electrodes in the groove are connected to the pulse power supply in real time. The two-way narrow high-voltage pulse has a pulse peak of (0-100kv), a pulse width of (500-1000ns), and a pulse rise time of (40-100ns), and a frequency of 1-200Hz can be adjusted. The effect of laser punching of the electrode plate insulation layer is that: due to the same punching position of the corresponding arranged two electrode plate insulation layers, the holes correspond in space. After the pulse electric field is applied, the electric lines can only pass through the path corresponding to the holes, plus the aggregation effect of the electrolyte concentrated along the electric lines, directly forming the ion channel (salt bridge) corresponding to the holes, and the ion current causes water electrolysis to produce water vapor, and then breaks down and forms plasma discharge. Strong oxidizing plasma discharge gas, (H﹢, O﹣ ) is generated, and the catalyst particles (particle size 3-4mm) in the groove are activated at the same time. At the same time, the cathode of the electrode sheet is aerated through the aeration device, and the two-way pulse can generate hydrogen peroxide, and the chemical equation is:

[0068] (1) 2H2O→2H2+O2 (electrolysis reaction)

[0069] (2) O2+2H2O→2H2O2 (negative polarity reaction)

[0070] Through the fourfold action of high-energy electric field, plasma gas, catalyst, and H2O2, the wastewater is degraded.

[0071] Step three: after the wastewater in the baffle fixed bed 1 covers the reactor module, and the contaminated water stays in the reactor for half an hour or less, open the water outlet 5 of the baffle fixed bed 1.

[0072] Because the average power of the pulse power supply is low, and the synergistic effect of the catalysts can greatly reduce the energy consumption, and because of the shielding effect of the electrode insulation layer, the metal conductive layer can be protected from electrochemical corrosion, greatly reducing the electrode loss. The U-shaped groove module can be replaced regularly to solve the problem of hardening and maintain the long-term stable operation of the reaction bed.

[0073] The experimental results of treating glyphosate pesticide wastewater by the plasma electrolysis wastewater treatment device of Example 2 are shown in Table 1:

[0074] Table 1

[0075]

[0076] Serial number 1 is the sample before treatment, PH = 7, COD (mg / L) = 127300, F1-F3 are the data after sample treatment, and the sampling results are taken every half hour.

[0077] Example 3

[0078] This example is basically the same as Example 2, except that the U-shaped groove is filled with N-type metal oxide particles (Fe2O3, ZnO), and the pulse power supply emits unidirectional negative polarity pulses, all particles are negatively charged, and the oxidation of organic matter such as chlorobenzene, nitrobenzene and heavy metal ions: Cu, Ge, Mn, Ni or Hg is reduced and degraded.

[0079] At the same time, the cathode of the electrode sheet is aerated by an aeration device, and unidirectional pulses can generate hydrogen peroxide, the chemical equation is:

[0080] (1) 2H2O——2H2 + O2 (electrolysis reaction)

[0081] (2) O2+2H2O——2H2O2 (negative polarity reaction)

[0082] Plasma electric field catalytic metal oxide particles synergize with plasma discharge oxidation and reduction to degrade wastewater.

[0083] Example 4

[0084] This example is basically the same as Example 2, except that the U-shaped groove is filled with P-type metal oxide particles (CuO, NiO), and the pulse power supply emits unidirectional positive polarity pulses, all particles are positively charged, and the oxidation of reducing organic matter such as Congo red and methyl blue is degraded. The pollutants in the polluted water are ionic organic matter: Congo red, methylene blue, toluene, organophosphorus pesticides, phenol, benzene or chlorobenzene.

[0085] At the same time, the cathode of the electrode sheet is aerated by an aeration device, and unidirectional pulses can generate hydrogen peroxide, the chemical equation is:

[0086] (1) 2H2O - 2H2 + O2 (electrolysis reaction)

[0087] (2) O2 + 2H2O - 2H2O2 (negative polarity reaction)

[0088] Plasma electric field catalytic metal oxide particles cooperate with plasma discharge oxidation-reduction to degrade sewage.

[0089] The present application is not limited to the specific technical solutions described in the above embodiments, and any technical solution formed by equivalent replacement is within the scope of protection required by the present application.

Claims

1. A plasma electrolysis degradation wastewater treatment device, characterized in that... The system includes a baffle-type fixed bed, which is a large rectangular container with a water inlet and outlet on the same side wall. The baffle-type fixed bed is equipped with several baffles inside. One end of the baffle is fixed to the side wall of the baffle-type fixed bed, and the other end of the baffle has a gap relative to the opposite side wall of the baffle-type fixed bed to allow water to pass through. The baffles are staggered, which causes the water flow in the baffle-type fixed bed to bend multiple times. The baffled fixed bed also contains multiple reactor modules. Each reactor module consists of a U-shaped trough, two electrode plates, two permeable mesh panels on the end face, and several particle electrode particles. The width of the reactor module is the same as the width of the water flow channel of the baffled fixed bed. The reactor module blocks the water flow channel of the baffled fixed bed, and the water can only flow into the reactor module through the permeable mesh panels. The reactor module is movably connected to the baffled fixed bed through a slot at the bottom. The reactor module embedded in the water flow channel is replaceable. Each side wall of the U-shaped trough is fixed with a flat electrode plate by screws. The two electrode plates in the trough are respectively connected to the positive and negative terminals of the pulse power supply. The electrode plate has a structure of two layers. The upper layer is an insulating layer with round holes at the four corners. The insulating layer is laser-drilled with micro-holes with a diameter of 0.5-2mm. The lower layer is a conductive layer with round holes at the four corners. The insulating layer and the conductive layer of the electrode plate are fixed to the inner wall of the U-shaped trough by bolts through the threaded holes at the four corners. The two electrode plates are symmetrically installed on the inner wall of the U-shaped trough. The specific structure of the U-shaped channel is a U-shaped structural module consisting of two side walls and a bottom surface. Threaded holes are provided on the wall edges at both ends of the U-shaped channel and on the two side walls. The permeable mesh is a rectangular structure, the size of which is equal to the area of ​​the two end faces of the U-shaped channel. The permeable mesh has screw holes at the four corners, so that the permeable mesh can be fixed to the threaded holes on the two end walls of the U-shaped channel by bolts; the permeable mesh has several round holes with a gap of less than 3mm. The U-shaped groove is filled with a mixture of P-type and N-type metal oxide particles, including Fe₂O₃, ZnO, and MnO. 2， CuO, NiO.

2. The plasma electrolysis degradation wastewater treatment device according to claim 1, characterized in that... The electrode insulating layer is made of engineering plastic sheet, ceramic sheet, phenolic resin board, polyvinyl chloride board or acrylic board.

3. The plasma electrolysis degradation wastewater treatment device according to claim 1, characterized in that... The conductive layer of the electrode sheet is made of iron, copper, aluminum or stainless steel.

4. The plasma electrolysis degradation wastewater treatment device according to claim 1, characterized in that... The pulse power supply is a bidirectional narrow high-voltage pulse with a peak-to-peak value of 0-100kV, a pulse width of 500-1000ns, a pulse rise time of 40-100ns, and an adjustable frequency of 1-200Hz.

5. The method for treating wastewater using the plasma electrolysis degradation wastewater treatment device according to any one of claims 1-4, characterized in that... Specifically, the steps include the following: Step 1: Install multiple reactor modules inside the baffled fixed bed; wastewater flows in through the water inlet of the baffled fixed bed, and first close the water outlet of the baffled fixed bed; Step 2: Wastewater enters the reactor through the water inlet and passes through the embedded U-shaped groove. The U-shaped groove is filled with electrode particles. At the same time, the electrode plates in the U-shaped groove are connected to the pulse power supply. The pulse power supply is a bidirectional narrow high-voltage pulse with a peak-to-peak value of 0-100kV, a pulse width of 500-1000ns, a pulse rise time of 40-100ns, and an adjustable frequency of 1-200Hz. At this time, the pulse current between the electrodes is concentrated in the micro-channels of the electrode plate insulation layer through laser. Due to the high concentration of electric field energy, the distorted electric field causes the electrolytes in the high-concentration brine to be concentrated along the electric field lines, forming salt bridges and eventually short-circuiting, resulting in plasma discharge corresponding to the holes, generating a highly oxidizing plasma discharge gas, and at the same time activating the catalyst particles in the tank. The catalyst particles have a particle size of 3-4 mm. Through the triple action of high-energy electric field, plasma gas and catalyst, the wastewater is degraded. Step 3: After the wastewater in the baffled fixed bed has submerged the reactor module and has remained in the reactor for half an hour, open the water outlet of the baffled fixed bed.

6. The method for treating wastewater using the plasma electrolysis degradation wastewater treatment device according to claim 5, characterized in that... The U-shaped trough is filled with a mixture of P-type and N-type metal oxide particles, namely Fe2O3, ZnO, and MnO. 2, CuO and NiO are generated by a pulsed power supply emitting bidirectional positive and negative polarity pulses at microsecond intervals. This catalyzes the formation of negatively charged Fe2O3, ZnO, and MnO2, and positively charged CuO and NiO, resulting in a microelectrode redox reaction that degrades organic matter. Simultaneously, aeration occurs at the cathode of the electrode plate via an aeration device. The bidirectional pulses also generate hydrogen peroxide. The chemical equation is as follows: (1) Electrolysis reaction: 2H2O——2H2 + O2 (2) Negative polarity reaction: O2 + 2H2O → 2H2O2 Plasma electric field catalyzes the oxidation-reduction degradation of wastewater by metal oxide particles in synergistic plasma discharge; the wastewater is degraded through the quadruple action of high-energy electric field, plasma gas, catalyst, and H2O2, and the wastewater is electroplating wastewater or dyeing wastewater.

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