CN113277600A - Red mud particle electrode and preparation method and application thereof - Google Patents
Red mud particle electrode and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F11/00—Treatment of sludge; Devices therefor
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
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- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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Abstract
The application discloses a red mud particle electrode, a preparation method and application. The red mud particle electrode comprises carbon and red mud subjected to acid cleaning treatment; the mass ratio of the red mud to the carbon is 1-5: 1-5. The red mud particle electrode can be used as a three-dimensional particle electrode and a catalyst, the two mechanisms are well coupled, the removal effect of the red mud particle electrode on organic matters in water is enhanced, and the red mud particle electrode is applied to a catalytic wet electro-oxidation technology, so that the purpose of changing the red mud into valuables and treating wastes with wastes is achieved.
Description
Technical Field
The application relates to a red mud particle electrode and a preparation method and application thereof, belonging to the technical field of electrochemistry.
Background
At present, the production process of alumina mainly comprises a Bayer process, a sintering process and a combination process, wherein a large amount of Red Mud (RM) is generated in the production processes, and 0.5-2.5 t of red mud is generated every 1t of alumina is produced. The red mud contains a large amount of iron oxide (Fe)2O3) The main mineralized substances comprise goethite (alpha-FeOOH) and hematite (alpha-Fe)2O3) Quartz (SiO)2) And diaspore (Al)2O3.3H2O) and metal oxides such as iron, aluminum, titanium, calcium and the like, so the red mud has a plurality of basic preparation raw materials for efficiently treating sewage.
Nowadays, the demand for aluminum is getting bigger and bigger in China, the discharge amount of red mud is also on the trend of increasing year by year, the main red mud treatment mode is damming, on one hand, valuable metal waste can be caused, on the other hand, the alkalinity of the red mud can pollute soil and underground water, so that the resource utilization of the sludge is imperative, and the environmental pollution is reduced. At present, researchers have studied the comprehensive utilization of red mud. For example, the catalyst prepared by modifying red mud with cerium oxide is applied to an ozone catalytic oxidation device in Chinese patent CN 103570120B, and has good catalytic effect on removing bezafibrate; in the patent CN 103706338A, polystyrene microspheres are introduced into red mud to form pores, so that the pore structure of the red mud is increased, and the red mud is modified, so that the effect of removing organic dyes is enhanced; CN 102502944A improves the ability of red mud to ozone and pollutants by modifying the red mud, realizes the coupling of adsorption and degradation, and thereby enhances the removal effect of organic matters.
However, the removal rate of organic matter and the removal rate of TOC obtained by red mud particles in wastewater treatment are not good.
Disclosure of Invention
According to one aspect of the application, the red mud particle electrode is provided and applied to research on catalytic wet electrooxidation degradation of organic wastewater, and the prepared particle electrode has the advantages of simple preparation method, low price, long service life and the like.
A red mud particle electrode comprises carbon and acid modified red mud;
the mass ratio of the acid modified red mud to the carbon is 1-5: 1-5.
Optionally, the carbon is selected from at least one of graphite powder, acetylene black, activated carbon powder, graphene and carbon nanotubes.
Optionally, the red mud particle electrode also contains a binder and a reinforcing agent;
the mass ratio of the red mud, the adhesive, the reinforcing agent and the carbon is 1-5: 1-3: 1-10: 1-5.
The red mud particle electrode consists of red mud, a binder, a reinforcing agent and carbon; the mass proportion relation of each component is as follows: the mass ratio of the red mud, the adhesive, the reinforcing agent and the carbon is 1-5: 1-3: 1-10: 1-5.
The red mud particle electrode mainly comprises:
acid-modified red mud;
a binder for molding;
a reinforcing agent for reinforcing the strength of the particle electrode;
carbon powder for enhancing conductivity.
Preferably, the mass ratio of the red mud, the adhesive, the reinforcing agent and the carbon is 4-5: 1-2: 4-5.
Optionally, the binder is selected from at least one of sesbania powder, bentonite, activated clay, methyl cellulose, polyaniline, polyvinyl acetate and acrylic resin.
Optionally, the reinforcing agent is selected from at least one of glass powder and quartz sand.
Optionally, the red mud particle electrode has an axial length of 4-8 mm and a radial length of 1-3 mm.
According to another aspect of the application, the red mud particle electrode is obtained by molding and roasting a mixture containing carbon powder and acid-modified red mud.
Optionally, the roasting conditions are: roasting at 500-800 ℃; roasting for 1-6 h; the heating rate is 2-5 ℃/min.
In the application, the roasting condition is utilized, so that the roasted mixture forms a good pore structure, has a large surface area, is a good carrier for preparing the catalyst, and in the roasting process, goethite can be further converted into hematite with catalytic performance, so that the application potential of treating sewage by catalytic oxidation is realized.
In the application, the roasted particle electrode has a rich pore structure, and the pore diameter is 0.5-2 mu m.
Specifically, the upper limit of the calcination temperature is independently selected from 550 ℃, 600 ℃, 650 ℃, 700 ℃, 750 ℃, 800 ℃; the lower limit of the calcination temperature is independently selected from the group consisting of 500 deg.C, 550 deg.C, 600 deg.C, 650 deg.C, 700 deg.C, and 750 deg.C.
The upper limit of the roasting time is independently selected from 2h, 3h, 4h, 5h and 6 h; the lower limit of the calcination time is independently selected from 1h, 2h, 3h, 4h, 5 h.
The upper limit of the heating rate is independently selected from 3 ℃/min, 4 ℃/min and 5 ℃/min; the lower limit of the heating rate is independently selected from 2 ℃/min, 3 ℃/min and 4 ℃/min.
In the application, the red mud is pickled, so that oxygen-containing functional groups on the surface can be increased, and the red mud has a better effect of removing organic pollutants.
Optionally, the acid-modified red mud is obtained by pickling red mud; the acid in the acid washing treatment process comprises any one of acetic acid, nitric acid, sulfuric acid and hydrochloric acid.
The acid washing treatment is carried out under the water bath condition, and the acid washing condition is as follows: the water bath temperature is 65-95 ℃; the rotating speed is 50-200 r/min; the time is 60-240 min; the acid concentration is 0.1-0.5 mol/L.
Specifically, the concentration of the acid is 0.1-0.5 mol/L, and the upper limit of the concentration of the acid is selected from 0.3mol/L and 0.5 mol/L; the lower limit of the concentration of the acid is selected from 0.1mol/L and 0.3 mol/L.
Specifically, the upper limit of the temperature of the water bath is selected from 70 ℃, 85 ℃, 90 ℃ and 95 ℃; the lower limit of the temperature of the water bath is selected from 65 deg.C, 70 deg.C, 85 deg.C, and 90 deg.C.
The upper limit of the rotating speed is independently selected from 150r/min and 200 r/min; the lower limit of the rotation speed is independently selected from 50r/min and 150 r/min.
The upper limit of the pickling time is selected from 120min, 180min and 240 min; the lower limit of the pickling time is selected from 60min, 120min and 180 min. :
optionally, the preparation method comprises:
a) grinding, acid washing, washing and drying the red mud to obtain acid modified red mud,
b) uniformly mixing the acid modified red mud with an adhesive, a reinforcing agent and carbon powder to obtain the mixture,
c) and forming and roasting the mixture to obtain the red mud particle electrode.
One possible preparation method is described below, which comprises:
s100, grinding: drying the red mud in an oven at 100-120 ℃ for 60-240 min, grinding, and sieving with a 100-200 mesh sieve;
s200, acid washing: and (3) pickling the red mud in the step S100 by using 0.1-0.5 mol/L acid through a water bath shaker, wherein the pickling conditions are as follows: the water bath temperature is 65-95 ℃; the rotating speed is 50-200 r/min; the time is 60-240 min;
s300, washing: filtering the red mud after acid washing in the step S200, and repeatedly washing the red mud with deionized water for 7-16 times until the washing water is neutral;
s400, drying: filtering the red mud in the step S300, and drying in an oven at 80-120 ℃ for 6-12 h;
s500, dry mixing: uniformly mixing the red mud obtained in the step S400 with an adhesive, a reinforcing agent and carbon powder to obtain the mixture;
s600, extruding strips: adding water into the mixture obtained in the step S500, stirring the mixture into paste, extruding the paste by a strip extruding machine, and drying the paste in an oven at the temperature of 80-120 ℃;
s700, roasting: and (5) roasting the formed mixture in the step (S600), wherein the roasting temperature is 500-800 ℃, the heating rate is controlled to be 2-5 ℃/min, and the roasting time is 1-6 h, so as to obtain the red mud particle electrode.
Optionally, the particle size of the ground and sieved red mud is 5-20 μm.
According to another aspect of the application, a method for degrading organic wastewater is further provided, and the red mud particle electrode obtained by the preparation method are used for carrying out catalytic wet electrooxidation degradation on the organic wastewater.
Specifically, the organic wastewater comprises isophorone, m-cresol, glyphosate, acetic acid, acrylic acid, methyl orange and phenol.
The application also provides a method for catalyzing wet electrooxidation degradation of organic wastewater by using the red mud particle electrode as a three-dimensional particle electrode.
Optionally, the red mud particle electrode is a three-dimensional particle electrode, and under the condition of an oxygen source, the red mud particle electrode cooperates with the cathode and the anode to perform wet electrooxidation degradation on the organic wastewater.
Specifically, the red mud particles are three-dimensional particle electrodes, serving as third poles, having not only the effect of electrodes but also the effect of catalysts.
Optionally, the red mud particle electrodes are distributed in the cavity of the whole reaction kettle;
the cathode and the anode form an electrode pair, and the electrode pair is positioned at the upper part or the lower part of the cavity of the reaction kettle;
the cathode is selected from at least one of a titanium mesh, a titanium plate, a noble metal electrode, a mixed metal oxide electrode, a graphite electrode and a gas diffusion electrode;
the anode is at least one of a lead dioxide electrode, a noble metal electrode, a mixed metal oxide electrode, a graphite electrode, a tin dioxide electrode and a boron-doped diamond film electrode.
Optionally, an anode is arranged in the cavity of the reaction kettle, and the anode is selected from at least one of a lead dioxide electrode, a noble metal electrode, a mixed metal oxide electrode, a graphite electrode, a tin dioxide electrode and a boron-doped diamond film electrode;
the reaction kettle serves as a cathode;
the red mud particle electrodes are distributed at the upper part or the lower part of the reaction kettle cavity.
Specifically, when the reaction kettle serves as a cathode, the material of the reaction kettle may be any one of titanium and stainless steel.
Optionally, the conditions of the wet electro-oxidative degradation are: the reaction temperature is 240-300 ℃; the reaction pressure is 5.5MPa to 9.0 MPa; the current density is 10 to 30mA/cm2(ii) a The oxygen flow is 20-50 mL/min; the mass airspeed of the organic wastewater is 1-6 h-1。
In the application, the red mud particle electrode is used for catalyzing wet-type electrooxidation of organic sewage, the removal rate of organic matters can reach more than 99%, and the removal rate of TOC can reach more than 85%.
The red mud particle electrode provided by the application is a carbon-modified acid-treated red mud particle electrode, namely, the red mud particle electrode is used as a three-dimensional particle electrode, and has a good application effect in the catalytic wet electrocatalytic oxidation treatment of wastewater.
The method aims to provide a novel, efficient and economical preparation method of the red mud particle electrode, and carbon powder is doped into the acid-modified red mud particle electrode, so that the red mud particle electrode is rich in certain conductivity and active sites; in addition, the red mud particle electrode is rich in porous structure, so that the prepared red mud particle electrode has stronger adsorption and catalysis performances, is used as a catalyst, well couples two mechanisms, enhances the removal effect of the red mud particle electrode on organic matters in water, and is applied to a catalytic wet-type electrooxidation technology, thereby achieving the purposes of changing waste into valuables and treating waste with waste.
The beneficial effects that this application can produce include:
(1) the red mud particle electrode prepared by the invention has the advantages of simple preparation method, low price, long service life and the like.
(2) The red mud particle electrode prepared by the invention and the red mud subjected to acid treatment are further roasted at high temperature (500-800 ℃), and a good pore structure can be formed after roasting, so that the red mud particle electrode has a large surface area and is a good carrier for catalyst preparation.
(3) The red mud particle electrode prepared by the invention can further convert the goethite into the hematite with catalytic performance in the roasting process, and has the application potential of treating sewage by catalytic oxidation.
(4) The red mud particle electrode prepared by the invention can recycle waste, thereby achieving the purposes of changing waste into valuable and treating waste with waste.
Drawings
FIG. 1 is an electron micrograph of red mud particles of example 1;
FIG. 2 is an electron micrograph of the red mud particles of example 2;
FIG. 3 is a combination of red mud particle electrodes and electrodes in example 5;
FIG. 4 shows the red mud particle electrode and the electrode combination in example 6;
FIG. 5 shows the red mud particle electrode and the electrode combination in example 7.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
In the examples, the organic matter degrading performance of the samples was measured by using an Shimadzu total organic carbon analyzer.
In the examples, the conversion of organic substances was measured by HPLC-P1201 type high performance liquid chromatography.
Organic conversion rate ═ C0-Ct)/C0×100％
C0Is the initial organic concentration, CtInitial organic matter concentration at time t
Total organic carbon removal (TOC)0-TOCt)/TOC0×100％
TOC0As initial total organic carbon, TOCtIs the total organic carbon at the time t,
wherein the organic matter is selected from one of isophorone, m-cresol, glyphosate, acetic acid and acrylic acid.
Example 1 preparation of red mud particle electrode
Grinding, namely drying a proper amount of red mud in a 120 ℃ oven for 120min, grinding, and sieving by a 200-mesh sieve;
pickling, namely pickling the red mud in the step one by using 0.3mol/L nitric acid in a water bath shaker, wherein the water bath temperature is 85 ℃, the rotating speed is 150r/min, and the time is 240 min;
washing, filtering the red mud after acid washing in the step two, and repeatedly washing for 13 times by using deionized water until the washing water is neutral;
drying, namely filtering the red mud in the step three, and drying in an oven at 120 ℃ for 6 hours;
(V) dry mixing, namely uniformly mixing the red mud, the sesbania powder, the glass powder and the acetylene black in the step IV according to the mass ratio of 5:1:1: 5;
sixthly, extruding strips, namely adding water into the mixture in the step five, stirring the mixture into paste, extruding the paste by using a strip extruding machine, and drying the paste in a 120 ℃ drying oven;
and (seventhly), roasting the formed mixture in the step six in a muffle furnace at the roasting temperature of 550 ℃, controlling the temperature rise rate at 2 ℃/min, roasting for 4 hours, naturally cooling to room temperature to obtain the red mud particle electrode, and recording the red mud particle electrode as a No. 1 sample.
Example 2 preparation of red mud particle electrode
In contrast to example 1, the acid used was sulfuric acid, the water bath temperature was 70 ℃, the binder was methylcellulose, and the firing temperature was 700 ℃ to give a red mud particle electrode, designated sample # 2.
Example 3 preparation of red mud particle electrode
Different from the example 1, the acid used is acetic acid, the water bath temperature is 95 ℃, the adhesive is bentonite, the carbon powder is graphite powder, the roasting temperature is 800 ℃, the roasting time is 1.5h, and the heating rate is 5 ℃/min, so that the red mud particle electrode is obtained and is marked as a No. 3 sample.
Example 4 morphology testing of red mud particle electrodes
And respectively carrying out scanning electron microscope tests on the samples 1# to 3# by using an FE-SEM SUPRA 55 testing instrument.
The test result shows that: the red mud particle electrodes all have a porous structure.
Taking a sample No. 1 and a sample No. 2 as typical representatives, wherein FIG. 1 is an electron microscope image of a red mud particle electrode of the sample No. 1, FIG. 2 is an electron microscope image of a red mud particle electrode of the sample No. 2, and as can be seen from FIG. 1 and FIG. 2, the particle electrode after roasting has a rich pore structure, and the pore diameter is 0.5-2 μm.
Example 5 treatment of wastewater test
The red mud particle electrode 1# sample prepared in example 1 is loaded into a catalytic wet electrooxidation system to degrade wastewater with isophorone concentration of 10000ppm, the combination mode of the red mud particle electrode and the electrode is shown in fig. 3, dots in the figure are the red mud particle electrode, strip electrodes are respectively a cathode and an anode, the cathode is a titanium mesh (Dajunke environment), the anode is a ruthenium iridium oxide electrode (Dajunke environment), the red mud particle electrode is filled in the whole reaction kettle cavity (the red mud particle electrode is both an electrode and a catalyst), the cathode and anode electrode pair is positioned at the upper part of the reaction kettle cavity, and the mass space velocity of the wastewater is 2h-1；0.2mol L-1Sodium sulfate as electrolyte and current density of 20mA/cm2Temperature ofThe temperature is 256 ℃, the oxygen flow is 30mL/min, the pressure is 7Mpa, the retention time is 2h, the removal rate of the isophorone is 100%, and the removal rate of the effluent TOC is 86%.
Example 6 test for treating wastewater
The red mud particle electrode 2# sample prepared in example 2 was loaded into a catalytic wet electrooxidation system to degrade wastewater with m-cresol concentration of 10000ppm, the red mud particle electrode and the electrode were combined as shown in fig. 4, the dots in the figure are red mud particle electrodes, the strip electrode is an anode (ruthenium iridium oxide electrode (Dajunke dynasty), the reaction kettle is used as a cathode (made of titanium), the red mud particle electrode is filled in the lower part of the cavity of the reaction kettle, the anode is fixed along the axial direction of the cavity of the reaction kettle, the lower end of the anode is inserted into the red mud particle electrode, and the mass space velocity of the wastewater is 6h-1；0.2mol L-1Sodium sulfate as electrolyte and current density of 10mA/cm2The temperature is 265 ℃, the oxygen flow is 30mL/min, the pressure is 5.5Mpa, the retention time is 2h, the m-cresol removal rate is 100 percent, and the effluent TOC removal rate is 88.3 percent.
Example 7 treatment of wastewater test
The red mud particle electrode 2# sample prepared in example 2 is loaded into a catalytic wet electrooxidation system to degrade waste water with glyphosate concentration of 20000ppm, the combination mode of the red mud particle electrode and the electrode is shown in fig. 5, dots in the figure are red mud particle electrodes, a strip electrode is an anode (ruthenium-titanium oxide electrode (Dajunke environment)), a reaction kettle is used as a cathode (made of titanium), the red mud particle electrode is filled at the upper part of a cavity of the reaction kettle, the anode is fixed along the axial direction of the cavity of the reaction kettle, the upper end of the anode is inserted into the red mud particle electrode, and the mass space velocity of the waste water is 3L-1；0.3mol L-1Sodium sulfate as electrolyte and current density of 30mA/cm2The temperature is 250 ℃, the oxygen flow is 30mL/min, the pressure is 7.0Mpa, the retention time is 2.5h, the removal rate of glyphosate is 100 percent, and the removal rate of effluent TOC is 91.24 percent.
Example 8 test for treating wastewater
The sample No. 1 red mud particle electrode prepared in example 1 was loaded into a catalytic wet electrooxidation system to degrade wastewater with acetic acid concentration of 10000ppm, and the red mud particle electrode and electrodeThe combination mode is shown in figure 3, the mass space velocity of the waste water is 3L-1，0.1mol L-1Sodium chloride as electrolyte and current density of 30mA/cm2The temperature is 255 ℃, the oxygen flow is 40mL/min, the pressure is 7.5Mpa, the retention time is 2.0h, the removal rate of acetic acid is 100 percent, and the removal rate of effluent TOC is 93.25 percent.
Example 9 treatment of wastewater test
The red mud particle electrode 2# sample prepared in example 2 is loaded into a catalytic wet electro-oxidation system to degrade wastewater with acrylic acid concentration of 20000ppm, the combination mode of the red mud particle electrode and the electrode is shown in figure 3, and the mass space velocity of the wastewater is 2L-1，0.1mol L-1Sodium chloride as electrolyte and current density of 30mA/cm2The temperature is 265 ℃, the oxygen flow is 40mL/min, the pressure is 8.5Mpa, the retention time is 2.5h, the removal rate of acrylic acid is 100 percent, and the removal rate of TOC of effluent is 96.20 percent.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. A red mud particle electrode is characterized in that the red mud particle electrode comprises carbon and acid modified red mud;
the mass ratio of the acid modified red mud to carbon is 1-5: 1 to 5.
2. The red mud particle electrode according to claim 1, wherein the carbon is at least one selected from graphite powder, acetylene black, activated carbon powder, graphene, and carbon nanotubes.
3. The red mud particle electrode according to claim 1, wherein the red mud particle electrode further comprises a binder and a reinforcing agent;
the mass ratio of the red mud, the adhesive, the reinforcing agent and the carbon is 1-5: 1-3: 1-10: 1-5.
4. The red mud particle electrode according to claim 3, wherein the binder is at least one selected from sesbania powder, bentonite, activated clay, methyl cellulose, polyaniline, polyvinyl acetate, and acrylic resin;
the reinforcing agent is at least one of glass powder and quartz sand.
5. The preparation method of the red mud particle electrode is characterized in that a mixture containing carbon powder and acid modified red mud is formed and roasted to obtain the red mud particle electrode.
6. The method according to claim 5, wherein the firing conditions are as follows: roasting at 500-800 ℃; roasting for 1-6 h; the heating rate is 2-5 ℃/min.
7. The preparation method according to claim 5, wherein the acid-modified red mud is obtained by acid-washing red mud;
the acid in the acid washing treatment process comprises any one of acetic acid, nitric acid, sulfuric acid and hydrochloric acid.
8. The method of claim 7, wherein the acid washing treatment is performed under water bath conditions;
the acid washing conditions are as follows: the water bath temperature is 65-95 ℃; the rotating speed is 50-200 r/min; the time is 60-240 min; the acid concentration is 0.1-0.5 mol/L.
9. The method of manufacturing according to claim 5, comprising:
a) grinding, acid washing, washing and drying the red mud to obtain acid modified red mud,
b) uniformly mixing the acid modified red mud with an adhesive, a reinforcing agent and carbon powder to obtain the mixture,
c) and forming and roasting the mixture to obtain the red mud particle electrode.
10. A method for degrading organic wastewater is characterized in that the red mud particle electrode of any one of claims 1 to 4 and the red mud particle electrode obtained by the preparation method of any one of claims 5 to 9 are used for carrying out catalytic wet electrooxidation degradation on the organic wastewater;
preferably, the red mud particle electrode is a three-dimensional particle electrode, and under the condition of an oxygen source, the red mud particle electrode is cooperated with a cathode and an anode to carry out catalytic wet-type electrooxidation degradation on the organic wastewater;
preferably, the red mud particle electrodes are distributed in the whole reaction kettle cavity;
the cathode and the anode form an electrode pair, and the electrode pair is positioned at the upper part or the lower part of the cavity of the reaction kettle;
the cathode is selected from at least one of a titanium mesh, a titanium plate, a noble metal electrode, a mixed metal oxide electrode, a graphite electrode and a gas diffusion electrode;
the anode is selected from at least one of a lead dioxide electrode, a noble metal electrode, a mixed metal oxide electrode, a graphite electrode, a tin dioxide electrode and a boron-doped diamond film electrode;
preferably, the cavity of the reaction kettle is provided with an anode along the axial direction, and the anode is selected from at least one of a lead dioxide electrode, a noble metal electrode, a mixed metal oxide electrode, a graphite electrode, a tin dioxide electrode and a boron-doped diamond film electrode;
the reaction kettle serves as a cathode;
the red mud particle electrodes are distributed at the upper part or the lower part of the reaction kettle cavity;
preferably, the wet electro-oxidative degradation conditions are as follows: the reaction temperature is 240-300 ℃; the reaction pressure is 5.5MPa to 9.0 MPa; the current density is 10 to 30mA/cm2(ii) a The oxygen flow is 20-50 mL/min; the mass airspeed of the organic wastewater is 1-6 h-1。
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