CN113477699A - Electric Fenton method for repairing polycyclic aromatic hydrocarbon in soil by in-situ self-production of oxidant - Google Patents
Electric Fenton method for repairing polycyclic aromatic hydrocarbon in soil by in-situ self-production of oxidant Download PDFInfo
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Abstract
The invention relates to an electric Fenton method for repairing in-situ self-produced oxidants of polycyclic aromatic hydrocarbons in soil, which comprises the following specific steps: step 1, preparing a gas diffusion cathode; step 2, transferring the polluted soil to an electric restoration device; step 3, arranging a cathode/anode electrode pair in electrode chambers at two ends of the polluted soil; step 4, installing ion exchange membranes between the cathode/anode and the soil; step 5, arranging a zero-valent iron reaction wall at the anode of the cathode/anode electrode pair; step 6, a direct current electric field is applied to the arranged cathode/anode electrode pair to repair and remove the polycyclic aromatic hydrocarbon in the soil; the electric Fenton method has the advantages that no exogenous oxidant is needed, and the electrode is used for reducing oxygen in situ to generate H2O2The method has the advantages of low energy consumption, low cost, simple process and the like.
Description
Technical Field
The invention belongs to the technical field of environment and soil remediation, and particularly relates to an electric Fenton method for remediating an in-situ self-produced oxidant of polycyclic aromatic hydrocarbon in soil.
Background
With the widespread use of coal and petroleum in industrial production, transportation and life, polycyclic aromatic hydrocarbons have become an organic pollutant of common concern in countries in the world. Due to the hydrophobic property of the polycyclic aromatic hydrocarbon, the soil becomes the final destination of most polycyclic aromatic hydrocarbon, and the pollution of the polycyclic aromatic hydrocarbon can bring serious environmental health risks, the half-life period of the polycyclic aromatic hydrocarbon is extremely long, the polycyclic aromatic hydrocarbon is not easy to degrade, and the polycyclic aromatic hydrocarbon is a persistent organic pollutant. Polycyclic aromatic hydrocarbons have carcinogenic, teratogenic and mutagenic effects and are very toxic to human bodies. At present, how to repair the pollution of the polycyclic aromatic hydrocarbon becomes a technical problem which is widely concerned by various countries in the world.
The remediation technology of the soil polluted by the polycyclic aromatic hydrocarbon comprises methods such as thermal desorption, bioremediation, chemical oxidation and leaching. Among them, chemical oxidation, especially fenton oxidation, is widely concerned and applied. The fenton oxidation technology utilizes the fenton reaction of iron and hydrogen peroxide to generate hydroxyl radical (HO. cndot.) with high oxidation, HO, which can efficiently degrade polycyclic aromatic hydrocarbon. However, in the actual soil remediation process, the permeability of the soil and the diffusion coefficient of the fenton reagent are low, which is not enough to ensure the migration of the reaction reagent in the soil, and the remediation efficiency often fails to reach the target. Electrokinetic remediation techniques have been developed in recent decades, inserting anodes and cathodes in the soil and applying an electric field. Under the action of an electric field, two mechanisms of electroosmosis and electromigration mainly exist in soil. Electroosmotic flow is the movement of liquid in the pores of the soil from the anode to the cathode, electroosmotic flow is the movement of charged ions in the soil towards the oppositely charged electrode. The electric restoration and Fenton oxidation technology (electric Fenton technology for short) are combined, so that electroosmotic flow and electromigration generated by an electric field can be utilized to ensure that a Fenton reagent is transferred in soil and is fully contacted with pollutants, and the efficiency of the electric restoration is improved.
However, the existing electro-fenton technology has some obvious defects, and the electrode generates degradation oxidant in the process of the electro-fenton technology, so that the loss of the oxidant and the increase of the repair cost are caused; in addition, a large amount of oxidant is often added in the repair process to achieve the repair goal, which increases the cost of purchasing, transporting and storing the oxidant.
For example, chinese patent application No. CN201911140578.6 discloses the name of the invention: organic chlorine in soil is got rid of in cooperation of electronic restoration to chelating agent reinforcing advanced oxidationThe invention relates to a method for preparing a compound, which is characterized in that nano zero-valent iron is arranged near an anode of an electric repairing device, and the mass concentration of hydrogen peroxide added into an electrode chamber is 5%. The nano zero-valent iron with high specific surface area and reaction activity can more quickly and effectively activate the oxidant to degrade pollutants and accelerate Fe in soil2+、Fe3+Cyclic reaction of (2), continuous supply of Fe to the system2+Thereby improving the efficiency of the oxidation reaction. The above invention combines electrokinetic remediation and fenton's oxidation to increase remediation efficiency, however the exogenous addition of high concentrations of hydrogen peroxide is associated with the expense of purchase, transportation and storage.
For example, the invention is an ion membrane reinforced electric oxidation repairing method for organic contaminated soil as disclosed in chinese patent application No. CN201710470803.7, the invention installs an ion exchange membrane between an electrode and soil, and the concrete steps are: and arranging an anion/cation electrode pair at two ends of the polluted soil, installing an ion exchange membrane between the electrode and the soil, adding an oxidant to an area between the ion exchange membrane and the soil, and introducing a direct current electric field for treatment to finish the restoration. The mass concentration of the oxidant is 0.1-20%, and the oxidant is persulfate. The results show that the cation exchange membrane is arranged in the cathode region, so that the higher ORP of the system can be ensured to effectively reduce S2O8 2-Increase S in the system2O8 2-To facilitate the removal of organic contaminants. However, the invention only installs the cation exchange membrane at the cathode, and does not consider the degradation of the anode to the oxidant; and for the hydrogen peroxide used in the electro-Fenton technology, no relevant inventions and documents are found to research the consumption of the hydrogen peroxide in the electrode.
In view of the problems in the prior art, there is a strong need for an electrokinetic remediation and fenton oxidation process that can self-generate hydrogen peroxide in situ and reduce the loss of hydrogen peroxide, thereby improving the utilization efficiency of hydrogen peroxide and reducing the cost of oxidant purchase.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an electric Fenton method for repairing in-situ self-produced oxidants of polycyclic aromatic hydrocarbons in soil, which comprises the following specific steps:
and 6, applying a direct current electric field to the arranged cathode/anode electrode pair to repair and remove the polycyclic aromatic hydrocarbon in the soil.
Further, the step 1 of preparing the gas diffusion cathode comprises the following steps:
step 1.1, soaking a 6 x 4cm carbon felt in a 2% PTFE solution, and placing the 2% PTFE solution in an ultrasonic instrument for ultrasonic treatment for 30min to ensure that the carbon felt is fully soaked in the 2% PTFE solution;
step 1.2, taking out the carbon felt, placing the carbon felt in a drying oven at 80 ℃ for at least 8h, and placing the dried carbon felt in a muffle furnace to calcine for 30min at 350 ℃ for later use;
step 1.3, placing the CMK3 (mesoporous carbon) material in a microwave oven to be processed for 20s at 100W, taking out and immediately grinding the material for 40s by using liquid nitrogen for later use;
step 1.4, 0.2g of the processed CMK3 material is mixed with 0.27mL of 60% PTFE and 10mL of absolute ethyl alcohol, and the mixture is placed in a water bath kettle to be stirred and heated at 70 ℃ to be pasty;
step 1.5, uniformly rolling and coating the paste obtained in the step 1.4 on the carbon felt obtained in the step 1.2, and putting the carbon felt on a tablet press to press and cover for 10min at 10 MPa;
and step 1.6, calcining the electrode precursor obtained in the step 1.5 in a muffle furnace at 350 ℃ for 30min to obtain the CMK3/CF gas diffusion cathode.
Further, the gas diffusion cathode prepared in step 1 is applied with a catalyst, and the catalyst is any one of carbon black, carbon nanotubes, carboxylated carbon nanotubes and CMK 3.
Further, step 2 said electric repairing deviceThe device comprises the following components: the length, width and height of the central compartment are respectively 15cm, 8cm and 10cm, and the soil treatment capacity of the central compartment is 1.2dm3The middle of the electrode chamber is provided with an interlayer for installing an ion exchange membrane, and each electrode chamber is connected with a chamber with the capacity of 0.6dm3The reservoir is used to receive excess electrolyte.
Further, in step 3, a cathode/anode electrode pair is arranged in the electrode chambers at two ends of the contaminated soil, and the steps are as follows:
step 3.1, mounting the gas diffusion electrode prepared in the step 1 as a cathode to the right half part of a cathode chamber of the electric restoration device;
and 3.2, installing graphite plates with the length, width and thickness of 4cm, 4c and 0.5cm as anodes to the left half part of the anode chamber of the electric repairing device.
Further, in the step 4, ion exchange membranes are respectively arranged between the cathode/anode and the soil, the two ion exchange membranes are respectively arranged at the middle interlayers of the anode chamber and the cathode chamber, the interlayers are two porous organic glass plates, the length, width and thickness of each porous glass plate are respectively 6cm, 6cm and 1mm, the ion exchange membranes are clamped by the two porous organic glass plates and are fixed by screws, and the length and width of each ion exchange membrane are 8cm and 8 cm.
Further, step 5 of arranging a zero-valent iron reaction wall at the anode includes the following steps:
step 5.1, filling 1g of zero-valent iron powder in the folded filter paper, and then inserting the filter paper into the contaminated soil along the longitudinal section of the repairing device;
and 5.2, placing the filter paper filled with the zero-valent iron powder at the position 5cm away from the left end of the soil chamber for continuously releasing ferrous ions, wherein the ferrous ions continuously move towards the cathode direction under the action of an electric field and react with hydrogen peroxide to generate hydroxyl radicals.
Further, the voltage of the direct current electric field applied to the cathode/anode pair in the step 6 is 10-20V.
The electric Fenton method has the following excellent technical effects:
1. the electric dunfen method of the invention does not need an external oxidant,production of H by in-situ reduction of oxygen using electrodes2O2The method has the advantages of low energy consumption, low cost, simple process and the like.
2. The electric Fenton method introduces the cation exchange membrane, can obviously reduce the loss of the oxidant at the electrode and increase the utilization efficiency of the oxidant.
3. The electric Fenton method utilizes the zero-valent iron reaction wall as an iron source, and can continuously release ferrous iron and hydrogen peroxide to react to generate hydroxyl radicals to degrade polycyclic aromatic hydrocarbon.
4. The gas diffusion cathode in the electric Fenton method can be repeatedly used, and the repair cost of the electric Fenton method is obviously reduced.
Drawings
FIG. 1 is a schematic view of an electromotive Fenton apparatus for a cathode-anode ion exchange membrane according to example 1;
FIG. 2a, FIG. 2b, FIG. 2c, and FIG. 2d are respectively a diagram of H in the ion membrane technique for electro-Fenton coupling in example 12O2A schematic of migration and consumption;
FIG. 3 is a comparison diagram of the repairing of anthracene-contaminated quartz sand by the electro-Fenton coupling ion-membrane technique of example 1;
FIGS. 4a and 4b are SEM images of CMK3/CF electrodes synthesized in example 2;
FIG. 5 is a schematic view of the structure of an electric Fenton apparatus for self-generating an oxidant in example 3;
FIG. 6 shows CMK3/CF electro-Fenton-based H in example 32O2A schematic of cumulative concentration;
FIG. 7 is a schematic diagram of the CMK 3/CF-based electro-Fenton repair of anthracene-contaminated quartz sand in example 3;
FIG. 8 is a schematic diagram of the removal rate of soil polluted by anthracene, pyrene and benzanthracene by CMK 3/CF-based electro-Fenton in example 4.
Detailed Description
The following detailed description will be made with reference to the accompanying fig. 1-8 of the specification for a specific embodiment of the electro-kinetic remediation fenton oxidation method according to the present invention.
Example 1:
FIG. 1 is a schematic diagram of a cathode-anode ion exchange membrane (CEM) repairing device, wherein an anode pool is divided into solution pools of A1 and A2 areas by an ion exchange membrane d, a cathode pool is divided into solution pools of C1 and C2 areas, 600g of quartz sand is filled into a soil chamber, the soil is divided into four parts from the anode to the cathode on average from S1 to S4, a to C are respectively liquid pools corresponding to electrode chambers, the anode and the cathode are made of graphite, a direct current power supply is connected with the electrodes to form a circuit loop, the solutions of A1 and C1 areas are connected with the liquid pools a and b by peristaltic pumps, the solutions of A2 and C2 areas are connected with the liquid pool C by peristaltic pumps, a permeable reactive wall of zero-valent iron is inserted at an e position 3cm close to the anode to provide an iron source, the experimental design is divided into T1-T4, T1 is not provided with a cation exchange membrane, T2 is provided with a cation exchange membrane at the anode, T3 is provided with a cation exchange membrane at the cathode, T4 is provided with a cation exchange membrane at the cathode and the anode, and 0.1M hydrogen peroxide solution is added into the liquid storage tank c, the quartz sand columns are balanced for 2 hours by using 0.05mol/L Na2SO4 before the experiment begins, the required electrolyte is replaced, 4 soil solution collectors are embedded in each group of quartz sand columns, the soil solution and the electrolyte of the two poles are extracted every other hour, and the concentration of the hydrogen peroxide in the solution is measured. Fig. 2a, 2b, 2c, and 2d are schematic diagrams illustrating migration and consumption of H2O2 in the electro-fenton-coupled ionic membrane technology of example 1, respectively, wherein fig. 2a shows that in the control group T1 without an ion exchange membrane, the hydrogen peroxide concentrations in the soils S1-S4 slowly increase within the first 4 hours, and then, as the electrode consumes the hydrogen peroxide, the hydrogen peroxide concentrations in the four parts of the soil all significantly decrease and completely decrease to 0 within 8 hours, thus confirming that the consumption of the electrode to the oxidant in the electro-dynamic remediation is very serious; FIGS. 2b-2c show that in control T2 and T3 where the anode and cathode are added with ion exchange membranes, respectively, the hydrogen peroxide concentration in the soil component is also gradually increased, but after 12 hours, the hydrogen peroxide concentration is decreased to 16-30% of the initial concentration, respectively, indicating that the addition of the ion exchange membrane to the cathode or anode alone is not effective in preventing the loss of the oxidant to the cathode or anode, while in T4 where the cathode and anode are added with the ion exchange membrane simultaneously, the hydrogen peroxide concentration in the soil after 24 hours is not significantly changed from the initial concentration, and as shown in FIG. 2d, it is confirmed that the electrokinetic technique of the cathode and anode ion exchange membrane treatment can substantially completely inhibit the loss of the oxidant to the cathode and anode; fig. 3 shows that the removal rates of the cathode and the anode without the ion exchange membrane and with the cathode and the anode with the ion exchange membrane to anthracene are significantly different, and the removal rates of the cathode and the anode with the ion exchange membrane to anthracene are respectively improved by 13.7%, 34.1%, 42.5% and 41.2% compared with the removal rates of the cathode and the anode with the ion exchange membrane to anthracene of the control group. Proves that the cathode and anode ion exchange membrane can inhibit the consumption of hydrogen peroxide, increase the use efficiency of the oxidant and the repair effect of the polycyclic aromatic hydrocarbon.
Example 2:
the preparation method of the gas diffusion cathode capable of generating hydrogen peroxide in situ comprises the following steps:
and 6, calcining the electrode obtained in the fifth step in a muffle furnace at 350 ℃ for 30min to obtain the CMK3/CF gas diffusion cathode.
Fig. 4 is an SEM image of a synthesized CMK3/CF gas diffusion cathode, and it can be seen that both the fibrous structure inside the carbon felt and the layered CMK3 structure are covered by a white PTFE film, which can greatly increase the hydrophobicity of the electrode and avoid the loss of electrode performance caused by the permeation of electrolyte to the electrode.
Example 3:
in-situ electrokinetic-Fenton repair of anthracene-contaminated quartz sand based on CMK3/CF gas diffusion cathode, as shown in FIG. 5, wherein an anode pool is divided into solution pools of A1 and A2 by a cation exchange membrane d, a cathode pool is divided into solution pools of C1 and C2, 600g of 50mg/kg anthracene-contaminated quartz sand is filled into a soil chamber, the soil chamber is divided into four parts of S1-S4 on average from anode to cathode, a and C are respectively reservoirs corresponding to electrode chambers, the anode is graphite, the cathode (f) is a CMK3/CF gas diffusion cathode, a direct current power supply is connected with the electrodes to form a circuit loop, the solution of A1 area is connected with a solution pool a by a peristaltic pump, the solution of A2, C1 and C2 areas is connected with a solution pool C by a peristaltic pump, a permeation reaction wall of zero-valent iron is inserted at e 3cm near the anode to provide an iron source, a quartz sand column Na2SO4 of 0.05mol/L is used for balancing quartz sand 2h before the start of an experiment, and 4 soil solution collectors are embedded in each group of quartz sand columns, soil solution and two-pole electrolyte are extracted every other hour, the concentration of hydrogen peroxide in the solution is measured, and the anthracene concentration of the quartz sand is measured after the experiment is finished.
FIG. 6 shows that CMK3/CF gas diffusion cathode can continuously generate hydrogen peroxide, and the hydrogen peroxide flows into a c liquid storage tank and an A2 tank through a peristaltic pump, finally enters quartz sand through electroosmotic flow, after 3 days of reaction, the hydrogen peroxide concentration of S1-S4 parts in soil is as high as 138.14-145.26mM, the mechanism can be attributed to the high activity and stability of a CMK3/CF electrode, oxygen in reduction electrolyte can be generated and reduced into hydrogen peroxide all the time in the reaction period, meanwhile, an ion exchange membrane of a cathode and an anode can avoid the loss of an oxidant on the electrode, the concentration of the hydrogen peroxide is maintained, 50mg/kg of anthracene-polluted quartz sand is used as a reaction medium, FIG. 7 shows that the removal rate of anthracene is as high as 98% after 3 days of repair, and the feasibility of an electro-Fenton technology based on self-generated oxidant of the CMK3/CF electrode is proved.
Example 4:
in-situ electrokinetic-fenton remediation of polycyclic aromatic hydrocarbon contaminated soil based on a CMK3/CF gas diffusion cathode, as shown in FIG. 5, wherein an anode pool is divided into solution pools in areas A1 and A2 by a cation exchange membrane d, a cathode pool is divided into solution pools in areas C1 and C2, 600g of soil contaminated by anthracene, pyrene and benzanthracene is filled into a soil chamber, the soil chamber is divided into four parts S1-S4 on average from the anode to the cathode, the particle size of the soil is 20 meshes, the initial pH is 8.3, the content of organic matters is 3%, a and C are respectively solution pools corresponding to electrode chambers, the anode is graphite, the cathode (f) is a CMK3/CF gas diffusion cathode, a direct current power supply is connected with the electrodes to form a circuit loop, the solution in area A1 is connected with the solution pool a by a peristaltic pump, the peristaltic solutions in areas A2, C1 and C2 are connected with the solution pool C by a pump, a zero-valent iron infiltration reaction wall is inserted at a position e 3cm near the anode to provide an iron source, the soil column was equilibrated for 2h with 0.05mol/L Na2SO4 before the start of the experiment, and the concentrations of three polycyclic aromatic hydrocarbons in the soil were determined after the end of the experiment.
FIG. 8 shows that after 10 days of reaction, the removal rate of three polycyclic aromatic hydrocarbons in the soil from S1 to S4 reaches 91.08 to 96.18%, which proves that the electrokinetic-Fenton technology based on the CMK3/CF electrode in-situ self-generated oxidant in the actual soil still has higher remediation efficiency. Compared with an electric Fenton technology of adding an oxidant from an external source, the electric repairing Fenton oxidation method can utilize the electrode to produce the oxidant in situ, obviously reduces the cost of soil repairing, is simple and convenient to operate, and has obvious advantages.
The present invention is not limited to the above-described embodiments, and any variations, modifications, and alterations that may occur to one skilled in the art without departing from the spirit of the invention are intended to be within the scope of the invention.
Claims (9)
1. An electric Fenton method for repairing polycyclic aromatic hydrocarbon in soil by in-situ self-production of an oxidant is characterized by comprising the following steps:
step 1, preparing a gas diffusion cathode;
step 2, transferring the polluted soil to an electric restoration device;
step 3, arranging a cathode/anode electrode pair in electrode chambers at two ends of the polluted soil;
step 4, installing ion exchange membranes between the cathode/anode and the soil;
step 5, arranging a zero-valent iron reaction wall at the anode of the cathode/anode electrode pair;
and 6, applying a direct current electric field to the arranged cathode/anode electrode pair to repair and remove the polycyclic aromatic hydrocarbon in the soil.
2. The electro-Fenton's process for remediation of in situ self-generated oxidants from polycyclic aromatic hydrocarbons in soil of claim 1, step 1 of preparing a gas diffusion cathode, comprising the steps of:
step 1.1, soaking a 6 x 4cm carbon felt in a 2% PTFE solution, and placing the 2% PTFE solution in an ultrasonic instrument for ultrasonic treatment for 30min to ensure that the carbon felt is fully soaked in the 2% PTFE solution;
step 1.2, taking out the carbon felt, placing the carbon felt in a drying oven at 80 ℃ for at least 8h, and placing the dried carbon felt in a muffle furnace to calcine for 30min at 350 ℃ for later use;
step 1.3, placing the CMK3 (mesoporous carbon) material in a microwave oven to be processed for 20s at 100W, taking out and immediately grinding the material for 40s by using liquid nitrogen for later use;
step 1.4, 0.2g of the processed CMK3 material is mixed with 0.27mL of 60% PTFE and 10mL of absolute ethyl alcohol, and the mixture is placed in a water bath kettle to be stirred and heated at 70 ℃ to be pasty;
step 1.5, uniformly rolling and coating the paste obtained in the step 1.4 on the carbon felt obtained in the step 1.2, and putting the carbon felt on a tablet press to press and cover for 10min at 10 MPa;
and step 1.6, calcining the electrode precursor obtained in the step 1.5 in a muffle furnace at 350 ℃ for 30min to obtain the CMK3/CF gas diffusion cathode.
3. The electro-Fenton's process for remediation of in situ oxidants self-generated from polycyclic aromatic hydrocarbons in soil of claim 1, wherein the step 1 of preparing the gas diffusion cathode applies a catalyst, the catalyst being carbon black, carbon nanotubes, carboxylated carbon nanotubes or CMK 3.
4. The electro-Fenton's process for remediation of in situ oxidants self-generated from polycyclic aromatic hydrocarbons in soil of claim 1, wherein step 2 the electro-kinetic remediation device is configured to: the length, width and height of the central compartment are respectively 15cm, 8cm and 10cm, and the soil treatment capacity of the central compartment is 1.2dm3The middle of the electrode chamber is provided with an ion exchange membrane interlayer, and each electrode chamber is connected with a separator with the capacity of 0.6dm3The reservoir is used to receive excess electrolyte.
5. The electro-Fenton method for remediating polycyclic aromatic hydrocarbons in situ from the generated oxidants in the soil as set forth in claim 1, wherein step 3 is to provide a cathode/anode electrode pair in the electrode chambers at both ends of the contaminated soil, and the steps are as follows:
step 3.1, mounting the gas diffusion electrode prepared in the step 1 as a cathode to the right half part of a cathode chamber of the electric restoration device;
and 3.2, installing graphite plates with the length, width and thickness of 4cm, 4c and 0.5cm as anodes to the left half part of the anode chamber of the electric repairing device.
6. An electro-Fenton's process for remediation of in situ oxidants from polycyclic aromatic hydrocarbons in soils as claimed in claim 1 wherein step 4 comprises installing ion exchange membranes between the cathode/anode and the soil, the ion exchange membranes being installed in the interlayer of the anode chamber and the cathode chamber, respectively, and the ion exchange membranes having a length of 8cm and a width of 8 cm.
7. The electro-Fenton method for remediating polycyclic aromatic hydrocarbons in situ from the generated oxidants in soil as set forth in claim 1, wherein the step 5 of providing a zero-valent iron reaction wall at the anode comprises the steps of:
step 5.1, filling 1g of zero-valent iron powder in the folded filter paper, and then inserting the filter paper into the contaminated soil along the longitudinal section of the repairing device;
and 5.2, placing the filter paper filled with the zero-valent iron powder at the position 5cm away from the left end of the soil chamber for continuously releasing ferrous ions, wherein the ferrous ions move towards the cathode direction under the action of an electric field and react with hydrogen peroxide to generate hydroxyl radicals.
8. The electro-Fenton's process for remediation of in situ oxidants from polycyclic aromatic hydrocarbons in soils in accordance with claim 1, wherein step 6 provides a DC field applied to the cathode/anode pair at a voltage of 10-20V.
9. The electro-Fenton method for remediating in situ generated oxidants of polycyclic aromatic hydrocarbons in soil as set forth in claim 4, wherein the interlayer is two sheets of porous organic glass plates, the length, width and thickness of the porous glass plates are 6cm, 6cm and 1mm, respectively, the ion exchange membrane is clamped by the two sheets of porous organic glass plates, and the two sheets of porous organic glass plates are fixed by screws.
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| CN114192562A (en) * | 2021-11-19 | 2022-03-18 | 中国科学院南京土壤研究所 | Method for removing polycyclic aromatic hydrocarbons in soil by combining electric remediation with anodic oxidation |
| CN114192562B (en) * | 2021-11-19 | 2023-02-24 | 中国科学院南京土壤研究所 | Method for removing polycyclic aromatic hydrocarbons in soil by combining electric remediation with anodic oxidation |
| CN114101313A (en) * | 2021-11-23 | 2022-03-01 | 北控水务(中国)投资有限公司 | Device for repairing soil polluted by refractory organic matters through double-cathode electro-Fenton oxidation |
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Application publication date: 20211008 |