CN114192562A - Method for removing polycyclic aromatic hydrocarbons in soil by combining electric remediation with anodic oxidation - Google Patents

Method for removing polycyclic aromatic hydrocarbons in soil by combining electric remediation with anodic oxidation Download PDF

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CN114192562A
CN114192562A CN202111401994.4A CN202111401994A CN114192562A CN 114192562 A CN114192562 A CN 114192562A CN 202111401994 A CN202111401994 A CN 202111401994A CN 114192562 A CN114192562 A CN 114192562A
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soil
chamber
electrode
anode
cathode
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CN114192562B (en
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高娟
楚龙港
仓龙
孙昭玥
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Institute of Soil Science of CAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/08—Reclamation of contaminated soil chemically
    • B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

The invention relates to a method for removing polycyclic aromatic hydrocarbons in soil by combining electrokinetic remediation and anodic oxidation, which comprises the following steps: step 1, preparing Ti capable of generating hydroxyl in situ by spark plasma sintering technology4O7Electrode preparation of Ti4O7An electrode; step 2, arranging an electric repairing device; step 3, transferring the polluted soil to an electric restoration device; step 4, inserting a cathode/anode electrode pair into electrode chambers at two ends of the polluted soil; step 5, introducing a direct current electric field to the electrode chambers at two ends of the polluted soil for treatment, and then completing restoration; the method has the advantages that the corresponding electric restoration device can be developed aiming at different types of soil, is suitable for restoring the polluted soil of sandy soil, red soil and moist soil, has wide application range, and the restored soil has no oxidant residue and uses Ti4O7The electrode can be reused.

Description

Method for removing polycyclic aromatic hydrocarbons in soil by combining electric remediation with anodic oxidation
Technical Field
The invention belongs to the field of soil remediation, and particularly relates to a method for removing soil polycyclic aromatic hydrocarbons by combining electric remediation and anodic oxidation.
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 nature of polycyclic aromatic hydrocarbons, soil becomes the ultimate sink for most polycyclic aromatic hydrocarbons and poses serious environmental health risks as a source of polycyclic aromatic hydrocarbon contamination. The polycyclic aromatic hydrocarbon has extremely long half-life period and is not easy to degrade, and is a persistent organic pollutant, the polycyclic aromatic hydrocarbon has carcinogenic, teratogenic and mutagenic effects and very serious toxic and harmful effects on human bodies, and the problem that how to repair the polycyclic aromatic hydrocarbon pollution is widely concerned in the world at present is solved.
The remediation technology of the soil polluted by the polycyclic aromatic hydrocarbon comprises methods such as thermal desorption, bioremediation, chemical oxidation and leaching. Wherein, the chemical oxidation technology is widely concerned due to the advantages of convenience, rapidness, safety, low cost and the like. However, in actual soil remediation, the permeability of soil and the diffusion coefficient of chemical agents are low, which is not enough to ensure the migration of the reaction agent in soil, and the remediation efficiency is not targeted. In recent decades, the combination of electric remediation and chemical oxidation technology (electric oxidation) is developed, so that chemical reagents can be guaranteed to migrate in soil and fully contact with pollutants, and the efficiency of oxidation remediation is improved. However, electrokinetic oxidation techniques require the input of large quantities of oxidizing agents, such as hydrogen peroxide (H), into the soil2O2) Persulfate (Na)2S2O8) Potassium permanganate (KMnO)4) The repair efficiency can be guaranteed.
For example, chinese invention patent application No. cn202010746300.x discloses the name of the invention: a method for removing petroleum hydrocarbon in soil through persulfate cooperated with electrokinetic remediation is characterized in that contaminated soil is filled into a soil chamber of an electrokinetic remediation device, a sodium chloride solution with the soil volume of 70% is added for balancing, and the balancing treatment time is 24 hours; after the balance is finished, adding appropriate amounts of catholyte and anolyte to a cathode chamber and an anode chamber of the electric restoration device respectively; the electric device was started, and the voltage was set to 20V to perform the electric restoration process. The method strengthens the effect of removing petroleum hydrocarbon by persulfate oxidation through the synergistic action of complexation solubilization and electromotion, and 2Mol of sodium persulfate solution needs to be added into an electrode chamber although the removal efficiency of the petroleum hydrocarbon is improved.
For another example, chinese patent CN201911140578.6 discloses a method for removing organochlorine compounds in soil by chelating agent enhanced advanced oxidation in coordination with electrokinetic remediation, and relates to a method for removing organochlorine compounds in soil by chelating agent enhanced advanced oxidation in coordination with electrokinetic remediation, which comprises: 1) transferring the polluted soil to an electric restoration device, adding an oxidant and glutamic acid N, N-diacetic acid into the soil, and arranging nano zero-valent iron near the anode of the electric restoration device; 2) adjusting the pH value of the electrolyte, and starting an electric repairing device to remove organic chlorine compounds in the soil. The oxidant is at least one of persulfate, hydrogen peroxide, permanganate and hypochlorite. The method is based on the combined treatment mode of electric restoration, nano zero-valent iron, oxidant and glutamic acid N, N-diacetic acid to cooperatively remove the organochlorine pollutants in the soil, can greatly improve the removal rate of the organochlorine pollutants in the soil and can simultaneously remove the organochlorine pollutants in situ, but the method has the defects that: the nano zero-valent iron is arranged near the anode of the electric repairing device, and the mass concentration of the hydrogen peroxide added into the electrode chamber is 5%.
For another example, chinese patent application No. CN202010041353.1 discloses a method for removing persistent organic pollutants in soil by triton TX-100 enhanced advanced oxidation in cooperation with electrokinetic remediation, the method comprising the steps of: 1) transferring the contaminated soil to an electric remediation device, and adding an oxidant and triton TX-100 to the soil; 2) adjusting the pH value of the electrolyte, and starting the electric repairing device to remove the persistent organic pollutants in the soil. The oxidant is at least one of persulfate, hydrogen peroxide, permanganate and hypochlorite, the persistent organic pollutants in the soil are synergistically removed based on a combined treatment mode of electrokinetic remediation + oxidant + triton TX-100, the removal rate of the persistent organic pollutants in the soil can be greatly improved, and persulfate with the mass concentration of 20% needs to be added. The use of a large amount of oxidant in the electrokinetic oxidation technology increases the repair cost, and meanwhile, certain environmental risks exist in the processes of transporting, storing and applying the oxidant. In addition, the use of a large amount of oxidants in the soil can cause serious influence on the physicochemical properties of the soil, and cause the pH value of the soil to be lowered, minerals to be dissolved, organic matters to be decomposed and the like; and harms local microbial communities and reduces microbial diversity.
In view of the above problems in the prior art, there is a strong need for an electromotive repairing method capable of self-generating radicals in situ and avoiding the use of an oxidizing agent.
Disclosure of Invention
In order to solve the problems, the invention provides a method for removing polycyclic aromatic hydrocarbons in soil by combining electrokinetic remediation and anodic oxidation, which comprises the following steps:
step 1, preparing Ti capable of generating hydroxyl in situ by spark plasma sintering technology4O7Electrode preparation of Ti4O7An electrode;
step 2, arranging an electric repairing device;
step 3, transferring the polluted soil to an electric restoration device;
step 4, inserting a cathode/anode electrode pair into electrode chambers at two ends of the polluted soil;
and 5, introducing a direct current electric field to the electrode chambers at the two ends of the polluted soil, and finishing the restoration.
Further, the step 1 of preparing Ti by spark plasma sintering4O7An electrode comprising the steps of:
step 1.1, 2g of Ti4O7The powder is filled in a graphite die, and an instrument vacuum device is started to ensure that the pressure is less than 1 MPa;
step 1.2, sintering Ti4O7A powder, wherein: heating the graphite mold to 600 ℃ within 1-5 minutes; within 5-13 minutes, the temperature is raised to 600-1000 ℃; the temperature is raised to 1000-100 ℃ within 13-17 minutes; maintaining the temperature at 1100 ℃ for 17-37 minutes; cooling to below 60 ℃ within 37-75 minutes;
step 1.3, Ti obtained in step 1.24O7And cleaning the electrode with water and ethanol, and drying for later use.
Further, step 2 of providing the electric repairing device comprises the following steps:
step 2.1, arranging an anode chamber A and a cathode chamber C at the left end and the right end for containing electrolyte and inserting electrodes, wherein the capacity of an electrode chamber is 0.8L (8cm multiplied by 10 cm);
step 2.2, the anode chamber A and the cathode chamber C are respectively connected with a liquid storage tank a and a liquid storage tank C with the capacity of 1L (10cm multiplied by 10cm) and used for collecting excessive electrolyte;
step 2.3, arranging a soil chamber between the anode chamber A and the cathode chamber C, and averagely dividing the soil chamber from the anode to the cathode into: s1, S2, S3 and S4;
and 2.4, setting the soil repairing capacity of the soil chamber to reach 1.6L, wherein the length, width and height of the soil chamber are respectively 10cm multiplied by 16cm multiplied by 10 cm.
Further, the step 3 of transferring the contaminated soil to an electric remediation device comprises the following steps:
step 3.1, 600g of contaminated soil is filled into a soil chamber S1-S4 of the electric restoration device and compacted, and the filling density is 1.3g/cm3；
3.2, inserting a cation exchange membrane in the middle of an anode chamber of the electric repairing device, and dividing the anode chamber A into two half-electrode chambers A1 and A2 which are equal;
step 3.3, adding a surfactant solution with the mass fraction of 1% into the A2 electrode chamber for dissolving phenanthrene in soil and moving to the cathode chamber C along with electroosmosis flow, wherein the surfactant is Tween 80 or Triton X-100;
step 3.4, connecting the liquid storage tank of the cathode chamber C with the liquid storage tank of the anode chamber A1, enabling phenanthrene flowing to the cathode chamber in the repairing process to flow to the anode chamber A1, and enabling the cation exchange membrane of the anode chamber to prevent phenanthrene from flowing to the A2 chamber and entering the soil again;
step 3.5, add 0.1M Na to anode chamber A1 and cathode chamber C2SO4As an electrolyte.
Further, the contaminated soil in the step 3 is moisture soil.
Further, if the contaminated soil in step 3 is sandy soil, step 3.2 is: inserting a cation exchange membrane in the middle of the cathode chamber of the electric repairing device, and dividing the cathode chamber C into two half-electrode chambers C1 and C2 which are equal, wherein the HO-generated in the cathode chamber is inhibited from entering the soil; step 3.3, adding a surfactant solution with the mass fraction of 1% into the cathode chamber C;
further, if the contaminated soil in the step 3 is red soil, the step 3.2 is as follows: adding a pH automatic controller in a cathode chamber of the electric repairing device for regulating the pH of the cathode chamber to be within a range of 3.5-4.0; step 3.3 is: and adding a surfactant solution with the mass fraction of 1% into the cathode chamber C.
Further, the inserted anode in step 4 is Ti4O7The electrode or Ti electrode, and the inserted cathode is a common power graphite electrode.
Further, the voltage of the direct current electric field applied between the cathode/anode electrode pair of the electrode chamber at the two ends of the contaminated soil in the step 5 is 10-20V.
Further, the energizing time of the direct current electric field applied between the cathode/anode electrode pair of the electrode chamber at the two ends of the contaminated soil in the step 5 is 240 hours.
Compared with the method for removing the polycyclic aromatic hydrocarbon in the soil by combining electric restoration and anodic oxidation, the method for removing the polycyclic aromatic hydrocarbon in the soil has the following excellent technical effects:
1. the method for removing the polycyclic aromatic hydrocarbon in the soil by using the electric remediation and anodic oxidation combined method does not need an external oxidant, utilizes the electrode to crack water in situ to generate hydroxyl radicals, and has the advantages of no pollution, low cost, simple process and the like.
2. The method for removing the polycyclic aromatic hydrocarbon in the soil by combining the electric restoration and the anodic oxidation is suitable for restoring the polluted soil of sandy soil, red soil and moist soil and has wide application range, and a plurality of electric restoration devices are developed aiming at different types of soil.
3. By using the method for removing the polycyclic aromatic hydrocarbon in the soil by combining the electric restoration and the anodic oxidation, the restored soil has no oxidant residue and has small harm to the physical and chemical properties of the soil.
4. The Ti used in the method for removing the polycyclic aromatic hydrocarbon in the soil by combining electric remediation and anodic oxidation4O7The electrode can be reused.
Drawings
FIG. 1 is a schematic structural diagram of a method for removing polycyclic aromatic hydrocarbons from soil by combining electrokinetic remediation and anodic oxidation;
FIG. 2 is Ti4O7A schematic electrochemical characterization of the electrode;
FIG. 3 is Ti4O7A hydroxyl generating rate diagram of the electrode;
FIG. 4 is a schematic structural diagram of a device for remediating phenanthrene-polluted sandy soil;
FIG. 5 is a graph showing the control of phenanthrene concentration eluted from sandy soil;
FIG. 6 is a schematic diagram of the efficiency of repairing the phenanthrene-polluted sandy soil;
FIG. 7 is a schematic structural diagram of a device for remediating phenanthrene-contaminated moisture soil;
FIG. 8 is a graph showing control of the concentration of phenanthrene eluted from the soil;
FIG. 9 is a schematic view of the effectiveness of soil remediation;
FIG. 10 is a schematic structural diagram of a device for remediating phenanthrene-contaminated red soil;
FIG. 11a is a graph showing phenanthrene concentration eluted from red soil;
FIG. 11b is a schematic representation of red soil remediation efficiency.
Detailed Description
In order to more clearly understand the above objects, features and advantages of the present invention, the following detailed description of Ti prepared by the method for removing polycyclic aromatic hydrocarbons from soil by electrokinetic remediation and anodic oxidation combined with the present invention is provided with reference to the attached drawings4O7The application conditions of the electrodes and the Ti electrodes of the control group and the examples of repairing the sandy soil, the moist soil and the red soil polluted by the phenanthrene according to the method for removing the polycyclic aromatic hydrocarbon in the soil by combining the electrokinetic remediation and the anodic oxidation.
Example 1:
in the method for removing the polycyclic aromatic hydrocarbon in the soil by combining the electrokinetic remediation and the anodic oxidation, the discharge plasma sintering technology is adoptedPreparation of Ti capable of in-situ generating hydroxyl4O7The electrode as anode and graphite as cathode were placed in a 200mL electrolytic cell to measure the hydroxyl yield with the current set at 100mA, and the results in FIG. 2 show that Ti4O7Compared with a Ti electrode, the electrode has higher oxygen evolution potential and is more beneficial to decomposing water to generate hydroxyl radicals; FIG. 3 shows Ti4O7The hydroxyl generation rates of the electrodes under current densities of 2.55, 5.10 and 10.20mA cm & lt-2 & gt are respectively 4.65 x 10 & lt-7 & gt 7M h & lt-1 & gt, 9.31 x 10 & lt-7 & gt 7M h & lt-1 & gt and 19.03 x 10 & lt-7 & gt 7M h & lt-1 & gt which are higher than those of the Ti electrode of a control group, the high-concentration hydroxyl generation is more favorable for in-situ degradation of pollutants at the anode, and the mechanism for generating the hydroxyl is direct oxidation of water at the anode.
Example 2:
the method for removing the polycyclic aromatic hydrocarbon in the soil by using the electric restoration and anodic oxidation combined method comprises the steps of restoring the phenanthrene-polluted sandy soil by using the device for restoring the phenanthrene-polluted sandy soil shown in figure 4, wherein a cathode pool is divided into solution pools in areas C1 and C2 by a cation exchange membrane CEM, a, C1 and C2 are respectively liquid pools corresponding to electrode chambers, the solution in the area A is connected with the liquid pool a through a peristaltic pump, the solutions in areas C1 and C2 are connected with the liquid pools C1 and C2 through the peristaltic pumps, 600g of the phenanthrene-polluted sandy soil with the phenanthrene content of 50mg/kg is filled into a soil chamber, and the soil chamber is averagely divided into four parts from an anode to a cathode, namely S1-S4. Anode is Ti4O7The anode of the comparison group is Ti, the cathode is ordinary power graphite, and a direct current power supply is connected with the electrodes to form a circuit loop. 0.05mol/L Na is used before the experiment is started2SO4The sandy soil is balanced for 2h, 1% by mass of triton X-100 is added into a cathode chamber C2, a power supply is connected to start repairing, the voltage is set to be 15V, bipolar electrolyte is extracted every 12 hours, the concentration of phenanthrene in the solution is measured, the concentration of phenanthrene in the sandy soil is measured after the experiment is finished, the experiment result shows that the cathode introduces a cation exchange membrane to adjust the electroosmotic flow of the sandy soil to flow to the anode, and the phenanthrene is extracted by the triton X-100 and moves to the anode along with the electroosmotic flow. FIG. 5 is a graph showing the comparison of phenanthrene concentration eluted from sandy soil, and it can be seen that the phenanthrene concentration of the Ti anode of the control group is always increased, while the Ti anode of the control group4O7The anode group basically has no dissolution of phenanthrene, which indicates that phenanthrene can be dissolved in Ti4O7Surface in-situ reduction of anodeAnd (5) solving. FIG. 6 is a schematic view of the remediation efficiency of phenanthrene-contaminated sandy soil, Ti4O7The removal rate of phenanthrene by the anode-mediated electrokinetic oxidation technology is as high as 97.06%.
Example 3:
the method for removing the polycyclic aromatic hydrocarbon in the soil by applying the electric restoration and anodic oxidation combination comprises the steps of adopting a device for restoring the phenanthrene-polluted moisture soil shown in figure 7 to restore the phenanthrene-polluted moisture soil, wherein an anode pool is divided into solution pools A1 and A2 by a cation exchange membrane CEM, a1, b and C are respectively solution pools corresponding to electrode chambers, the solution in the A1 area is connected with the solution pool a and a cathode chamber C through a peristaltic pump, the solution in the A2 area is connected with the solution pool b through the peristaltic pump, 600g of phenanthrene-polluted moisture soil with the phenanthrene content of 50mg/kg is filled into the soil chamber, the soil chamber is averagely divided into four parts from the anode to the cathode, namely S1-S4, and the anode is Ti4O7The anode of the comparison group is Ti, the cathode is graphite, and the direct current power supply is connected with the electrodes to form a circuit loop. 0.05mol/L Na was used before the start of the experiment2SO4The moisture soil is balanced for 2h, triton X-100 with the mass fraction of 1% is added into an anode chamber A2, a power supply is connected to start repairing, the voltage is set to be 15V, bipolar electrolyte is extracted every 12 hours, the concentration of phenanthrene in the solution is measured, and the concentration of phenanthrene in the moisture soil is measured after the experiment is finished. The experimental results show that phenanthrene in the moisture soil can be transported to the vicinity of the anode after the phenanthrene is extracted by the triton X-100 and moves to the cathode along with the electroosmotic flow and the cathode chamber and the anode A1 chamber are mixed. FIG. 8 is a graph showing the phenanthrene concentration eluted from the anode chamber as a function of the repair time, and it can be clearly seen that the phenanthrene concentration of the Ti anode of the control group is always increased while the Ti anode of the control group4O7The anode set has no substantial dissolution of phenanthrene, which indicates that phenanthrene can be dissolved in Ti4O7And degrading the surface of the anode in situ. FIG. 9 is the repair rate of phenanthrene-contaminated moisture soil, Ti4O7The repairing rate of phenanthrene by the anode-mediated electrokinetic oxidation technology reaches 88.22 percent.
Example 4:
the method for removing the polycyclic aromatic hydrocarbon in the soil by combining the electric restoration and the anodic oxidation adopts the device for restoring the red soil polluted by the phenanthrene as shown in figure 10, wherein in the figure 10, A and C are an anode chamber and a cathode chamber, and a and C are corresponding electricityThe solution in the area A is connected with the solution storage tank a through a peristaltic pump, the solution in the area C is connected with the solution storage tank C through a peristaltic pump, the solution D is a pH automatic controller which can automatically adjust the pH of a cathode chamber to 3.5-4.0, 600g of phenanthrene-polluted red loam with the phenanthrene content of 50mg/kg is filled into a soil chamber, the soil chamber is averagely divided into four parts from an anode to a cathode, namely S1-S4, and the anode is Ti4O7The anode of the control group is Ti, the cathode is graphite, a direct current power supply is connected with the electrodes to form a circuit loop, and 0.05mol/L Na is used before the experiment is started2SO4Balancing red soil for 2h, adding 1% by mass of triton X-100 into a cathode chamber C, connecting a power supply to start repairing, setting the voltage to be 15V, extracting two-pole electrolyte every 12 hours, determining the concentration of phenanthrene in the solution, determining the concentration of phenanthrene in the red soil after the experiment is finished, adjusting the pH by a cathode to adjust the electroosmotic flow of the red soil to an anode, extracting the phenanthrene by the triton X-100 and moving along with the electroosmotic flow to the anode, and taking a graph of the change of the concentration of the phenanthrene in the anode chamber eluting along with the repairing time as a graph in fig. 84O7The anode group has no dissolution of phenanthrene, which indicates that phenanthrene can be dissolved in Ti4O7And degrading the surface of the anode in situ. FIG. 11a shows the concentration of phenanthrene eluted from red soil, FIG. 11b shows the restoration rate of phenanthrene-contaminated sandy soil, and FIG. 11b shows Ti4O7The removal rate of phenanthrene by the anode-mediated electrokinetic oxidation technology reaches 81.87%.
The present invention is not limited to the above-described embodiments, which are described in the specification and illustrated only for illustrating the principle of the present invention, but various changes and modifications may be made within the scope of the present invention as claimed without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. A method for removing polycyclic aromatic hydrocarbons in soil by combining electrokinetic remediation and anodic oxidation is characterized by comprising the following steps:
step 1, preparing Ti capable of generating hydroxyl in situ by spark plasma sintering technology4O7Electrode preparation of Ti4O7An electrode;
step 2, arranging an electric repairing device;
step 3, transferring the polluted soil to an electric restoration device;
step 4, inserting a cathode/anode electrode pair into electrode chambers at two ends of the polluted soil;
and 5, introducing a direct current electric field to the electrode chambers at the two ends of the polluted soil, and finishing the restoration.
2. The method for removing polycyclic aromatic hydrocarbons in soil by combining electrokinetic remediation and anodic oxidation as claimed in claim 1, wherein the step 1 is to prepare Ti capable of generating hydroxyl in situ by spark plasma sintering technology4O7Electrode preparation of Ti4O7An electrode comprising the steps of:
step 1.1, 2g of Ti4O7The powder is filled in a graphite die, and an instrument vacuum device is started to ensure that the pressure is less than 1 MPa;
step 1.2, sintering Ti4O7A powder, wherein: heating the graphite mold to 600 ℃ within 1-5 minutes; within 5-13 minutes, the temperature is raised to 600-1000 ℃; the temperature is raised to 1000-100 ℃ within 13-17 minutes; maintaining the temperature at 1100 ℃ for 17-37 minutes; cooling to below 60 ℃ within 37-75 minutes;
step 1.3, Ti obtained in step 1.24O7And cleaning the electrode with water and ethanol, and drying for later use.
3. The method for removing polycyclic aromatic hydrocarbons in soil by combining electrokinetic remediation and anodic oxidation as claimed in claim 1, wherein the step 2 of providing an electrokinetic remediation device comprises the following steps:
step 2.1, arranging an anode chamber A and a cathode chamber C at the left end and the right end for containing electrolyte and inserting electrodes, wherein the capacity of an electrode chamber is 0.8L (8cm multiplied by 10 cm);
step 2.2, the anode chamber A and the cathode chamber C are respectively connected with a liquid storage tank a and a liquid storage tank C with the capacity of 1L (10cm multiplied by 10cm) and used for collecting excessive electrolyte;
step 2.3, arranging a soil chamber between the anode chamber A and the cathode chamber C, and averagely dividing the soil chamber from the anode to the cathode into: s1, S2, S3 and S4;
and 2.4, setting the soil repairing capacity of the soil chamber to reach 1.6L, wherein the length, width and height of the soil chamber are respectively 10cm multiplied by 16cm multiplied by 10 cm.
4. The method for removing polycyclic aromatic hydrocarbons from soil by electrokinetic remediation and anodic oxidation in combination with the method as claimed in claim 1, wherein the step 3 of transferring the contaminated soil to an electrokinetic remediation device comprises the steps of:
step 3.1, 600g of contaminated soil is filled into a soil chamber S1-S4 of the electric restoration device and compacted, and the filling density is 1.3g/cm3；
3.2, inserting a cation exchange membrane in the middle of an anode chamber of the electric repairing device, and dividing the anode chamber A into two half-electrode chambers A1 and A2 which are equal;
step 3.3, adding a surfactant solution with the mass fraction of 1% into the A2 electrode chamber for dissolving phenanthrene in soil and moving to the cathode chamber C along with electroosmosis flow, wherein the surfactant is Tween 80 or Triton X-100;
step 3.4, connecting the liquid storage tank of the cathode chamber C with the liquid storage tank of the anode chamber A1, enabling phenanthrene flowing to the cathode chamber in the repairing process to flow to the anode chamber A1, and enabling the cation exchange membrane of the anode chamber to prevent phenanthrene from flowing to the A2 chamber and entering the soil again;
step 3.5, add 0.1M Na to anode chamber A1 and cathode chamber C2SO4As an electrolyte.
5. The method for removing polycyclic aromatic hydrocarbons from soil by electrokinetic remediation and anodic oxidation in combination as set forth in claim 1, wherein the contaminated soil in step 3 is moist soil.
6. The method for removing polycyclic aromatic hydrocarbons in soil through electrokinetic remediation and anodic oxidation in combination with the claim 1, wherein if the polluted soil in the step 3 is sandy soil, the step 3.2 is as follows: inserting a cation exchange membrane in the middle of the cathode chamber of the electric repairing device, and dividing the cathode chamber C into two half-electrode chambers C1 and C2 which are equal, wherein the HO-generated in the cathode chamber is inhibited from entering the soil; and step 3.3, adding a surfactant solution with the mass fraction of 1% into the cathode chamber C.
7. The method for removing polycyclic aromatic hydrocarbons in soil through electrokinetic remediation and anodic oxidation in combination with claim 1, wherein if the contaminated soil in the step 3 is red soil, the step 3.2 is: adding a pH automatic controller in a cathode chamber of the electric repairing device for regulating the pH of the cathode chamber to be within a range of 3.5-4.0; step 3.3 is: and adding a surfactant solution with the mass fraction of 1% into the cathode chamber C.
8. The method for removing polycyclic aromatic hydrocarbons in soil through electrokinetic remediation and anodic oxidation in combination as claimed in claim 1, wherein the inserted anode in step 4 is Ti4O7The electrode or Ti electrode, and the inserted cathode is a common power graphite electrode.
9. The method for removing polycyclic aromatic hydrocarbons in soil through electrokinetic remediation and anodic oxidation in combination with the claim 1, wherein the voltage of the direct current electric field applied between the cathode/anode electrode pair of the electrode chambers at both ends of the contaminated soil in the step 5 is 10 to 20V.
10. The method for removing polycyclic aromatic hydrocarbons in soil through electrokinetic remediation and anodic oxidation in combination with claim 1, wherein in the step 5, the power-on time between the cathode/anode electrode pair of the electrode chambers at two ends of the polluted soil is 240 hours.
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