CN112872019A - Device and method for repairing organic matter contaminated soil through electric reinforcement and chemical oxidation - Google Patents
Device and method for repairing organic matter contaminated soil through electric reinforcement and chemical oxidation Download PDFInfo
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- CN112872019A CN112872019A CN202110054047.6A CN202110054047A CN112872019A CN 112872019 A CN112872019 A CN 112872019A CN 202110054047 A CN202110054047 A CN 202110054047A CN 112872019 A CN112872019 A CN 112872019A
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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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention discloses an electric strengthening synergistic chemical oxidation restoration device for organic matter contaminated soil, which comprises an injection well, wherein the injection well is distributed in an organic matter contaminated soil area, the wall of the injection well is provided with sieve pores, a medicament injection pipeline is distributed in the injection well and is connected with a medicament injection system, a cathode and an anode are respectively distributed at two sides of the organic matter contaminated soil area and are respectively connected with a power supply system. The invention also discloses an electric strengthening synergistic chemical oxidation remediation method for the organic matter contaminated soil, which utilizes the electrodynamics to convey an oxidizing agent and activates an oxidizing agent through an electrode effect and a chemical activating agent. The method can effectively improve the removal efficiency of the in-situ chemical oxidation process on the organic matters, and realize the efficient oxidative degradation of the organic pollutants in the site-polluted soil.
Description
Technical Field
The invention belongs to the field of polluted site remediation, and particularly relates to an electric strengthening synergistic chemical oxidation remediation device for organic matter polluted soil and an electric strengthening synergistic chemical oxidation remediation method for organic matter polluted soil.
Background
At present, the soil remediation field in China is in a rapid development stage, and the industrial site polluted by organic matters accounts for a large proportion. Aiming at the soil polluted by organic matters, the process adopted is in-situ chemical oxidation, and the process is used for oxidizing the organic matters by adding an oxidizing agent so as to reduce the pollutants.
The in-situ chemical oxidation technology is a common disposal technology recommended in the American super fund and is widely applied to treatment engineering of foreign organic pollution sites. The method is commonly used for repairing soil and underground water polluted by oil, organic solvent, polychlorinated biphenyl, non-aqueous phase chloride (such as trichloroethylene) and other pollutants, and can be used independently or combined with other repairing technologies. The in-situ chemical oxidation technology forms a relatively perfect technical system abroad and has wide application. The technology is developed rapidly in China, and is applied to some engineering projects after 2011, and the application is more and more extensive.
According to the current engineering experience and practical cases, the in-situ chemical oxidation technology has poor effect, and particularly for clay with low permeability, the clay cannot reach the standard after being repaired by multiple injections. The main reasons are that the oxidation medicament has high diffusion difficulty in soil and is difficult to effectively contact with pollutants, so that the repair effect cannot be expected.
Disclosure of Invention
The invention aims to provide an electric strengthening synergistic chemical oxidation repair device for organic matter contaminated soil and an electric strengthening synergistic chemical oxidation repair method for organic matter contaminated soil, which solve the problems of difficult delivery of an oxidant in soil and low efficiency of removing organic pollutants by oxidation in-situ oxidation repair,
the above object of the present invention is achieved by the following technical solutions:
electronic intensive collaborative chemical oxidation prosthetic devices of organic matter contaminated soil, including the injection well, the injection well is laid in organic matter contaminated soil district, and the sieve mesh has been seted up to the wall of a well of injection well, has laid the medicament injection pipeline in the injection well, and the medicament injection pipeline is connected with medicament injection system, and organic matter contaminated soil district both sides are laid cathode and positive pole respectively, and cathode and positive pole are connected with electrical power generating system respectively.
The organic matter contaminated soil area is characterized in that the number of the cathodes is multiple, the cathodes are sequentially and vertically arranged on one side of the organic matter contaminated soil area, the number of the anodes are multiple, the anodes are sequentially and vertically arranged on the other side of the organic matter contaminated soil area, and the arrangement depth of the cathodes and the anodes is larger than that of the organic matter contaminated soil area.
The cathode and the anode are both arranged in the electrode well pipe, the electrode well pipe is arranged in the electrode well, and the electrode well pipe is provided with a transverse slit.
The cathode is a carbon steel pipe, and the anode is a plate electrode with an iridium-tantalum coating or a platinum coating plated on the surface.
The corresponding anode, the injection well and the cathode are arranged in the same row to form an injection unit, the pH probe and the oxidation-reduction potential probe of the multi-parameter monitor are arranged between the anode and the cathode of each injection unit, and the multi-parameter monitor is also used for monitoring the current and the voltage between the anode and the cathode of each injection unit.
The electric strengthening synergistic chemical oxidation remediation method for the organic matter contaminated soil comprises the following steps:
step 1, arranging an injection well in an organic matter contaminated soil area, and respectively arranging a cathode and an anode at two sides of the organic matter contaminated soil area;
and 3, waiting for a set time after injecting the mixed medicament, starting a power supply system, continuously supplying power to the cathode (4) and the anode by the power supply system, and distributing a multi-parameter monitor.
The oxidant is sodium persulfate solution with the mass concentration of 20-40%; the activating agent is sodium hydroxide solution with the mass concentration of 10-30%.
The multi-parameter monitor as described above monitors the current and voltage between the anode and cathode of each injection unit,
when the current between the anode and the cathode of the injection unit is lower than 10A, firstly, the voltage between the anode and the cathode of the injection unit is increased through a power supply system until the current between the anode and the cathode reaches 10A, and the voltage between the anode and the cathode of the injection unit is smaller than a set warning voltage;
when the voltage between the anode and the cathode of the injection unit is increased to be more than or equal to the set warning voltage, and the current between the anode and the cathode is still lower than 10A, the medicament injection system is started to supplement the control liquid to the injection well corresponding to the injection unit, the conductivity is improved, and the control liquid supplementation is stopped until the current between the anode and the cathode of the injection unit is more than 10A.
The multiparameter monitor described above monitors the pH between the anode and cathode of each injection unit,
and when the pH value is lower than 12, starting the medicament injection system to supplement the sodium hydroxide solution to the corresponding injection well, and automatically stopping supplementing the sodium hydroxide solution after the pH value is higher than 12.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the present invention utilizes electrokinetics for delivery of oxidizing agents and activation of oxidizing agents by electrode effects and chemical activation agents. The invention can effectively promote the transmission of the oxidizing agent in the polluted soil, improve the removal efficiency of the in-situ chemical oxidation process on organic matters, and realize the efficient oxidative degradation of organic pollutants in the site polluted soil.
Drawings
FIG. 1 is a schematic top plan view of the present invention;
FIG. 2 is a schematic side view of the present invention.
Wherein: 1-a power supply system; 2-anode wire; 3-a cathode wire; 4-a cathode; 5-an anode; 6-a medicament injection system; 7-agent injection line; 8-an injection well; 9-a multi-parameter monitor; 10-organic matter contaminated soil area.
Detailed description of the invention
The present invention will be described in further detail with reference to examples for the purpose of facilitating understanding and practice of the invention by those of ordinary skill in the art, and it is to be understood that the present invention has been described in the illustrative embodiments and is not to be construed as limited thereto.
Example 1
The technical scheme of the invention is explained by taking the persulfate activated by the sodium hydroxide to repair the soil polluted by certain petroleum hydrocarbon as an example.
The electric strengthening synergistic chemical oxidation repairing device for organic contaminated soil includes power supply/electrode part and medicine injection part.
The power/electrode part comprises a power system 1, an anode wire 2, a cathode wire 3, a cathode 4 and an anode 5.
The medicament injection part comprises a dispensing unit, a medicament injection system 6, a medicament injection pipeline 7 and an injection well 8.
The negative pole 4 is many, and sets up perpendicularly in proper order in organic matter contaminated soil district one side, positive pole 5 be many, and set up perpendicularly in proper order in organic matter contaminated soil district opposite side, negative pole 4 and positive pole 5 lay the degree of depth and be greater than the degree of depth in organic matter contaminated soil district. The cathode 4 and the anode 5 are both arranged in an electrode well pipe, the electrode well pipe is arranged in the electrode well, and a transverse slit is formed in the electrode well pipe. The cathode 4 can be a carbon steel tube, and the anode 5 can be a plate electrode coated with iridium-tantalum coating or platinum coating on the surface.
The corresponding anode 5, the injection well 8 and the cathode 4 are arranged in the same row to form an injection unit, a pH probe and an oxidation-reduction potential probe of the multi-parameter monitor 9 are arranged between the anode 5 and the cathode 4 of each injection unit, and the multi-parameter monitor 9 is also used for monitoring the current and the voltage between the anode 5 and the cathode 4 of each injection unit.
And the multi-parameter monitor is used for monitoring various operating parameters and indexes in real time.
(1) Power supply/electrode part, comprising power supply system 1, anode wire 2, cathode wire 3, cathode 4 and anode 5:
and cathodes 4 and anodes 5 are respectively arranged on two sides of the organic matter polluted soil area, the cathodes 4 are connected with the power supply system 1 through cathode wires 3, and the anodes 5 are connected with the power supply system 1 through anode wires 2. The negative pole 4 is many, and sets up perpendicularly in proper order in organic matter contaminated soil district one side, and positive pole 5 is many, and sets up perpendicularly in proper order in organic matter contaminated soil district opposite side.
The power supply system 1 is a dc power supply, and can adjust the voltage and current as required.
According to the restoration depth of the organic matter contaminated soil area, the arrangement depth of the cathode 4 and the anode 5 is greater than the depth of the organic matter contaminated soil area, so that the restoration effect of pollutants is ensured.
The arrangement distance between the cathode 4 and the anode 5 can be determined by experiments according to the concentration of pollutants, the permeability coefficient of soil and the condition of soil layers. The cathode 4 and the anode 5 are made of stable materials and have the characteristics of corrosion resistance and oxidation resistance.
(2) And the medicament injection part comprises a dispensing unit, a medicament injection system 6, a medicament injection pipeline 7 and an injection well 8.
The injection well 8 is laid in organic matter contaminated soil district, and the wall of a well of injection well 8 has seted up sieve mesh or slot, has laid medicament injection pipeline 7 in the injection well 8, and medicament injection pipeline 7 is connected with medicament injection system 6.
The dispensing unit, i.e., the portion where the oxidizing agent and the activating agent are disposed, should be disposed in the field to ensure the activity of the agent without failure. In addition to the oxidizing agent, it is generally necessary to simultaneously prepare an activating agent for activation. The oxidizing agent and the activating agent are mixed according to a certain proportion.
The prepared mixed medicament is injected into the injection well 8 through the medicament injection system 6 at a specified flow rate and pressure. The injection well 8 is generally a vertical injection well, the depth of the injection well 8 is larger than or equal to the restoration depth of the organic matter contaminated soil area, sieve pores are formed in the depth range of the contaminants in the organic matter contaminated soil area of the injection well 8, and the mixed medicament is injected into the contaminated soil through the sieve pores. The injection well 8 can be made of pressure-bearing and corrosion-resistant PVC materials, the pipe diameter is generally 75mm to 150mm, and the sieve holes can be drilled holes or slots.
The agent injection system 6 is generally a pneumatic diaphragm pump, compressed air is used as a power source, mixed agents are injected into the injection well 8 through a pressure-resistant pipeline, and the injection pressure is adjustable between 0.1Mpa and 1 Mpa.
The pressurized medium (mixed agent) injected into the injection well is injected into the organic contaminated soil to be restored through the sieve holes of the injection well 8.
Note: the mixed medicament injection can adopt high-pressure rotary jet injection besides an injection well.
The high-pressure rotary jet injection is characterized in that a rotary jet grouting pipe and a nozzle drill are arranged at a designed height by using a drilling machine, and a prepared mixed medicament is sprayed out from a nozzle at the edge of the grouting pipe at a high speed after the mixed medicament obtains huge energy through a high-pressure generating device to form a liquid flow with highly concentrated energy so as to directly damage a soil body. In the spraying process, the drill rod rotates and lifts at the same time, so that the mixed medicament is fully mixed with the soil body. When the high-pressure rotary spraying mixed agent is used for repairing, except for a column where the mixed agent reaches during rotary spraying, the mixed agent can react with a polluted area in a wider range, can permeate along with cracks of a broken soil body, and is suitable for powdery clay with poor permeability.
After the mixed chemical (typically a mixed solution of persulfate solution and sodium hydroxide solution) is connected to the injection well 8 through the chemical injection system 6, the power supply system 1 is started to form an electric field in the contaminated soil layer. The electric field has two main functions: one is to strengthen the activation, and the common persulfate has certain oxidizability but not strong oxidizability, so that hydroxyl radicals with stronger oxidation effect are generated after the activation, and the activation of the persulfate can be effectively strengthened through the electrode effect. The other function is to enhance the transmission and movement of the oxidation medicament in the soil layer, the medicament is difficult to migrate and limited in diffusion radius in the soil, particularly in the viscous soil with poor permeability, and the medicament is fully contacted with organic pollutants through electrochemical enhanced transmission, so that the degradation of organic matters is promoted, and the oxidation efficiency is improved.
Persulfate has the characteristics of good stability, water solubility, strong oxidizing property, reaction product friendliness and the like, and is widely used. The persulfate ion generated by the dissolution of sodium persulfate in water is a stable strong oxidizing agent. While persulfate activation (activation) produces free radical reactions of greater significance for the removal of organic contaminants. The persulfate can be decomposed to generate new active substance-sulfate free radical (SO)4 -·)，SO4 -·Has a lone pair of electrons, the oxidizing ability of which exceeds that of persulfate, and is close to hydroxyl free radical (. OH), sulfate free radical (SO)4 -·) Has a longer half-life (4s, 40 ℃), and can be more fully contacted with pollutants. Persulfate can generate OH after being activated, so that the persulfate can oxidize and treat substances which are difficult to degrade, such as polychlorinated biphenyl. Persulfates are usually present as ammonium, potassium and sodium salts, sodium persulfate being generally used.
In this example, petroleum hydrocarbon (C) in the organic-contaminated soil region10-C40) The average concentration is about 3700mg/kg, the pollution depth is 6m, mainly comprising silty clay, and the underground water burial depth is 1 m.
The electric strengthening synergistic chemical oxidation remediation method for the organic matter contaminated soil comprises the following steps:
the method comprises the following steps: firstly, the characteristics, concentration, distribution, soil layer condition, permeability coefficient and the like of organic pollutants in an organic matter polluted soil area are analyzed, the number of cathodes 4 is multiple, the cathodes are sequentially and vertically arranged on one side of the organic matter polluted soil area, the number of anodes 5 is multiple, the anodes are sequentially and vertically arranged on the other side of the organic matter polluted soil area, the arrangement depth of the cathodes 4 and the anodes 5 is 7m, the distance between the cathodes 4 and the anodes 5 is 16m, the arrangement depth of the injection wells 8 is 7m, and the cathodes 4 and the anodes 5 are arranged.
Step two: firstly, a sodium persulfate solution with the mass concentration of 20% -40% is configured in a dispensing unit as an oxidizing medicament, a sodium hydroxide solution with the mass concentration of 10% -30% is configured in the dispensing unit as an activating medicament, the configured sodium persulfate solution and the configured sodium hydroxide solution are mixed according to the solute net mass ratio of about 5:2, and the mixed medicament is injected into an injection well 8 through a medicament injection system 6 and a medicament injection pipeline 7 in time after mixing. The mixed agent injected under pressure permeates into the contaminated soil through the sieve holes on the injection well 8.
Step three: after the mixed medicament is injected, the medicament injection system 6 is stopped, and the mixed medicament is allowed to automatically diffuse for about 2 days. The power supply system 1 is then turned on and power is continuously supplied to the cathode 4 and the anode 5 through the cathode wire 3 and the anode wire 2. During the power supply, parameters such as pH, current, voltage, oxidation-reduction potential and the like are measured by a multi-parameter monitor 9 arranged in the contaminated soil in the organic matter contaminated soil area. The power supply power and voltage of the power supply system 1 are adjusted as necessary.
Step four: and after reaction time of every two weeks, collecting soil samples of the organic matter-polluted soil area in a layered manner, measuring the concentration and the operation parameters of pollutants, and observing the degradation condition of the organic matters and the diffusion condition of the mixed medicament. The result shows that the average degradation of the petroleum hydrocarbon can reach more than 85 percent after 30 days, and the degradation part of the concentration is more uniform, thereby meeting the requirement of a repair target value.
Compared with the traditional sodium persulfate in-situ chemical oxidation repair effect, the repair effect is integrally improved.
The invention utilizes the electrode effect activation of persulfate. For most organic pollutants, the persulfate has poor oxidation effect, and can reach good oxidation effect after being activated, so that most organic matters difficult to degrade can be degraded. The persulfate activation method comprises light, heat, transition metal ions, alkali, inorganic anions and activated carbon activation, and is most widely used in soil remediation as alkali activation.
Electrode well and electrode: and (3) drilling the electrode well according to the electrode position design drawing (the depth of the electrode well is only slightly larger than the pollution depth, the diameter is about 120mm, and the diameter is slightly larger than the diameter of the electrode well pipe), and installing the electrode well pipe to prevent the electrode well from collapsing.
The electrode well pipe is provided with a transverse slit which is beneficial to the flow and exchange of the solution inside and outside the electrode well pipe. The electrode well pipe is made of PVC materials, the diameter of the electrode well pipe is 110mm, the length of the transverse slit is 0.5-1 mm, and the length of the electrode well pipe is slightly larger than the pollution depth.
The cathode 4 is made of corrosion-resistant materials such as carbon steel tubes, the outer diameter of the cathode 4 is 80mm, and the wall thickness of the cathode 4 is 2.0 mm. Each cathode 4 is formed by connecting a plurality of sub-cathodes with the length of 1.0m, adjacent sub-cathodes are connected by screws and nuts, and the length of the cathode 4 can be adjusted according to requirements.
The anode 5 is a plate-shaped electrode with an iridium tantalum coating or a platinum coating plated on the surface, the thickness of the iridium tantalum coating is 0.5mm, or the thickness of the platinum coating is 0.5mm, the length of the anode 5 is correspondingly consistent with the total length of the cathode, the width is 50-100 mm, and the thickness is 2-5 mm. The anode 5 can be a flat plate electrode, a porous flat plate electrode or a mesh electrode with an iridium-tantalum coating or a platinum coating plated on the surface. Compared with other electrodes, the iridium-plated tantalum coating has good acid and alkali corrosion resistance effect, and the special metal structure can promote the electrode effect to activate persulfate.
After the cables are connected to the cathode 4 and the anode 5, the cables are placed in the electrode well, and the positions of the cathode 4 and the anode 5 are arranged according to the designed positions.
The electrodes are arranged in rows, the corresponding anodes 5, injection wells 8 and cathodes 4 are sequentially arranged in the same row to form an injection unit, and the initial voltage of the anode 5 and the cathode 4 of each injection unit is set to be 100V. After the anode 5 and the cathode 4 are connected to a direct-current power supply, electric-oxidation combined repair is started, and the power is supplied for 18 hours and is cut off for 6 hours every day (the intermittent operation is beneficial to improving the repair efficiency).
The invention adopts a self-feedback mechanism, a pH probe and an oxidation-reduction potential probe of a multi-parameter monitor 9 are arranged between an anode 5 and a cathode 4 of each injection unit, the pH value and the oxidation-reduction potential value between the anode 5 and the cathode 4 of each injection unit are measured, and the multi-parameter monitor 9 is also used for monitoring the current and the voltage between the anode 5 and the cathode 4 of each injection unit.
When the pH value is lower than 12, the medicament injection system 6 is automatically started to supplement the sodium hydroxide solution to the corresponding injection well, and the sodium hydroxide solution is automatically stopped from being supplemented until the pH value is higher than 12.
The running current between the anode 5 and the cathode 4 of each injection unit is controlled to be more than 10A, when the current between the anode 5 and the cathode 4 of each injection unit is lower than 10A, the voltage between the anode 5 and the cathode 4 of each injection unit is firstly increased through the power supply system 1 until the current between the anode 5 and the cathode 4 reaches 10A, and the voltage between the anode 5 and the cathode 4 of each injection unit is smaller than the set warning voltage;
when the voltage between the anode 5 and the cathode 4 of the injection unit is increased to be more than or equal to the set warning voltage, and the current between the anode 5 and the cathode 4 is still lower than 10A, the medicament injection system 6 is started to supplement the control liquid to the injection well 8 corresponding to the injection unit, the conductivity is improved, and the control liquid supplementation is stopped until the current between the anode 5 and the cathode 4 of the injection unit is more than 10A.
The invention mainly aims at soil remediation of petroleum and polycyclic aromatic hydrocarbon contaminated sites. In the restoration, a special control liquid is added through an injection well, and the main functions of the control liquid are to improve the conductivity of the soil and the separation of pollutants from the soil. The control solution is generally prepared by mixing sodium chloride, cosolvent (surfactant, such as anionic sulfonate, Sodium Dodecyl Sulfate (SDS), sodium carboxymethyl cellulose (CMC), Sodium Dodecyl Benzene Sulfonate (SDBS), nonionic ethoxylated alcohol and the like) and water according to a certain proportion, wherein the sodium chloride comprises the following components in percentage by mass: 3-5 percent of cosolvent, 0.5-2 percent of cosolvent and 93-96.5 percent of water by mass percent, and experiments show that the sodium chloride can promote the migration of the cosolvent in the soil besides increasing the conductivity, and the specific proportion of the sodium chloride and the cosolvent is determined by the concentration of pollutants and site characteristic parameters after experiments.
It should be noted that the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. Electronic reinforcement of organic matter contaminated soil is in coordination with chemical oxidation prosthetic devices, including injection well (8), its characterized in that, injection well (8) are laid in organic matter contaminated soil district, the sieve mesh has been seted up to the wall of a well of injection well (8), lay in injection well (8) medicament injection line (7), medicament injection line (7) are connected with medicament injection system (6), negative pole (4) and positive pole (5) have been laid respectively to organic matter contaminated soil district both sides, negative pole (4) and positive pole (5) are connected with electrical power generating system (1) respectively.
2. The device for electrically reinforcing and synergistically repairing organic-polluted soil by chemical oxidation according to claim 1, wherein the number of the cathodes (4) is multiple, the cathodes are sequentially and vertically arranged on one side of the organic-polluted soil region, the number of the anodes (5) is multiple, the anodes are sequentially and vertically arranged on the other side of the organic-polluted soil region, and the arrangement depth of the cathodes (4) and the anodes (5) is greater than the depth of the organic-polluted soil region.
3. The device for electrically strengthening and synergistically repairing organic matter-contaminated soil according to claim 2, wherein the cathode (4) and the anode (5) are both arranged in an electrode well pipe, the electrode well pipe is arranged in the electrode well, and a transverse slit is formed in the electrode well pipe.
4. The device for electrokinetic strengthening synergistic chemical oxidation remediation of organic contaminated soil according to claim 3, wherein the cathode (4) is a carbon steel pipe, and the anode (5) is a plate electrode coated with an iridium-tantalum coating or a platinum coating on the surface.
5. The device for the electrokinetic strengthening synergistic chemical oxidation remediation of organic contaminated soil according to claim 4, wherein a corresponding anode (5), an injection well (8) and a corresponding cathode (4) are arranged in the same row to form an injection unit, the pH probe and the oxidation-reduction potential probe of the multi-parameter monitor (9) are arranged between the anode (5) and the cathode (4) of each injection unit, and the multi-parameter monitor (9) is further used for monitoring the current and voltage between the anode (5) and the cathode (4) of each injection unit.
6. The method for electrically reinforcing and chemical oxidizing and repairing organic-contaminated soil, which uses the apparatus for electrically reinforcing and chemical oxidizing and repairing organic-contaminated soil according to claim 5, is characterized by comprising the following steps:
step 1, arranging an injection well (8) in an organic matter contaminated soil area, and respectively arranging a cathode (4) and an anode (5) at two sides of the organic matter contaminated soil area;
step 2, preparing an oxidizing medicament and an activating medicament in a dispensing unit, mixing the oxidizing medicament and the activating medicament to obtain a mixed medicament, injecting the mixed medicament into an injection well (8) through a medicament injection system (6), and permeating the mixed medicament into an organic matter contaminated soil area through a sieve pore or a slit formed in a well wall of the injection well (8);
and 3, waiting for a set time after injecting the mixed medicament, starting the power supply system (1), continuously supplying power to the cathode (4) and the anode (5) by the power supply system (1), and arranging the multi-parameter monitor (9).
7. The method for electrokinetic-enhanced synergistic chemical oxidative remediation of organic-contaminated soil according to claim 6, wherein the oxidizing agent is sodium persulfate solution with a mass concentration of 20% to 40%; the activating agent is sodium hydroxide solution with the mass concentration of 10-30%.
8. The electro-kinetic strengthening synergistic chemical oxidation remediation method of organic contaminated soil according to claim 6, wherein the multi-parameter monitor (9) monitors the current and voltage between the anode (5) and the cathode (4) of each injection unit,
when the current between the anode (5) and the cathode (4) of the injection unit is lower than 10A, firstly, the voltage between the anode (5) and the cathode (4) of the injection unit is increased through the power supply system (1) until the current between the anode (5) and the cathode (4) reaches 10A, and the voltage between the anode (5) and the cathode (4) of the injection unit is smaller than the set warning voltage;
when the voltage between the anode (5) and the cathode (4) of the injection unit is increased to be more than or equal to the set warning voltage, and the current between the anode (5) and the cathode (4) is still lower than 10A, the medicament injection system (6) is started to supplement the control liquid to the injection well (8) corresponding to the injection unit, the conductivity is improved, and the control liquid supplementation is stopped until the current between the anode (5) and the cathode (4) of the injection unit is more than 10A.
9. The electro-kinetic enhanced synergistic chemical oxidation remediation method of organic contaminated soil according to claim 6, wherein the multi-parameter monitor (9) monitors the pH value between the anode (5) and the cathode (4) of each injection unit,
and when the pH value is lower than 12, starting the medicament injection system (6) to supplement the sodium hydroxide solution to the corresponding injection well, and automatically stopping supplementing the sodium hydroxide solution after the pH value is higher than 12.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114289488A (en) * | 2021-11-23 | 2022-04-08 | 生态环境部南京环境科学研究所 | Ferrous ion activation method for repairing organic contaminated soil |
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