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Electric diffusion-electric heating activation method for repairing organic contaminated soil

A technology of organic pollution and activation method, applied in the field of remediation of organic polluted soil, to achieve the effect of increasing ion diffusion speed, improving stability and safety, and improving uniformity

Active Publication Date: 2022-02-25
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few related studies and related patents on electrokinetic diffusion persulfate and electric heating coupled activation.

Method used

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  • Electric diffusion-electric heating activation method for repairing organic contaminated soil
  • Electric diffusion-electric heating activation method for repairing organic contaminated soil
  • Electric diffusion-electric heating activation method for repairing organic contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: a kind of electrokinetic diffusion-electric heating activation method for repairing organic polluted soil comprises the following steps:

[0027] S1. Soil pretreatment;

[0028] S1-1. Determine the boundary of the organic polluted soil area, remove the surface debris in the polluted soil area, and adjust the pH of the organic polluted soil to 4 by using HCl;

[0029]S1-2. Excavate the cathode tank at the center of the organic polluted soil area, excavate the anode tank at a distance of 0.5m from the boundary of the organic polluted soil area, and excavate multiple dosing wells between the cathode tank and the anode tank according to the triangle method, At the same time, multiple thermocouple heating rods are pre-buried, and the thermocouple heating rods and the dosing wells are arranged at intervals, and the distance between two adjacent dosing wells is 2m; the excavation depth of the cathode tank, anode tank and dosing well is greater than the organic po...

Embodiment 2

[0036] Embodiment 2: a kind of electrokinetic diffusion-electric heating activation method for repairing organic polluted soil comprises the following steps:

[0037] S1. Soil pretreatment;

[0038] S1-1. Determine the boundary of the organic polluted soil area, remove the surface debris in the polluted soil area, and use deionized water to adjust the moisture content of the organic polluted soil to 15wt%; by adjusting the moisture content of the organic polluted soil, the Na 2 S 2 o 8 The diffusion effect of the solution in organic polluted soil, while improving the safety of the whole system; use HCl to adjust the pH of the organic polluted soil to 5; evenly lay a clay layer with a thickness of 20cm on the surface of the polluted soil area, and compact it, and then in the clay A cement mortar layer with a thickness of 5cm is laid on the surface of the soil layer. By laying a clay layer and a cement mortar layer on the surface of the contaminated soil area, it can effective...

Embodiment 3

[0046] Embodiment 3: a kind of electrokinetic diffusion-electric heating activation method for repairing organic polluted soil comprises the following steps:

[0047] S1. Soil pretreatment;

[0048] S1-1. Determine the boundary of the organic polluted soil area, remove the surface debris in the polluted soil area, and adjust the pH of the organic polluted soil to 6 by using HCl;

[0049] S1-2. Excavate the cathode tank at the center of the organic polluted soil area, excavate the anode tank at a distance of 1.2m from the boundary of the organic polluted soil area, and excavate multiple dosing wells between the cathode tank and the anode tank according to the triangle method, At the same time, multiple thermocouple heating rods are pre-buried, and the thermocouple heating rods and the dosing wells are arranged at intervals, and the interval between two adjacent dosing wells is 5m; sand is used to fill the gap between the thermocouple heating rods and the organic polluted soil, ...

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Abstract

The invention discloses an electric diffusion-electric heating activation method for repairing organic contaminated soil. The method comprises the steps that S1, the boundary of an organic contaminated soil area is determined, impurities on the surface of the soil are removed, and the pH of the soil is adjusted; and a cathode tank, an anode tank and a dosing well are excavated, and a thermocouple heating bar is pre-buried; S2, a cathode bar is arranged in the cathode tank, an anode bar is arranged in the anode tank, and a Na2S2O8 solution is injected into the dosing well; and then an electric field is applied between the cathode bar and the anode bar to make the Na2S2O8 solution electrically diffused in the soil; and S3, the organic contaminated soil is heated through the thermocouple heating bar to make S2O8<2-> in the Na2S2O8 solution heated and activated, strong oxidizing free radicals are generated, and pollutants in the organic contaminated soil are degraded. The method is reasonable in design, capable of achieving in-situ remediation of the organic contaminated soil and suitable for large-scale popularization.

Description

technical field [0001] The invention relates to the technical field of organic polluted soil remediation, in particular to an electrokinetic diffusion-electric heating activation method for remediating organic polluted soil. Background technique [0002] In recent years, with the rapid development of my country's industrialization, the problem of soil pollution has become increasingly serious, which has become a major factor that threatens human health and affects environmental safety. Soil pollution will cause the pollutants in crops to exceed the standard, and be enriched into humans and animals through the food chain, endangering the health of humans and animals, and causing human cancer and other diseases. In addition, after the soil is polluted, the polluted topsoil with a high concentration of pollutants is easy to enter the atmosphere and water bodies under the action of wind and water respectively, resulting in air pollution, surface water and groundwater pollution, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/085
Inventor 刘国强张亚李旭伟王荐胡哲伟刘勇华牟婷婷
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA