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Electrokinetic remediation method of heavy metal contaminated soil

A technology of polluted soil and electrodynamic remediation, applied in the environmental field, can solve the problems of accelerating the application of electrodynamic remediation method to polluted soil, and achieve good application value, high removal rate and easy operation

Inactive Publication Date: 2015-04-08
JIANGSU GAIYA ENVIRONMENTAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem to be solved: In order to accelerate the application of electric remediation methods in domestic polluted soils, a method for electric remediation of heavy metal-contaminated soils was invented

Method used

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  • Electrokinetic remediation method of heavy metal contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Prepare soil for simulating heavy metal pollution: prepare lead-containing heavy metal solution, add the heavy metal solution to commercial kaolin, stir evenly, and let it stand for later use;

[0024] (2) Self-made electric test device: It mainly includes 5 reaction tanks, which are in sequence: anode chamber, soil chamber, cathode chamber, soil chamber and anode chamber, in which the cathode / anode electrodes are graphite electrodes; the connection between the soil chamber and the electrode chamber Add filter paper in advance, and then use a 350-mesh filter to support the filter paper to prevent soil particles from polluting the electrode chamber; mix slag, iron slag and molecular sieves to prepare a permeable reaction wall PRB, and place it between the cathode chamber and the soil chamber; Inject the cathode and anode chamber working fluid: the cathodic working fluid is a citric acid aqueous solution containing hydrogen peroxide, and the anode working fluid is an a...

Embodiment 2

[0027] (1) Prepare soil for simulating heavy metal pollution: prepare two heavy metal solutions containing lead and cadmium, add the heavy metal solution to commercial kaolin, stir evenly, and let it stand for later use;

[0028] (2) Self-made electric test device: It mainly includes 5 reaction tanks, which are in sequence: anode chamber, soil chamber, cathode chamber, soil chamber and anode chamber, in which the cathode / anode electrodes are graphite electrodes; the connection between the soil chamber and the electrode chamber Add filter paper in advance, and then use a 350-mesh filter to support the filter paper to prevent soil particles from polluting the electrode chamber; mix slag, iron slag and molecular sieves to prepare a permeable reaction wall PRB, and place it between the cathode chamber and the soil chamber; Inject the cathode and anode chamber working fluid: the cathodic working fluid is an aqueous solution of oxalic acid containing manganese dioxide, and the anode ...

Embodiment 3

[0031] (1) Prepare soil for simulating heavy metal pollution: prepare three heavy metal solutions containing lead, cadmium and arsenic, add the heavy metal solution to commercial kaolin, stir evenly, and let it stand for later use;

[0032] (2) Self-made electric test device: It mainly includes 5 reaction tanks, which are in sequence: anode chamber, soil chamber, cathode chamber, soil chamber and anode chamber, in which the cathode / anode electrodes are graphite electrodes; the connection between the soil chamber and the electrode chamber Add filter paper in advance, and then use a 350-mesh filter to support the filter paper to prevent soil particles from polluting the electrode chamber; mix slag, iron slag and molecular sieves to prepare a permeable reaction wall PRB, and place it between the cathode chamber and the soil chamber; Inject the cathode and anode chamber working fluid: the cathodic working fluid is a phosphoric acid aqueous solution containing hydrogen peroxide, and...

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Abstract

The invention belongs to the field of soil remediation and discloses an electrokinetic remediation method of heavy metal contaminated soil. The electrokinetic remediation method of heavy metal contaminated soil comprises the following steps of: preparing simulated heavy metal contaminated soil for later use; making an electrokinetic test device; and filling the simulated heavy metal contaminated soil into the electrokinetic test device; performing electrokinetic tests; and taking the simulated heavy metal contaminated soil one week later, and analyzing and testing heavy metals in the simulated heavy metal contaminated soil. The electrokinetic test device mainly comprises the following 5 reaction tanks in sequence: an anode chamber 1, a soil chamber 1, a cathode chamber, a soil chamber 2 and an anode chamber 2 in sequence, wherein a molecular sieve containing PRB (permeable reactive barrier) is arranged between two of the reaction tanks. The electrokinetic test device further comprises cathode and anode electrodes, cathode and anode working fluids and a direct-current stabilized-voltage power supply, wherein the cathode and anode electrodes and the cathode and anode working fluids are filled in the cathode and anode chambers.

Description

technical field [0001] The invention belongs to the technical field of the environment, and relates to a restoration technology of polluted soil, in particular to a method for electric restoration of heavy metal polluted soil. Background technique [0002] With the development of my country's industrial and agricultural production, soil pollution accidents emerge in endlessly. For the treatment of contaminated soil, people have developed a variety of remediation technologies, such as chemical leaching repair, phytoremediation, microbial remediation, etc., and the newly developed "green" remediation technology ——Electric remediation, which is very suitable for the remediation of low-permeability soils, shows great application prospects. [0003] Electrokinetic remediation is a technology that has been applied to remediate contaminated soils since the late 1980s. Electric remediation technology is often referred to as soil electrochemical pollution control technology, electrod...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 程功弼詹晓倩
Owner JIANGSU GAIYA ENVIRONMENTAL SCI & TECH CO LTD
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