Device and method for electrokinetic remediation of contaminated soil through combination of chelating agent and permeable reactive barrier

Abstract

The invention discloses a chelating agent and permeable reactive barrier combined electric contaminated soil remediation device and method.The device comprises a reaction bin and partition plates, the partition plates divide the reaction bin into an anode chamber, a soil sample chamber and a cathode chamber, an anode plate is arranged in the anode chamber, and a cathode plate is arranged in the cathode chamber; the device further comprises a permeable reactive barrier, an anolyte pH regulation and control unit and a catholyte circulating unit. An anode overflow hole is formed in the anode chamber, and a cathode overflow hole is formed in the cathode chamber; the anolyte pH regulation and control unit comprises a first peristaltic pump, an alkali liquor storage tank, an anolyte recovery tank, a pH controller and a pH sensor; and the catholyte circulating unit comprises a second peristaltic pump and a catholyte storage tank. According to the device, the chelating agent and the permeable reactive barrier can be effectively combined to electrically repair the heavy metal polluted soil body, the effect of the chelating agent can be fully played, meanwhile, heavy metal aggregation can be avoided, and the repair efficiency is higher.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a device and method for electrically repairing polluted soil in combination with a chelating agent and a osmotic reaction wall. Background technique [0002] Heavy metal pollutants in soil are very harmful and difficult to remove. At present, many heavy metal-contaminated soil remediation technologies have been developed, such as passivation, leaching, electrodynamic restoration, chemical fixation, plant methods, microbial methods, etc., among which electrodynamic restoration methods are due to It has become a research hotspot in recent years due to its high efficiency and environmental friendliness. The principle of electrokinetic remediation is to apply an external DC electric field in heavy metal-contaminated soil, so that the positively and negatively charged heavy metal ions in the soil move to the cathode and anode respectively, so as to achiev...

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Problems solved by technology

The principle of electrokinetic remediation is to apply an external DC electric field in heavy metal-contaminated soil, so that the positively and negatively charged heavy metal ions in the soil move to the cathode and anode respectively, so as to achieve the effect of removing heavy metal pollutants in the soil, but conventional electrokinetic restoration It is easy to generate precipitation near the cathode and cause soil pore blockage, resulting in poor removal of heavy metals in the soil. Therefore, the use of enhanced technology to improve the removal of heavy metals in polluted soil is one of the effective measures commonly used at present.

[0003] However, the current strengthening measures often inevitably bring about new problems, such as high cost or the accumulation of heavy metals in the soil. Providing a high-efficiency enhanced electric restoration equipment and process is the main solution to the current low efficiency of electric restoration. one of the ways

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