Method for removing organochlorine compounds in soil through cooperation of chelating agent enhanced advanced oxidation and electric remediation

Abstract

The invention belongs to the technical field of soil pollution remediation. The invention relates to a method for removing organochlorine compounds in soil through cooperation of chelating agent enhanced advanced oxidation and electric remediation. The method comprises the following steps: 1) transferring the contaminated soil to an electric remediation device, adding an oxidant and glutamic acidN, N-diacetic acid into the soil, and meanwhile, arranging nano zero-valent iron near an anode of the electric remediation device; and 2) adjusting the pH value of an electrolyte, and starting the electric remediation device to remove the organochlorine compounds in the soil, wherein the oxidant is at least one of persulfate, hydrogen peroxide, permanganate and hypochlorite. According to the method, the organochlorine pollutants in the soil are synergistically removed based on a combined treatment mode of electric remediation, the nanoscale zero-valent iron, the oxidant and the glutamic acid N, N-diacetic acid, the removal rate of the organochlorine pollutants in the soil can be greatly increased, and meanwhile in-situ removal of the organochlorine pollutants can be achieved.

Description

technical field [0001] The invention belongs to the technical field of soil pollution remediation, and in particular relates to an in-situ remediation method for soil polluted by organic chlorine compounds. Background technique [0002] Organochlorine compounds, a class of important refractory organic pollutants, have attracted widespread attention due to their high residual, high ecotoxicity, and strong bioresidue. Organochlorines are easily adsorbed on soil and rivers due to their strong fat solubility and strong hydrophobicity. on the sediment. Currently available degradation methods for organochlorine include air stripping, incineration, solidification / stabilization, biodegradation, chemical oxidation, chemical reduction, and chemical leaching. Although the air stripping method is convenient and fast, it is only suitable for volatile pollutants in organic chlorine. The incineration method is an original degradation method, but it may cause secondary pollution; the commo...

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Problems solved by technology

[0007] In view of the defect that the removal efficiency of organic chlorine pollutants in soil is not high in the prior art, the present invention provides a combined treatment method of glutamic acid N,N-diacetic acid + electrokinetic repair + nanometer zero-valent iron + oxidant to synergistically remove soil The organochlorine pollutants in the soil can achieve a substantial increase in the removal rate of organochlorine pollutants in the soil, and at the same time can achieve in-situ removal

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