In-situ remediation method of heavy metal-organic combined pollution soil

Abstract

The invention relates to an in-situ remediation method of heavy metal-organic combined pollution soil. According to the method, a set of electrokinetic remediation device is added with a power switching system, an electrode heating technology is combined with the electrokinetic remediation and chemical oxidization technology, namely, the direct current power is utilized firstly, sodium persulfate used as the oxidizing agent is migrated to soil through electric process, meanwhile, migration and removal of heavy metal ion in the soil are realized. Then the alternating current power is switched, and soil is heated to a certain temperature through the electrode heating method so as to activate the sodium persulfate migrated to soil, and thereby realizing the in-situ degradation of organic pollutant in the soil. The method applies electrode to the electrode heating system and the electrokinetic remediation device at the same time, simplifies the remediation device and saves the system energy consumption while solves the difficulty that oxidant cannot migrate and activate in the soil and improves the remediation efficiency; the method is a combined soil remediation technology with prospect of application and promotion.

Description

technical field [0001] The present invention designs an in-situ remediation method for heavy metal-organic composite polluted soil, especially through the combination of electrode heating soil, electrokinetic repair and chemical oxidation, while using electrokinetic process to promote the migration of sodium persulfate into the soil, and realize the heavy metal in the soil Electrokinetic restoration of ions, and then using electrodes to heat the soil to activate the sodium persulfate migrating into the soil, so as to achieve efficient oxidation and degradation of organic pollutants in the soil, belongs to the field of soil restoration technology. Background technique [0002] With the implementation of the policy of "retreating from the second to the third" and "retreating from the city into the park", the large-scale relocation of industrial enterprises has led to a large number of leftover and abandoned industrial polluted sites in the city. These relocated sites have serio...

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Problems solved by technology

[0009] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the oxidant cannot migrate to the polluted area and the ratio of the oxidant and the activator cannot be adjusted in the existing in-situ chemical oxidation process. Mobility and activation of sodium persulfate and simultaneous electrokinetic process for heavy metal removal from soil

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