In-situ electric heating desorption method for soil organic pollutants

Abstract

The invention discloses an in-situ electric heating desorption method for soil organic pollutants, and belongs to the technical field of organic matter polluted soil thermal desorption, the soil organic pollutant in-situ electric heating desorption method uses a high voltage power frequency heating technology, high voltage is applied to electrodes, and target soil between the electrodes is subjected to high voltage breakdown through electrode high voltage discharge, a plasma conductive channel is formed in the target soil layer, then high-voltage electricity is switched into power frequency electricity, the punctured soil and nearby soil are heated through resistance heat of the punctured soil layer, and therefore the heating desorption effect is achieved. According to the method, the electrochemical property of the soil is changed after the soil is broken down by high voltage, the resistance heat of the broken-down soil is used as a heating medium, and the electrochemical property of the target soil layer is changed, so that the conductivity of the soil is greatly improved, the energy conduction efficiency is accelerated, the soil remediation period is shortened, and the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of thermal desorption of organic polluted soil, and in particular relates to an in-situ electric heating desorption method of soil organic pollutants. Background technique [0002] In-situ thermal desorption technology has been applied to the remediation of contaminated land since the 1970s. Its principle is to increase the temperature of the polluted area by heating, change the physical and chemical properties of organic pollutants, and increase the concentration of organic pollutants in the gas or liquid phase. Improve the removal rate of pollutants by liquid phase extraction or soil gas phase extraction. According to different heating methods, in-situ thermal desorption technology is mainly divided into three types: resistance heating, heat conduction heating and steam heating. The length of the heating electrodes currently used in resistance heating is individually customized, and the cost is high. For ...

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Problems solved by technology

[0003] In view of the high cost of resistance rods in the existing resistance heating technology, and many problems such as transportation difficulties, inconvenient construction and installation, and non-recyclability, the purpose of the present invention is to provide an in-situ electric heating removal method for soil organic pollutants. The attached method uses high-voltage power frequency heating technology to apply high voltage to the electrodes, and conducts high-voltage breakdown of the target soil between the electrodes through high-voltage discharge of the electrodes, so that the target soil layer forms a plasma conductive channel, and then switches the high-voltage power to power frequency power. , through the resistance heat of the punctured soil layer itself, the punctured soil itself and the surrounding soil are heated, so as to achieve the effect of heating and desorption

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