System and method for repairing organic contaminated site by coupling in-situ heat conduction with electroosmosis well point precipitation

Abstract

The invention discloses a system and method for repairing an organic contaminated site by coupling in-situ heat conduction with electroosmosis well point precipitation. A multiphase extraction well pipe in the system serves as a cathode of an electroosmosis well point precipitation unit at the same time, and a steel chisel driven into the ground serves as an anode of electroosmosis well point precipitation. According to the method, the groundwater level line is reduced to be below the polluted depth of a remediation area through the multiphase extraction unit, then the precipitation process isenhanced through the electroosmosis well point precipitation unit, the soil moisture content is further reduced, and energy consumption increased due to groundwater heating in the heat conduction process is reduced; and the remediation area is heated by means of in-situ heat conduction to volatilize organic pollutants and collecting the organic pollutants through the multiphase extraction unit. According to the method, the precipitation efficiency of the low-permeability contaminated soil is improved to the maximum extent, the energy utilization efficiency of the in-situ heat conduction technology is improved, the geological application range of the in-situ heat conduction technology is expanded, and the remediation period is shortened.

Description

technical field [0001] The invention belongs to the technical field of remediation of organic matter-contaminated soil and groundwater, and is suitable for in-situ remediation of organic matter-contaminated sites under geological conditions such as saturated cohesive soil, silt, and silt soil with a small permeability coefficient, and particularly relates to an in-situ heat conduction coupling electric A system and a method for remediating an organic polluted site by dewatering at a seepage well point. Background technique [0002] With the acceleration of industrialization and urbanization in our country, a large number of chemical and pesticide production enterprises began to move to industrial parks. Under the policies of "retreating from the city into the park" and "retreating from the second to the third", a large number of organically polluted sites with complex pollution conditions have been left behind, causing serious pollution to the soil and groundwater on the sit...

AI Technical Summary

Problems solved by technology

In the practical application of heat conduction technology, if the soil moisture content is high or the permeability is poor, since the repair process needs to heat and volatilize the water, this process will lead to a significant increase in energy consumption, which is not conducive to energy conservation and environmental protection requirements, and even greatly Increase the repair cost and may affect the repair effect

Patent CN202010032051.8 discloses an additional heat pipe for in-situ thermal desorption that can automatically collect and drain water. This technology enhances the drainage capacity of the in-situ thermal desorption system and can reduce energy consumption and cost. There are still some limitations in the application of strata

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