Two-phase vacuum suction device with auxiliary chemical leaching and method for repairing soil thereof

Abstract

The invention belongs to the technical field of polluted soil in-situ repair, and particularly relates to a two-phase vacuum suction device with auxiliary chemical leaching and a method for repairing soil thereof. The device mainly comprises a leaching solution box, a booster pump, a leaching pipeline system, a vacuum suction pump, a gas-liquid separator, a liquid-phase processing unit, a gas-phase processing unit and an intelligent electric control system. The method comprises the following steps of: installing the leaching pipeline system on the surface of a polluted site, selecting a leaching agent as well as the dosage and the concentration of the leaching agent according to the pollution situation and the hydrogeological condition of the site, and washing pollutants into a leaching solution after the leaching is concluded; and then starting the vacuum suction pump, and sucking the leaching solution out of the surface by applying a vacuum and then further processing the leaching solution. The device and the method disclosed by the invention have the characteristics of being rapid, economic, efficient and the like, and have a good removal effect for organic matter pollution and heavy metals, wherein the removal rate can achieve 80-90%, the construction cost is saved by 45-65% compared with the traditional one, and the operation management expense is saved by about 25-35%.

Description

technical field [0001] The invention belongs to the technical field of in-situ remediation of polluted soil, and in particular relates to a chemical leaching assisted two-phase vacuum suction device and a soil remediation method thereof. Background technique [0002] In recent years, the ex-situ chemical remediation of soil has been widely concerned by scholars at home and abroad. A lot of manpower and material resources have been invested in the research of ex-situ chemical remediation, and good research results have been achieved in some aspects. At present, scholars mainly focus on the selection of chemical leaching agents and the dosage of chemical leaching agents, and at the same time explore the optimal dosage and rate of leaching agents for leaching effects under different conditions. [0003] In terms of leaching process parameters and influencing parameters, a lot of experimental research has been done in China, and good research results have been obtained. For exa...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the large amount of excavation work of chemical leaching, and at the same time overcome the problem of low efficiency of two-phase vacuum suction, to provide a chemical leaching auxiliary two-phase vacuum suction device and its method for repairing soil

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