High-pressure splitting extrusion powder-mixing permeation-assisting in-situ remediation method for low-permeability polluted soil

Abstract

The invention relates to a high-pressure splitting extrusion powder-mixing permeation-assisting in-situ remediation method for low-permeability polluted soil. The remediation method comprises the following steps: confirming a to-be-remedied area of soil; setting one or more remediation grids according to the size of the to-be-remedied area of the soil; arranging liquid injection wells at the four top corners of the repairing square grids; arranging an extraction well in the center of the repair grid; and mounting aliquid injection device at the liquid injection well, and mounting a negative pressure extraction device at the extraction well for liquid injection and extraction. Water and gas are injected into the polluted soil body through high-pressure jet grouting under high pressure, the original structure of the polluted soil body is destroyed, and a mud cake-shaped structure is formed, so that plant ash and sand are injected to be evenly mixed into the polluted soil body, the grain composition of the soil body is changed, and the permeability coefficient of the soil body is increased; and the chemical agent permeation rate is increased, the reaction rate and the permeation range are increased, the remediation range is increased, the remediation period is greatly shortened, the chemical agent dosage, the permeation path and the permeation range can be controlled, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to an in-situ repair method for low-permeability polluted soil by high-pressure splitting and extrusion mixed with powder to aid infiltration. Background technique [0002] In recent years, with the acceleration of my country's industrialization process, my country's soil pollution has become increasingly serious, forming a large amount of polluted soil and groundwater, which not only destroys the ecological environment but also directly or indirectly endangers human health and safety. Therefore, the restoration of polluted soil and groundwater is imminent. [0003] The remediation of contaminated soil is divided into two operation methods: ex-situ remediation and in-situ remediation according to different disposal sites. Ex-situ remediation is to excavate or extract contaminated soil or groundwater from the original location where the site was polluted, and t...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to overcome the deficiencies in the prior art, and to provide a high-pressure splitting extrusion method for in-situ restoration of low-permeability polluted soil, which can solve the problem of low-permeability polluted soil in the prior art. It is difficult to inject the solution into the polluted soil, the scope of repairing the soil is small, and the repairing period is long.

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