Horizontal permeable reaction layer for soil remediation and soil remediating method

Abstract

The invention relates to a horizontal permeable reaction layer for soil remediation and a soil remediating method. A filler in a permeable reactive wall is a mixture of zero-valent iron powder and ferrous sulfate, the reaction of the zero-valent iron powder and the ferrous sulfate is as follows: Cr<6+>+Fe->Cr<3+>+Fe<3+>, Cr<6+>+Fe<2+>->Cr<3+>+Fe<3+>. The soil remediating method comprises the following steps: a) arranging filling holes around a chromium-polluted soil region; b) preparing the zero-valent iron powder and the ferrous sulfate into slurry with good liquidity, controlling the concentration of the slurry to be between 1% and 30%; c) dispersing the slurry within a preset depth range through the filling holes, filling between a soil gap and soil to jointly form a horizontal permeable reactive layer; d) completing punching and filling by holes, checking the forming condition of the permeable reactive layer by sampling inspection in the centers of the filling holes, wherein the sampling ratio is 5%; and e) after the sampling inspection reaches the standard, closing the sampling holes, and setting the permeable reactive wall. According to the soil remediating method, the filler in the permeable reactive wall is improved, the filling is performed by using a slurry manner, gaps among soil are preferably filled, and the reaction efficiency is improved.

Description

technical field [0001] The invention relates to a permeable reaction wall, in particular to a horizontal permeable reaction layer for soil restoration and a soil restoration method, and belongs to the field of environmental improvement engineering. Background technique [0002] The permeable reflection wall is an in-situ treatment system for blocking reactive materials. It places the reactive materials perpendicular to the flow direction of the groundwater pollution zone. When the pollution zone flows through the reaction wall, physical and chemical reactions occur with the reactive material It is degraded, adsorbed, precipitated or removed by the action, so that the pollution zone can be treated. [0003] In-situ soil treatment often adopts in-situ leaching and in-situ injection techniques. Soil leaching is the process of using fluid to wash away pollutants in the soil. In situ injection technology reacts with pollutants by injecting a reducing agent or solution at a speci...

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Problems solved by technology

However, this method emphasizes the treatment of acidic wastewater. Even if the structure of the biopermeable reaction wall is changed, it is also a solution to the problem of how to better treat acidic wastewater. However, the treatment of chromium pollution is not very good. solve

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