Method for repairing heavy metal pollution soil by using chemical leaching and deep layer fixing combining technology

Abstract

A method for repairing a heavy metal pollution soil by using a chemical leaching and deep layer fixed combining technology is characterized in that leaching the heavy metal pollution skin layer soil by a leaching agent, and the leached heavy metal is refastened by the soil processed by a fixation agent on the deep layer. By means of leaching the heavy metal pollution skin layer soil by the leaching agent with certain concentration, it is capable of reducing the skin layer soil heavy metal and the absorption of crops root system; the leached heavy metal is fixed on the deep layer, and the fixedheavy metal is not be leached again by a rain rarely, which avoids to pollute the groundwater, so as to repair and use safely the heavy metal pollution soil. The method for repairing the polluted soil has a high efficiency, is capable of controlling an environment risk of the groundwater nicely, and is a new and low cost repairing route for the heavy metal pollution soil.

Description

technical field [0001] The invention relates to a combined technology for remediating heavy metal-contaminated soil, in particular, using a mixed organic agent to wash the heavy metal-contaminated soil, and applying a passivating agent to the deep soil to fix the leached heavy metal. Background technique [0002] With the development of industrial and agricultural production, the problem of heavy metal pollution in the soil-plant-water system is becoming more and more serious. Zhou Shengxian, director of the State Environmental Protection Administration, said at a video conference on national soil pollution investigation and pollution prevention and control (July 18, 2006) that according to incomplete surveys, there are currently about 150 million mu of polluted arable land in China, and the country is polluted by heavy metals every year. The polluted grain amounted to 12 million tons, causing direct economic losses of more than 20 billion yuan. In my country, as many as 12...

AI Technical Summary

Problems solved by technology

In most cases, in-situ remediation can show its superiority in remediation efficiency and cost, but the problem faced by in-situ chemical leaching is the treatment of the leachate produced by soil leaching. Improper treatment of the leachate will cause groundwater Pollution

At present, the pump-out treatment (P&T) technology is often used in the international leachate, but the cost is high

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