A deep two-stage repair and recovery method for heavy metal soil

Abstract

The invention discloses a deep two-stage remediation and recovery method for heavy metal soil, which belongs to the technical field of soil remediation, a mode of pre-burying two sections of remediation rods in the heavy metal soil to be remediated can be realized; heavy metals are absorbed by taking water as a carrier from an area close to underground water from a deep soil layer; then, the separation of heavy metals and carrier water is completed in a heating evaporation form; heavy metals are intensively intercepted and collected for recovery; the water vapor rises to the area where the heavy metal enrichment plants are planted on the surface layer of the soil along the second-section remediation rod; root systems of the heavy metal enrichment plants directly absorb water, and meanwhileleakage and diffusion of heavy metal are avoided; physical, chemical and biological remediation modes are comprehensively adopted, two-stage in-situ remediation of the to-be-remediated heavy metal soil is achieved, the remediation effect on contaminated soil, especially deep soil, is remarkably improved, the remediation cost is low, and heavy metal can be recycled.

Description

technical field [0001] The invention relates to the technical field of soil remediation, and more specifically relates to a two-stage remediation and recovery method for heavy metal soil deep layers. Background technique [0002] Soil remediation is a technical measure to restore the normal function of polluted soil. In the soil remediation industry, there are more than one hundred existing soil remediation technologies, and there are more than ten commonly used technologies, which can be roughly divided into three methods: physical, chemical and biological. Since the 1980s, many countries in the world, especially developed countries, have formulated and carried out plans for the treatment and restoration of contaminated soil, thus forming a new soil restoration industry. [0003] Soil is one of the most basic material foundations for human survival, and it is also the final destination of various pollutants. 90% of the world's pollutants are eventually trapped in the soil....

AI Technical Summary

Problems solved by technology

The use of biological methods to treat heavy metal pollution in soil has low cost and will not cause secondary pollution. It can also restore the soil ecosystem while treating heavy metals. However, the efficiency of heavy metal treatment is low and the effect is poor, and it cannot be efficiently treated. Complete the treatment of soil heavy metal pollution

[0005] Especially for heavy metal remediation in the deep soil, there is no effective and low-cost remediation method, which leads to the general heavy metal soil remediation only for the surface soil, and it is difficult to penetrate deep into the area close to the groundwater. As the source of heavy metal pollution, even the heavy metals in the surface soil As time goes by, the pollution will still spread. Therefore, the current deep soil remediation problem is difficult to effectively and targetedly remediate on the one hand, and on the other hand, it is difficult to recover heavy metals to achieve resource recycling.

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