Remediation method for soil contaminated by heavy metal

Abstract

The invention discloses a remediation method for soil contaminated by heavy metal. Heavy metal absorbents are applied to the contaminated soil, collecting gutters are constructed in the periphery of the soil contaminated by the heavy metal, acid elution solutions are sprayed on the surface of the soil contaminated by the heavy metal after heavy metal passivators are applied until the measured content of the heavy metal in the soil contaminated by the heavy metal does not change, the soil contaminated by the heavy metal is washed by clean water until the soil is neutral, and then conditioners and improvement agents for the soil contaminated by the heavy metal are applied. According to the remediation method, the collecting gutters are constructed in the periphery of the soil contaminated by the heavy metal, impermeable films are laid on the bottoms of the collecting gutters, and therefore the heavy metal in the soil contaminated by the heavy metal can be prevented from being leaked or diffused to the deeper part of the soil; one collecting tank can be shared by a plurality of pieces of soil contaminated by the heavy metal, and therefore the resources can be saved; calcium, magnesium, silicon, potassium, phosphorus, iron, manganese, zinc, boron and molybdenum lost from the soil can be supplemented by the improvement agents and the conditioners, and therefore the soil fertility can be improved.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a heavy metal soil remediation method. Background technique [0002] With the rapid development of industry and mining, as well as the abuse of sewage irrigation and sludge, irrational application of pesticides and fertilizers, incomplete combustion of fossil fuels and agricultural films and other reasons, heavy metal pollution has become increasingly serious, affecting the ecological environment and Human health poses a great threat. In addition, heavy metal pollution will also lead to soil degradation, crop failure, and may affect human life safety through the food chain. Therefore, the task of treatment and restoration of heavy metal-contaminated soil is very urgent. [0003] Soil heavy metal treatment and restoration methods include chemical treatment technology, plant absorption technology, etc. Chemical treatment technology is to add passivating agen...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a heavy metal soil remediation method, which aims to solve the problems of narrow application range, small processing capacity and low absorption capacity of existing soil heavy metal remediation methods

Images