Method for remedying heavy metal contaminated soil

Abstract

With the development of industry and agriculture, human activities, such as the metal excavation and smelting, electroplating, the emission of wastewater, waste gases and waste solids, the use of agricultural chemicals and the like, produce greater influence on the heavy metal distribution of soil to further cause a series of contamination problems. Heavy metal soil contamination destructs the physicochemical properties of the soil, hardens the soil, reduces the quality of agricultural products, and particularly damages animal health and human health because crops have an enrichment function on harmful heavy metals. The invention provides a method for remedying heavy metal contaminated soil. In the method, an environmentally-friendly natural high-molecular polymer is adopted to chelate the heavy metals absorbed into the soil, and plants are utilized to absorb and remove the heavy metals so as to fulfill the aim of remedying the soil, wherein the natural high-molecular polymer has vast sources and low cost, and is convenient to prepare or extract.

Description

technical field [0001] The invention relates to a method for remediating heavy metal polluted soil by using chitosan and plants, and belongs to the technical field of soil remediation. Background technique [0002] Heavy metals are a class of potentially harmful pollutants in the soil environment. With the development of industrial and agricultural production, human activities such as metal mining and smelting industry, electroplating industry, discharge of three wastes and use of agricultural chemicals have more and more influence on the distribution of heavy metals in soil, resulting in a series of pollution problems. [0003] Soil heavy metal pollution will cause damage to the normal functions of the soil, such as destroying the physical and chemical properties of the soil, causing soil compaction, and reducing the quality of agricultural products, especially through the enrichment of harmful heavy metals by crops. Heavy metals enter the food chain after being absorbed b...

AI Technical Summary

Problems solved by technology

In recent years, organic chelating agents such as ethylenediaminetriacetic acid (HEDTA) and ethylenediaminetetraacetic acid (EDTA) have been used for soil remediation, but these synthetic chemical reagents are highly toxic and easily cause secondary pollution