Research Progress of Ex-situ Leaching and Remediation Technology for Heavy Metal Contaminated Soil

Currently, the heavy metal pollution of soil is severe in China and also other countries. There is a long way to go in soil remediation. Chemical leaching is a kind of remediation technology with remarkable effect and little pollution. Combining the soil pollution situation and research, this paper mainly reviewed the principle and process of the ex-situ leaching and remediation technology for heavy metal contaminated soil, as well as domestic and foreign applications of leaching technology. The research and application of leaching agents in China is relatively late, but the development is fast and the demand is urgent. In the future, more attention should be paid to the research and development of efficient and green leaching agents.