Advances in remediation techniques for heavy metal pollution in soil

In recent years, with the rapid development of social economy, the problem of soil polluted by heavy metals is becoming more and more obvious.Soil pollution not only causes harm to the whole soil circle, but also has certain influence on other large circles, such as water pollution.Air pollution, etc.The pollution sources can be divided into natural and artificial sources.The heavy metal elements involved are mainly Hg、Cd、Pb、Cr、As、Zn、Cu、Ni and so on.How to effectively control soil heavy metal pollution is of great significance to the safety of agricultural products and the healthy development of human beings.In this paper, the sources of soil heavy metal pollution, the status quo of soil remediation research at home and abroad, and the research progress of soil heavy metal pollution remediation technology are described in this paper.At present, the main technologies used in soil heavy metal pollution remediation are physical remediation.Chemical remediation, bioremediation, agroecological remediation and combined remediation technology.The principles, applicable conditions, application examples and advantages and disadvantages of each remediation technique are described.Among them, bioremediation is the most commonly used method.Because of the superiority of other single remediation techniques, joint remediation can be regarded as the key development direction in the field of soil remediation in the future, in order to learn from the experience of the treatment of contaminated soil in China.