Theoretical Research and Immobilization Practice of Heavy Metal Polluted Soil in a Closed Lead-Zinc Smelter and Surrounding Farmland in Tongguan, Shaanxi

The goal of remediating polluted soil is to ensure safe reuse of the polluted soil by reducing the concentrations of pollutants in soil to the environmental standard limits. However, there is currently lack of evaluation on techniques and their performance of soil remediation,which has limited applications of the soil remediation in China. In this paper, we proposed technique selection standards and efficiency eval-uation criteria of soil remediation, based on the related regulations of soil pollution control, the ecological risks of pollutants, and the current situation of soil pollution, and then examined the performance of proposed soil remediation techniques in laboratory and in-situ polluted field in Tongguan. The results showed that both soil remediation techniques and their performance evaluation criteria were practicable. This re-search could provide some valuable information for restoration of polluted sites, remediation of polluted farmland soils and protection of agri-cultural product safety.