Abstract:
It is of great significance to timely grasp the information of concerned pollutants and reused land types after restoration in the process of contaminated site restoration for deepening the environmental management of construction land. In this study, 537 cases of contaminated sites in China were obtained through literature research and data query of the information disclosure platform, and the changes in remediation and reuse of contaminated sites in the past 10 years were analyzed. The statistical analysis results show that about 66% of the contaminated sites were concentrated in pioneering areas such as Beijing City, Shanghai City, Zhejiang Province, Jiangsu Province and Chongqing City. Since the promulgation and implementation of the Action Plan for Soil Pollution Prevention and Control in 2016, the number of contaminated sites has increased significantly. In 2018, the number reached a peak. Chemical industry, metal production, smelting and other industries accounted for a large proportion of the original land types. Heavy metals, benzene series mainly volatile organic compounds, polycyclic aromatic hydrocarbons based semi-volatile organic compounds and total petroleum hydrocarbons were typical pollutants in various industries. Before and after the implementation of
Soil Environmental Quality Construction Land Soil Pollution Risk Control Standards (Trial) (GB 36600-2018), the pollution occurrence frequency of benzene series, polycyclic aromatic hydrocarbons and total petroleum hydrocarbons increased obviously, while the occurrence frequency of organic pesticides and polychlorinated biphenyls (total) decreased. The redevelopment and utilization of contaminated sites are mostly residential land in sensitive land types, and the original industry types of such sites are chemical industry, metal products and other industries with more harmful pollutants. The results show that the promulgation and implementation of favorable policies and standards have promoted the remediation and control of contaminated sites in economically underdeveloped areas of China. Semi-volatile organic compounds, mainly polycyclic aromatic hydrocarbons (PAHs), will be the focus of soil remediation in the future. At the same time, the environmental sensitivity of redevelopment of contaminated sites still needs more attention.