RESEARCH PROGRESS ON REMEDIATION TECHNOLOGY OF CHRO-MIUM CONTAMINATED SOILS AND GROUNDWATER IN SHANGHAI

In the 1970s, a large volume of chrome-containing wastewater was discharged into ground in Shanghai. Hexavalent chromium has the characteristics of high toxicity, high solubility and strong mobility. It can easily contaminate groundwater system. Efficient and economic remediation methods are of great significance. This paper systematically summarizes the remediation status of hexavalent chromium. They include reduction and stabilization remediation, permeable reactive barrier, electrokinetic remediation and biological remediation. It is appropriate to take electrokinetic reactive barriers with strengthening reagent in low-permeability soil when deeper than 4m below ground surface.