Remediation of Cd-Pb contaminated soil by coupled soil washing and electrochemical reduction
GAO Song1, TONG Xin-yuan2, WANG Yun1, WANG Zhuo-qun1, SUN Rui-lian1
1. Environmental Research Institute, Shandong University, Qingdao 266237, China; 2. School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
Abstract：This study proposed a combination technique to explore whether the coupling of chelating agent washing and electrochemical reduction can improve the heavy metal removal efficiency. The removal performance, mass transport mechanisms and economic benefits were investigated based on both a coupling strategy and separate soil washing. The combination technique could effectively improve the removal efficiency of heavy metals, and the synergistic enhancement effect was related to the chelating ability and regeneration ability of the chelating agent. The aminopolycarboxylic acids could increased the removal efficiency of Cd and Pb by 15.24% and 27.05%, respectively. The low-molecular-weight organic acids increased the removal efficiency of Cd and Pb by 5.31% and 10.24%, respectively. Aminopolycarboxylic acids were more suitable for the combination system. The most cost-effective treatment in 48h was coupled EDTA washing and electrochemical reduction, where 46.60% of Cd and 76.93% of Pb were removed from the soil.
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