Field test on electro-osmosis in a heavy metal contaminated soil: Electrokinetic remediation and reinforcement of the soil

Abstract

With the acceleration of urbanization, less land is available for the direct construction of infrastructure. The reuse of landfills can provide resources in this respect; however, this approach requires the simultaneous removal of heavy metal ions and the strengthening of foundation. In this study, Ningbo's landfill was selected as a field test site. The concentrations of five heavy metal elements (Cu, Zn, Pb, Cd, Cr) gradually decrease with depth. Fulvic acid can complex with heavy metal salts to form a stable soluble conjugate, which greatly improves the electric repair effect. The removal rate of heavy metals after electrokinetic remediation is approximately 25%-35%. The heavy metal removal effect of the F2 test group was the best. The anode settlement of each group of experiments is approximately 12% larger than the cathode settlement.