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Department of Convergence Study on the Ocean Science and Technology, School of Ocean Science and Tech-nology, Department of Environmental Engineering, College of Engineering, Korea Maritime and Ocean UniversityIn this study, heavy metals are removed by soil washing from soils contaminated with Cu, Zn, and Pb, whosemaximum concentrations are up to 3350, 1220, and 2240 mg/kg, respectively. Through various soil washing experi-ments, the optimum conditions, including type and concentration of washing reagent, washing time, mixing ratio ofsoil and washing reagent, and stirring speed, are derived for effective removal of the heavy metals. It is found thatthe most effective washing reagent and its concentration are hydrochloric acid and 50 mM, respectively. The mostsuitable washing time is 30 minutes and the optimal mixing ratio of soil and washing reagent is 1:30 (g/mL). Theremoval efficiency, on the other hand, is not affected by stirring speed. The removal efficiencies of the heavy met-als decrease when washing reagent is reused. Furthermore, the heavy metals are readsorbed onto soil in case ofconsecutive reuse of washing reagent.

A Study on Removal of Heavy Metals (Cu, Zn, and Pb) from Contaminated Soil by Soil Washing