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A Study of Influence Factors for Immobilizing Heavy Metals in Contaminated Soil  

Hwang, An-Na (Department of Civil, Environmental and Architectural Engineering, Korea University)
Na, Seung-Min (Department of Civil, Environmental and Architectural Engineering, Korea University)
Khim, Jee-Hyeong (Department of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of Soil and Groundwater Environment / v.12, no.4, 2007 , pp. 72-77 More about this Journal
Abstract
Soil contamination by heavy metals was environmental concern due to its effect on human. In this study, monopotassium phosphate $(KH_2PO_4)$ used as phosphate source to remediate the contaminated soil with heavy metals and factors such as reaction time, initial concentration and pH of phosphate solution, species of heavy metal (lead, cadmium, zinc) and particle size were controlled. Heavy metals were removed in the order Pb > Zn > Cd and the maximum effectiveness was achieved for Pb. The removal efficiency of lead was from 95% to 100% and occurred rapidly occurred during 10 minutes. Mechanism of lead immobilization is dissolution of phosphate and the forming of a new mineral with phosphate having extremely low solubility.
Keywords
Heavy metal; Monopotassium phosphate; Immobilization; Lead; New mineral;
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