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Remediation of Soils Contaminated with Arsenic and heavy Metals by Soil Washing  

Ko Ilwon (Environment research center OIKOS Co. Ltd.)
Lee Cheol-Hyo (Environment research center OIKOS Co. Ltd.)
Lee Kwang-Pyo (Environment research center OIKOS Co. Ltd.)
Kim Kyoung-Woong (Arsenic Geoenvironment National Research Lab (NRL), Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST))
Publication Information
Journal of Soil and Groundwater Environment / v.9, no.4, 2004 , pp. 52-61 More about this Journal
Abstract
In order to remediate soils contaminated with oxyanionic As and cationic Zn and Ni through the pilot-scale acid washing, the effectiveness of acid washing and the properties of contaminated soils, fine soil particle and dissolved contaminants were evaluated. $H_{2}SO_4\;and\;H_{3}PO_4$ washing at pH $2{\sim}3$ enhanced the removal of As by the presence of competitive oxyanions and HCl washing effectively removed simultaneously As, Zn and Ni. The effectiveness of soil washing was little enhanced above the critical reaction time, and the carbonate, Fe/Mn oxide and organic/sulfides associated fraction were dominantly removed. The washing of coarse soil particles was highly efficient, but that of fine soil particles($<74{\mu}m$) was recalcitrant due to the enrichment with contaminants. Moreover, the physical separation of fine particles($<149{\mu}m$) enhanced the overall efficiency of soil washing. Therefore, both chemical extraction and separation of fine soil particles showed the high effectiveness of soil washing in the intersection point to minimize the amount of fine soil particles and to maximize the chemical extraction of contaminants.
Keywords
Arsenic; Zinc; Nickel; Soil washing; Fine soil particle;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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