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Environmental Engineering Research 2012;17(3): 145-150. DOI: https://doi.org/10.4491/eer.2012.17.3.145
Desorption Kinetics and Removal Characteristics of Pb-Contaminated Soil by the Soil Washing Method: Mixing Ratios and Particle Sizes
Yunhee Lee, and Seong-Wook Oa
Department of Railroad, Civil & Environmental Engineering, Woosong University, Daejeon 300-718, Korea
Corresponding Author: Seong-Wook Oa ,Tel: +82-42-629-6715, Fax: +82-42-636-2674, Email: swoa@wsu.ac.kr
Received: March 13, 2012;  Accepted: August 10, 2012.
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ABSTRACT
Pb-contaminated soil at a clay shooting range was analyzed by the sequential extraction method to identify metal binding properties in terms of detrital and non-detrital forms of the soil. Most of the metals in the soils existed as non-detrital forms, exchangeable and carbonate-bound forms, which could be easily released from the soil by a washing method. Therefore, the characteristics of Pb desorption for remediation of the Pb-contaminated soil were evaluated using hydrochloric acid (HCl) by a washing method. Batch experiments were performed to identify the factors influencing extraction efficiency. The effects of the solid to liquid (S/L) ratio (1:2, 1:3, and 1:4), soil particle size, and extraction time on the removal capacity of Pb by HCl were evaluated. Soil samples were collected from two different areas: a slope area (SA) and a land area (LA) at the field. As results, the optimal conditions at 2.8 to 0.075 mm of particle size were 1:3 of the S/L ratio and 10 min of extraction time for SA, and 1:4 of the S/L ratio and 5 min of extraction time for LA. The characteristics of Pb desorption were adequately described by two-reaction kinetic models.
Keywords: Hydrochloric acid | Lead | Solid to liquid ratio | Subsequent extraction method | Two-reaction model
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