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http://dx.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  

Lee, Yun-Hee (Department of Railroad, Civil & Environmental Engineering, Woosong University)
Oa, Seong-Wook (Department of Railroad, Civil & Environmental Engineering, Woosong University)
Publication Information
Environmental Engineering Research / v.17, no.3, 2012 , pp. 145-150 More about this Journal
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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