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Environmental Engineering Research 2005;10(3): 112-121. DOI: https://doi.org/10.4491/eer.2005.10.3.112
LEAD LEACHABILITY FROM QUICKLIME TREATED SOILS IN A DIFFUSION CONTROLLED ENVIRONMENT
Deok Hyun Moon
W. M. Keck Geoenvironmental Laboratory, Center for Environmental Systems, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, NJ 07030, USA
Corresponding Author: Deok Hyun Moon ,Tel: 201-216-80, Fax: 201-216-8212, Email: dmoon@stevens.edu
Received: February 10, 2005;  Accepted: May 7, 2005.
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ABSTRACT
The effectiveness of quicklime-based stabilization/solidification (S/S) in immobilizing lead (Pb) was assessed by performing semi-dynamic leaching tests (ANSI6.1). In order to simulate landfill leaching conditions, the ANS 16.1 test was modified by using 0.014 N acetic acid (pH = 3.25) instead of distilled water. Artificial soil samples as well as field soil samples contaminated with Pb were tested. The effectiveness of quicklime treatment was evaluated by determining diffusion coefficients (De) and leachability indices (LX). A model developed by de Groot and van der Sloot was used to elucidate the controlling Pb leaching mechanisms. Overall, upon quicklime treatment Pb leachability was significantly reduced in all of the samples tested. The mean LX values were higher than 9 for an artificial soil sample containing 30% kaolinite treated with 10% quicklime and for a field soil sample treated with 10% quicklime, which suggests that S/S treated soils can be considered acceptable for "controlled utilization". Moreover, quicklime treatment was more effective in artificially contaminated soil with high kaolinite content (30%), indicating the amount of clay plays an important role in the success of the treatment. The controlling Pb leaching mechanism was found to be diffusion, in all quicklime treated samples.
Keywords: lead (Pb) | semi-dynamic leaching test (ANS 16.1) | stabilization/solidification (S/S) | quicklime | diffusion coefficient (De) | leachability index (LX) | diffusion
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