CUED Publications database

Effect of acid rain pH on leaching behavior of cement stabilized lead-contaminated soil.

Du, Y-J and Wei, M-L and Reddy, KR and Liu, Z-P and Jin, F (2014) Effect of acid rain pH on leaching behavior of cement stabilized lead-contaminated soil. J Hazard Mater, 271. pp. 131-140.

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Abstract

Cement stabilization is a practical approach to remediate soils contaminated with high levels of lead. However, the potential for leaching of lead out of these stabilized soils under variable acid rain pH conditions is a major environmental concern. This study investigates the effects of acid rain on the leaching characteristics of cement stabilized lead contaminated soil under different pH conditions. Clean kaolin clay and the same soil spiked with 2% lead contamination are stabilized with cement contents of 12 and 18% and then cured for 28 days. The soil samples are then subjected to a series of accelerated leaching tests (or semi-dynamic leaching tests) using a simulated acid rain leachant prepared at pH 2.0, 4.0 or 7.0. The results show that the strongly acidic leachant (pH ∼2.0) significantly altered the leaching behavior of lead as well as calcium present in the soil. However, the differences in the leaching behavior of the soil when the leachant was mildly acidic (pH ∼4.0) and neutral (pH ∼7.0) prove to be minor. In addition, it is observed that the lead contamination and cement content levels can have a considerable impact on the leaching behavior of the soils. Overall, the leachability of lead and calcium is attributed to the stability of the hydration products and their consequent influence on the soil buffering capacity and structure.

Item Type: Article
Uncontrolled Keywords: Acid rain Diffusion coefficient Dynamic leaching Lead Solidification/stabilization Acid Rain Calcium Construction Materials Hydrogen-Ion Concentration Kaolin Lead Soil Pollutants Waste Management
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:58
Last Modified: 19 Sep 2017 01:28
DOI: