Comparative Assessment of Contaminant Sorption in Lateritic Soil—Bentonite Mixtures
by K. J. Osinubi, (Dept. of Civil Engrg., Ahmadu Bello Univ., Zaria 810001, Nigeria E-mail: kosinubi@yahoo.com) and A. A. Amadi, (Dept. of Civil Engrg., Fed. Univ. of Tech. Minna, Nigeria E-mail: agapitusahamefule4@yahoo.com)
Section: Geoenviromental Engineering Problems, pp. 2779-2786, (doi: http://dx.doi.org/10.1061/41095(365)282)
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| Document type: |
Conference Proceeding Paper |
| Part of: |
GeoFlorida 2010: Advances in Analysis, Modeling & Design |
| Abstract: |
The sorption of contaminants to lateritic soil treated with up to 10% bentonite by dry weight of soil through batch equilibrium tests using three municipal waste leachate solutions was considered. Test results were used to determine the partition (Kp)/distribution (Kd) coefficients of target contaminants namely, lead (Pb), sodium (Na) and potassium (K). For the natural soil, Kp/Kd values were established as 2.01 (Pb), 0.2 (Na) and 0.77 (K), while for samples containing 10% bentonite they were 3.97 (Pb), 0.46 (Na) and 3.03 (K). The removal capacity of the mixture containing 10% bentonite is about four fold that of the natural soil in the case of K+, twice for Na+and twice for Pb2+. Contaminant sorption increased with higher bentonite content and pH. Lateritic soil can be effectively utilized in the design of landfill liner systems by treating it with low percent bentonite. |
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