American Society of Civil Engineers

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: and A. A. Amadi, (Dept. of Civil Engrg., Fed. Univ. of Tech. Minna, Nigeria E-mail:
Section: Geoenviromental Engineering Problems, pp. 2779-2786, (doi:

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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.

ASCE Subject Headings:
Comparative studies
Solid wastes
Soil pollution
Waste management