Organoclay obtained from two constituents’ coco-dimethyl benzyl ammonium chloride, and bentonite was used
in this study to prepare five admixtures, by varying the amount of organoclay, natural soil, and bentonite. Laboratory experiments
were conducted on these admixtures with the objective of identification and assessment of their potential for
use in landfill liners. The admixtures had the organoclay ranging from 10 to 25%, and bentonite in the range of 0 to 20%.
The admixtures prepared were evaluated by conducting laboratory sorption tests and permeability tests for the determination
of retardation coefficient, and hydraulic conductivity. Permeability tests were conducted using consolidation permeameter.
Total Organic Carbon (TOC) was determined using TOC Analyzer. Admixture with higher percentage of organoclay
exhibits higher organic sorption capacity. Retardation coefficient of the admixtures was determined by curve fitting
the experimental data of sorption tests to fit to Freundlich (nonlinear) sorption isotherm. One-dimensional transport
simulations were performed to evaluate completely the effectiveness of these materials for use as landfill liner and to develop
design charts for determining required liner thickness.