Hydraulic Conductivity Performance of Geosynthetic Clay Liner (GCL) Permeated with Inorganic Chemical Solutions

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Hydraulic conductivity performance of a geosynthetic clay liner permeated with inorganic chemical solutions is discussed. Although GCLs are expected to be applied to bottom liners and/or covers to contain wastes in landfills, limited data on the chemical compatibility are available. In this study, the brief literature review as well as the hydraulic conductivity test results are presented. The literature review shows there are some significant factors affecting the hydraulic conductivity values on GCLs permeated with chemical solutions. For the experimental work, hydraulic conductivity tests were conducted on a needle-punched GCL with inorganic chemical solutions by using flexible-wall permeameters to assess the effect of the concentration, pH, and other factors. Experimental results showed (1) a significant increase in hydraulic conductivity occur between 0.01-0.1M in concentration for divalent and trivalent cations, (2) monovalent cations has less effect on hydraulic conductivity than divalent cations, (3) the hydraulic conductivity is affected by both pH and cation concentrations, and (4) an excellent agreement between the hydraulic conductivity and free swell volume is achieved.
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