Abstract
New regulations established for the disposal of coal combustion products (CCPs) in the United States require that disposal facilities include a composite liner consisting of a geomembrane overlying a 0.6-m-thick clay liner. Alternative liner configurations are also permissible provided that leakage rate criteria in the regulations are met. Geosynthetic clay liners (GCLs) can be used in lieu of the clay liner component as a cost-effective alternative. GCLs are thin prefabricated clay liners consisting of sodium-bentonite (Na-B) sandwiched between two geotextiles. As the new regulations have been implemented, however, a large number of waste streams from coal-fired power plants have been encountered with concentrated leachates. Virtually none of the conventional Na-B GCLs can retain these concentrated leachates, and these new commercially available bentonite-polymer (B-P) GCLs is needed to manage CCP leachates. This chapter summarizes the recent research findings on the hydraulic conductivity of B-P GCL exposed to leachate from CCP disposal facilities.
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