A comparative assessment of volatile organic compound (VOC) sorption to various types of potential GCL bentonites |
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| Affiliation: | 1. Department of Civil Engineering, Dalhousie University, Sexton Campus, Room D215, 1360 Barrington Street, Halifax, NS, Canada B3J 1Z1;2. GeoEngineering Centre at Queen''s-RMC, Department of Civil Engineering, Queen''s University, Ellis Hall, Kingston, ON, Canada, K7L 3N6;1. Geotechnical and Geoenvironmental Engineering, GeoEngineering Centre at Queen’s-RMC, Queen’s University, Ellis Hall, Kingston, ON K7L 3N6, Canada;2. School of Environmental Studies, Queen’s University, Kingston, ON K7L 3N6, Canada;1. Irstea, Antony Regional Center, Hydrosystems and Bioprocesses Research Unit, 92761 Antony, France;2. Conservatoire National des Arts et Métiers, 2, rue Conté, 75141 Paris cedex 03, France;3. ISSAT, Sousse, Tunisia;4. RECOVER Research Unit, Irstea, 3275 Route Cézanne, CS 40061, 13182 Aix-en-Provence cedex 5, France;1. GeoEngineering Centre at Queen''s-RMC, Dept. of Civil Engineering, Queen''s Univ., Kingston, ON, K7L 3N6, Canada;2. Canada Research Chair in Geotechnical and Geoenvironmental Engineering, GeoEngineering Centre at Queen''s-RMC, Dept. of Civil Engineering, Queen''s Univ., Kingston, ON, K7L 3N6, Canada;1. GeoEngineering Centre at Queen''s-RMC, Queen''s University, Kingston, ON, K7L 3N6, Canada;2. GeoEngineering Centre at Queen''s-RMC, Queen''s University, Ellis Hall, Kingston, ON, K7L 3N6, Canada |
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| Abstract: | The potential improvement in the sorption of volatile organic compounds (VOCs) to bentonite used in Geosynthetic Clay Liners (GCLs) is examined for mixtures of bentonite and several organoclays or activated carbon. Results of batch tests performed with dichloromethane (DCM), 1,2-dichloroethane (1,2-DCA), trichloroethylene (TCE), benzene and toluene are reported. It is shown that all organoclays could potentially increase VOC sorption to GCLs by several orders of magnitude but activated carbon generally appears to provide the most improvement for the samples tested. The engineering relevance of this potential improvement is assessed with respect to design of municipal solid waste landfill liner systems by performing contaminant transport modeling. It is shown that only slight changes in contaminant migration will occur, despite the large potential increases in GCL sorption. This suggests that increased costs associated with modifying GCLs may outweigh the benefit of such additives to GCLs for municipal solid waste landfill applications for the conditions examined herein. |
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