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Equivalency of composite geosynthetic clay liners as a barrier to volatile organic compounds
Numerical and analytical models were used in the study to simulate contaminant transport of toluene in geosynthetic composite liners (GCL). Methods for demonstrating equivalency based on contaminant transport are also presented. Toluene was selected for the study because the transport properties of toluene are representative of those for volatile organic compounds (VOCs) commonly found in landfill leachate. Results from the model indicate that the mass flux of toluene through a GCL composite liner is as much as two orders of magnitude greater than that through a composite liner with a 61 cm thick soil liner (e.g. a Subtitle D liner) because a GCL composite liner is thinner. Performance of a GCL can be improved by adding an additional soil layer beneath the GCL, which reduces the concentration gradient across the base of the liner system. For the materials considered in the study, an additional 90 cm is sufficient to reduce the mass flux and increase the contaminant breakthrough time through the GCL composite liner to be comparable to that for a Subtitle D liner. A thinner layer can be used depending on the material properties of the soil and in particular, the porosity of the layer.
Equivalency of composite geosynthetic clay liners as a barrier to volatile organic compounds
Numerical and analytical models were used in the study to simulate contaminant transport of toluene in geosynthetic composite liners (GCL). Methods for demonstrating equivalency based on contaminant transport are also presented. Toluene was selected for the study because the transport properties of toluene are representative of those for volatile organic compounds (VOCs) commonly found in landfill leachate. Results from the model indicate that the mass flux of toluene through a GCL composite liner is as much as two orders of magnitude greater than that through a composite liner with a 61 cm thick soil liner (e.g. a Subtitle D liner) because a GCL composite liner is thinner. Performance of a GCL can be improved by adding an additional soil layer beneath the GCL, which reduces the concentration gradient across the base of the liner system. For the materials considered in the study, an additional 90 cm is sufficient to reduce the mass flux and increase the contaminant breakthrough time through the GCL composite liner to be comparable to that for a Subtitle D liner. A thinner layer can be used depending on the material properties of the soil and in particular, the porosity of the layer.
Equivalency of composite geosynthetic clay liners as a barrier to volatile organic compounds
Eignung von tongefüllten Geokunststoffen als Auskleidungsmaterial mit Barrierewirkung gegenüber flüchtigen organischen Verbindungen
Foose, G.J. (author) / Benson, C.H. (author) / Edil, T.B. (author)
1999
14 Seiten, 8 Bilder, 1 Tabelle, 9 Quellen
Conference paper
English
Equivalency of Composite Geosynthetic Clay Liners as a Barrier to Volatile Organic Compounds
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