TY - GEN
T1 - Effect of consolidation on VOC transport through a GM/GCL composite liner system
AU - Pu, Hefu
AU - Shackelford, Charles D.
AU - Fox, Patrick J.
N1 - Publisher Copyright:
© Springer Nature Singapore Pte Ltd. 2019.
PY - 2019
Y1 - 2019
N2 - This paper presents the results of a numerical investigation of the transport of a volatile organic compound (VOC) through a composite liner system comprising a geomembrane (GM) overlying and in intimate contact with a geosynthetic clay liner (GCL), which is commonly used as an engineered barrier for containment of solid waste. The simulations were performed using the established CST2 model (i.e., Consolidation and Solute Transport 2). The results are presented in the form of VOC mass flux, cumulative VOC mass outflow, and distribution of VOC concentration within the GCL. Consolidation of the 10-mm-thick GCL is shown to result in a decrease in the thickness, void ratio, and effective diffusion coefficient of 41%, 49%, and 72%, respectively, such that the steady-state TCE mass flux and cumulative TCE mass outflow at the bottom of the GCL decreased by 47% and 43%, respectively, relative to results for traditional diffusive simulations that ignore the effect of consolidation. Thus, despite the thinness of the GCL, the effect of consolidation on the transport properties of the GCL can result in a significant decrease in VOC transport through a composite GM/GCL liner system.
AB - This paper presents the results of a numerical investigation of the transport of a volatile organic compound (VOC) through a composite liner system comprising a geomembrane (GM) overlying and in intimate contact with a geosynthetic clay liner (GCL), which is commonly used as an engineered barrier for containment of solid waste. The simulations were performed using the established CST2 model (i.e., Consolidation and Solute Transport 2). The results are presented in the form of VOC mass flux, cumulative VOC mass outflow, and distribution of VOC concentration within the GCL. Consolidation of the 10-mm-thick GCL is shown to result in a decrease in the thickness, void ratio, and effective diffusion coefficient of 41%, 49%, and 72%, respectively, such that the steady-state TCE mass flux and cumulative TCE mass outflow at the bottom of the GCL decreased by 47% and 43%, respectively, relative to results for traditional diffusive simulations that ignore the effect of consolidation. Thus, despite the thinness of the GCL, the effect of consolidation on the transport properties of the GCL can result in a significant decrease in VOC transport through a composite GM/GCL liner system.
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U2 - 10.1007/978-981-13-2224-2_74
DO - 10.1007/978-981-13-2224-2_74
M3 - Conference contribution
AN - SCOPUS:85060610689
SN - 9789811322235
T3 - Environmental Science and Engineering
SP - 601
EP - 607
BT - Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2 - Towards a Sustainable Geoenvironment
A2 - Bouazza, Abdelmalek
A2 - Zhan, Liangtong
A2 - Chen, Yunmin
PB - Springer Berlin Heidelberg
T2 - 8th International Congress on Environmental Geotechnics, ICEG 2018
Y2 - 28 October 2018 through 1 November 2018
ER -
