Effect of consolidation on VOC transport through a GM/GCL composite liner system

Hefu Pu, Charles D. Shackelford, Patrick Joseph Fox

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish (US)
Title of host publicationProceedings of the 8th International Congress on Environmental Geotechnics Volume 2 - Towards a Sustainable Geoenvironment
EditorsAbdelmalek Bouazza, Liangtong Zhan, Yunmin Chen
PublisherSpringer Berlin Heidelberg
Pages601-607
Number of pages7
ISBN (Print)9789811322235
DOIs
StatePublished - Jan 1 2019
Event8th International Congress on Environmental Geotechnics, ICEG 2018 - Hangzhou, China
Duration: Oct 28 2018Nov 1 2018

Publication series

NameEnvironmental Science and Engineering
ISSN (Print)1863-5520
ISSN (Electronic)1863-5539

Other

Other8th International Congress on Environmental Geotechnics, ICEG 2018
CountryChina
CityHangzhou
Period10/28/1811/1/18

Fingerprint

Geomembranes
Volatile organic compounds
Consolidation
Clay
Composite materials
Mass transfer
Solute transport
Solid wastes
Transport properties

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Environmental Engineering

Cite this

Pu, H., Shackelford, C. D., & Fox, P. J. (2019). Effect of consolidation on VOC transport through a GM/GCL composite liner system. In A. Bouazza, L. Zhan, & Y. Chen (Eds.), Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2 - Towards a Sustainable Geoenvironment (pp. 601-607). (Environmental Science and Engineering). Springer Berlin Heidelberg. https://doi.org/10.1007/978-981-13-2224-2_74
Pu, Hefu ; Shackelford, Charles D. ; Fox, Patrick Joseph. / Effect of consolidation on VOC transport through a GM/GCL composite liner system. Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2 - Towards a Sustainable Geoenvironment. editor / Abdelmalek Bouazza ; Liangtong Zhan ; Yunmin Chen. Springer Berlin Heidelberg, 2019. pp. 601-607 (Environmental Science and Engineering).
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Pu, H, Shackelford, CD & Fox, PJ 2019, Effect of consolidation on VOC transport through a GM/GCL composite liner system. in A Bouazza, L Zhan & Y Chen (eds), Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2 - Towards a Sustainable Geoenvironment. Environmental Science and Engineering, Springer Berlin Heidelberg, pp. 601-607, 8th International Congress on Environmental Geotechnics, ICEG 2018, Hangzhou, China, 10/28/18. https://doi.org/10.1007/978-981-13-2224-2_74

Effect of consolidation on VOC transport through a GM/GCL composite liner system. / Pu, Hefu; Shackelford, Charles D.; Fox, Patrick Joseph.

Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2 - Towards a Sustainable Geoenvironment. ed. / Abdelmalek Bouazza; Liangtong Zhan; Yunmin Chen. Springer Berlin Heidelberg, 2019. p. 601-607 (Environmental Science and Engineering).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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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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PB - Springer Berlin Heidelberg

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Pu H, Shackelford CD, Fox PJ. Effect of consolidation on VOC transport through a GM/GCL composite liner system. In Bouazza A, Zhan L, Chen Y, editors, Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2 - Towards a Sustainable Geoenvironment. Springer Berlin Heidelberg. 2019. p. 601-607. (Environmental Science and Engineering). https://doi.org/10.1007/978-981-13-2224-2_74