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An analytical model for vapor-phase volatile organic compound diffusion through landfill composite covers

Haijian Xie, Huaxiang Yan, Hywel Thomas Orcid Logo, Shijin Feng, Qihua Ran, Peixiong Chen

International Journal for Numerical and Analytical Methods in Geomechanics, Volume: 40, Issue: 13, Pages: 1827 - 1843

Swansea University Author: Hywel Thomas Orcid Logo

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DOI (Published version): 10.1002/nag.2514

Abstract

One‐dimensional mathematical models for vapor‐phase volatile organic compound (VOC) diffusion through composite cover barriers are presented. An analytical solution to the model was obtained by the method of separation of variables. The results obtained by the proposed solution agree well with those...

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Published in: International Journal for Numerical and Analytical Methods in Geomechanics
ISSN: 0363-9061
Published: Wiley 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa52879
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spelling 2019-11-26T10:42:26.8443150 v2 52879 2019-11-26 An analytical model for vapor-phase volatile organic compound diffusion through landfill composite covers 08ebc76b093f3e17fed29281f5cb637e 0000-0002-3951-0409 Hywel Thomas Hywel Thomas true false 2019-11-26 CIVL One‐dimensional mathematical models for vapor‐phase volatile organic compound (VOC) diffusion through composite cover barriers are presented. An analytical solution to the model was obtained by the method of separation of variables. The results obtained by the proposed solution agree well with those obtained by a numerical analysis. Based on the proposed analytical model, the VOC breakthrough curves of five different composite covers are compared. The effects of degree of saturation of geosynthetic clay liner (GCL) or compacted clay liner (CCL) on VOC migration in the composite covers are then presented. Results show that the composite cover barriers provide much better diffusion barriers for VOC than the single CCL. The top surface steady‐state flux for a composite barrier, consisting of a 1.5 mm geomembrane (GM) and a 20 cm CCL, can be 8.3 times lower than that for a 30 cm CCL. The surface steady‐state flux for the case with (1.5 mm GM + 6 mm GCL) was found to be 2.3 times lower than that for the case with (1.5 mm GM + 20 cm CCL). The degree of saturation Sr of the CCL has a great influence on VOC migration in composite covers when Sr is larger than 0.5. The steady‐state flux at the surface of GM for the case with Sr = 0.7 can be 1.8 times lower than that for the case with Sr = 0.2. The proposed analytical model is relatively simple and can be used for verification of complicated numerical models, analysis of experimental data and performance assessment of composite cover barriers. Journal Article International Journal for Numerical and Analytical Methods in Geomechanics 40 13 1827 1843 Wiley 0363-9061 1 9 2016 2016-09-01 10.1002/nag.2514 http://dx.doi.org/10.1002/nag.2514 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2019-11-26T10:42:26.8443150 2019-11-26T10:42:26.8443150 Haijian Xie 1 Huaxiang Yan 2 Hywel Thomas 0000-0002-3951-0409 3 Shijin Feng 4 Qihua Ran 5 Peixiong Chen 6
title An analytical model for vapor-phase volatile organic compound diffusion through landfill composite covers
spellingShingle An analytical model for vapor-phase volatile organic compound diffusion through landfill composite covers
Hywel Thomas
title_short An analytical model for vapor-phase volatile organic compound diffusion through landfill composite covers
title_full An analytical model for vapor-phase volatile organic compound diffusion through landfill composite covers
title_fullStr An analytical model for vapor-phase volatile organic compound diffusion through landfill composite covers
title_full_unstemmed An analytical model for vapor-phase volatile organic compound diffusion through landfill composite covers
title_sort An analytical model for vapor-phase volatile organic compound diffusion through landfill composite covers
author_id_str_mv 08ebc76b093f3e17fed29281f5cb637e
author_id_fullname_str_mv 08ebc76b093f3e17fed29281f5cb637e_***_Hywel Thomas
author Hywel Thomas
author2 Haijian Xie
Huaxiang Yan
Hywel Thomas
Shijin Feng
Qihua Ran
Peixiong Chen
format Journal article
container_title International Journal for Numerical and Analytical Methods in Geomechanics
container_volume 40
container_issue 13
container_start_page 1827
publishDate 2016
institution Swansea University
issn 0363-9061
doi_str_mv 10.1002/nag.2514
publisher Wiley
url http://dx.doi.org/10.1002/nag.2514
document_store_str 0
active_str 0
description One‐dimensional mathematical models for vapor‐phase volatile organic compound (VOC) diffusion through composite cover barriers are presented. An analytical solution to the model was obtained by the method of separation of variables. The results obtained by the proposed solution agree well with those obtained by a numerical analysis. Based on the proposed analytical model, the VOC breakthrough curves of five different composite covers are compared. The effects of degree of saturation of geosynthetic clay liner (GCL) or compacted clay liner (CCL) on VOC migration in the composite covers are then presented. Results show that the composite cover barriers provide much better diffusion barriers for VOC than the single CCL. The top surface steady‐state flux for a composite barrier, consisting of a 1.5 mm geomembrane (GM) and a 20 cm CCL, can be 8.3 times lower than that for a 30 cm CCL. The surface steady‐state flux for the case with (1.5 mm GM + 6 mm GCL) was found to be 2.3 times lower than that for the case with (1.5 mm GM + 20 cm CCL). The degree of saturation Sr of the CCL has a great influence on VOC migration in composite covers when Sr is larger than 0.5. The steady‐state flux at the surface of GM for the case with Sr = 0.7 can be 1.8 times lower than that for the case with Sr = 0.2. The proposed analytical model is relatively simple and can be used for verification of complicated numerical models, analysis of experimental data and performance assessment of composite cover barriers.
published_date 2016-09-01T04:05:31Z
_version_ 1763753413866160128
score 11.013507

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