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An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps

Huaxiang Yan, Jiawei Wu, Haijian Xie, Hywel Thomas Orcid Logo, Shijin Feng

International Journal for Numerical and Analytical Methods in Geomechanics, Volume: 43, Issue: 15, Pages: 2471 - 2490

Swansea University Author: Hywel Thomas Orcid Logo

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DOI (Published version): 10.1002/nag.2992

Abstract

An analytical model for contaminant transport in multilayered capped contaminated sediments including the degradation of organic contaminant is presented. The effect of benthic boundary layer was treated as a Robin‐type boundary condition. The results of the proposed analytical model agree well with...

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Published in: International Journal for Numerical and Analytical Methods in Geomechanics
ISSN: 0363-9061 1096-9853
Published: Wiley 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa52884
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first_indexed 2019-11-26T13:15:42Z
last_indexed 2020-09-17T03:15:50Z
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spelling 2019-11-26T11:04:38.4604056 v2 52884 2019-11-26 An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps 08ebc76b093f3e17fed29281f5cb637e 0000-0002-3951-0409 Hywel Thomas Hywel Thomas true false 2019-11-26 CIVL An analytical model for contaminant transport in multilayered capped contaminated sediments including the degradation of organic contaminant is presented. The effect of benthic boundary layer was treated as a Robin‐type boundary condition. The results of the proposed analytical model agree well with experimental data. The biodegradation of contaminant in bioturbation layer shows a significant influence on the flux at the surface of system. The maximum flux for the case with t1/2,bio = 0.07 year can be 4.5 times less than that of the case without considering the effect of biodegradation. The thickness of bioturbation layer has a significant effect on the performance of the capped contaminated sediment. The maximum flux for the case with lbio = 15 cm can be 17 times larger than that of the case without bioturbation layer. This may be because the effective diffusion coefficient of sand cap can be 28 times lower than Dbio. The mass transfer coefficient should be considered for the design of the capping system as the contaminant concentration at the top of system for the case with kbl = 2.5 × 10−5 cm/s can be 13 times greater than that of the case with kbl = 10−4 cm/s. The proposed analytical model can be used for verification of complicated numerical methods, evaluation of experimental data, and design of the capping contaminated sediment systems with reactive cap layers. Journal Article International Journal for Numerical and Analytical Methods in Geomechanics 43 15 2471 2490 Wiley 0363-9061 1096-9853 25 10 2019 2019-10-25 10.1002/nag.2992 http://orca.cf.ac.uk/125026/ COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2019-11-26T11:04:38.4604056 2019-11-26T11:04:38.4604056 Huaxiang Yan 1 Jiawei Wu 2 Haijian Xie 3 Hywel Thomas 0000-0002-3951-0409 4 Shijin Feng 5
title An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps
spellingShingle An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps
Hywel Thomas
title_short An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps
title_full An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps
title_fullStr An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps
title_full_unstemmed An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps
title_sort An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps
author_id_str_mv 08ebc76b093f3e17fed29281f5cb637e
author_id_fullname_str_mv 08ebc76b093f3e17fed29281f5cb637e_***_Hywel Thomas
author Hywel Thomas
author2 Huaxiang Yan
Jiawei Wu
Haijian Xie
Hywel Thomas
Shijin Feng
format Journal article
container_title International Journal for Numerical and Analytical Methods in Geomechanics
container_volume 43
container_issue 15
container_start_page 2471
publishDate 2019
institution Swansea University
issn 0363-9061
1096-9853
doi_str_mv 10.1002/nag.2992
publisher Wiley
url http://orca.cf.ac.uk/125026/
document_store_str 0
active_str 0
description An analytical model for contaminant transport in multilayered capped contaminated sediments including the degradation of organic contaminant is presented. The effect of benthic boundary layer was treated as a Robin‐type boundary condition. The results of the proposed analytical model agree well with experimental data. The biodegradation of contaminant in bioturbation layer shows a significant influence on the flux at the surface of system. The maximum flux for the case with t1/2,bio = 0.07 year can be 4.5 times less than that of the case without considering the effect of biodegradation. The thickness of bioturbation layer has a significant effect on the performance of the capped contaminated sediment. The maximum flux for the case with lbio = 15 cm can be 17 times larger than that of the case without bioturbation layer. This may be because the effective diffusion coefficient of sand cap can be 28 times lower than Dbio. The mass transfer coefficient should be considered for the design of the capping system as the contaminant concentration at the top of system for the case with kbl = 2.5 × 10−5 cm/s can be 13 times greater than that of the case with kbl = 10−4 cm/s. The proposed analytical model can be used for verification of complicated numerical methods, evaluation of experimental data, and design of the capping contaminated sediment systems with reactive cap layers.
published_date 2019-10-25T04:05:31Z
_version_ 1763753414358990848
score 11.037056

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