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Modelling coupled microbial processes in the subsurface: Model development, verification, evaluation and application
Advances in Water Resources, Volume: 116, Pages: 1 - 17
Swansea University Author: Hywel Thomas
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DOI (Published version): 10.1016/j.advwatres.2018.03.015
Abstract
To study subsurface microbial processes, a coupled model which has been developed within a Thermal-Hydraulic-Chemical-Mechanical (THCM) framework is presented. The work presented here, focuses on microbial transport, growth and decay mechanisms under the influence of multiphase flow and bio-geochemi...
Published in: | Advances in Water Resources |
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ISSN: | 0309-1708 |
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2018
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URI: | https://cronfa.swan.ac.uk/Record/cronfa52882 |
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2021-01-15T10:31:37.8762061 v2 52882 2019-11-26 Modelling coupled microbial processes in the subsurface: Model development, verification, evaluation and application 08ebc76b093f3e17fed29281f5cb637e 0000-0002-3951-0409 Hywel Thomas Hywel Thomas true false 2019-11-26 CIVL To study subsurface microbial processes, a coupled model which has been developed within a Thermal-Hydraulic-Chemical-Mechanical (THCM) framework is presented. The work presented here, focuses on microbial transport, growth and decay mechanisms under the influence of multiphase flow and bio-geochemical reactions. In this paper, theoretical formulations and numerical implementations of the microbial model are presented. The model has been verified and also evaluated against relevant experimental results. Simulated results show that the microbial processes have been accurately implemented and their impacts on porous media properties can be predicted either qualitatively or quantitatively or both. The model has been applied to investigate biofilm growth in a sandstone core that is subjected to a two-phase flow and variable pH conditions. The results indicate that biofilm growth (if not limited by substrates) in a multiphase system largely depends on the hydraulic properties of the medium. When the change in porewater pH which occurred due to dissolution of carbon dioxide gas is considered, growth processes are affected. For the given parameter regime, it has been shown that the net biofilm growth is favoured by higher pH; whilst the processes are considerably retarded at lower pH values. The capabilities of the model to predict microbial respiration in a fully coupled multiphase flow condition and microbial fermentation leading to production of a gas phase are also demonstrated. Journal Article Advances in Water Resources 116 1 17 0309-1708 Microbial, Coupled, Transport, Reaction, Model development, Applications 1 6 2018 2018-06-01 10.1016/j.advwatres.2018.03.015 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2021-01-15T10:31:37.8762061 2019-11-26T10:50:01.5337543 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Shakil A. Masum 1 Hywel Thomas 0000-0002-3951-0409 2 52882__15967__18ce9cfe02ab45719259039bc85bfaab.pdf masum.pdf 2019-11-26T10:58:15.6020121 Output 18934371 application/pdf Accepted Manuscript true 2019-11-26T00:00:00.0000000 Released under the terms of a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND). true eng |
title |
Modelling coupled microbial processes in the subsurface: Model development, verification, evaluation and application |
spellingShingle |
Modelling coupled microbial processes in the subsurface: Model development, verification, evaluation and application Hywel Thomas |
title_short |
Modelling coupled microbial processes in the subsurface: Model development, verification, evaluation and application |
title_full |
Modelling coupled microbial processes in the subsurface: Model development, verification, evaluation and application |
title_fullStr |
Modelling coupled microbial processes in the subsurface: Model development, verification, evaluation and application |
title_full_unstemmed |
Modelling coupled microbial processes in the subsurface: Model development, verification, evaluation and application |
title_sort |
Modelling coupled microbial processes in the subsurface: Model development, verification, evaluation and application |
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08ebc76b093f3e17fed29281f5cb637e |
author_id_fullname_str_mv |
08ebc76b093f3e17fed29281f5cb637e_***_Hywel Thomas |
author |
Hywel Thomas |
author2 |
Shakil A. Masum Hywel Thomas |
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Journal article |
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Advances in Water Resources |
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116 |
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2018 |
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Swansea University |
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0309-1708 |
doi_str_mv |
10.1016/j.advwatres.2018.03.015 |
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Faculty of Science and Engineering |
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Faculty of Science and Engineering |
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School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering |
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description |
To study subsurface microbial processes, a coupled model which has been developed within a Thermal-Hydraulic-Chemical-Mechanical (THCM) framework is presented. The work presented here, focuses on microbial transport, growth and decay mechanisms under the influence of multiphase flow and bio-geochemical reactions. In this paper, theoretical formulations and numerical implementations of the microbial model are presented. The model has been verified and also evaluated against relevant experimental results. Simulated results show that the microbial processes have been accurately implemented and their impacts on porous media properties can be predicted either qualitatively or quantitatively or both. The model has been applied to investigate biofilm growth in a sandstone core that is subjected to a two-phase flow and variable pH conditions. The results indicate that biofilm growth (if not limited by substrates) in a multiphase system largely depends on the hydraulic properties of the medium. When the change in porewater pH which occurred due to dissolution of carbon dioxide gas is considered, growth processes are affected. For the given parameter regime, it has been shown that the net biofilm growth is favoured by higher pH; whilst the processes are considerably retarded at lower pH values. The capabilities of the model to predict microbial respiration in a fully coupled multiphase flow condition and microbial fermentation leading to production of a gas phase are also demonstrated. |
published_date |
2018-06-01T04:05:31Z |
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1763753414115721216 |
score |
10.99342 |