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Modelling coupled microbial processes in the subsurface: Model development, verification, evaluation and application

Shakil A. Masum, Hywel Thomas Orcid Logo

Advances in Water Resources, Volume: 116, Pages: 1 - 17

Swansea University Author: Hywel Thomas Orcid Logo

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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...

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Published in: Advances in Water Resources
ISSN: 0309-1708
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa52882
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spelling 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
author_id_str_mv 08ebc76b093f3e17fed29281f5cb637e
author_id_fullname_str_mv 08ebc76b093f3e17fed29281f5cb637e_***_Hywel Thomas
author Hywel Thomas
author2 Shakil A. Masum
Hywel Thomas
format Journal article
container_title Advances in Water Resources
container_volume 116
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publishDate 2018
institution Swansea University
issn 0309-1708
doi_str_mv 10.1016/j.advwatres.2018.03.015
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str 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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