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Microbial responses to elevated temperature: Evaluating bentonite mineralogy and copper canister corrosion within the long-term stability of deep geological repositories of nuclear waste

Marcos F. Martinez-Moreno, Cristina Povedano-Priego, Adam Mumford, Mar Morales-Hidalgo, Kristel Mijnendonckx, Fadwa Jroundi, Jesus Ojeda Ledo Orcid Logo, Mohamed L. Merroun

Science of The Total Environment, Volume: 915, Start page: 170149

Swansea University Authors: Adam Mumford, Jesus Ojeda Ledo Orcid Logo

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DOI (Published version): 10.1016/j.scitotenv.2024.170149

Abstract

Deep Geological Repositories (DGRs) consist of radioactive waste contained in corrosion-resistant canisters, surrounded by compacted bentonite clay, and buried few hundred meters in a stable geological formation. The effects of bentonite microbial communities on the long-term stability of the reposi...

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Published in: Science of The Total Environment
ISSN: 0048-9697
Published: Elsevier BV 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa65446
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The effects of bentonite microbial communities on the long-term stability of the repository should be assessed. This study explores the impact of harsh conditions (60 ºC, highly-compacted bentonite, low water activity), and acetate:lactate:sulfate addition, on the evolution of microbial communities, and their effect on the bentonite mineralogy, and corrosion of copper material under anoxic conditions. No bentonite illitization was observed in the treatments, confirming its mineralogical stability as an effective barrier for future DGR. Anoxic incubation at 60 ºC reduced the microbial diversity, with Pseudomonas as the dominant genus. Culture-dependent methods showed survival and viability at 60 ºC of moderate-thermophilic aerobic bacterial isolates (e.g., Aeribacillus). Despite the low presence of sulfate-reducing bacteria in the bentonite blocks, we proved their survival at 30 ºC but not at 60 ºC. Copper disk´s surface remained visually unaltered. However, in the acetate:lactate:sulfate-treated samples, sulfide/sulfate signals were detected, along with microbial-related compounds. 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spelling v2 65446 2024-01-12 Microbial responses to elevated temperature: Evaluating bentonite mineralogy and copper canister corrosion within the long-term stability of deep geological repositories of nuclear waste 950f680b2dfca0e78d8dd229be5babd7 Adam Mumford Adam Mumford true false 4c1c9800dffa623353dff0ab1271be64 0000-0002-2046-1010 Jesus Ojeda Ledo Jesus Ojeda Ledo true false 2024-01-12 Deep Geological Repositories (DGRs) consist of radioactive waste contained in corrosion-resistant canisters, surrounded by compacted bentonite clay, and buried few hundred meters in a stable geological formation. The effects of bentonite microbial communities on the long-term stability of the repository should be assessed. This study explores the impact of harsh conditions (60 ºC, highly-compacted bentonite, low water activity), and acetate:lactate:sulfate addition, on the evolution of microbial communities, and their effect on the bentonite mineralogy, and corrosion of copper material under anoxic conditions. No bentonite illitization was observed in the treatments, confirming its mineralogical stability as an effective barrier for future DGR. Anoxic incubation at 60 ºC reduced the microbial diversity, with Pseudomonas as the dominant genus. Culture-dependent methods showed survival and viability at 60 ºC of moderate-thermophilic aerobic bacterial isolates (e.g., Aeribacillus). Despite the low presence of sulfate-reducing bacteria in the bentonite blocks, we proved their survival at 30 ºC but not at 60 ºC. Copper disk´s surface remained visually unaltered. However, in the acetate:lactate:sulfate-treated samples, sulfide/sulfate signals were detected, along with microbial-related compounds. These findings offer new insights into the impact of high temperatures (60ºC) on the biogeochemical processes at the compacted bentonite/Cu canister interface post-repository closure. Journal Article Science of The Total Environment 915 170149 Elsevier BV 0048-9697 Nuclear repository, compacted bentonite, high temperature, microbial diversity, sulfate-reducing bacteria, copper corrosion 10 3 2024 2024-03-10 10.1016/j.scitotenv.2024.170149 COLLEGE NANME COLLEGE CODE Swansea University Another institution paid the OA fee The present work was supported by the grant RTI2018–101548-B-I00 “ERDF A way of making Europe” to MLM from the “Ministerio de Ciencia, Innovación y Universidades” (Spanish Government). The project leading to this application has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 847593 to MLM. ADM acknowledges funding from the UK Engineering and Physical Sciences Research Council (EPSRC) DTP scholarship (project reference: 2748843). MFM-M acknowledges the Federation of European Microbiological Societies (FEMS) for the award of a Research and Training Grant (FEMS-GO-2021-077) at the SCK CEN (Belgium). 2024-03-21T11:10:49.5199279 2024-01-12T02:58:43.6786846 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Marcos F. Martinez-Moreno 1 Cristina Povedano-Priego 2 Adam Mumford 3 Mar Morales-Hidalgo 4 Kristel Mijnendonckx 5 Fadwa Jroundi 6 Jesus Ojeda Ledo 0000-0002-2046-1010 7 Mohamed L. Merroun 8 65446__29460__c07cfbef7bf4417eaf54efe26d44beac.pdf 1-s2.0-S0048969724002833-main-2.pdf 2024-01-20T19:22:28.4886934 Output 5472456 application/pdf Version of Record true © 2024 The Authors. This is an open access article under the CC BY-NC license. true eng http://creativecommons.org/licenses/by-nc/4.0/
title Microbial responses to elevated temperature: Evaluating bentonite mineralogy and copper canister corrosion within the long-term stability of deep geological repositories of nuclear waste
spellingShingle Microbial responses to elevated temperature: Evaluating bentonite mineralogy and copper canister corrosion within the long-term stability of deep geological repositories of nuclear waste
Adam Mumford
Jesus Ojeda Ledo
title_short Microbial responses to elevated temperature: Evaluating bentonite mineralogy and copper canister corrosion within the long-term stability of deep geological repositories of nuclear waste
title_full Microbial responses to elevated temperature: Evaluating bentonite mineralogy and copper canister corrosion within the long-term stability of deep geological repositories of nuclear waste
title_fullStr Microbial responses to elevated temperature: Evaluating bentonite mineralogy and copper canister corrosion within the long-term stability of deep geological repositories of nuclear waste
title_full_unstemmed Microbial responses to elevated temperature: Evaluating bentonite mineralogy and copper canister corrosion within the long-term stability of deep geological repositories of nuclear waste
title_sort Microbial responses to elevated temperature: Evaluating bentonite mineralogy and copper canister corrosion within the long-term stability of deep geological repositories of nuclear waste
author_id_str_mv 950f680b2dfca0e78d8dd229be5babd7
4c1c9800dffa623353dff0ab1271be64
author_id_fullname_str_mv 950f680b2dfca0e78d8dd229be5babd7_***_Adam Mumford
4c1c9800dffa623353dff0ab1271be64_***_Jesus Ojeda Ledo
author Adam Mumford
Jesus Ojeda Ledo
author2 Marcos F. Martinez-Moreno
Cristina Povedano-Priego
Adam Mumford
Mar Morales-Hidalgo
Kristel Mijnendonckx
Fadwa Jroundi
Jesus Ojeda Ledo
Mohamed L. Merroun
format Journal article
container_title Science of The Total Environment
container_volume 915
container_start_page 170149
publishDate 2024
institution Swansea University
issn 0048-9697
doi_str_mv 10.1016/j.scitotenv.2024.170149
publisher Elsevier BV
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 Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
document_store_str 1
active_str 0
description Deep Geological Repositories (DGRs) consist of radioactive waste contained in corrosion-resistant canisters, surrounded by compacted bentonite clay, and buried few hundred meters in a stable geological formation. The effects of bentonite microbial communities on the long-term stability of the repository should be assessed. This study explores the impact of harsh conditions (60 ºC, highly-compacted bentonite, low water activity), and acetate:lactate:sulfate addition, on the evolution of microbial communities, and their effect on the bentonite mineralogy, and corrosion of copper material under anoxic conditions. No bentonite illitization was observed in the treatments, confirming its mineralogical stability as an effective barrier for future DGR. Anoxic incubation at 60 ºC reduced the microbial diversity, with Pseudomonas as the dominant genus. Culture-dependent methods showed survival and viability at 60 ºC of moderate-thermophilic aerobic bacterial isolates (e.g., Aeribacillus). Despite the low presence of sulfate-reducing bacteria in the bentonite blocks, we proved their survival at 30 ºC but not at 60 ºC. Copper disk´s surface remained visually unaltered. However, in the acetate:lactate:sulfate-treated samples, sulfide/sulfate signals were detected, along with microbial-related compounds. These findings offer new insights into the impact of high temperatures (60ºC) on the biogeochemical processes at the compacted bentonite/Cu canister interface post-repository closure.
published_date 2024-03-10T11:10:46Z
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