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Microbial influence in Spanish bentonite slurry microcosms: unveiling a-year long geochemical evolution and early-stage copper corrosion related to nuclear waste repositories

Marcos F. Martinez-Moreno, Cristina Povedano-Priego, Mar Morales-Hidalgo, Adam Mumford, Elisabet Aranda, Ramiro Vilchez-Vargas, Fadwa Jroundi, Jesus Ojeda Ledo Orcid Logo, Mohamed L. Merroun

Environmental Pollution

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

Abstract

Deep Geological Repository (DGR) concept consists of storing radioactive waste in metal canisters, surrounded by compacted bentonite, and placed into a geological formation. Here, bentonite slurry microcosms with copper canister, inoculated with bacterial consortium and amended with acetate, lactate...

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Published in: Environmental Pollution
Published: Elsevier
URI: https://cronfa.swan.ac.uk/Record/cronfa66919
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Here, bentonite slurry microcosms with copper canister, inoculated with bacterial consortium and amended with acetate, lactate and sulfate were set up to investigate their geochemical evolution over a year under anoxic conditions. The impact of microbial communities on the corrosion of copper canister in an early-stage (45 days) was also assessed. The amended bacterial consortium and electron donors/acceptor accelerated the microbial activity, while bentonite heat-shocked process had a retarding effect. The microbial communities partially oxidize lactate to acetate which is subsequently consumed when the lactate is depleted. Early-stage microbial communities showed that the bacterial consortium reduced microbial diversity with Pseudomonas and Stenotrophomonas dominating the community. However, sulfate-reducing bacteria such as Desulfocurvibacter, Anaerosolibacter, and Desulfosporosinus were enriched coupling oxidation of lactate/acetate with reduction of sulfates. The generated biogenic sulfides could mediate the conversion of copper oxides (possibly formed by trapped oxygen molecules on the bentonite or driven by the reduction of H2O) to copper sulfide (Cu2S) identified by X-ray photoelectron spectroscopy (XPS). 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spelling v2 66919 2024-07-01 Microbial influence in Spanish bentonite slurry microcosms: unveiling a-year long geochemical evolution and early-stage copper corrosion related to nuclear waste repositories 65cb3dadba310d966d2494c03364df52 Adam Mumford Adam Mumford true false 4c1c9800dffa623353dff0ab1271be64 0000-0002-2046-1010 Jesus Ojeda Ledo Jesus Ojeda Ledo true false 2024-07-01 Deep Geological Repository (DGR) concept consists of storing radioactive waste in metal canisters, surrounded by compacted bentonite, and placed into a geological formation. Here, bentonite slurry microcosms with copper canister, inoculated with bacterial consortium and amended with acetate, lactate and sulfate were set up to investigate their geochemical evolution over a year under anoxic conditions. The impact of microbial communities on the corrosion of copper canister in an early-stage (45 days) was also assessed. The amended bacterial consortium and electron donors/acceptor accelerated the microbial activity, while bentonite heat-shocked process had a retarding effect. The microbial communities partially oxidize lactate to acetate which is subsequently consumed when the lactate is depleted. Early-stage microbial communities showed that the bacterial consortium reduced microbial diversity with Pseudomonas and Stenotrophomonas dominating the community. However, sulfate-reducing bacteria such as Desulfocurvibacter, Anaerosolibacter, and Desulfosporosinus were enriched coupling oxidation of lactate/acetate with reduction of sulfates. The generated biogenic sulfides could mediate the conversion of copper oxides (possibly formed by trapped oxygen molecules on the bentonite or driven by the reduction of H2O) to copper sulfide (Cu2S) identified by X-ray photoelectron spectroscopy (XPS). Overall, these findings shed light on the ideal geochemical conditions that would affect the stability of DGR barriers, emphasizing the impact of the SRB on the corrosion of the metal canisters, the gas generation, and the interaction with components of the bentonite. Journal Article Environmental Pollution Elsevier 0 0 0 0001-01-01 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 program 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). 2024-07-01T14:19:17.5054233 2024-07-01T14:09:59.9077411 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Marcos F. Martinez-Moreno 1 Cristina Povedano-Priego 2 Mar Morales-Hidalgo 3 Adam Mumford 4 Elisabet Aranda 5 Ramiro Vilchez-Vargas 6 Fadwa Jroundi 7 Jesus Ojeda Ledo 0000-0002-2046-1010 8 Mohamed L. Merroun 9 66919__30786__493cf44732db4167a58088720bc988cf.pdf ENVPOL-D-24-03401_R1 accepted manuscript.pdf 2024-07-01T14:18:22.5211261 Output 15953065 application/pdf Accepted Manuscript true false
title Microbial influence in Spanish bentonite slurry microcosms: unveiling a-year long geochemical evolution and early-stage copper corrosion related to nuclear waste repositories
spellingShingle Microbial influence in Spanish bentonite slurry microcosms: unveiling a-year long geochemical evolution and early-stage copper corrosion related to nuclear waste repositories
Adam Mumford
Jesus Ojeda Ledo
title_short Microbial influence in Spanish bentonite slurry microcosms: unveiling a-year long geochemical evolution and early-stage copper corrosion related to nuclear waste repositories
title_full Microbial influence in Spanish bentonite slurry microcosms: unveiling a-year long geochemical evolution and early-stage copper corrosion related to nuclear waste repositories
title_fullStr Microbial influence in Spanish bentonite slurry microcosms: unveiling a-year long geochemical evolution and early-stage copper corrosion related to nuclear waste repositories
title_full_unstemmed Microbial influence in Spanish bentonite slurry microcosms: unveiling a-year long geochemical evolution and early-stage copper corrosion related to nuclear waste repositories
title_sort Microbial influence in Spanish bentonite slurry microcosms: unveiling a-year long geochemical evolution and early-stage copper corrosion related to nuclear waste repositories
author_id_str_mv 65cb3dadba310d966d2494c03364df52
4c1c9800dffa623353dff0ab1271be64
author_id_fullname_str_mv 65cb3dadba310d966d2494c03364df52_***_Adam Mumford
4c1c9800dffa623353dff0ab1271be64_***_Jesus Ojeda Ledo
author Adam Mumford
Jesus Ojeda Ledo
author2 Marcos F. Martinez-Moreno
Cristina Povedano-Priego
Mar Morales-Hidalgo
Adam Mumford
Elisabet Aranda
Ramiro Vilchez-Vargas
Fadwa Jroundi
Jesus Ojeda Ledo
Mohamed L. Merroun
format Journal article
container_title Environmental Pollution
institution Swansea University
publisher Elsevier
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 Repository (DGR) concept consists of storing radioactive waste in metal canisters, surrounded by compacted bentonite, and placed into a geological formation. Here, bentonite slurry microcosms with copper canister, inoculated with bacterial consortium and amended with acetate, lactate and sulfate were set up to investigate their geochemical evolution over a year under anoxic conditions. The impact of microbial communities on the corrosion of copper canister in an early-stage (45 days) was also assessed. The amended bacterial consortium and electron donors/acceptor accelerated the microbial activity, while bentonite heat-shocked process had a retarding effect. The microbial communities partially oxidize lactate to acetate which is subsequently consumed when the lactate is depleted. Early-stage microbial communities showed that the bacterial consortium reduced microbial diversity with Pseudomonas and Stenotrophomonas dominating the community. However, sulfate-reducing bacteria such as Desulfocurvibacter, Anaerosolibacter, and Desulfosporosinus were enriched coupling oxidation of lactate/acetate with reduction of sulfates. The generated biogenic sulfides could mediate the conversion of copper oxides (possibly formed by trapped oxygen molecules on the bentonite or driven by the reduction of H2O) to copper sulfide (Cu2S) identified by X-ray photoelectron spectroscopy (XPS). Overall, these findings shed light on the ideal geochemical conditions that would affect the stability of DGR barriers, emphasizing the impact of the SRB on the corrosion of the metal canisters, the gas generation, and the interaction with components of the bentonite.
published_date 0001-01-01T14:19:16Z
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score 11.012924

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