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Dramatic loss of microbial viability in bentonite exposed to heat and gamma radiation: implications for deep geological repository.
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- Additional Information
- Source:
Publisher: Springer Country of Publication: Germany NLM ID: 9012472 Publication Model: Electronic Cited Medium: Internet ISSN: 1573-0972 (Electronic) Linking ISSN: 09593993 NLM ISO Abbreviation: World J Microbiol Biotechnol Subsets: MEDLINE
- Publication Information:
Publication: 2005- : Berlin : Springer
Original Publication: Oxford, OX, UK : Published by Rapid Communications of Oxford Ltd in association with UNESCO and in collaboration with the International Union of Microbiological Societies, c1990-
- Subject Terms:
- Abstract:
Bentonite is an integral part of the engineered barrier system (EBS) in deep geological repositories (DGR) for nuclear waste, but its indigenous microorganisms may jeopardize long-term EBS integrity. To predict microbial activity in DGRs, it is essential to understand microbial reactions to the early hot phase of DGR evolution. Two bentonites (BCV and MX-80) with varied bentonite/water ratios and saturation levels (compacted to 1600 kg.m - 3 dry density/powder/suspension), were subjected to heat (90-150 °C) and irradiation (0.4 Gy.h - 1 ) in the long-term experiments (up to 18 months). Molecular-genetic, microscopic, and cultivation-based techniques assessed microbial survivability. Exposure to 90 °C and 150 °C notably diminished microbial viability, irrespective of bentonite form, with negligible impacts from irradiation or sample type compared to temperature. Bentonite powder samples exhibited microbial recovery after 90 °C heating for up to 6 months but not 12 months in most cases; exposure to 150 °C had an even stronger effect. Further long-term experiments at additional temperatures combined with the mathematical prediction of temperature evolution in DGR are recommended to validate the possible evolution and spatial distribution of microbially depleted zones in bentonite buffer around the waste canisters and refine predictions of microbial effects over time in the DGR.
(© 2024. The Author(s).)
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- Contributed Indexing:
Keywords: Bentonite buffer; Deep geological repository; Elevated temperature; Extremophiles; Gamma radiation; Microbial limiting factors; Radioactive waste disposal
- Accession Number:
1302-78-9 (Bentonite)
0 (Radioactive Waste)
- Publication Date:
Date Created: 20240711 Date Completed: 20240711 Latest Revision: 20240812
- Publication Date:
20240813
- Accession Number:
PMC11239606
- Accession Number:
10.1007/s11274-024-04069-w
- Accession Number:
38990244
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