Impact of Oxygen Release from Bentonite on Microbial Activity, Mineralogy, and Steel Corrosion.

ABSTRACT: Deep geological repositories for the disposal of radioactive waste rely partly on the integrity of canisters and on the inhibition of microbial growth by the bentonite barrier for the effective isolation of the waste from the environment. Canister integrity can be compromised by the activity of sulfate-reducing bacteria (SRB) and by abiotic corrosion. Unexpected aerobic microbial growth and SRB inhibition under anoxic conditions were observed in bentonite during a recent long-term in situ experiment, which raised the possibility that residual O₂ may delay anaerobic growth. Here, to investigate the role of O₂, bentonite was equilibrated with 0, 21, or 100% O₂, compacted to 1.25 g/cm³, and deployed in a borehole for 1.5 years. Analyses revea

SUBMITTER: Jakus N 

PROVIDER: S-EPMC12676745 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature