ArticleACS omega2025
Microbially-Induced Carbonate Precipitation in Low pH Cement; Potential for Self-Healing in Radioactive Waste Geodisposal Systems.
Article in ACS omega, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
7 authors.
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Abstract
In a geological disposal facility for radioactive waste, groundwater interacts with engineered cement barriers used for waste encapsulation, as a backfill material, and for construction purposes. This study investigates microbial interactions with low-pH cement (pH 10.5 and 11) in synthetic groundwater under anoxic conditions. Microcosm experiments used alkaliphilic microbes obtained from a high-pH lime kiln site. These were incubated with low-pH cement tablets in synthetic Oxford clay porewater with varying levels of electron donors (lactate or hydrogen) or electron acceptors (nitrate). In higher-carbon systems supplemented with lactate, reduction of nitrate was noted over six months, decreasing pH (10.0 to 8.8), presumably due to carbonic acid production. Calcium concentrations also dropped (9.2 to 4.7 mM). SEM-EDS and μ-XCT analyses confirmed that calcium carbonate precipitates had healed cracks and reduced porosity in the cement tablets. However, in the low-carbon system, microbial activity was minimal, leading to smaller pH changes (from 10.0 to 9.4) and greater leaching of Ca
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