The effect of compaction and microbial activity on the quantity and release rate of water-soluble organic matter from bentonites

Maanoja, Susanna T; Palmroth, Marja R.T.; Salminen, Linda; Lehtinen, Leena; Kokko, Marika; Lakaniemi, Aino–Maija; Auvinen, Hannele; Kiczka, Mirjam; Muuri, Eveliina; Rintala, Jukka

doi:10.1016/j.clay.2021.106192

Cited by 13 publications

(2 citation statements)

References 30 publications

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“…Therefore, a continuous evaluation of microbial activity and diversity in such a challenging environment is essential for the safety assessments of the DGR concept. In recent years, numerous studies have investigated the behavior of allochthonous bacteria in highly compacted bentonite (Figure 1), as well as the cultivation of microbes derived from the bentonite itself [6,64,74,75]. For instance, Jalique et al [76] identified Gram-positive spore-forming bacteria in highly compacted bentonite and inferred that the formation of spores might enhance bacterial survival in the challenging conditions of this environment.…”

Section: Effect Of Bentonite Dry Density and Microbial Activity On Be...mentioning

confidence: 99%

Insights into the Impact of Physicochemical and Microbiological Parameters on the Safety Performance of Deep Geological Repositories

Morales-Hidalgo,

Povedano-Priego,

Martinez-Moreno

et al. 2024

Microorganisms

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Currently, the production of radioactive waste from nuclear industries is increasing, leading to the development of reliable containment strategies. The deep geological repository (DGR) concept has emerged as a suitable storage solution, involving the underground emplacement of nuclear waste within stable geological formations. Bentonite clay, known for its exceptional properties, serves as a critical artificial barrier in the DGR system. Recent studies have suggested the stability of bentonite within DGR relevant conditions, indicating its potential to enhance the long-term safety performance of the repository. On the other hand, due to its high resistance to corrosion, copper is one of the most studied reference materials for canisters. This review provides a comprehensive perspective on the influence of nuclear waste conditions on the characteristics and properties of DGR engineered barriers. This paper outlines how evolving physico-chemical parameters (e.g., temperature, radiation) in a nuclear repository may impact these barriers over the lifespan of a repository and emphasizes the significance of understanding the impact of microbial processes, especially in the event of radionuclide leakage (e.g., U, Se) or canister corrosion. Therefore, this review aims to address the long-term safety of future DGRs, which is critical given the complexity of such future systems.

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Section: Effect Of Bentonite Dry Density and Microbial Activity On Be...mentioning

confidence: 99%

Insights into the Impact of Physicochemical and Microbiological Parameters on the Safety Performance of Deep Geological Repositories

Morales-Hidalgo,

Povedano-Priego,

Martinez-Moreno

et al. 2024

Microorganisms

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show abstract

“…Bentonites are mudstones consisting mainly of smectites, particularly montmorillonite, which is a hydrated aluminosilicate with a layered structure [ 19 ]. Their characteristic features include their substantial specific surface area and their tendency to adsorb water in interstitial spaces, as a result of which, bentonite has the greatest tendency to swell of all clay minerals (water absorption 300–700%) [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Bentonite as a Functional Material Enhancing Phytostabilization of Post-Industrial Contaminated Soils with Heavy Metals

et al. 2022

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Growing awareness of the risks posed by pollution of the soil environment is leading to the development of new remediation strategies. The technique of aided phytostabilization, which involves the evaluation of new heavy-metal (HM)-immobilizing amendments, together with appropriately selected plant species, is a challenge for environmental protection and remediation of the soil environment, and seems to be promising. In this study, the suitability of bentonite for the technique of aided phytostabilization of soils contaminated with high HM concentrations was determined, using a mixture of two grass species. The HM contents in the tested plants and in the soil were determined by flame atomic absorption spectrometry. The application of bentonite had a positive effect on the biomass of the tested plants, and resulted in an increase in soil pH. The concentrations of copper, nickel, cadmium, lead and chromium were higher in the roots than in the above-ground parts of the plants, especially when bentonite was applied to the soil. The addition of the analyzed soil additive contributed significantly to a decrease in the levels of zinc, copper, cadmium and nickel in the soil at the end of the experiment. In view of the above, it can be concluded that the use of bentonite in the aided phytostabilization of soils polluted with HMs, is appropriate.

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3D modelling of long-term sulfide corrosion of copper canisters in a spent nuclear fuel repository

Pękała

Alt‐Epping

et al. 2022

Applied Geochemistry

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The effect of compaction and microbial activity on the quantity and release rate of water-soluble organic matter from bentonites

Cited by 13 publications

References 30 publications

Insights into the Impact of Physicochemical and Microbiological Parameters on the Safety Performance of Deep Geological Repositories

Insights into the Impact of Physicochemical and Microbiological Parameters on the Safety Performance of Deep Geological Repositories

Bentonite as a Functional Material Enhancing Phytostabilization of Post-Industrial Contaminated Soils with Heavy Metals

3D modelling of long-term sulfide corrosion of copper canisters in a spent nuclear fuel repository

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