Bentonite sterilization methods in relation to geological disposal of radioactive waste: comparative efficiency of dry heat and gamma radiation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24620%2F25%3A00014388" target="_blank" >RIV/46747885:24620/25:00014388 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21340/25:00382458 RIV/46356088:_____/25:N0000008

Result on the web

<a href="https://onlinelibrary.wiley.com/doi/abs/10.1111/1758-2229.70047" target="_blank" >https://onlinelibrary.wiley.com/doi/abs/10.1111/1758-2229.70047</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/jambio/lxaf051" target="_blank" >10.1093/jambio/lxaf051</a>

Result language

angličtina

Original language name

Bentonite sterilization methods in relation to geological disposal of radioactive waste: comparative efficiency of dry heat and gamma radiation

Original language description

Aims: This study evaluates the effectiveness of two standard sterilization methods on microorganisms in bentonite, which is proposed as a buffer around metal canisters containing long-lived radioactive waste. Bentonite, as a natural clay, contains microorganisms with enhanced resistance to harsh conditions and the ability to reactivate upon decompaction. Sterile controls are crucial in experiments estimating the impact of microorganisms on nuclear waste repositories. Yet, the effectiveness of common sterilization methods on bentonite microorganisms has not been fully evaluated. Methods and results: Two methods were compared: dry heat (nine cycles at 121◦C for 4 h) and gamma irradiation (10–140 kGy at 147 Gy·min−1). Molecular-genetic, microscopic, and cultivation techniques were used to assess sterilization. Heat sterilization did not eliminate heat-resistant microorganisms, such as Bacillus, Paenibacillus, and Terribacillus, from bentonite powder even after nine heat cycles. However, bentonite suspended in deionized water was sterile after four heat cycles. In contrast, gamma irradiation effectively reduced microbial survivability above a dose of 10 kGy, with the highest doses (100–140 kGy) potentially degrading DNA. Conclusions: Gamma irradiation at 30 kGy effectively sterilized bentonite powder. The findings of our experiments emphasize the importance of using appropriate sterilization methods to maintain sterile controls in experiments that evaluate the microbial impacts in nuclear waste repositories. However, further assessment is needed to determine the effects of potential alterations induced by gamma radiation on bentonite properties.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10606 - Microbiology

Project

<a href="/en/project/TK02010169" target="_blank" >TK02010169: Limiting Factors for Survivability and Proliferation of Microorganisms Significant for Corrosion of Deep Geological Repository Barrier Systems</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Applied Microbiology>

ISSN

1364-5072

e-ISSN

—

Volume of the periodical

136

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

—

UT code for WoS article

001445890800001

EID of the result in the Scopus database

2-s2.0-105000323582