Geochemical, geotechnical and microbiological changes in mg/ca bentonite after thermal loading at 150 °C

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F21%3AA2202AQ8" target="_blank" >RIV/61988987:17310/21:A2202AQ8 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61388980:_____/21:00545541 RIV/46747885:24620/21:00008965 RIV/26722445:_____/21:N0000027 RIV/68407700:21110/21:00351531

Výsledek na webu

<a href="https://www.scopus.com/record/display.uri?eid=2-s2.0-85114265210&origin=resultslist#abstract" target="_blank" >https://www.scopus.com/record/display.uri?eid=2-s2.0-85114265210&origin=resultslist#abstract</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/min11090965" target="_blank" >10.3390/min11090965</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Geochemical, geotechnical and microbiological changes in mg/ca bentonite after thermal loading at 150 °C

Popis výsledku v původním jazyce

Bentonite buffers at temperatures beyond 100 °C could reduce the amount of high-level radioactive waste in a deep geological repository. However, it is necessary to demonstrate that the buffer surrounding the canisters withstands such elevated temperatures, while maintaining its safety functions (regarding long-term performance). For this reason, an experiment with thermal loading of bentonite powder at 150 °C was arranged. The paper presents changes that the Czech Mg/Ca bentonite underwent during heating for one year. These changes were examined by X-ray diffraction (XRD), thermal analysis with evolved gas analysis (TA-EGA), aqueous leachates, Cs sorption, cation exchange capacity (CEC), specific surface area (SSA), free swelling, saturated hydraulic conductivity, water retention curves (WRC), quantitative polymerase chain reaction (qPCR), and next-generation sequencing (NGS). It was concluded that montmorillonite was partially altered, in terms of the magnitude of the surface charge density of montmorillonite particles, based on the measurement interpretations of CEC, SSA, and Cs sorption. Montmorillonite alteration towards low-or non-swelling clay structures corresponded well to significantly lower swelling ability and water uptake ability, and higher saturated hydraulic conductivity of thermally loaded samples. Microbial survivability decreased with the thermal loading time, but it was not completely diminished, even in samples heated for one year.

Název v anglickém jazyce

Geochemical, geotechnical and microbiological changes in mg/ca bentonite after thermal loading at 150 °C

Popis výsledku anglicky

Bentonite buffers at temperatures beyond 100 °C could reduce the amount of high-level radioactive waste in a deep geological repository. However, it is necessary to demonstrate that the buffer surrounding the canisters withstands such elevated temperatures, while maintaining its safety functions (regarding long-term performance). For this reason, an experiment with thermal loading of bentonite powder at 150 °C was arranged. The paper presents changes that the Czech Mg/Ca bentonite underwent during heating for one year. These changes were examined by X-ray diffraction (XRD), thermal analysis with evolved gas analysis (TA-EGA), aqueous leachates, Cs sorption, cation exchange capacity (CEC), specific surface area (SSA), free swelling, saturated hydraulic conductivity, water retention curves (WRC), quantitative polymerase chain reaction (qPCR), and next-generation sequencing (NGS). It was concluded that montmorillonite was partially altered, in terms of the magnitude of the surface charge density of montmorillonite particles, based on the measurement interpretations of CEC, SSA, and Cs sorption. Montmorillonite alteration towards low-or non-swelling clay structures corresponded well to significantly lower swelling ability and water uptake ability, and higher saturated hydraulic conductivity of thermally loaded samples. Microbial survivability decreased with the thermal loading time, but it was not completely diminished, even in samples heated for one year.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

10400 - Chemical sciences

Projekt

<a href="/cs/project/TK02010169" target="_blank" >TK02010169: Limitní faktory pro přežití a proliferaci mikrobiálních společenstev, významných pro korozi bariér hlubinného úložiště radioaktivních odpadů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Minerals

ISSN

2075-163X

e-ISSN

2075-163X

Svazek periodika

11

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

21

Strana od-do

965

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85114265210