Your browser doesn't support javascript.
loading
Effect of compaction on bisulfide diffusive transport through MX-80 bentonite.
Chowdhury, F; Rashwan, T L; Mondal, P; Behazin, M; Keech, P G; Sharma, J S; Krol, M.
Afiliación
  • Chowdhury F; Department of Civil Engineering, Lassonde School of Engineering, York University, Canada.
  • Rashwan TL; Department of Civil Engineering, Lassonde School of Engineering, York University, Canada; School of Engineering and Innovation, The Open University, UK.
  • Mondal P; Department of Civil Engineering, Lassonde School of Engineering, York University, Canada.
  • Behazin M; Nuclear Waste Management Organization, Canada.
  • Keech PG; Nuclear Waste Management Organization, Canada.
  • Sharma JS; Department of Civil Engineering, Lassonde School of Engineering, York University, Canada.
  • Krol M; Department of Civil Engineering, Lassonde School of Engineering, York University, Canada. Electronic address: magdalena.krol@lassonde.yorku.ca.
J Contam Hydrol ; 264: 104341, 2024 May.
Article en En | MEDLINE | ID: mdl-38701693
ABSTRACT
Canada's deep geological repository (DGR) design includes an engineered barrier system where highly compacted bentonite (HCB) surrounds the copper-coated used fuel containers (UFCs). Microbial-influenced corrosion is a potential threat to long-term integrity of UFC as bisulfide (HS-) may be produced by microbial activities under anaerobic conditions and transported via diffusion through the HCB to reach the UFC surface, resulting in corrosion of copper. Therefore, understanding HS- transport mechanisms through HCB is critical for accurate prediction of copper corrosion allowance. This study investigated HS- transport behaviour through MX-80 bentonite at dry densities 1070-1615 kg m-3 by performing through-diffusion experiments. Following HS- diffusion, bromide (Br-) diffusion and Raman spectroscopy analyses were performed to explore possible physical or mineralogical alterations of bentonite caused by interacting with HS-. In addition, accessible porosity ε was estimated using extended Archie's law. Effective diffusion coefficient of HS- was found 2.5 × 10-12 m2 s-1 and 5.0× 10-12 m2 s-1 for dry densities 1330 and 1070 kg m-3, respectively. No HS- breakthrough was observed for highly compacted bentonite (1535-1615 kg m-3) over the experimental timeframe (170 days). Raman spectroscopy results revealed that HS- reacted with iron in bentonite and precipitated as mackinawite and, therefore, it was immobilized. Finally, results of this study imply that HS- transport towards UFC will be highly controlled by the available iron content and dry density of the buffer material.
Asunto(s)
Palabras clave
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Sulfuros / Bentonita Idioma: En Revista: J Contam Hydrol Asunto de la revista: TOXICOLOGIA Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Sulfuros / Bentonita Idioma: En Revista: J Contam Hydrol Asunto de la revista: TOXICOLOGIA Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Países Bajos