Title: The performance of natural clay as a barrier to the diffusion of municipal solid waste landfill leachates
Authors: Cuevas, Jaime ×
Ruiz, Ana I
de Soto, Isabel S
Sevilla, Teresa
Procopio, Jesus R
Da Silva, Pilar
Jesus Gismera, Ma
Regadío, Mercedes
Sanchez Jimenez, Nicanor
Rodriguez Rastrero, Manuel
Leguey, Santiago #
Issue Date: 2012
Series Title: Journal of Environmental Management vol:95 pages:S175-S181
Abstract: In this paper, the diffusion of solutes in natural clay from a concentrated solution consisting primarily of ammonium, sodium and chloride ions at a pH level of 8 was studied and was based on an existing 20-year-old landfill. Contaminant transport through clay liners was predicted using transport and reaction geochemical codes to help explain the experimental data. The model predicted the chloride anion diffusion and cation exchange processes for three different experiments: (1) small-scale interactions in compacted clay, (2) 1:1 European Union (EU) Directive demonstration experiments (0.5-m-thick clay barrier), and (3) analysis of a bore hole with core recovery drilled in an old landfill located above a similar type of clay as that studied in (1) and (2). Orders of magnitude between 10(-10) and 10(-9) m(2) s(-1) were used for the apparent diffusion coefficient to fit the chloride profiles at the different scales; however, at larger space and time scales, diffusion was retarded due to the presence of more consolidated, non-mechanically disturbed clay materials at large depths in a natural clay-rock emplacement.
ISSN: 0301-4797
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

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