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Título : A clay permeable reactive barrier to remove Cs-137 from groundwater: Column experiments
Autor : De Pourcq, Katrine
Ayora, Carlos
García-Gutiérrez, Miguel
Missana, Tiziana
Carrera, Jesús
Palabras clave : Cs-137
Permeable reactive barrier
Sorption
Cation exchange
Illite
Remediation
Fecha de publicación : jul-2015
Editorial : ELSEVIER
Citación : K. De Pourcq, C. Ayora, M. García-Gutiérrez, T. Missana, J. Carrera, A clay permeable reactive barrier to remove Cs-137 from groundwater: Column experiments, Journal of Environmental Radioactivity 149 (2015) 36-42.
Resumen : Clay minerals are reputed sorbents for Cs-137 and can be used as a low-permeability material to prevent groundwater flow. Therefore, clay barriers are employed to seal Cs-137 polluted areas and nuclear waste repositories. This work is motivated by cases where groundwater flow cannot be impeded. A permeable and reactive barrier to retain Cs-137 was tested. The trapping mechanism is based on the sorption of cesium on illite-containing clay. The permeability of the reactive material is provided by mixing clay on a matrix of wood shavings. Column tests combined with reactive transport modeling were performed to check both reactivity and permeability. Hydraulic conductivity of the mixture (10 4 m/s) was sufficient to ensure an adequate hydraulic performance of an eventual barrier excavated in most aquifers. A number of column experiments confirmed Cs retention under different flow rates and inflow solutions. A 1D reactive transport model based on a cation-exchange mechanism was built. It was calibrated with batch experiments for high concentrations of NH4þ and Kþ (the main competitors of Cs in the exchange positions). The model predicted satisfactorily the results of the column experiments. Once validated, it was used to investigate the performance and duration of a 2 m thick barrier under different scenarios (flow, clay content, Cs-137 and K concentration).
URI : http://dx.doi.org/10.1016/j.jenvrad.2015.06.029
http://documenta.ciemat.es/handle/123456789/3275
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