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Although geotextiles are increasingly employed in environmental engineering works for their hydraulic and mechanical properties, their influence on the flow and transfer of solutes, such as heavy metals, has not been fully investigated. This article considers the transfer of a tracer to characterize the flow, and three heavy metals (zinc, lead and cadmium) in a calcareous soil from a fluvio-glacial deposit with and without geotextiles, under steady state flow and saturated conditions. Leaching column xperiments were conducted. Results showed that in some cases, geotextiles can homogenize the flow and reduce heavy metals elution, while in others, the flow was heterogenized and the heavy metals were more eluted. The influence on both flow and heavy metals elution depends on the injection rate, the initial water content of the geotextile, and its properties (resistance to water penetration).
Transfer, heavy metals, calcareous fluvio-glacial deposit, geotextile, flow
Civil engineer, Ecole Nationale des Travaux Publics de l’Etat, Vaulx-en-Velin,
Research associate, Ecole Nationale des Travaux Publics de l’Etat, Vaulx-en-Velin,
Associate Professor, Environmental laboratory, Department of Civil Engineering, Faculty of Sciences and Engineering, Laval University, Sainte Foy, Quebec