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Etude des phénomènes de transfert de métaux lourds dans une smectite.

Abstract : Expansive compacted clays are often used as engineered barriers for domestic waste disposals. They must prove their efficiency in terms of pollutant retention while French law concerning maximum allowed permeability has to be achieved. In order to examine the problem related to the prediction of the long term behaviour of such materials, two kinds of analysis were successively performed i) soaking experiments at constant pressure with pollutant model solution (copper nitratel were performed in order to determine mass transfer parameters under polluted conditions, ii) finite element analysis of mass transfer to predict saturation time of a medium, already polluted, with different concentration of copper nitrates solutions. The experimental results, obtained with the Fo-Ca clay, showed that a cationic exchange has occurred, inducing changes in microstructure, in porous phase volume and in macroscopic behaviour. Therefore, even for high pollutant concentration, the swelling potentiel of Fo-Ca was not fully inhibited. The water soaking simulations through a swelling clay medium, pointed out the strong decrease of the saturation time near the clay barrier.
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Contributor : Nathalie Pothier <>
Submitted on : Thursday, June 24, 2021 - 3:47:19 PM
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C. Pothier, Agnès Jullien, Chantal Proust, Patrick Lecomte. Etude des phénomènes de transfert de métaux lourds dans une smectite.. Revue française de Géotechnique, 2003, 103, pp.33-42. ⟨hal-00091124⟩

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