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Theses

Estimation des propriétés électriques/diélectriques et des performances de séparation d'ions métalliques de membranes d'ultrafiltration et/ou de nanofiltration

Abstract : The characterization of electrical and dielectric properties of UF and NF membranes is an essential step to understand their filtration performance. A new approach has been developed to determine the dielectric properties of a NF membrane by impedance spectroscopy. This is based on the isolation of the membrane active layer and the use of mercury as conductive material, which allowed us to prove that the dielectric constant of the solution inside nanopores is lower than that of the external solution. Two cell configurations (fibers immersed in the solution or fibers embedded in an insulating gel) were investigated for the implementation of tangential electrokinetic measurements with hollow fibers and the solution around the fibers was found to influence both streaming current and cell electrical conductance. Moreover, the important contribution of the fiber porous body to the streaming current does not allow the conversion of the latter to luminal zeta potential. The advantageous properties of these membranes were finally used to decontaminate solutions containing metal ions. Decontamination performances in terms of both pollutant retention and ecotoxicological impact were studied on synthetic solutions and a discharge water from surface treatment industry. Although retention performances were remarkable, the toxicity of the real effluent could not be totally annihilated. A thorough study of the retention of non-metallic contaminants is thus required.
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https://tel.archives-ouvertes.fr/tel-01662457
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Submitted on : Wednesday, December 13, 2017 - 10:50:15 AM
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Anthony Efligenir. Estimation des propriétés électriques/diélectriques et des performances de séparation d'ions métalliques de membranes d'ultrafiltration et/ou de nanofiltration. Génie chimique. Université de Franche-Comté, 2015. Français. ⟨NNT : 2015BESA2039⟩. ⟨tel-01662457⟩

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