Formation et résistance au transfert d'un dépôt de colloïdes sur une membrane d'ultrafiltration

Abstract : The aim of this work is the study of the influence of the properties of a colloidal suspension on tangential flow ultrafiltration. Experiments, described in the first chapter, have been performed with a colloidal suspension of clay in the presence of electrolytes. Properties of such a suspension are presented in the second part where the suspension stability is considered as a consequence of electrostatic interaction as in the DLVO theory. The third chapter describes the effect of the suspension stability on ultrafiltration. Models predicts the influence of electrostatic interactions on transfer mechanisms controlling filtration : cake formation and hydraulic resistivity of the cake. Results of lux recovery after ultrafiltration are mentionned in the next section. Investigation of salt rejection by the cake layer is the subject of the last chapter. Such phenomenon is described as electrostatic repulsion of ions by charged surface of the colloid. In conclusion, this thesis is an overview of the influence of suspension stability or of the electrostatic interactions on the transfer mechanisms occuring during cross flow filtration of colloids.
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Patrice Bacchin. Formation et résistance au transfert d'un dépôt de colloïdes sur une membrane d'ultrafiltration. Génie des procédés. Université Paul Sabatier - Toulouse III, 1994. Français. ⟨tel-00143594⟩

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