october, 2019

22oct14 h 00 min18 h 00 minSoutenance de thèse Flavie Prézélus


Event Details

“L’écoconception de membranes d’ultrafiltration pour la potabilisation de l’eau : modélisation et approche expérimentale”.

La soutenance aura lieu le mardi 22 octobre à 14h dans l’Amphi 2 de la Maison de la Valorisation et de la Recherche (MRV)

Jury :
Denis BOUYER – Université de Montpellier (Rapporteur)
Geneviève GÉSAN-GUIZIOU – Agrocampus Ouest (Rapportrice)
Denis ROIZARD – Université de Lorraine (Examinateur)
Benoît TEYCHENÉ – Université de Poitiers (Examinateur)
Patrick SAUVADE – Suez (Membre invité)
Jean-Christophe REMIGY – Université Toulouse III Paul Sabatier (Directeur de thèse)
Ligia BARNA – INSA Toulouse (Co-directrice de thèse)
Christelle GUIGUI – INSA Toulouse (Co-encadrante de thèse)


ABSTRACT Although ultrafiltration treatment processes are widely used for drinking water applications, their environmental performances remain poorly understood. The objectives of this work are to provide understanding of membrane environmental footprint, as well as to suggest and implement relevant innovative solutions for its mitigation. A multiphase ecodesign approach is applied to hollow fibres fabricated by phase inversion and operated in a dead-end mode. The two developed parameterized models evaluate environmental impacts during fabrication and operation as a function of operating conditions. The subsequent Life Cycle Assessment highlights glycerol-related operating conditions as interesting action levers for environmental mitigation of membrane fabrication. However, membrane operation accounts for nearly exclusively all environmental impacts, with electricity production and sodium hypochlorite fabrication as the two main contributors. The analysis also pinpoints the influence of filtration flux. Since opportunities for biosourced solvents exist, substitution of petrochemical solvents during membrane fabrication is chosen as an improvement strategy. A metrics-based methodological framework is suggested to rationalize sustainable membrane fabrication. Biosourced flat membranes using methyl lactate as a solvent have thus been prepared. The mixed environmental scores do not preclude solvent substitution as a relevant improvement strategy. Results highlight the feasibility and relevance of such an ecodesign approach based on process modelling and experimental work, and lay the foundations for further development. Keywords: Process modelling − Life cycle assessment (LCA) – Ecodesign – Phase inversion − Membrane filtration − Drinking water treatment


(Tuesday) 14 h 00 min - 18 h 00 min


Amphi 2 de la Maison de la Valorisation et de la Recherche (MRV)