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Is it possible to fully predict removal performances of a nanofiltration process by transport modeling?
4th World Congress and Expo on Recycling
July 27-29, 2017 | Rome, Italy

Deon Sebastien

Université de Bourgogne-Franche-Comté, France

Keynote: Int J Waste Resour


Nanofiltration can find applications in several environmental or industrial fields since its size and electrical properties make it perfectly suitable to remove small charged pollutants, such as metal ions, from contaminated effluents. In this context, a predictive tool could be a very useful for process development or optimization. Several approaches are available in literature but the coupling between equilibrium partitioning at the interfaces and the extended Nernst-Planck equation to describe transport within the pores is probably the most convenient approach to model multi-ionic separation. The major limitation for such a predictive model lies in the estimation of physical parameters. In this presentation, several ways developed to determine the input parameters are discussed to check if a fully predictive model is potentially achievable or if it remains a fanciful dream. The presentation will be mainly devoted to estimation of the membrane charge density (Xd) and the dielectric constant of the solution within pores (εp), which are the two key parameters of the above-mentioned approach. Firstly, the outstanding predictions of filtration performances obtained with an original numerical procedure based on the simultaneous fitting of multi-component rejection curves will be highlighted. Then, various experimental methods developed recently to determine these physical parameters, such as streaming or membrane potential measurements or electrochemical impedance spectroscopy, will be also presented before discussing their respective advantages and drawbacks for predictive purposes.

Biography :

Déon Sébastien obtained his PhD degree from the University of South Brittany in 2007 on the modeling of transport through nanofiltration membranes. In 2008, he became Assistant Professor at the University of Franche-Comté where he has broadened his areas of expertise to electro-kinetic characterizations of membrane materials and fouling cakes. Currently, he is Associate Professor and his skills are mainly dedicated to water treatment by membrane processes. He is also the author or coauthor of one book, has 26 publications in international recognized journals, and some 20 presentations in international conferences. His expertise in reviewing scientific papers led him to become Associate Editor of International Journal of Membrane Science & Technology, Academic Editor of International Journal of Chemical Engineering and an Editorial Board Member of four other peer-reviewed journals.