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Membrane Water Treatment
  Volume 4, Number 3, July 2013 , pages 157-174

A new method for in line electrokinetic characterization of cakes
Yannick Lanteri, Wael Ballout, Patrick Fievet, Sebastien Deon, Anthony Szymczyk and Patrick Sauvade

    The present study is devoted to the validation of a new method for in line electrokinetic characterisation of deposits on membrane surfaces. This method is based upon simultaneous measurements of transversal streaming potential and permeates flux at constant pressure before and during the deposit formation. Dead-end filtration experiments were conducted with negative flat membranes forming a narrow slit channel, negative hollow fiber membranes and mono-dispersed suspensions of (negatively charged) polystyrene latex and (positively charged) melamine particles at various concentrations. It was observed that the overall streaming potential coefficient increased in absolute value with the deposited latex quantity, whereas it decreased and changed of sign during the filtration of melamine suspensions. By considering a resistance-in-series model, the streaming potential coefficient of the single deposit (SPd) was deduced from the electrokinetic and hydraulic measurements. The independence of SPd with respect to growth kinetics validates the measurement method and the reliability of the proposed procedure for calculating SPd. It was found that SPd levelled off much more quickly when filtration was performed through the slit channel. This different behaviour could result from a non-uniform distribution of the deposit thickness along the membrane given that the position of measuring electrodes is different between the two cells.
Key Words
    electrokinetics; streaming potential; particles; latex; melamine; cakes; fouling; dead-end filtration; hollow fibers
1 Yannick Lanteri: Institut Europeen des Membranes, 34095 Montpellier cedex 5, France;
2 Wael Ballout, Patrick Fievet, Sebastien Deon: Institut UTINAM, Universite de Franche-Comte, 25030 Besancon cedex, France;
3 Anthony Szymczyk: Universite de Rennes 1, Institut des Sciences Chimiques de Rennes, 35042 France;
4 Patrick Sauvade: Degremont Technologie - AQUASOURCE, 31029 Toulouse, France

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