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    Influence of membrane properties on fouling in submerged membrane bioreactors

    Year: 2010

    Journal: Journal of Membrane Science, Volume 348, Issues 1-2, 15 February 2010, Pages 66-74, 20111221

    Authors: Perry van der Marel a, b, Arie Zwijnenburg b, Antoine Kemperman a, Matthias Wessling a, Hardy Temmink b, c and Walter van der Meera, b

    Organizations: a Membrane Technology Group, IMPACT Institute of Mechanics, Processes and Control Twente, Faculty of Science and Technology, University of Twente, P.O. Box 217, NL-7500 AE Enschede, The Netherlands, b Wetsus, Centre of Excellence for Sustainable Water Technology, P.O. Box 113, NL-8900 CC Leeuwarden, The Netherlands, c Department of Environmental Technology, Wageningen University, P.O. Box 8129, NL-6700 EV Wageningen, The Netherlands

    Polymeric flat-sheet membranes with different properties were used in filtration experiments with activated sludge from a pilot-scale MBR to investigate the influence of membrane pore size, surface porosity, pore morphology, and hydrophobicity on membrane fouling. An improved flux-step method was used to measure both the critical flux and critical flux for irreversibility. Long term experiments were performed to evaluate if influences of membrane properties on short term could be translated to long term fouling behavior.

    The results showed that a hydrophilic asymmetric membrane with an interconnected pore structure, a nominal pore size of 0.3 μm, and large surface porosity of 27%, provided the best membrane performance with respect to critical flux and critical flux for irreversibility. The dominant fouling mechanism in long term filtration experiments was gel layer formation, which for this membrane was the least severe, and therefore extended the sustainable time.