Water Supply Vol 2 No 5-6 pp 277–283 © IWA Publishing 2002
Direct capillary nanofiltration for ground water and surface water treatment
J.Q.J.C. Verberk*, J. Post**, W.G.J. van der Meer*** and J.C. van Dijk****
*Department of Civil Engineering and Geosciences, Delft University of Technology, PO Box 5048, 2600 GA Delft, The Netherlands (E-mail: j.q.j.c.verberk@citg.tudelft.nl). Corresponding author
**DHV Water, PO BOX 484, 3800 AL Amersfoort, the Netherlands (E-mail: jan.post@dhv.nl)
***Nuon Water, PO BOX 400, 8901 BE Leeuwarden, The Netherlands (E-mail: walter.van.der.meer@nuon.com)
****Department of Civil Engineering and Geosciences, Delft University of Technology, PO Box 5048, 2600 GA Delft, The Netherlands
ABSTRACT
Capillary nanofiltration is a new concept in membrane filtration. This technique combines the advantages of the good water quality obtained from nanofiltration membranes with the easy hydraulic cleaning of capillary membranes. Direct capillary nanofiltration can be used to treat ground water or surface water without pre-treatment. At the Delft University of Technology several MSc-thesis projects have been carried out on this subject. This paper will describe some results of these studies. A model based on a mass balance to predict the flux of a capillary nanofiltration installation treating groundwater is proposed. In this model the only resistance taken into account is the concentration polarisation. Also a model to predict the flux when treating surface water has been developed. This model takes into account the resistance due to cake filtration.
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