1. Faculty of Science and Technology, Membrane Science and Technology, MESA + Institute of Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands, Tel. ; Fax:
2. Wetsus, Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900 CC Leeuwarden, The Netherlands
3. Faculty of Agricultural Technology, Division of Bioprocess Engineering, Department of Agricultural Engineering, University of Brawijaya, Malang 65145, Indonesia
4. KWR Watercycle Research Institute, P.O. Box 1072, 3430 BB Nieuwegein, The Netherlands