1. Pollution Prevention and Control Care, UNESCO-IHE, P.O. Box 3015, 2601 DA Delft, The Netherlands
2. Department of Water Technology and Environmental Engineering, Institute of Chemical Technology, Technicka 5, 166 28 Prague 6, Czech Republic
3. Sub-department of Environmental Technology, Wageningen University, P.O. Box 8128, 6700 ET Wageningen, The Netherlands and Instituto de la Grasa (C.S.I.C.), Avda. Padre García Tejero 4, 41012 Sevilla, Spain
4. Department of Agrotechnology and Food Sciences, Laboratory of Biophysics and Wageningen NMR Centre, Wageningen University, P.O. Box 8128, 6700 ET Wageningen, The Netherlands