1. Faculteit Industriële Ingenieurswetenschappen, KU Leuven, Campus Groep T Leuven, Andreas Vesaliusstraat 13, B-3000 Leuven, Belgium
2. Institute of Chemical Engineering and Technology, Poznan University of Technology, Pl. M. Skłodowskiej-Curie 2, 60-965 Poznan, Poland
3. Institute for Water Education, Department of Environmental Engineering and Water Technology, UNESCO-IHE, P. O. Box 3015, 2601 DA Delft, The Netherlands