1. Wetsus, Centre of Excellence for Sustainable Water Technology, P.O.
Box 1113, 8900 CC Leeuwarden, The Netherlands
2. Laboratory for Process Equipment, Delft University of Technology, Leeghwaterstraat 44,
2628 CA Delft, The Netherlands
3. Systems & Control Group, Wageningen University, Bornse Weilanden 59, 6708 WG Wageningen, The Netherlands