1. Wetsus, European Centre of Excellence for Sustainable Water Technology, Post Office Box 1113, 8900 CC Leeuwarden, Netherlands
2. Department of Chemical Engineering, Faculty of Engineering of the University of Porto (FEUP), Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
3. Sub-department of Environmental Technology, Wageningen University, Post Office
Box 17, 6700 AA Wageningen, Netherlands