1. Department of Water Management, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
2. Strategic Centre, Waternet, Korte Ouderkerkerdijk 7, 1096 AC Amsterdam, The Netherlands
3. Particle and Interface Technology Group, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium
4. Department of Civil & Environmental Engineering, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand