1. Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, 100085 Beijing, P. R. China
2. Section of Sanitary Engineering, Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
3. University of Chinese Academy of Sciences, 100049 Beijing, P. R. China
4. Waternet, Department Research & Innovation, P.O. Box 94370, 1090 GJ Amsterdam, The Netherlands