1. Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, 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. Waternet, Department Research & Innovation, P.O. Box 94370, 1090 GJ Amsterdam, The Netherlands
4. University of Chinese Academy of Sciences, Beijing 100049, P. R. China