1. State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, P.R. China
2. Institute of Environmental Engineering, RWTH Aachen University, Aachen D-52074, Germany
3. Sustainability Division, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, POB 5825, Doha, Qatar
4. Faculty of Engineering, University of Technology Sydney, P.O. Box 123, Broadway, Sydney, NSW 2007, Australia