1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China
2. School of Environment, Harbin Institute of Technology, Harbin 150090, PR China
3. College of Urban and Environmental Sciences, Peking University, Beijing 100091, PR China
4. Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109-2092 United States
5. School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, PR China