1. School of Environment, Tsinghua University, Beijing 100084, China
2. Department of Chemical and Biochemical Engineering, Western University, London, Ontario N6A 5B9, Canada
3. School of Environmental and Ecology, Chongqing University, Chongqing 400044, China
4. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
5. USP Technologies, 3020 Gore Road, London, Ontario N5 V4T7, Canada