1. a Centre for Studies in Energy and Environment , University of Regina , Regina , Saskatchewan , Canada
2. b Environmental Systems Engineering Program, Faculty of Engineering , University of Regina , Regina , Saskatchewan , Canada
3. c Chinese Research Academy of Environmental Science North China Electric Power University , Beijing , People’s Republic of China
4. d College of Environmental Engineering and Science , Hunan University , Changsha , Hunan , China
5. e Faculty of Engineering , University of Regina , Regina , Canada