1. School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, P. R. China
2. Department of Mechanical Engineering, 10-367 Donadeo Innovation Center for Engineering, Advanced Water Research Lab (AWRL), University of Alberta, Edmonton, AB T6G 1H9, Canada
3. Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada