1. Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, P. R. China
2. Biogas Institute of Ministry of Agriculture, Chengdu 610041, P. R. China
3. Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, P. R. China
4. National Engineering Research Center for Flue Gas Desulfurization, Sichuan University, Chengdu 610065, P. R. China
5. Institute of Environmental Engineering, RWTH Aachen University, Aachen 52056, Germany
6. SCIEX Analytical Instrument Trading Co., Shanghai, 200335, P. R. China