1. School of Environment, Tsinghua University, 30 Shuangqing Road, Beijing 100084, China
2. Beijing Engineering Research Center of Biogas Centralized Utilization, 30 Shuangqing Road, Beijing 100084, China
3. Shanghai Cooperative Centre for WEEE Recycling, Shanghai Second Polytechnic University, 2360 Jinhai Road, Shanghai 201209, China
4. Institute of Biological and Environmental Engineering, Hunan Academy of Forestry, 658 Shaoshan South Road, Changsha 410004, China
5. Centre for Resource and Environmental Research, Beijing University of Chemical Technology, 15 North Third Ring Road, Beijing 100029, China