Affiliation: | 1. Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Scientific Research Institute of the Ministry of Agriculture, Chengdu, P. R. China;2. Key Laboratory of Energy Microbiology, Biogas Scientific Research Institute of the Ministry of Agriculture, Chengdu, P. R. China;3. School of Urban Economics and Public Administration, Capital University of Economics and Business, Beijing, P. R. China;4. Research Center of Water Pollution Control Technologies, Chinese Research Academy of Environmental Sciences, Beijing, P. R. China;5. Jiangsu Key Laboratory for Biomass‐based Energy and Enzyme Technology, Huaiyin Normal University, Huaiyin, P. R. China |