1. Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, Sichuan, China
2. Research Center for Rural Energy and Ecology, Chinese Academy of Agricultural Sciences, Chengdu 610041, Sichuan, China
3. Agro-Environmental Protection Institute, Chinese Academy of Agricultural Sciences, No. 31, Fukang Road, Nankai District, Tianjin 300191, China
4. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
5. Zhai Mingguo Academician Work Station, Sanya University, Sanya 572022, China
6. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China