[1] Jiangsu Univ, Sch Energy & Power Engn, Zhenjiang 212013, Peoples R China
[2] Minist Agr & Rural Affairs, Biogas Inst, Key Lab Dev & Applicat Rural Renewable Energy, Chengdu 610041, Peoples R China
[3] Chinese Acad Agr Sci, Res Ctr Rural Energy & Ecol, Chengdu 610041, Peoples R China