1. College of Environmental Science and Engineering, Nankai University, No. 38, Tongyan Road, Jinnan District, Tianjin 300350, China
2. Graduate School of Environmental Studies, Tohoku University, Aramaki Aza Aoba 468-1, Aoba, Sendai 980-8572, Japan
3. National-Local Joint Engineering Research Center of Biomass Resource Utilization, Nankai University, No. 38, Tongyan Road, Jinnan District, Tianjin 300350, China