Acidification of waste activated sludge during thermophilic anaerobic digestion

摘要：

　　The effects of pH value,temperature,adding ratio of waste activated sludge (WAS) and hydraulic retention time (HRT) on WAS acidification in thermophilie anaerobic digestion system were investigated by batch experiments.The results indicated that the WAS acidification at pH 9.0 was the greatest (VFAs content was about 148mg/L),followed by the pH uncontrolled (105rag/L) and the neutral pH (87rag/L).Compared to the conditions ofpH uncontrolled,the VFAs accumulation was retarded at acidic (pH 3.0 and pH 5.0),neutral (pH 7.0) or strong alkaline pH values (pH 11.0).Optimal temperature ofthermophilic anaerobic digestion on VFAs accumulation was shown to be 60℃ (VFAs content was 148mg/L),better than lower temperature 50℃ (79mg/L) or higher temperature 70℃ (75mg/L).Each adding ratio has its own optimal HRT to producing maximum VFAs.The VFAs accumulation was attained peak value at dosing 12.5% and HRT 8d (about 184mg/L).In conclusion,in order to maximize the accumulation of VFAs for providing more carbon,the optimal operating conditions for WAS thermophilic anaerobic digestion observed in this study was pH 9.0,60℃,adding ratio 12.5% and HRT 8d,revealing that the performance of WAS acidification was sensitive to operating conditions.

关键词： waste activated sludge anaerobic digestion thermophilic VFAs

作者: Xiuyun Sun Wei Wang Can chen Changyin Luo Jiansheng Li Jinyou Shen Lianjun Wang

作者单位: School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Nanjing University of Science and Technology,Nanjing 210094, China

会议类型: 国际会议

会议名称: The Seventh International Conference on Waste Management and Technology(第七届固体废物管理与技术国际会议(ICWMT7))

会议地点: 北京

会议语种:英文

页码: 391-400

在线出版日期: 2012-09-05（万方平台首次上网日期，不代表论文的发表时间）