Volatile fatty acids (VFAs) production from waste-activated sludge affected by ultrasonic pretreatment
The effect of ultrasonic energy density from 0 to 4.0 kW/L on the hydrolysis and acidification of waste activated sludge (WAS) at pH 10.0 was investigated in this study. Experimental results showed that ultrasonic pretreatment caused significant enhancements of WAS hydrolysis and VFA accumulation. The study of ultrasonic energy density effect revealed that energy density influenced not only the total VFA accumulation but also the percentage of individual VFA. The maximal VFA accumulation occurred at ultrasonic energy density of 1.0 kW/L and fermentation time of 72 h, which was more than two times that without ultrasonic treatment. The analysis of VFA composition showed that the percentage of acetic acid ranked the first (more than 40％) and those of iso-valeric and propionic acids located at the second and third places, respectively. Thus, the suitable ultrasonic conditions for VFA accumulation from WAS were ultrasonic energy density of 1.0 kW/L and fermentation time of 72 h.
Sludge Volatile fatty acids (VFAs) Ultrasonic pH Enzyme activity
Yan Yuanyuan Qi Zhou
State key laboratory of pollution control and Resources reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road,Shanghai 200092, China
国际会议
天津
英文
319-324
2011-11-12（万方平台首次上网日期，不代表论文的发表时间）