Kinetic analysis of waste activated sludge hydrolysis and short-chain fatty acids production at pH 1

• 作 者: FENG Leiyu YAN Yuanyuan CHEN Y
• 机 构: State key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and E
• 出 处: 环境科学学报（英文版）
• 发表日期: 2009年5期
• 关键词: waste activated sludge (WAS) hydrolysis short-chain fatty acids (SCFAs) kinetics

The accumulation of short-chain fatty acids (SCFAs), a preferred carbon source for enhanced biological phosphorus removal microbes, was significantly improved when waste activated sludge (WAS) was fermented at pH 10. The kinetics of WAS hydrolysis and SCFAs production at pH 10 were investigated. It was observed that during WAS anaerobic fermentation at pH 10 the accumulation of SCFAs was limited by the hydrolysis process, and both the hydrolysis of WAS particulate COD and the accumulation of SCFAs followed first-order kinetics. The hydrolysis and SCFAs accumulation rate constants increased with a increasing of temperature from 10 to 35℃, which could be described by the Arrhenius equation. The kinetic data further indicated that SCFAs production at pH 10 was a biological process. Compared with the experiment of pH uncontrolled (blank test), both the rate constants of WAS hydrolysis and SCFAs accumulation at 20℃ were significantly improved when WAS was fermented at pH 10.