Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 21, Issue 5, Pages 589-594Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(08)62312-8
Keywords
waste activated sludge; hydrolysis; short-chain fatty acids; kinetics; alkaline pH
Categories
Funding
- Hi-Tech Research and Development Program (863) of China [2007AA06Z326]
- Key Projects of National Water Pollution Control and Management of China [2008ZX07315-003, 2008ZX07316-002]
- Key Laboratory of Environmental Science and Engineering of Jiangsu Province [ZD071201]
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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 was investigated. It was observed that during WAS anaerobic fermentation 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 increasing temperature from 10 to 35 degrees C, 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 degrees C were improved significantly when WAS was fermented at pH 10.
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