Enhanced Biological Phosphorus Removal Performance and Microbial Population Changes at High Organic Loading Rates
Publication: Journal of Environmental Engineering
Volume 133, Issue 10
Abstract
A laboratory-scale sequencing batch reactor was operated and the dynamics of Rhodocyclus-related phosphorus-accumulating organisms (PAOs) population was monitored. After the system reached a steady state and showed a stable enhanced biological phosphorus removal status, the organic loading rate was increased from 160 to in five steps. When the P storage capacity reached maximum at , the system lost the stability and the effluent phosphorus concentration fluctuated. As the organic loading rate increased from 160 to , the PAO population decreased from to % and internal polyphosphate content decreased from 0.20 to . Phosphate-accumulating metabolism was weakened as the organic loading rate increased and PAO population decreased concomitantly, whereas glycogen-accumulating metabolism increased at high organic loading rates as supported by the increased intracellular glycogen content and production of a higher fraction of intracellular poly- -hydroxyl valerate.
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Acknowledgments
This work was supported by the nine dairies in Wisconsin through Wisconsin Department of Natural Resources (WDNR) and Wisconsin Milk Marketing Board (WMMB) (Agreement No. UW0202). The writers wish to thank Dr. Jenchie Wang and George F. Wells for their kind discussion of the manuscript.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 133 • Issue 10 • October 2007
Pages: 962 - 969
Copyright
© 2007 ASCE.
History
Received: Oct 5, 2006
Accepted: Apr 16, 2007
Published online: Oct 1, 2007
Published in print: Oct 2007
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