Bioaugmentation with Nitrifying Bacteria Acclimated to Different Temperatures
Publication: Journal of Environmental Engineering
Volume 131, Issue 7
Abstract
A nitrifying biomass was produced from anaerobic sludge dewatering liquors for the purpose of bioaugmentation of sequencing batch reactors (SBRs). Nitrification of centrate was conducted at four temperatures (10, 20, 25, and 30°C) while the seeded SBRs were operated at 10°C with a solids retention time of approximately 4 days. The SBRs did not exhibit any nitrification before the onset of seeding. When the hydraulic retention time (HRT) was 24 h, partial removal of occurred when seed acclimated to 20, 25, and 30°C was added. When the HRT was 12 h, only the SBR seeded with nitrifying biomass acclimated to 10°C achieved 50% removal. Complete removal of was not achieved in any of the seeded SBRs. The degree of removal in the seeded SBRs was dependent on the initial temperature of the seed, and the observed growth rates of the nitrifying bacteria were inversely proportional to the change in temperature.
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Acknowledgments
This study was funded by the Natural Sciences and Engineering Research Council (NSERC grant), the University of Manitoba, the City of Winnipeg Water and Waste Department, and EarthTech Winnipeg. The writers acknowledge P. Lagasse (Wastewater Engineer), A. Zaleski (Research Chemist), K. Kjartanson (Research Engineer) from the City of Winnipeg, D. Taniguchi, and Dr. S. Danesh from EarthTech, Dr. P. Kos (Private Consultant) and J. Tingley (Laboratory Technician) for their contributions to this research.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 131 • Issue 7 • July 2005
Pages: 1046 - 1051
Copyright
© 2005 ASCE.
History
Received: Feb 24, 2003
Accepted: Sep 24, 2004
Published online: Jul 1, 2005
Published in print: Jul 2005
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