Journal
WATER RESEARCH
Volume 45, Issue 2, Pages 557-564Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2010.09.022
Keywords
Activated sludge models; Endogenous decay; Kinetic parameters estimation; Partial nitrification; Sequencing batch reactors; Nitrite
Funding
- Department of Foreign Affairs and International Trade Canada (DFAIT)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- City of Winnipeg's Water and Waste Department and Regione Toscana (Italy)
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A bench-scale sequencing batch reactor was used to study factors affecting the endogenous decay of the ammonium oxidizing biomass (AOB) in different operating conditions. AOB decay was very sensitive to oxygen concentration, and increased up to 0.4 d(-1) for oxygen concentration of 7 mg O-2 L-1. The decay in anaerobic conditions was shown to be very low (0.03 d(-1)) when compared to literature data. The effect of nitrite and nitrate on AOB decay was also studied. The correlation was quite weak suggesting that both nitrate and nitrite absence had little impact on decay which is contrary to what is typically assumed in some of the existing process models. A simple expression for the decay of AOB was proposed, calibrated and validated using the results of batch kinetic tests and of the continuous sequencing batch reactor monitoring. (c) 2010 Elsevier Ltd. All rights reserved.
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