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Anammox Studies Using New York City Centrate to Correlate Performance, Population Dynamics and Impact of Toxins

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The City College of New York has been operating a bench scale Anammox sequencing batch reactor (SBR) since January 2008 with the objective to enrich granular Anammox biomass in anaerobic digester centrate. Multiple process upsets diminished or eliminated Anammox activity for the first 7 months of operation, but a constant nitrogen loading rate has been applied since September 2008. Nitrite toxicity was investigated as a possible cause of Anammox deactivation, but results from batch activity tests showed no inhibitory effect at concentrations up to 200 mg/L NO2 -N. However, abrupt spikes in reactor nitrite concentrations are the clearest symptom of process instability, and frequent monitoring of reactor NO2 -N has allowed for fast responses to reactor upsets.
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Keywords: Anammox; Nitrite Toxicity; Nitrogen Removal; SBR

Document Type: Research Article

Publication date: 2009-01-01

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