Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 14, Pages 7051-7056Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.04.069
Keywords
Anammox; Free ammonia; Inhibition; Moving bed biofilm reactor; Nitrite
Funding
- Natural Sciences and Engineering Research Council of Canada
- Manitoba Department of Conservation
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Two bench-scale parallel moving bed biofilm reactors (MBBR) were operated to assess pH-associated anammox activity changes during long term treatment of anaerobically digested sludge centrate pre-treated in a suspended growth partial nitrification reactor. The pH was maintained at 6.5 in reactor R1, while it was allowed to vary naturally between 7.5 and 8.1 in reactor R2. At high nitrogen loads reactor R2 had a 61% lower volumetric specific nitrogen removal rate than reactor R1. The low pH and the associated low free ammonia (FA) concentrations were found to be critical to stable anammox activity in the MBBR. Nitrite enhanced the nitrogen removal rate in the conditions of low pH, all the way up to the investigated level of 50 mg NO2-N/L. At low FA levels nitrite concentrations up to 250 mg NO2-N/L did not cause inactivation of anammox consortia over a 2-days exposure time. (C) 2011 Elsevier Ltd. All rights reserved.
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