Journal
WATER RESEARCH
Volume 101, Issue -, Pages 147-156Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2016.05.059
Keywords
Partial nitritation; Mainstream; Low temperature; NOB-Repression; AOB-Enrichment; Anammox
Funding
- Spanish Ministerio de Economia y Competitividad through the DESDEMONA project [CTQ2014-60495-R]
- Marie Curie Intra European Fellowship (GreenN2) within the 7th European Community Framework Programme [PIEF-GA-2012-326705]
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A granular airlift reactor enriched in ammonia oxidizing bacteria (AOB) was operated at 10 degrees C performing stable partial nitritation in the long-term. The reactor treated a synthetic low-strength influent during 250 days with an average nitrogen loading rate of 0.63 +/- 0.06 g N L-1 d(-1). Nitrate production was barely detected, being the average concentration in the effluent of 0.6 +/- 0.3 mg N-NO3 L-1. Furthermore, a suitable effluent for a subsequent reactor performing the anammox process was achieved. A maximum specific growth rate as high as 0.63 +/- 0.05 d(-1) was determined by performing kinetic experiments with the granular sludge in a chemostat and fitting the results to the Monad model. Pyrosequencing analysis showed a high enrichment in AOB (41 and 65% of the population were identified as Nitrosomonas genus on day 98 and 233, respectively) and an effective repression of nitrite oxidizing bacteria in the long-term. Pyrosequencing analysis also identified the coexistence of nitrifying bacteria and heterotrophic psychrotolerant microorganisms in the granular sludge. Some psychrotolerant microorganisms are producers of cryoprotective extracellular polymeric substances that could explain the better survival of the whole consortia at cold temperatures. (C) 2016 Elsevier Ltd. All rights reserved.
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