Browse by author
Lookup NU author(s): Dr Cesar Mota
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
Changes in the fractions of ammonia-oxidizing bacteria and nitrite-oxidizing bacteria in two laboratory-scale reactors were investigated using 16S rRNA probe hybridizations. The reactors were operated in intermittent aeration mode and different aeration cycles to treat anaerobically digested swine wastewater with ammonia concentrations up to 175 mg NH3-N/L. High ammonia removals (>98.8%) were achieved even with increased nitrogen loads and lower aeration: non-aeration time ratios of 1 h:3 h. Nitrosomonas/Nitrosococcus mobilis were the dominant ammonia-oxidizing bacteria in the reactors. Nitrospira-like organisms were the dominant nitrite-oxidizing bacteria during most of the investigation, but were occasionally outcompeted by Nitrobacter. High levels of nitrifiers were measured in the biomass of both reactors, and ammonia-oxidizing bacteria and nitrite-oxidizing bacterial levels adjusted to changing aeration: non-aeration time ratios. Theoretical ammonia-oxidizer fractions, determined by a mathematical model, were comparable to the measured values, although the measured biomass fractions were different at each stage while the theoretical values remained approximately constant. Stable ammonia removals and no nitrite accumulation were observed even when rRNA levels of ammonia oxidizers and nitrite-oxidizers reached a minimum of 7.2% and 8.6% of total rRNA, respectively. Stable nitrogen removal performance at an aeration: non-aeration ratio of 1 h:3 h suggests the possibility of significant savings in operational costs.
Author(s): Mota CR, Ridenoure J, Cheng J, de los Reyes FL
Publication type: Article
Publication status: Published
Journal: FEMS Microbiology Ecology
Year: 2005
Volume: 54
Issue: 3
Pages: 391-400
Print publication date: 15/06/2005
ISSN (print): 0168-6496
ISSN (electronic): 1574-6941
URL: http://dx.doi.org/10.1016/j.femsec.2005.05.001
DOI: 10.1016/j.femsec.2005.05.001
Altmetrics provided by Altmetric
