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Quantifying Community Dynamics of Nitrifiers in Functionally Stable Reactors.
- Source :
-
Applied & Environmental Microbiology . Jan2008, Vol. 74 Issue 1, p286-293. 8p. 1 Diagram, 1 Chart, 3 Graphs. - Publication Year :
- 2008
-
Abstract
- A sequential batch reactor (SBR) and a membrane bioreactor (MBR) were inoculated with the same sludge from a municipal wastewater treatment plant, supplemented with ammonium, and operated in parallel for 84 days. It was investigated whether the functional stability of the nitrification process corresponded with a static ammonia-oxidizing bacterial (AOB) community. The SBR provided complete nitrification during nearly the whole experimental run, whereas the MBR showed a buildup of 0 to 2 mg nitrite-N liter-1 from day 45 until day 84. Based on the denaturing gradient gel electrophoresis profiles, two novel approaches were introduced to characterize and quantify the community dynamics and interspecies abundance ratios: (i) the rate of change [Δt(week)] parameter and (ii) the Pareto-Lorenz curve distribution pattern. During the whole sampling period, it was observed that neither of the reactor types maintained a static microbial community and that the SBR evolved more gradually than the MBR, particularly with respect to AOB (i.e., average weekly community changes of 12.6% ± 5.2% for the SBR and 24.6% ± 143% for the MBR). Based on the Pareto-Lorenz curves, it was observed that only a small group of AOB species played a numerically dominant role in the nitritation of both reactors, and this was true especially for the MBR. The remaining less dominant species were speculated to constitute a reserve of AOB which can proliferate to replace the dominant species. The value of these parameters in terms of tools to assist the operation of activated-sludge systems is discussed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00992240
- Volume :
- 74
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Applied & Environmental Microbiology
- Publication Type :
- Academic Journal
- Accession number :
- 28839759
- Full Text :
- https://doi.org/10.1128/AEM.01006-07