Microbial population dynamics in nitrifying reactors: Experimental evidence explained by a simple model including interspecies competition
2008
Volcke, Eveline | Sanchez, Omar | Steyer, Jean-Philippe | Dabert, Patrick | Bernet, Nicolas | Laboratoire de Biotechnologie de l'Environnement [Narbonne] (LBE) ; Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Department of Applied Mathematics, Biometrics and Process Control ; Universiteit Gent = Ghent University = Université de Gand (UGENT) | Universidad Católica del Norte = Catholic University of the North [Antofagasta] (UCN) | Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)
International audience
Mostrar más [+] Menos [-]Inglés. Key biological processes such as nitrification do not result from the work of a single bacterial species but are performed by a wide variety of bacteria. However, this microbial diversity is usually not tracked during reactor operation and mostly neglected in present mathematical models, which distinguish at the most between ammonium oxidizers and nitrite oxidizers, assuming the same properties for all bacteria of each group. Nevertheless, experimental evidence is available that different process conditions may favour the selection of different types of bacteria. This contribution deals with observed differences between two nitrifying inverse turbulent bed reactors (ITBRs) with different solid hold-ups. It also contains additional experimental data, revealing a microbial population shift upon changing the operating conditions in one of these reactors. The reactor behaviour is described with a basic two-step nitrification model, which includes the competition between two different types of ammonium oxidizers, besides nitrite oxidizers. Considering the oxygen concentration as the key variable governing the population shift, the influence of microbial growth parameters on the competition dynamics is assessed.
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