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Microbial population dynamics in nitrifying reactors: Experimental evidence explained by a simple model including interspecies competition

Paper ID Volume ID Publish Year Pages File Format Full-Text
35755 45105 2008 9 PDF Available
Title
Microbial population dynamics in nitrifying reactors: Experimental evidence explained by a simple model including interspecies competition
Abstract

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.

Keywords
Inverse turbulent bed reactor; Microbial competition; Modelling; Nitrification; SSCP; Wastewater treatment
First Page Preview
Microbial population dynamics in nitrifying reactors: Experimental evidence explained by a simple model including interspecies competition
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 43, Issue 12, December 2008, Pages 1398–1406
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering