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Ecophysiology of abundant denitrifying bacteria in activated sludge
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Ecophysiology of abundant denitrifying bacteria in activated sludge
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Journal Article
Ecophysiology of abundant denitrifying bacteria in activated sludge
2007
Overview
The abundance of potential denitrifiers in full-scale wastewater treatment plants with biological nitrogen and phosphorus removal was investigated by FISH and various oligonucleotide probes. The potential denitrifiers were characterized as probe-defined populations that were able to consume radiolabelled substrate with oxygen, nitrate and nitrite as electron acceptor as determined by microautoradiography. The most abundant potential denitrifiers were related to the genera Aquaspirillum, Azoarcus, Thauera and Rhodocyclus, all within the Betaproteobacteria. They made up 20-49% of all bacteria in most of the 17 nitrogen removal plants investigated and were hardly present in four plants without denitrification. The ecophysiology of Aquaspirillum, Azoarcus and Thauera-related bacteria was consistent within each probe-defined group in the plants investigated. These three groups showed distinct physiological differences, with the Aquaspirillum-related bacteria appearing as the most specialized one, consuming only amino acids among the substrates tested, and Thauera as the most versatile consuming some volatile fatty acids, ethanol and amino acids. The coexistence of Aquaspirillum, Azoarcus and Thauera-related bacteria in a range of treatment plants with differences in wastewater, design and operation suggest that the populations ensure a functional stability of the plants by occupying different ecological niches related to the carbon transformation.
Publisher
Oxford, UK : Blackwell Publishing Ltd,Blackwell Publishing Ltd,Blackwell,Oxford University Press
Subject
/ Azoarcus
/ Bacteria
/ Betaproteobacteria - classification
/ Betaproteobacteria - genetics
/ Betaproteobacteria - isolation & purification
/ Betaproteobacteria - metabolism
/ Biological and medical sciences
/ carbon
/ Ecology
/ Environmental Restoration and Remediation
/ Ethanol
/ fluorescence in situ hybridization
/ Fundamental and applied biological sciences. Psychology
/ genetics
/ In Situ Hybridization, Fluorescence
/ Niches
/ nitrates
/ nitrites
/ nitrogen
/ oxygen
/ Sewage
/ Thauera
