Are some putative glycogen accumulating organisms (GAO) in anaerobic:aerobic activated sludge systems members of the alpha-Proteobacteria?
Date
2004
Authors
Beer, M.J.
Kong, Y.
Seviour, R.
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Journal article
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Microbiology (United Kingdom), 2004; 150(7):2267-2275
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Abstract
<jats:p>
Activated sludge plants designed to remove phosphorus microbiologically often perform unreliably. One suggestion is that the polyphosphate-accumulating organisms (PAO) are out-competed for substrates by another group of bacteria, the glycogen-accumulating organisms (GAO) in the anaerobic zones of these processes. This study used fluorescence
<jats:italic>in situ</jats:italic>
hybridization (FISH) and denaturing gradient gel electrophoresis (DGGE) to analyse the communities from laboratory-scale anaerobic : aerobic sequencing batch reactors. Members of the genus
<jats:italic>Sphingomonas</jats:italic>
in the
<jats:italic>α</jats:italic>
-
<jats:italic>Proteobacteria</jats:italic>
were present in large numbers in communities with poor phosphorus removal capacity where the biomass had a high glycogen content. Their ability to store poly-
<jats:italic>β</jats:italic>
-hydroxyalkanoates anaerobically, but not aerobically, and not accumulate polyphosphate aerobically is consistent with these organisms behaving as GAO there. No evidence was found to support an important role for the
<jats:italic>γ</jats:italic>
-
<jats:italic>Proteobacteria</jats:italic>
as possible GAO in these communities, although these bacterial populations have been considered in other studies to act as possible competitors for the PAO.
</jats:p>
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