Abstract
Recent studies using quantitative fluorescence in situ hybridization (FISH) have supported the principle that there are mycolata concentration thresholds, above which foaming is likely to occur. In this study, we surveyed 14 wastewater treatment plants (WWTPs) in the UK, using quantitative FISH, to establish that the principle of a mycolata threshold (2×10 6 mycolata cells ml −1 mixed liquor suspended solids) is an empirical though widely held value. In addition, we designed, optimized and applied probes for members of the less hydrophobic mycolata genera Corynebacterium and Dietzia, to show that these organisms dominated the mycolata populations in two non-foaming WWTPs where the mycolata concentrations were above the threshold value. We propose that the mycolata threshold value is only applicable to hydrophobic members of the mycolata.
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