Whole-cell identification of Acinetobacter spp. Viewed by epifluorescence microscopy. Bar, 10 microns. In situ hybridization of activated sludge from stage 1 of the Munchen II plant with fluorescein-labeled probe ACA. Filamentous bacteria of Eikelboom type 1863 show bright signals. - Source:3Aerobic heterotroph
They can be common in WWTP, but often due to a high abundance in the incoming wastewater 1. Members of the genus generally possess a strictly aerobic heterotrophic metabolism, though no in situ physiological data is available for members within activated sludge treatment plants. Due to the high number of polyphosphate accumulating isolates they were once thought to be the important PAO in EBPR. Although many of these isolates showed high levels of aerobic polyP and PHA accumulation, none could accumulate substrates like acetate and store them anaerobically as PHA. Anaerobic P release was also much lower than that reported for EBPR biomasses, and was not linked causally to the presence of substrate 4 5 6. Cells are rods or cocci occurring in clusters or chains 3. Sometimes filamentous, possessing the 'Eikelboom Type 1863' morphotype 3 7. Not considered important for bulking but has been shown to be enriched in the surface scum layer suggested to be due to the production of biosurfactants and cell wall properties 8.
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