1887

Abstract

In an acetate-fed anaerobic–aerobic membrane bioreactor, a deteriorated enhanced biological phosphorus removal (EBPR) community was developed (as determined based on the chemical profiles of organic substrate, soluble phosphate, and intracellular carbohydrate and polyhydroxyalkanote (PHA) concentrations). Microscopic observations revealed the dominance of tetrad-forming organisms (TFOs), of which the majority stained positively for PHA under anaerobic conditions. Fluorescence hybridization (FISH) confirmed that the (85·0±7·0 % of total cells) were the most dominant group. A 16S rRNA gene clone library specific for the indicated that most 16S rRNA gene clones (61 % of total clones) were closely affiliated with ‘’, forming a cluster within subgroup 1 of the . Combined PHA staining and FISH with specific probes designed for the members of the ‘’ cluster suggested diversity within this TFO cluster, and that these TFOs were newly identified glycogen-accumulating organisms in EBPR systems. However, these ‘’-related TFOs were only seen in low abundance in 12 different EBPR and non-EBPR systems, suggesting that they were not the key populations responsible for the deterioration of full-scale EBPR processes.

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2004-11-01
2019-10-23
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