Diversity and distribution of a deeply branched novel proteobacterial group found in anaerobic-aerobic activated sludge processes

Yunhong Kong, Say Leong Ong, Wun Jun Ng, Wen Tso Liu

Research output: Contribution to journalArticlepeer-review

Abstract

A novel coccobacilli group found previously in enhanced biological phosphorus removal (EBPR) systems was further revealed to have a high degree of diversity and distribution in various activated sludge systems. Phylogenetic analysis based on 14 existing and 18 newly retrieved 16S rRNA sequences revealed that these sequences formed a novel cohesive cluster with seven subgroups in the γ-Proteobacteria. Fluorescence in situ hybridization with a set of probes designed specifically targeting the novel group at different hierarchical levels showed that the novel group with a coccoid (2-4 μm) to occasionally long-rod (up to 20 μm) shape widely distributed and in some cases predominated in sludge samples taken from nine lab- and full-scale EBPR systems (10-50% of total cells) and four conventional activated sludge systems (1-10%). Variation of predominance was also observed among those subgroups in systems showing deteriorated or effective EBPR activity.

Original languageEnglish (US)
Pages (from-to)753-757
Number of pages5
JournalEnvironmental Microbiology
Volume4
Issue number11
DOIs
StatePublished - Nov 1 2002
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics

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