Enumeration of Organohalide Respirers in Municipal Wastewater Anaerobic Digesters

Organohalide contaminants such as triclosan and triclocarban have been well documented in municipal wastewater treatment plants (WWTPs), but the degradation of these contaminants is not well understood. One possible removal mechanism is organohalide respiration by which bacteria reduce the halogenat...

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Bibliographic Details
Published in:Microbiology Insights 2015-10, Vol.2015 (S2), p.9-14
Main Authors: Smith, Bryan J.K., Boothe, Melissa A., Fiddler, Brice A., Lozano, Tania M., Rahi, Russel K., Krzmarzick, Mark J.
Format: Article
Language:English
Subjects:
Carcinogenesis
Management
Original Research
Purification
Sewage
Wastewater
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Summary:Organohalide contaminants such as triclosan and triclocarban have been well documented in municipal wastewater treatment plants (WWTPs), but the degradation of these contaminants is not well understood. One possible removal mechanism is organohalide respiration by which bacteria reduce the halogenated compound. The purpose of this study was to determine the abundance of organohalide-respiring bacteria in eight WWTP anaerobic digesters. The obligate organohalide respiring Dehalococcoides mccartyi was the most abundant and averaged 3.3 × 107 copies of 16S rRNA genes per gram, while the Dehalobacter was much lower at 2.6 × 104 copies of 16S rRNA genes per gram. The genus Sulfurospirillum spp. was also detected at 1.0 × 107 copies of 16S rRNA genes per gram. No other known or putatively organohalide-respiring strains in the Dehalococcoidaceae family were found to be present nor were the genera Desulfitobacterium or Desulfomonile.
ISSN:1178-6361
1178-6361
DOI:10.4137/MBI.S31445