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Spatial distribution of ammonia-oxidizing bacteria in the biofilm and suspended growth biomass of the full- and partial-bed biological aerated filters

Lookup NU author(s): Professor Thomas Donnelly


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The extent of comparable nitrogen removal in the full- and partial-bed biological aerated reactors needs further microbiological evidence, specifically the existence of ammonia-oxidizing bacteria (AOB). The nitrogen removal process in such systems is typically initiated by chemoliautotrophic ammonia-oxidizing bacteria converting ammonia to nitrite and traces of oxidized nitrogen gases. The formation of a dense biofilm as a result of higher turbulence would account for the higher number of AOB cells enumerated in the biofilm samples from the partial-bed reactor (4.3 105 ± 1.9 105 No. of AOB cells/mL sample) as compared with those from the full-bed reactor (1.5 105 ± 8.0 104 No. of AOB cells/mL sample).

Publication metadata

Author(s): Fatihah S, Donnelly T

Publication type: Article

Publication status: Published

Journal: Canadian Journal of Civil Engineering

Year: 2009

Volume: 36

Issue: 11

Pages: 1859-1866

ISSN (print): 0315-1468

ISSN (electronic): 1208-6029

Publisher: NRC Research Press


DOI: 10.1139/L09-108


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