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Appl Environ Microbiol, May 1998, p. 1878-1883, Vol. 64, No. 5
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Microbiology of a Nitrite-Oxidizing Bioreactor

Paul C. Burrell,1 Jürg Keller,2 and Linda L. Blackall1,*

Advanced Wastewater Management Centre, Departments of Microbiology1 and Chemical Engineering,2 The University of Queensland, Brisbane, 4072, Australia

Received 16 October 1997/Accepted 9 March 1998

The microbiology of the biomass from a nitrite-oxidizing sequencing batch reactor (NOSBR) fed with an inorganic salts solution and nitrite as the sole energy source that had been operating for 6 months was investigated by microscopy, by culture-dependent methods, and by molecular biological methods, and the seed sludge that was used to inoculate the NOSBR was investigated by molecular biological methods. The NOSBR sludge comprised a complex and diverse microbial community containing gram-negative and gram-positive rods, cocci, and filaments. By culture-dependent methods (i.e., micromanipulation and sample dilution and spread plate inoculation), 16 heterotrophs (6 gram positive and 10 gram negative) were identified in the NOSBR sludge (RC), but no autotrophs were isolated. 16S ribosomal DNA clone libraries of the two microbial communities revealed that the seed sludge (GC) comprised a complex microbial community dominated by Proteobacteria (29% beta subclass; 18% gamma subclass) and high G+C gram-positive bacteria (10%). Three clones (4%) were closely related to the autotrophic nitrite-oxidizer Nitrospira moscoviensis. The NOSBR sludge was overwhelmingly dominated by bacteria closely related to N. moscoviensis (89%). Two clone sequences were similar to those of the genus Nitrobacter. Near-complete insert sequences of eight RC and one GC N. moscoviensis clone were determined and phylogenetically analyzed. This is the first report of the presence of bacteria from the Nitrospira phylum in wastewater treatment systems, and it is hypothesized that these bacteria are the unknown nitrite oxidizers in these processes.

* Corresponding author. Mailing address: Department of Microbiology, Advanced Wastewater Management Centre, The University of Queensland, Brisbane 4072, Australia. Phone: 61 7 33651101. Fax: 61 7 33654620. E-mail: blackall{at}florey.biosci.uq.edu.au.

Appl Environ Microbiol, May 1998, p. 1878-1883, Vol. 64, No. 5
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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