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Appl. Environ. Microbiol., 05 1995, 1910-1916, Vol 61, No. 5
PL Bond, P Hugenholtz, J Keller and LL Blackall
The bacterial community structures of phosphate- and non-phosphate-
removing activated sludges were compared. Sludge samples were obtained from
two sequencing batch reactors (SBRs), and 16S rDNA clone libraries of the
bacterial sludge populations were established. Community structures were
determined by phylogenetic analyses of 97 and 92 partial clone sequences
from SBR1 (phosphate-removing sludge) and SBR2 (non-phosphate-removing
sludge), respectively. For both sludges, the predominant bacterial group
with which clones were affiliated was the beta subclass of the
proteobacteria. Other major groups represented were the alpha
proteobacterial subclass, planctomycete group, and
Flexibacter-Cytophaga-Bacteroides group. In addition, several clone groups
unaffiliated with known bacterial assemblages were identified in the clone
libraries. Acinetobacter spp., thought to be important in phosphate removal
in activated sludge, were poorly represented by clone sequences in both
libraries. Differences in community structure were observed between the
phosphate- and non-phosphate-removing sludges; in particular, the
Rhodocyclus group within the beta subclass was represented to a greater
extent in the phosphate-removing community. Such differences may account
for the differing phosphate-removing capabilities of the two activated
sludge communities.
Copyright © 1995, American Society for Microbiology
Bacterial community structures of phosphate-removing and non-phosphate- removing activated sludges from sequencing batch reactors
CRC for Waste Management and Pollution Control Limited, Department of Microbiology, Brisbane, Queensland, Australia.
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