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Characterization of bromate-reducing bacterial isolates and their potential for drinking water treatment

Authors
Journal
Water Research
0043-1354
Publisher
Elsevier
Publication Date
Volume
45
Issue
18
Identifiers
DOI: 10.1016/j.watres.2011.09.001
Keywords
  • Bioaugmentation
  • Biologically Active Carbon
  • Bromate
  • Bromide
  • Drinking Water
  • Reduction
Disciplines
  • Biology

Abstract

Abstract The objective of the current study was to isolate and characterize several bromate-reducing bacteria and to examine their potential for bioaugmentation to a drinking water treatment process. Fifteen bromate-reducing bacteria were isolated from three sources. According to 16S rRNA gene sequencing, the bromate-reducing bacteria are phylogenetically diverse, representing the Actinobacteria, Bacteroidetes, Firmicutes, and α-, β-, and γ- Proteobacteria. The broad diversity of bromate-reducing bacteria suggests the widespread capability for microbial bromate reduction. While the cometabolism of bromate via nitrate reductase and (per)chlorate reductase has been postulated, five of our bromate-reducing isolates were unable to reduce nitrate or perchlorate. This suggests that a bromate-specific reduction pathway might exist in some microorganisms. Bioaugmentation of activated carbon filters with eight of the bromate-reducing isolates did not significantly decrease start-up time or increase bromate removal as compared to control filters. To optimize bromate reduction in a biological drinking water treatment process, the predominant mechanism of bromate reduction (i.e., cometabolic or respiratory) needs to be assessed so that appropriate measures can be taken to improve bromate removal.

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