Characterization of bromate-reducing bacterial isolates and their potential for drinking water treatment |
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Authors: | Davidson Andrew N Chee-Sanford Joanne Lai Hoi Yi Mandy Ho Chi-hua Klenzendorf J Brandon Kirisits Mary Jo |
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Affiliation: | a Department of Civil, Architectural, and Environmental Engineering, The University of Texas at Austin, 1 University Station C1786, Austin, TX 78712, USA b Department of Natural Resources and Environmental Sciences, The University of Illinois at Urbana-Champaign, 1102 South Goodwin Mailcode 047, Urbana, IL 61801, USA c Geosyntec Consultants, 3600 Bee Caves Road, Suite 101, Austin, TX 78746, USA |
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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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Keywords: | Bioaugmentation Biologically active carbon Bromate Bromide Drinking water Reduction |
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