NDLI: Reduction of bromate by biogenic sulfide produced during microbial sulfur disproportionation

Content Provider	Springer Nature Link
Author	Chairez, Monserrat Luna Velasco, Antonia Field, Jim A. Ju, Xiumin Sierra Alvarez, Reyes
Copyright Year	2009
Abstract	Bromate (BrO3 −) is a carcinogenic contaminant formed during ozonation of waters that contain trace amounts of bromide. Previous research shows that bromate can be microbially reduced to bromide using organic (i.e. acetate, glucose, ethanol) and inorganic (H2) electron-donating substrates. In this study, the reduction of bromate by a mixed microbial culture was investigated using elemental sulfur (S0) as an electron donor. In batch bioassays performed at 30°C, bromate (0.30 mM) was completely converted to bromide after 10 days and no accumulation of intermediates occurred. Bromate was also reduced in cultures supplemented with thiosulfate and hydrogen sulfide as electron donor. Our results demonstrated that S0-disproportionating microorganisms were responsible for the reduction of bromate in cultures spiked with S0 through an indirect mechanism involving microbial formation of sulfide and subsequent abiotic reduction of bromate by the biogenic sulfide. Confirmation of this mechanism is the fact that bromate was shown to undergo rapid chemical reduction by sulfide (but not S0 or thiosulfate) in abiotic experiments. Bromate concentrations above 0.30 mM inhibited sulfide formation by S0-disproportionating bacteria, leading to a decrease in the rate of bromate reduction. The results suggest that biological formation of sulfide from by S0 disproportionation could support the chemical removal of bromate without having to directly use sulfide as a reagent.
Starting Page	235
Ending Page	244
Page Count	10
File Format	PDF
ISSN	09239820
Journal	Biodegradation
Volume Number	21
Issue Number	2
e-ISSN	15729729
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-09-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Elemental sulfur Sulfide Bromate reduction Bromide Sulfur disproportionation Waste Management/Waste Technology Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Terrestrial Pollution Geochemistry Soil Science & Conservation Microbiology
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Environmental Engineering Bioengineering Microbiology

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