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Applied and Environmental Microbiology, June 2000, p. 2372-2377, Vol. 66, No. 6
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Anaerobic-Aerobic Process for Microbial Degradation of Tetrabromobisphenol A

Zeev Ronen* and Aharon Abeliovich

Department of Environmental Hydrology and Microbiology, Ben Gurion University of the Negev, The Jacob Blaustein Institute for Desert Research, Sede Boker Campus 84900, Israel

Received 6 December 1999/Accepted 22 March 2000

Tetrabromobisphenol A (TBBPA) is a flame retardant that is used as an additive during manufacturing of plastic polymers and electronic circuit boards. Little is known about the fate of this compound in the environment. In the current study we investigated biodegradation of TBBPA, as well as 2,4,6-tribromophenol (TBP), in slurry of anaerobic sediment from a wet ephemeral desert stream bed contaminated with chemical industry waste. Anaerobic incubation of the sediment with TBBPA and peptone-tryptone-glucose-yeast extract medium resulted in a 80% decrease in the TBBPA concentration and accumulation of a single metabolite. This metabolite was identified by gas chromatography-mass spectrometry (GC-MS) as nonbrominated bisphenol A (BPA). On the other hand, TBP was reductively dehalogenated to phenol, which was further metabolized under anaerobic conditions. BPA persisted in the anaerobic slurry but was degraded aerobically. A gram-negative bacterium (strain WH1) was isolated from the contaminated soil, and under aerobic conditions this organism could use BPA as a sole carbon and energy source. During degradation of BPA two metabolites were detected in the culture medium, and these metabolites were identified by GC-MS and high-performance liquid chromatography as 4-hydroxybenzoic acid and 4-hydroxyacetophenone. Both of those compounds were utilized by WH1 as carbon and energy sources. Our findings demonstrate that it may be possible to use a sequential anaerobic-aerobic process to completely degrade TBBPA in contaminated soils.

* Corresponding author. Mailing address: Department of Environmental Hydrology and Microbiology, Ben Gurion University of the Negev, The Jacob Blaustein Institute for Desert Research, Sede Boker Campus 84990, Israel. Phone: 972-7-6596836. Fax: 972-7-6596831. E-mail: zeevrone{at}bgumail.bgu.ac.il.

Applied and Environmental Microbiology, June 2000, p. 2372-2377, Vol. 66, No. 6
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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