Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6308970 | Chemosphere | 2014 | 7 Pages |
Abstract
Decabromodiphenyl ether (BDE209) is a ubiquitous persistent pollutant and has contaminated the environment worldwide. To accelerate BDE209 elimination and reveal the mechanism concerned, the biosurfactant tea saponin enhanced degradation of BDE209 by Brevibacillus brevis was conducted. The results revealed that tea saponin could efficiently increase the solubility of BDE209 in mineral salts medium and improve its biodegradation. The degradation efficiency of 0.5 mg Lâ1 BDE209 by 1 g Lâ1 biomass with surfactant was up to 55% within 5 d. Contact time was a significant factor for BDE209 biodegradation. BDE209 biodegradation was coupled with bioaccumulation, ion release and utilization, and debromination to lower brominated PBDE metabolites. During the biodegradation process, B. brevis metabolically released Na+, NH4+, NO2â and Clâ, and utilized the nutrient ions Mg2+, PO43â and SO42â. GC-MS analysis revealed that the structure of BDE209 changed under the action of strain and nonabromodiphenyl ethers (BDE-208, -207 and -206), octabromodiphenyl ethers (BDE-203, -197 and -196) and heptabromodiphenyl ether (BDE-183) were generated by debromination.
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Authors
Shaoyu Tang, Jieqiong Bai, Hua Yin, Jinshao Ye, Hui Peng, Zehua Liu, Zhi Dang,