Effects of electron donors on anaerobic microbial debromination of polybrominated diphenyl ethers (PBDEs) |
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Authors: | Mengde Qiu " target="_blank">Meiying Xu |
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Institution: | (1) State Key Laboratory of Applied Microbiology (Ministry—Guangdong Province Jointly Breeding Base), South China, Guangzhou, 510070, China;(2) Guangdong Institute of Microbiology, 100 Central Xianlie Road, Guangzhou, 510070, China;(3) Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangzhou, 510070, China;(4) Guangdong Open Laboratory of Applied Microbiology, Guangzhou, 510070, China;(5) South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China;(6) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China;(7) Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China; |
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Abstract: | Polybrominated diphenyl ethers (PBDEs) are a class of widely used flame retardants that have been highly accumulated in sediments.
It is reported that microorganisms play an important role in the reductive debromination of PBDEs in anaerobic sediments.
However, little is known about the effects of electron donors on the microbial community structure and their debromination
capacity in PBDE transformation. In this study, alternate carbon substrates were used as electron donors to enrich the PBDE-debrominating
microbial consortia to evaluate the effects of electron donors on PBDE microbial debromination. Decabromodiphenyl ether (BDE-209)
was found to be the dominant (more than 50%) PBDEs congener in all consortia, and the percentage of BDE-209 was deceased by
12% (methanol), 11% (ethanol), 8% (acetate), 9% (lactate), 5% (pyruvate), and 11% (no electron donors), while the relative
abundances of most lesser-brominated PBDEs increased after 90-day incubation compared to the initial profile of PBDEs. Substantial
shifts in the microbial community structure among different amendments were observed based on denaturing gradient gel electrophoresis
results. Pseudomonas spp. were identified to be the predominant organisms and the abundances of Band R, which was associated with Pseudomonas sp. SCSWA09, was well correlated with the biodegradation rate of BDE-209. Finally, the microbial community structure was
highly correlated with the concentration of deca-BDE, octa-BDE and total nitrogen. These results provide insights into in
situ bioremediation of environments contaminated by PBDEs and our understanding of microbial ecology associated with PBDE-debromination. |
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