Degradation of BDE-47 in mangrove sediments with amendment of extra carbon sources.

Abstract:

:Polybrominated diphenyl ethers (PBDEs) are widely detected in coastal wetlands but their remediation is still difficult. In this study, different carbon sources, namely formate, acetate, pyruvate, lactate, succinate, methanol and ethanol, were added to mangrove sediments contaminated with BDE-47, a common PBDE congener, to enhance its degradation. After 2-month incubation, all carbon addition significantly enhanced degradation percentages. The residual BDE-47 percentage significantly correlated with the abundance of total bacteria and Dehalococcoides spp. The addition of methanol, acetate and succinate also achieved significantly higher degradation rates and shorter half-lives than sediments without carbon amendment at the end of 5-month incubation, although degradation percentages were comparable between sediments with and without extra carbon. The degradation pathway based on the profiles of degradation products was also similar among treatments. The results indicated the stimulatory effect of extra carbon sources on BDE-47 degradation in contaminated sediments was carbon- and time-specific.

journal_name

Mar Pollut Bull

authors

Pan Y,Chen J,Zhou H,Cheung SG,Tam NFY

doi

10.1016/j.marpolbul.2020.110972

subject

Has Abstract

pub_date

2020-04-01 00:00:00

pages

110972

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(20)30090-4

journal_volume

153

pub_type

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