NDLI: Emulsion-enhanced recovery and biodegradation of decabrominated diphenyl ether in river sediments

Content Provider	Springer Nature Link
Author	Chang, Shu Chi Wang, Wei Ting Chen, Yi Ju Chen, Tzu Wen Chiang, Peng Yu Lo, Yun Sung
Copyright Year	2016
Abstract	Polybrominated diphenyl ethers (PBDEs) are flame retardants and regarded as emerging contaminants and persistent organic pollutants (POPs). Due to high lipophilicity and low biodegradability, they tend to accumulate in sediments. Decabrominated diphenyl ether (BDE-209) is the most predominant congener among 209 PBDE congeners in river sediments, accounting for more than 90 % of total PBDEs in most samples. This study is to explore the feasibility of an integrated remedial approach, direct removal by emulsion recovery and subsequent biological reductive debromination.A double emulsion (water in oil in water) was formulated and used in direct recovery of BDE-209 in sediment samples. After this recovery operation, the residual oil left in sediments was used as an electron donor for anaerobic microbial reductive debromination. In order to improve the robustness of this direct recovery method, a variety of operational parameters and environmental variables were tested, such as mixing speed, mixing time, initial concentrations of BDE-209, salinity contents of sediment, and fractions of humic acids. A biodegradation experiment with different humic acid contents and with or without residual emulsion was conducted to compare the biodegradation rates under different conditions. All samples were extracted by using accelerated solvent extraction and detected by a gas chromatography with an electron capture detector.In this study, we used an emulsion to recover BDE-209 in simulated sediment samples with different salinity and humic acid contents. BDE-209 was recovered as much as 96.10 % in a single recovery operation under a condition similar to the real situation of Er-Ren River in Taiwan. The biodegradation of unrecovered BDE-209 was assessed under anaerobic conditions with residual emulsion as an electron donor. The average half-life is 11.7 ± 1.9 days with residual emulsion, which is about 40 % shorter than that of those without emulsion and much shorter than those reported in literature. Real sediment samples were also tested and the result indicated that this method is highly feasible.Emulsion-enhanced recovery and biodegradation could be a highly feasible way to remove BDE-209 in river sediments. This method is not sensitive to the initial concentration of BDE-209 but sensitive to the salinity and humic acid concentration in sediments.
Starting Page	1197
Ending Page	1207
Page Count	11
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	17
Issue Number	4
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-11-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biodegradation Decabrominated diphenyl ether Emulsion Polybrominated diphenyl ethers Sediment remediation Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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