Journal
CHEMOSPHERE
Volume 117, Issue -, Pages 455-461Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2014.07.077
Keywords
BDE-209; Debromination; Toxicity; H-2 evolution
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Funding
- Chongqing Natural Research Program of China [cstc2012jjA90020]
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This study investigated the effects of nano- and micro-scale zero-valent iron (nZVI and mZVI) particles on Dehalococcoides sp. strain CBDB1 participating in anaerobic reduction of polybrominated diphenyl ethers. nZVI (>0.25 g L-1) had an inhibitory effect upon this strain, whereas 1.0 g L-1 mZVI showed no negative impact on bacterial growth. Strain CBDB1 could only utilize lower brominated congeners (<7 bromines) as electron acceptor. In the bio-ZVI system, decabromodiphenyl ether (BDE-209) was first reduced by ZVI to lower brominated congeners, which were then dehalogenated to diphenyl ether by CBDB1. Within 30 d, a BDE-209 debromination efficiency of 16% and 24% was obtained in the bio-nZVI (0.25 g L-1) and bio-mZVI (1.0 g L-1) systems with a corresponding diphenyl ether yield efficiency of 14% and 19%, respectively. The debromination efficiency increased significantly from 8% to 24% with an increase of mZVI dosage from 0.25 to 1.0 g L-1 in the bio-mZVI system. (C) 2014 Elsevier Ltd. All rights reserved.
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