Comparison of decabromodiphenyl ether degradation in long-term operated anaerobic bioreactors under thermophilic and mesophilic conditions and the pathways involved.

Chen Shi, Yong Hu, Takuro Kobayashi, Nan Zhang, Hidetoshi Kuramochi, Zhenya Zhang, Zhongfang Lei, Kai-Qin Xu

Journal of environmental management 2021 Sep 15

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Anaerobic digestion of decabromodiphenyl ether was carried out and compared in two continuously stirred anaerobic bioreactors for 210 days under thermophilic and mesophilic conditions. Results show that the degradation of decabromodiphenyl ether followed the first-order reaction kinetics, which exhibited a higher removal rate in the thermophilic reactor when compared to the mesophilic one, reaching its maximum of 1.1 μg·day-1. The anaerobic digestion of decabromodiphenyl ether was found to involve the replacement of bromines from polybrominated diphenyl ether by hydrogen atoms, gradually forming nona-, octa- and hepta-brominated diphenyl ether, respectively. Under the thermophilic condition, the reactors were dominated by Bacillus sp. and Methanosarcina sp. with high bioactivity and high concentrations of debromination microorganisms. Copyright © 2021 Elsevier Ltd. All rights reserved.

Citation

Chen Shi, Yong Hu, Takuro Kobayashi, Nan Zhang, Hidetoshi Kuramochi, Zhenya Zhang, Zhongfang Lei, Kai-Qin Xu. Comparison of decabromodiphenyl ether degradation in long-term operated anaerobic bioreactors under thermophilic and mesophilic conditions and the pathways involved. Journal of environmental management. 2021 Sep 15;294:113009