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Published on: August 17, 2019
Reductive Debromination of Polybrominated Diphenyl Ethers - Microbes, Processes and Dehalogenases
Siyan Zhao1, Matthew J Rogers1, Chang Ding2
1Department of Civil and Environmental Engineering, National University of Singapore, Singapore, Singapore.
Polybrominated diphenyl ethers (PBDEs) contaminate ecosystems globally. This review focuses on anaerobic microbes for PBDE bioremediation, exploring debromination pathways and genes involved in this cost-effective cleanup method.
Area of Science:
- Environmental Science
- Microbiology
- Bioremediation
Background:
- Polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants widely distributed due to their use as flame retardants.
- Elevated PBDE levels in biota and human tissues highlight significant environmental and health risks.
- Legacy contamination and ongoing PBDE discharge necessitate effective remediation strategies.
Purpose of the Study:
- To review anaerobic microbes capable of debrominating PBDEs.
- To explore metabolic pathways of reductive debromination for PBDE congeners.
- To discuss dehalogenase genes involved in PBDE bioremediation.
Main Methods:
- Literature review focusing on anaerobic bioremediation of PBDEs.
- Analysis of microbial debromination mechanisms and synergistic microbial interactions.
- Examination of genetic factors influencing PBDE degradation.
Main Results:
- Identification of anaerobic microbes and microbial consortia that can debrominate PBDEs.
- Elucidation of reductive debromination pathways for various PBDE congeners.
- Characterization of key dehalogenase genes and enzymes responsible for PBDE breakdown.
Conclusions:
- Anaerobic bioremediation offers a cost-effective and environmentally friendly approach for PBDE contamination.
- Understanding microbial consortia and metabolic pathways is crucial for optimizing PBDE bioremediation.
- Further research into dehalogenase genes can lead to enhanced bioremediation technologies for PBDEs.
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Ethers are organic compounds with an ether functional group which is characterized by an oxygen atom connected to two — identical or different — alkyl, aryl, or vinyl groups. The C–O–C linkage in dimethyl ether — the simplest ether — has an approximately tetrahedral bond angle of 110.3 degrees. The oxygen atom is sp3- hybridized, with the C–O distance being about 140 pm.
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