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Biochar has widely applied as sorbent for sequestrating pollutants, however, its effects on biodegradation of organic pollutants and microbial mechanisms behind remains poorly understood. Here, we carried out a microcosm experiment to investigate the effects of six types of straw derived biochar on anaerobic biodegradation of polybrominated diphenyl ethers (PBDEs) in mangrove sediments. The results showed that the reductive debromination was a critical process of PBDE degradation under anaerobic condition. The reductive debromination efficiency was significantly enhanced after the addition of rice straw and corn straw biochar prepared at relatively low temperatures (C300, C400 and R300), but was inhibited by rice straw biochar produced at high temperatures (R500), indicating that the biochar effects on PBDE degradation depended on its pyrolysis temperature and straw type. The stimulatory effects of C300, C400 and R300 may be attributed to the increased abundance of organohaliderespiring bacteria (OHRB), especially genera  Dehalogenimonas , and the high diversity of typical OHRB in family  Dehalococcoidaceae . In addition, biochar addition significantly altered the bacterial community compositions, in particular, several OHRB genera were enriched by C300, C400 and R300, facilitating the anaerobic biodegradation of BDE-47 in contaminated sediments. These results will help us to understand the potential of biochar amendment for contaminated remediation.

iop conference series. earth and environmental science

Effects of Six Types of Straw Derived Biochar on Anaerobic Biodegradation of Polybrominated Diphenyl Ethers in Mangrove Sediments: A Microcosm Experiment