期刊
ENVIRONMENTAL POLLUTION
卷 313, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2022.120192
关键词
Bioaugmentation; Biosurfactant; Natural attenuation; Pyrene-degrading bacteria; RNA-SIP
资金
- National Natural Science Foundation of China [31670510]
- Technology Innovation Centre for Land Engineering and Human Settlements
- Shaanxi Land Engineering Construction Group Co., Ltd
- Xian Jiaotong University [201912131]
Bioaugmentation aided by biosurfactant is an effective method for removing pyrene from contaminated sites. This process accelerates pyrene degradation and increases the diversity of active pyrene-degrading bacteria.
Bioaugmentation is an effective approach for removing pyrene from contaminated sites, and its performance is enhanced by a biosurfactant. To reveal the mechanisms of biosurfactant-assisted bioaugmentation, we intro-duced RNA stable isotope probing (RNA-SIP) in the pyrene-contaminated soils and explored the impacts of rhamnolipid on the pyrene degradation process. After 12-day degradation, residual pyrene was the lowest in the bioaugmentation treatment (7.76 symbolscript 1.57%), followed by biosurfactant-assisted bioaugmentation (9.86 symbolscript 2.58%) and enhanced natural attenuation (23.97 symbolscript 1.05%). Thirteen well-known and two novel pyrene-degrading bacteria were confirmed to participate in the pyrene degradation. Pyrene degradation was accelerated in the biosurfactant-assisted bioaugmentation, manifested by the high diversity of active pyrene degraders. Our find-ings expand the knowledge on pyrene degrading bacteria and the mechanisms of pyrene degradation in a bio-augmentation process.
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