期刊
BIORESOURCE TECHNOLOGY
卷 193, 期 -, 页码 274-280出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.06.110
关键词
Polycyclic aromatic hydrocarbons (PAHs); Extracellular polymeric substances (EPS); Biofilms; Biodegradation
资金
- National Key Basic Research Program of China [2014CB441105]
- Specific Fund for Agro-Scientific Research in the Public Interest of China [201203045]
- National Natural Science Foundation of China [21277148]
The hypothesis that extracellular polymeric substances (EPS) affect the formation of biofilms for subsequent enhanced biodegradation of polycyclic aromatic hydrocarbons was tested. Controlled formation of biofilms on humin particles and biodegradation of phenanthrene and pyrene were performed with bacteria and EPS-extracted bacteria of Micrococcus sp. PHE9 and Mycobacterium sp. NJS-P. Bacteria without EPS extraction developed biofilms on humin, in contrast the EPS-extracted bacteria could not attach to humin particles. In the subsequent biodegradation of phenanthrene and pyrene, the biodegradation rates by biofilms were significantly higher than those of EPS-extracted bacteria. Although, both the biofilms and EPS-extracted bacteria showed increases in EPS contents, only the EPS contents in biofilms displayed significant correlations with the biodegradation efficiencies of phenanthrene and pyrene. It is proposed that the bacterial-produced EPS was a key factor to mediate bacterial attachment to other surfaces and develop biofilms, thereby increasing the bioavailability of poorly soluble PAH for enhanced biodegradation. (C) 2015 Published by Elsevier Ltd.
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