Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 176, Issue 1-3, Pages 41-47Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2009.10.123
Keywords
PAHs biodegradation; Indigenous consortia; Microbial activity; Sequential utilization; Two-liquid-phase bioreactor
Categories
Funding
- National High Technology Research and Development Program of China [2007AA061101]
- National Natural Science Foundation of China and Jiangsu [40921061, 20707028, BK2007264]
- Innovative project of Chinese Academy of Sciences [ISSASIP0714]
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Estimation of PAHs degradation potential of indigenous consortia is essential for remediation of polluted soils. In this study, the biodegradation of a mixture of 11 PAHs was compared using a long-term PAH-contaminated soil (CS) and an unpolluted agricultural soil (AS) as inocula in a two-liquid-phase bioreactor (TLPB). In the TLPB, silicone oil was used as the organic phase to increase the PAHs bioavailability. The microbial numbers were also determined during the biodegradation. The results demonstrated that naphthalene, fluorene, phenanthrene, anthracene, fluoranthene and pyrene could be completely biodegraded in both soils within 4-50 days. With the exception of dibenzo(a,h)anthrancene, the other PAHs including benzo(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene and benzo(k)fluoranthene were degraded to different extents in both soils at the end of 170 days. Complete biodegradation of benzo(a)anthracene and benzo(b)fluoranthene only occurred in CS. During the process, microbial growth was highly correlated to the biodegradation of PAHs. Sequential utilization of PAHs showed a competitive-inhibition in the multi-substrate system. The half-life times of PAHs obtained here were much shorter than those reported previously in soils, indicating that indigenous microbes in both soils had high PAHs degradation potential, facilitated by TLPB. (C) 2009 Published by Elsevier B.V.
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