Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
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Enhancing the Intrinsic Bioremediation of PAH-Contaminated Anoxic Estuarine Sediments with Biostimulating Agents

  • Bach Quang-Dung (Department of Environmental Engineering and Biotechnology, Myongji University) ;
  • Kim Sang-Jin (Microbiology Lab., Korea Ocean Research and Development Institute) ;
  • Choi Sung-Chan (Department of Environmental Sciences and Biotechnology, Hallym University) ;
  • Oh Young-Sook (Department of Environmental Engineering and Biotechnology, Myongji University)
  • Published : 2005.08.01
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Abstract

Estuarine sediments are frequently polluted with hydrocarbons from fuel spills and industrial wastes. Polycyclic aromatic hydrocarbons (PAHs) are components of these contaminants that tend to accumulate in the sediment due to their low aqueous solubility, low volatility, and high affinity for particulate matter. The toxic, recalcitrant, mutagenic, and carcinogenic nature of these compounds may require aggressive treatment to remediate polluted sites effectively. In petroleum-contaminated sediments near a petrochemical industry in Gwangyang Bay, Korea, in situ PAH concentrations ranged from 10 to 2,900 ${\mu}g/kg$ dry sediment. To enhance the biodegradation rate of PAHs under anaerobic conditions, sediment samples were amended with biostimulating agents alone or in combination: nitrogen and phosphorus in the form of slow-release fertilizer (SRF), lactate, yeast extract (YE), and Tween 80. When added to the sediment individually, all tested agents enhanced the degradation of PAHs, including naphthalene, acenaphthene, anthracene, fluorene, phenanthrene, fluoranthene, pyrene, chrysene, and benzo [a] pyrene. Moreover, the combination of SRF, Tween 80, and lactate increased the PAH degradation rate 1.2-8.2 times above that of untreated sediment (0.01-10 ${\mu}g$ PAH/ kg dry sediment/day). Our results indicated that in situ contaminant PAHs in anoxic sediment, including high molecular weight PAHs, were degraded biologically and that the addition of stimulators increased the biodegradation potential of the intrinsic microbial populations. Our results will contribute to the development of new strategies for in situ treatment of PAH-contaminated anoxic sediments.

Keywords

References

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