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To develop the effective and environment-friendly remediation method of PAHs contaminated in marine sediment, the degradation rate of BaP and the Microtox toxicity of BaP degrading intermediates were evaluated by the combinatorial treatment of UV-C and BaP degrading bacteria, Nouosphingobium pentaromativorans, using artificial sediment based on alumina particles, on which BaP was coated. The degradation rates of BaP treated either by UV-C for one day or by bacterial inoculum for two days, were 59% or 78%, respectively. The toxicities of remaining BaP and degrading intermediates were 32% and 12.5%. To enhance the degradation rate of BaP, UV-C irradiation and bacterial degradation were combined. The first microcosm was irradiated by UV-C for one day followed by the bacterial degradation for additional one day and the second has been incubated with bacteria prior to UV-irradiation, The degradation rates in the two microcosms were increased to 94.2~99.6% compared to that of bacterial inoculation only. Toxicity was also decreased to 22~23.5% compared to that of 32%, UV-C irradiation only. The toxic intermediates presumably derived from UV treatment can be reduced by bacteria. It could be applicable as one of the effective and environment-friendly methods for the remediation of PAHs contaminated in marine sediment.

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ABSTRACT
1. Introduction
2. Materials and Method
3. Results
Acknowledgment
References

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UCI(KEPA) : I410-ECN-0101-2009-472-016829679