해양퇴적토에 오염된 고분자 PAHs의 부내력 증진을 위한 UV와 생물분해의 동시적용

Abstract

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, Novosphingobium 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 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 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 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.