해양퇴적토에 오염된 다환방향족탄화수소의 생물정화용 fed-batch 형 생물반응기 개발

Abstract

Polycyclic aromatic hydrocarbons (PAHs) are a toxic environmental pollutant, accumulated usually in marine sediments. Due to the potential hazardous on ecosystem and human, removal of PAHs from sediments has been great concern. In this study, development of ex situ bioremediation technique using fed-batch bioslurry reactor has been conducted for the cleanup of marine sediments polluted by PAHs. Experimental reactor was consisted of original reactor and derivative reactors that were receiving part (1/10 (A) or 1/5 (B) of working volume) of sediment slurry of original reactor after 1 (d1), 2 (d2), and 3 (d3) days incubation. The activity of electron transport system (ETSA) of original reactor was increased from 5.1±0.1 ㎍-O2/㎖/hr after 1 day of incubation to 27.4±0.3 ㎍-O2/㎖/hr after 2-3 days of incubation. ETSA of d2 & d3 reactors was similar to that of original reactor after 2-3 days of incubation. The degradation rate of PAHs was 81.0-92.7% (A) and 85.1-95.4% (B) at d2 & d3 reactors, respectively. The degradation rate of PAHs was increased with the repetition of treatment. The result implies that fed-batch bioslurry reactor was effective for bioremediation of sediments contaminated by PAHs.