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폐 금광산 주변 혐기성 퇴적물에서 비소 거동에 미치는 지구미생물학적 영향

Geomicrobiological Effects on Arsenic Behavior in Anaerobic Sediment from Abandoned Gold Mine Area

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주제분류자원공학

초록

폐 금은광산 주변의 비소로 오염된 퇴적물을 대상으로 하여 혐기성 조건에서 탄소원으로 포도당을 주입한 후 비소 지구화학에 미치는 토착 박테리아의 영향을 조사하였다. 연속추출 결과에 의하면 퇴적물 내 비소는 주로 철과 결합하거나 잔류상으로 존재하는 것으로 나타났다. 14일에 걸친 반응 결과, 토착 박테리아는 용존 Fe2+ 함량을 증가시켰다. 그러나 용존 비소의 함량은 감소하였으며 이는 박테리아에 의한 황산이온 환원에 의해 비소가 황화물을 형성하며 침전하였기 때문으로 판단되었다. 이러한 결과는 박테리아에 의한 비소의 지하 심부 현장 고정화 기법이 실제적으로 적용 가능할 수 있음을 나타낸다.서론

Abstract

Indigenous bacterial mediation of As geochemistry in As-contaminated sediment from an abandoned Au-Ag mine area was investigated after biostimulation with glucose as a carbon source under anaerobic condition. According to the result of sequential extraction analysis, arsenic mainly existed as Fe-associated and residual fractions in the sediment. After 14-day incubation, the indigenous bacteria increased the amount of dissolved Fe2+ with time. However, dissolved As diminished with time likely due to the production of As sulfide(s) and subsequent precipitation, which resulted from bacterial reduction of SO42-. The results implied that bacterial in-situ stabilization of As in subsurface has a potential to be practically applied.

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