Journal of the Korean Society of Mineral and Energy Resources Engineers (한국자원공학회지)

The Korean Society of Mineral and Energy Resources Engineers (한국자원공학회)
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Column Experiments on Removal of Dissolved Arsenic Using Microorganism and Nano-sized Pd-Akaganeite Particles

미생물과 Pd-Akaganeite 나노입자를 이용한 용존 비소 제거를 위한 컬럼 실험 연구

  • 김현철 (전남대학교 에너지자원공학과) ;
  • 이종운 (전남대학교 에너지자원공학과) ;
  • 노열 (전남대학교 지구환경과학부) ;
  • 심연식 (한국광해관리공단)
  • Published : 2011.10.31
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Abstract

The effects of microorganism (Clostridium sp.), nano-sized Pd-akaganeite particles, and mixture of the microorganism and the nanoparticles on the removal of dissolved As(III) were investigated through experiments using the columns filled with glass beads. The concentrations of dissolved arsenic in the column effluents after 32-day experiments showed that the removal efficiencies were 10.6%, 13.2%, 28.3%, and 83.8% for control, microbial, nanoparticles, and mixture columns, respectively. Injection of the mixture of microbe and nanoparticles to the column led to the highest removal of the dissolved arsenic, and the result was likely due to microbial formation of nano-sized magnetite after reduction of Fe(III) in akaganeite to Fe(II) and subsequent adsorption of dissolved arsenic onto the magnetite. However, the removed arsenic partly appeared to be adsorbed onto colloidal suspensions in the mixture column, which may enhance the potential of arsenic transport for a long distance in groundwater aquifer.

대수층을 모사하기 위하여 컬럼을 유리 비드(bead)로 충진한 후 3가 비소 용액을 통과시키며 각 컬럼에 미생물(Clostridium sp.), Pd-akaganeite 나노입자, 미생물과 나노입자 혼합물을 주입하였다. 총 32일에 걸쳐 삼출수 내 비소 농도를 측정하여 주입물에 의한 용존 비소 저감 효과를 비교한 결과, 비교(control) 컬럼, 미생물 주입 컬럼, 나노입자 주입 컬럼, 미생물과 나노입자 주입 컬럼 삼출수 내에서 각각 10.6%, 13.2%, 28.3%, 83.8%의 저감 효과를 보였다. 다른 컬럼과 비교하였을 때 미생물과 나노입자를 동시에 주입한 경우 매우 높은 저감 효과를 보임으로써 용존 비소 제거에 가장 효과적인 방법으로 나타났다. 용존 비소의 증진된 저감 효과는 미생물에 의해 akaganeite 내 3가 철이 2가 철로 환원되며 자철석(magnetite) 나노입자를 형성하고 용존 비소가 이에 흡착되었기 때문으로 보인다. 그러나 미생물과 나노입자를 주입한 경우 저감된 비소 중 일부는 유리 비드 표면에 고정화된 것보다는 콜로이드에 흡착된 상태로 나타나 지하수 흐름을 따라 이동 거리가 길어질 가능성도 있다.

Keywords

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