대한환경공학회지 (Journal of Korean Society of Environmental Engineers)

  • 제36권12호
  • /
  • Pages.873-878
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  • 2014
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  • 1225-5025(pISSN)
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  • 2383-7810(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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박테리아 제거를 위한 완속 모래여과에서 탄소나노튜브의 적용성 검토

Applicability Assessment of Carbon Nanotube to Slow Sand Filtration for Bacteria Removal

  • 안희경 (한경대학교 지역자원시스템공학과) ;
  • 박성직 (한경대학교 지역자원시스템공학과)
  • An, Hee-Kyung (Department of Bioresources & Rural systems Engineering, Hankyong National University) ;
  • Park, Seong-Jik (Department of Bioresources & Rural systems Engineering, Hankyong National University)
  • 투고 : 2014.09.02
  • 심사 : 2014.12.31
  • 발행 : 2014.12.31
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초록

본 연구에서는 박테리아 제거를 위한 완속모래여과에서 탄소나노튜브(Carbon Nanotube, CNT)의 적용성을 검토하기 위해서 전자현미경 분석 및 칼럼 실험을 수행하였다. CNT의 형태적 특성을 분석하기 위하여, 주사전자현미경으로 분석한 결과 CNT는 박테리아 부착이 용이한 섬유형태로 응집되어 있었다. CNT의 충진 두께, pH, 이온강도를 달리하며 칼럼 실험을 수행하였다. CNT의 충진 두께가 1 cm, 3 cm, 5 cm로 증가할수록 박테리아 제거율이 44.15%에서 99.95%로 증가하는 것으로 나타났다. 반면, pH가 5.5에서 8.5로 증가할 경우 정전기적 반발력에 의해 박테리아 제거율이 감소하는 경향을 보였다. 이온강도를 0 mM에서 50 mM로 증가하여 칼럼 실험을 수행한 경우 박테리아 제거율이 97.25%에서 70.90%로 감소하였다. 본 연구를 통해 CNT가 오염된 물에 함유되어 있는 박테리아를 처리하는 완속모래여과에 적용 가능한 것으로 나타났다.

The applicability of carbon nanotube (CNT) to slow sand filtration for the removal of bacteria was studied using scanning electron microscope and column experiments. The morphology of CNT were investigated using scanning electron microscope and the CNT looked like a skein serving bacteria favorable site for adhesion. Column experiments were performed over a range of CNT filter depth, pH, and ionic strength. Bacteria removal efficiency was found to increase from 44.15% to 99.95% as the CNT filter depth increased from 1 cm to 5 cm, and 3 cm of CNT filter depth was required for significant removal of bacteria. pH increase from 5.5 to 8.5 decreased the bacteria removal efficiency, due to the electrostatic repulsion between bacteria and CNT at higher pH. Bacteria removal efficiency decreased from 97.25% to 70.90% as the ionic strength increased from 0 mM to 50 mM. This study demonstrated that the CNT can be applied to slow sand filtration for treating microbially contaminated water.

키워드

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