Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Ammonia Removal Characteristics in Membrane Contactor System Using Tubular PTFE Membrane

관형 PTFE 분리막을 이용한 막 접촉기(Membrane Contactor) 시스템에서 암모니아의 제거 특성

  • Ahn, Yong-Tae (Department of Civil and Environmental Engineering, Pennsylvania State University) ;
  • Hwang, Yu-Hoon (Department of Civil and Environmental Engineering, KAIST) ;
  • Shin, Hang-Sik (Department of Civil and Environmental Engineering, KAIST)
  • 안용태 (펜실바니아 주립대학교 토목환경공학과) ;
  • 황유훈 (한국과학기술원 건설및환경공학과) ;
  • 신항식 (한국과학기술원 건설및환경공학과)
  • Received : 2011.04.14
  • Accepted : 2011.05.27
  • Published : 2011.05.31
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Abstract

In this study, ammonia removal characteristics in membrane contactor system under various operating conditions were evaluated. The mass transfer coefficient was used to quantitatively compare the effect of various operation conditions on ammonia removal efficiency. Effective removal of ammonia was possible with the tubular PTFE membrane contactor system at all tested conditions. Among the various operation parameters, contact time and solution pH showed significant effect on ammonia removal mechanism. Overall ammonia removal rate was not significantly affected by influent suspended solution concentration unlike other pressure driven membrane filtration processes. Also the osmotic distillation phenomena which deteriorate the mass transfer efficiency can be minimized by preheating of strip solution. Membrane contactor system can be a possible alternative to treat high strength nitrogen wastewater by optimizing operation conditions such as stripping solution flow rate, influent wastewater temperature, and influent pH.

본 연구에서는 막 접촉기에서 운전조건에 따른 암모니아 제거 특성에 대해 알아보았다. 물질 전달 계수를 이용하여 각 조건에서의 암모니아 제거효율을 정량적으로 비교하였다. PTFE 재질의 막을 이용한 본 시스템에서 빠른 시간 내에 효율적으로 암모니아 탈기가 가능하였다. 여러 가지 운전조건 항목 중에서 접촉시간과 용액의 pH가 전체 제거 효율에 가장 큰 영향을 미치는 것으로 나타났다. 다른 가압 방식의 막 분리 공정과는 다르게 본 공정에서는 유입수의 고형물질에 의해 효율이 감소하는 현상은 발견되지 않았다. 또한, 삼투 증류(osmotic distillation)에 의해 물질 전달 효율이 감소하는 현상은 흡수용액의 온도를 증가시키는 것으로 해결할 수 있었다. 본 연구에 사용한 막 접촉기 시스템은 유입수와 흡수용액(stripping solution)의 유속, 유입수의 pH 등을 최적화 할 경우에 고농도 암모니아 제거에 효과적으로 사용할 수 있을 것이라 예상된다.

Keywords

References

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