Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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A Study on the high-flux MBR system using PTFE flat membrane and coagulant(Alum) for removal of phosphorus

PTFE재질의 평판형 분리막과 인제거를 위해 Alum주입을 적용한 고플럭스 MBR시스템에 관한 연구

  • 이의종 (성균관대학교 건설환경시스템공학과 환경공학연구실) ;
  • 김관엽 (성균관대학교 건설환경시스템공학과 환경공학연구실) ;
  • 권진섭 (성균관대학교 건설환경시스템공학과 환경공학연구실) ;
  • 김영훈 (성균관대학교 건설환경시스템공학과 환경공학연구실) ;
  • 이용수 (성균관대학교 건설환경시스템공학과 환경공학연구실) ;
  • 이창하 (성균관대학교 건설환경시스템공학과 환경공학연구실) ;
  • 전민정 (성균관대학교 건설환경시스템공학과 환경공학연구실) ;
  • 김형수 (성균관대학교 건설환경시스템공학과 환경공학연구실) ;
  • 김정래 (효성에바라엔지니어링(주)) ;
  • 정진호 (성균관대학교 건설환경시스템공학과 환경공학연구실)
  • Published : 2011.02.15
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Abstract

Even though MBR processes have many advantages such as high quality effluents, a small footprint and convenience for operation compared to conventional activated sludge processes, there are some shortcomings in terms of the cost and potential fouling incident that keeps MBR (Membrane bioreactor) processes from being widely applied. To reduce these problems, PTFE (Polytetrafluoroethylene) flat sheet membranes that have excellent permeability and durability were tested instead of PVDF (Polyvinylidene fluoride) membrane which is being used widely in water treatment. Low concentration of sodium hydroxide (NaOH) was also added into the membrane modules in order to prevent the membrane fouling as well as to provide the alkalinity. With conditions mentioned above, a pilot-scale MBR system based on the MLE (Modified Ludzack Ettinger) process was operated at flux of 40 $L/m^{2}/hr$ and over 15,000 mg/L MLSS concentration for about 8 months. And coagulant(alum) was added into the membrane tank to remove phosphorus. Although the more coagulant is added the more effectively phosphorus is removed, that can lead to fouling for a long operation(Ronseca et al.,2009). By the way there is a research that fouling grow up after stopping injection of coagulant(Holbrook, 2004). Stable operation of MBR systems was achieved without major chemical cleaning and the effluent quality was found to be good enough to comply with the treated waste water quality regulations of the Korea.

Keywords

References

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