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The Membrane Society of Korea (한국막학회)
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Preparation of PVdF/GO Composite Nanofibrous Flat Membrane and its Permeation Characteristics in Activated Sludge

PVdF/GO 복합 나노섬유 평막의 제조 및 활성슬러지 내 투과특성

  • Won, In Hye (Department of Chemical and Biomolecular Engineering, Seoul National University of Science and Technology) ;
  • Jang, Wongi (Department of Chemical System Engineering, Keimyung University) ;
  • Chung, Kun Yong (Department of Chemical and Biomolecular Engineering, Seoul National University of Science and Technology) ;
  • Byun, Hongsik (Department of Chemical System Engineering, Keimyung University)
  • 원인혜 (서울과학기술대학교 화공생명공학과) ;
  • 장원기 (계명대학교 화학시스템 공학과) ;
  • 정건용 (서울과학기술대학교 화공생명공학과) ;
  • 변홍식 (계명대학교 화학시스템 공학과)
  • Received : 2015.02.09
  • Accepted : 2015.02.22
  • Published : 2015.02.28
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Abstract

In this study the nanofiber was prepared by electrospinning method with polyvinylidene fluoride (PVdF) and a completely dispersed solution of graphene oxide (GO) in the mixed solvent of dimethylformamide (DMF) and acetone. The $0.4{\mu}m$ pore size microfiltration flat membrane was made by increasing layers of the PVdF/GO composite nanofiber. Also, transmembrane pressure (TMP) was measured in order to evaluate fouling of the PVdF/GO composite membrane which was introduced GO reducing biological fouling with the intrinsic antibacterial characteristics. The permeate experiments were carried out simultaneously for the PVdF/GO and commercialized CPVC (chlorinated polyvinyl chloride) flat membranes with $0.01m^2$ effective area in the activated sludge solution of MLSS 4,500 mg/L. TMP of PVdF/GO membrane decreased up to 79% lower than that of CPVC for $10L/m^2{\cdot}h$ permeate flux without air supply. Also, for the case of run/stop operational mode, TMP of PVdF/GO membrane decreased up to 69% lower than that of CPVC for $10L/m^2{\cdot}h$.

본 연구에서는 dimethylformamide (DMF)와 acetone의 혼합용액에 산화그래핀(graphene oxide, GO)을 분산시키고 기질 고분자인 PVdF (polyvinylidene fluoride)를 도입하여 전기방사법으로 나노섬유를 제조하였다. 또한 PVdF/GO 복합 나노섬유를 평막 형태로 적층시켜 기공크기 $0.4{\mu}m$인 정밀여과막을 제조하였다. 그리고 GO의 고유한 항균 특성으로 생물학적 오염을 줄일 수 있는 PVdF/GO 복합막의 막오염을 평가하기 위하여 막간 압력차(transmembrane pressure, TMP)를 측정하였다. 유효 막면적이 $0.01m^2$인 PVdF/GO 평막과 상용화된 MBR용 CPVC (chlorinated polyvinyl chloride) 평막을 MLSS 4,500 mg/L인 활성슬러지 수용액 내에서 동시에 투과 실험하였다. 공기를 주입하지 않을 경우, 투과유속이 $10L/m^2{\cdot}h$일 때 PVdF/GO 막의 TMP는 CPVC 막의 최대 79%까지 감소하였다. 또한 운전/휴직 방식으로 운전할 경우, $10L/m^2{\cdot}h$일 때 PVdF/GO 막의 TMP는 CPVC 막의 최대 69%까지 감소함을 확인하였다.

Keywords

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