The impact of sodium hydroxide, which is one of chemicals of clean in place (CIP) for removing membrane fouling, on the PVDF membrane is reviewed with respect to physical/chemical structural change, the permeability affected therefrom. Based on the cleaning concentration applied in membrane water treatment facilities, 10% of accumulated defluorination was confirmed up to 166g.hr/L which reflects the exposure time. However, membrane resistance was confirmed to be reduced by about 10%. Through FT-IR and EDS analysis, reduction of F and change of are confirmed as factors that affect the permeability of membrane. Membrane resistance, which affects permeability, is affected by loss of additives for hydrophilicity, rather than defluorination of PVDF material. Therefore, in order to check membrane degradation degree, an accelerated test by NaOH was carried out, loss of additives was confirmed, and then PVDF inherent characteristic was observed.

ABSTRACT
 1. 서 론
 2. 재료 및 실험방법
  2.1 분리막 및 실험장치
  2.2 노출 강도 실험 조건
  2.3 막여과저항
  2.4 화학특성
 3. 결과 및 고찰
  3.1 분리막 표면 형상
  3.2 분리막 화학적 성상
  3.3 막여과저항
 4. 결 론
 References

• 이용수(한양대학교, 건설환경공학과) | Yong-Soo Lee (Department of Civil and Environmental Engineering, Hanyang University)
• 강하영(한양대학교, 건설환경공학과) | Ha-Young Kang (Department of Civil and Environmental Engineering, Hanyang University)
• 김우하((주)제일엔지니어링종합건축사사무소, 상하수도사업부) | Woo-Ha Kim (Water Supply & Sewerage Business Div., Cheil Engineering co., Ltd.)
• 이창규(한양대학교, 건설환경공학과, (주)RED) | Chang-Kyu Lee (Department of Civil and Environmental Engineering, Hanyang University, Research Engineering Development Inc)
• 김종오(한양대학교, 건설환경공학과) | Jong-Oh Kim (Department of Civil and Environmental Engineering, Hanyang University) Corresponding author