Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Analysis of Membrane Integrity and Removal Efficiency Considering Membrane Defect and Pore Size

막 파단 및 공극크기에 따른 막 완결성 및 제거효율 분석

  • Hur, Hyun-chul (Watertreatment section, Waterworks Research Institute, Seoul Metropolitan Government) ;
  • Rhee, Ok-jae (Watertreatment section, Waterworks Research Institute, Seoul Metropolitan Government) ;
  • Lee, Kwang-jae (Watertreatment section, Waterworks Research Institute, Seoul Metropolitan Government) ;
  • Kim, Kwang-ho (Watertreatment section, Waterworks Research Institute, Seoul Metropolitan Government) ;
  • Choi, Young-june (Watertreatment section, Waterworks Research Institute, Seoul Metropolitan Government) ;
  • Lee, Joo-hee (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Hong, Seungkwan (Department of Civil, Environmental and Architectural Engineering, Korea University)
  • 허현철 (서울특별시 상수도연구원) ;
  • 이옥재 (서울특별시 상수도연구원) ;
  • 이광제 (서울특별시 상수도연구원) ;
  • 김광호 (서울특별시 상수도연구원) ;
  • 최영준 (서울특별시 상수도연구원) ;
  • 이주희 (고려대학교 건축사회환경공학과) ;
  • 홍승관 (고려대학교 건축사회환경공학과)
  • Received : 2008.04.16
  • Accepted : 2008.06.09
  • Published : 2008.07.30
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Abstract

Microfiltration (MF) and ultrafiltration (UF) processes for removal of particulate materials (i.e., turbidity, microorganisms and viruses) have been used to produce drinking water with higher quality. As membrane filtration technique has become widely applied for drinking water treatment, the importance of membrane integrity test (MIT) has also been increasingly emphasized. The results of pressure decay test (PDT) were presented in the paper to monitor membrane integrity. In this paper the PDT was carried out with deliberately-defected membrane fibers to evaluate the sensitivity of PDT on membrane fiber damage. Variation of pressure decay rate and removal rate were investigated to evaluate the impact of defection (defection ratio) and pore size of membrane. The membrane integrity could be successfully monitored by the PDT. The pressure decay rate varied from $0.002{\sim}0.189kg_f/cm^2hr$ with the initial pressure ranged from 0.2 to $1.0kg_f/cm^2hr$. Higher initial pressure which provided with higher pressure decay rate was preferred to evaluate the defection of membrane fiber. As for the particle removal rate, the Log Removal Rate (LRV) of kaolin solution decreased significantly from 3.78 to 2.31 when one fiber out of 3,200 fibers was cut. The membranes with different pore size were tested to evaluate virus removal efficiency. The virus removal rate of the MF membrane ($0.1{\mu}m$) was about 30% although the poliovirus was smaller than the pore size of the MF membrane, indicating that the removal rate was much lower than Korea Water Works Association (KWWA) certificate LRV of 1.5.

Keywords

Acknowledgement

Supported by : 환경부

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