The Effect of Operating Conditions on Cross-Flow Ultrafiltration with using Polyethylene Glycol

Polyethylene Glycol을 이용한 Cross-Flow Ultrafiltration에 있어서 운전조건의 영향

  • Yoo, Kun-Woo (Department of Environmental Engineering, Jang-An College) ;
  • Seo, Hyung-Joon (Department of Environmental Engineering, Inha University)
  • 유근우 (장안대학 환경공업과) ;
  • 서형준 (인하대학교 공과대학 환경공학과)
  • Received : 1997.12.16
  • Accepted : 1998.08.21
  • Published : 1998.12.10

Abstract

The objective of this study was to investigate the effect of running time, operating pressure, feed concentration and circulation rate on the permeation flux and the rejection rate in cross-flow ultrafiltration of polyethylene glycol(PEG) solution of molecular weight($M_w$) 8000 and 20000. The membranes used for this study were MWCO(Molecular Weight Cut-off) of 6 K and 20 K. The experiments were performed at the operating pressures of 7, 14 and 28 psi, the circulation rates of 1000 mL/min and 2000 mL/min, and the feed concentration of 100 mg/L and 1000 mg/L. At a constant pressure, the permeation flux and the observed rejection($R_o$) appeared to be approximately constant within the range of running time, 0~480 min. The permeation flux increased with increasing the operating pressure, and it increased with decreasing the feed concentration and decreasing Mw of PEG at a given pressure. On the other hand, $R_o$ decreased slightly with increasing the operating pressure. However, $R_o$ increased with increasing the feed concentration and increasing of $M_w$ of PEG at a given pressure. The variation in circulation rates did not cause any significant influence on the permeation flux. Increasing of circulation rate caused the increase of $R_o$, and $\alpha$ was increased substantially with the decrease of $M_w$ of PEG. The dimensionless parameter. permeability ratio($\alpha$), which was used to investigate flux-pressure behavior, was increased with the increase in circulation rate and operating presure. The value of $\alpha$ was less than 1 in all cases. The estimated intrinsic rejection(R). which was obtained from mass transfer coefficient, was decreased with the increase of operating pressure. However R increased with the increase of linear velocity of feed and $M_w$ of PEG.

Acknowledgement

Supported by : 인하대학교

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