Correlating ultrafiltration membrane fouling with membrane properties, water quality, and permeate flux

Abstract

The effect of membrane properties, feed water quality, and permeate flux on ultrafiltration (UF) membrane fouling was systematically investigated. Fouling tests were carried out with three types of commercially available UF membrane and a variety of influents. The membrane fouling was assessed by the normalized fouling rate (F₅₀₀). The results showed that the PVDF membrane with smaller contact angle was more resistant to membrane fouling than the PVC membrane. As for feed water parameters, significant correlations were observed between turbidity, total organic carbon, UV₂₅₄, fluorescence intensity, and membrane fouling rates using Pearson Correlation Analysis. This was especially true for hydraulically irreversible fouling rate (F_irr). Moreover, significant correlations between permeate fluxes and membrane fouling rates were observed. With these correlations, the critical flux and critical flux for irreversibility were calculated. It was found that the critical flux is strongly depended on feed water composition rather than membrane properties. Particulate matter, with a size of 0.45–1.2 μm in diameter, was proved to increase the critical flux and critical flux for irreversibility.

Keywords:

• Normalized fouling rate
• Membrane properties
• Feed water quality
• Critical flux
• Critical flux for irreversibility

Acknowledgments

This research was jointly supported by Major Science and Technology Program for Water Pollution Control and Treatment (2012ZX07404-003), Program for New Century Excellent Talents in University (NCET-13-0169), China Postdoctoral Science Foundation funded project (2013M540293), Science and Technology Planning Project of Chancheng District (2013A1044), and the Fundamental Research Funds for the Central University.