Effects of operating conditions on membrane charge property and nanofiltration

Abstract

The effects of the operating pressure, cross flow velocity, feed concentration, and temperature on the streaming and Zeta potential of the membranes were studied. The permeate flux and the retention rate under different nanofiltration operating conditions were also investigated. The results show that the higher pressure, feed concentration, temperature, and lower cross flow velocity lead to the higher absolute value of streaming and Zeta potential. The permeate flux of the nanofiltration decreases with the feed concentration and increases with not only the pressure but also the cross flow velocity and temperature. The higher the pressure and the cross flow velocity, the higher the retention rate. The lower feed concentration and higher temperature leads to lower retention rate. The effects of the operating conditions on the permeate flux and the retention rate were explained by the variation of the membrane charge property.

Key words： nanofiltration membrane; streaming potential; Zeta potential; permeate flux; retention rate

Acknowledgments

The authors would like to thank Professor Yuxin Wang for his encouragement and useful guidance, and Yue Zhang, Zhi Guo and Wei Li for their sincerely assistance. The authors also thank the Natural Science Foundation of Tianjin (10JCYBJC04900) for financial assistance.

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