Flow Reversal and Pressure pulsation: Innovative technique to enhance flux in Nanofiltration

Authors

  • Jigesh Pankaj Mehta Department of Chemical Engineering, School of Engineering, P P Savani University, Kosamba, Gujarat, India

Keywords:

Nanofiltration, Flux, Resistance-in-series model, flow reversal, pressure pulsation

Abstract

Reduction in Permeate flux with the period of time is the major drawback for the Pressure-driven membrane processes. Concentration polarization and membrane fouling are the two major limitations for the Pressure-driven membrane filtration processes. They lead to the severe flux decline and that need to be controlled for the better process efficiency. The resistance determination provides basis for selection of membrane and appropriate pressure –driven separation process. This paper outlines a new approach for the flux enhancement by investigating the two techniques namely flow reversal and pressure pulsation. Resistance –in-series model was applied to quantify and describes the co-relation of the resistances taking into account the membrane hydraulic resistance as a base factor. It is also observed that membrane permeability decreases rapidly due to pore blocking and further declination of the flux is due to graduation accumulation of the foulant over the membrane surface. It is observed that membrane hydraulic resistance, Rm remained constant during the whole experiments while there is a reduction of concentration polarization (CP) resistance, Rcp in case of frequent flow reversal i.e from 52.08 to 35.50 %. However, in pressure pulsation technique not much flux variation was found during pressure pulse at different intervals.

Keywords: Nanofiltration; Flux; Resistance-in-series model; flow reversal; pressure pulsation.

Author Biography

  • Jigesh Pankaj Mehta, Department of Chemical Engineering, School of Engineering, P P Savani University, Kosamba, Gujarat, India
    Department of Chemical Engineering, School of Engineering, P P Savani University, Kosamba, Gujarat, India

References

Ostadfar, A. and Rawicz, A., 2015. Effects of Pulsatile Flow and Backwashing on Plasma Flow Rate in an Implantable Plasmapheresis. I. Theory and Principle. Biomedical Engineering, 49(1), pp.29-32.

Nath, K., 2017. Membrane separation processes. PHI Learning Pvt. Ltd.

Ilias, S., 2005. Flux Enhancement in Crossflow Membrane Filtration: Fouling and It's Minimization by Flow Reversal. North Carolina A&T State University.

Zhang, W., Luo, J., Ding, L. and Jaffrin, M.Y., 2015. A review on flux decline control strategies in pressure-driven membrane processes. Industrial & Engineering Chemistry Research, 54(11), pp.2843-2861.

Mehta, J.P., 2019. Improvement of Permeate flux by Laboratory Scale Techniques in Membrane Separation Processes. Journal of Modern Chemistry & Chemical Technology, 10(1), pp.21-27.

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Published

2019-12-12

Issue

Vol. 6 No. 3 (2019)

Section

Articles

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