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Modeling of permeate flux and mass transfer resistances in the reclamation of molasses wastewater by a novel gas-sparged nanofiltration

  • Separation Technology, Thermodynamics
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Abstract

A semi-empirical model has been applied to predict the permeate flux and mass transfer resistances during the cross flow nanofiltration of molasses wastewater in flat-sheet module. The model includes laminar flow regime as well as flow in presence of gas sparging at two different gas velocities. Membrane hydraulic resistance (R m ), osmotic pressure resistance (R osm ) and the concentration polarization resistance (R cp ) were considered in series. The concentration polarization resistance was correlated to the operating conditions, namely, the feed concentration, the trans-membrane pressure difference and the cross flow velocity for a selected range of experiments. There was an appreciable reduction of concentration polarization resistance R spar cp in presence of gas sparging. Both the concentration polarization resistance R lam cp and osmotic pressure resistance R osm decreased with cross-flow velocity, but increased with feed concentration and the operating pressure. Experimental and theoretical permeate flux values as a function of cross flow velocity for both the cases, in the presence and absence of gas sparging, were also compared.

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Authors and Affiliations

  1. Department of Chemical Engineering, G H Patel College of Engineering & Technology, Vallabh Vidyanagar, 388 120, Gujarat, India

    Tejal Manish Patel & Kaushik Nath

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  1. Tejal Manish Patel
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  2. Kaushik Nath
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Correspondence to Kaushik Nath.

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Patel, T.M., Nath, K. Modeling of permeate flux and mass transfer resistances in the reclamation of molasses wastewater by a novel gas-sparged nanofiltration. Korean J. Chem. Eng. 31, 1865–1876 (2014). https://doi.org/10.1007/s11814-014-0139-7

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  • DOI: https://doi.org/10.1007/s11814-014-0139-7

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