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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received February 23, 2014
Accepted May 13, 2014

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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

Tejal Manish Patel Kaushik Nath^†

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

Korean Journal of Chemical Engineering, October 2014, 31(10), 1865-1876(12), 10.1007/s11814-014-0139-7

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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 (Rm), osmotic pressure resistance (Rosm) and the concentration polarization resistance (Rcp) were considered in series. The concentration_x000D_ 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 Rcp spar in presence of gas sparging. Both the concentration polarization resistance Rcp lam and osmotic pressure resistance Rosm 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.

Keywords

Membrane Nanofiltration Flux Molasses Gas Sparging Cross Flow Velocity

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