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Pilot scale concentration of cheese whey by forward osmosis: A short-cut method for evaluating the effective pressure driving force

Artemi, Anna, Chen, George Q., Kentish, Sandra E. and Lee, Judy (2020) Pilot scale concentration of cheese whey by forward osmosis: A short-cut method for evaluating the effective pressure driving force Separation and Purification Technology, 250, 117263.

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Cheese whey was concentrated to a concentration factor of 2.7 in a pilot scale forward osmosis filtration system, using a commercial cellulose triacetate membrane in a spiral-wound configuration. The whey was concentrated in a batch mode, using sodium chloride as the draw solution at initial osmotic pressures of 53–75 bar. During the process, flux was shown to reduce due to the simultaneous decrease in the bulk osmotic pressure of the draw solution, increase in the bulk osmotic pressure of the whey and the effect of concentration polarisation on both sides of the membrane. The flux is known to be driven by the effective osmotic pressures of whey and the draw solution on the surface of the membrane active layer. A short-cut approach that requires minimal information in advance about the osmotic pressure of whey and the geometry of the filtration system was implemented, enabling the determination of these effective osmotic pressures. The results obtained were shown to be in agreement with the fundamental forward osmosis flux model. The short-cut approach can be utilised for estimating effective osmotic pressures of other liquid food streams to be concentrated by forward osmosis, without the need of external measurements.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
Chen, George Q.
Kentish, Sandra E.
Date : 20 June 2020
Funders : High Weald Dairy, Holchem Laboratories Ltd, Dairy Innovation Hub
DOI : 10.1016/j.seppur.2020.117263
Copyright Disclaimer : © 2020 Elsevier B.V. All rights reserved.
Uncontrolled Keywords : Forward osmosis; Pilot scale; Whey concentration; Osmotic pressure; Concentration polarisation;
Additional Information : Embargo OK Metadata OK No Further Action
Depositing User : James Marshall
Date Deposited : 17 Jul 2020 13:10
Last Modified : 17 Jul 2020 13:10

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