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Membranes 2018, 8(3), 46; https://doi.org/10.3390/membranes8030046

Concentration Polarization in Ultrafiltration/Nanofiltration for the Recovery of Polyphenols from Winery Wastewaters

1
Post-Graduation Program in Mining, Metallurgical and Materials Engineering (PPGE3M), Federal University of Rio Grande Do Sul (UFRGS), Av. Bento Gonçalves 9500, Porto Alegre 91.509-900, Brazil
2
Chemical Engineering Department, Instituto Superior Técnico (IST), University of Lisbon, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
3
Urban Water Division, Hydraulics and Environment Department, National Civil Engineering Laboratory, Av. Brasil 101, 1700-066 Lisbon, Portugal
*
Author to whom correspondence should be addressed.
Received: 22 June 2018 / Revised: 9 July 2018 / Accepted: 18 July 2018 / Published: 21 July 2018
(This article belongs to the Special Issue Fouling and Cleaning in Membrane Processes)
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Abstract

Concentration polarization is intrinsically associated with the selective character of membranes and often means flux decline and which causes a subsequent decrease of ultrafiltration and nanofiltration performance. More important is the fact that it acts as a precursor of membrane fouling and creates severe fouling problems in the longer times range. The quantification of its dependence on the operating parameters of cross-flow velocities and transmembrane pressures makes recourse to the film theory to introduce mass-transfer coefficients that generally are calculated by dimensionless correlations of the Sherwood number as a function of the Reynolds and Schmidt numbers. In the present work, the mass-transfer coefficients are obtained through the fitting of experimental results by the pressure variation method. The ultrafiltration/nanofiltration of the winery wastewaters from the racking operation is carried out with the membranes ETNA 01PP (Alfa Laval) and NF 270 (Dow Filmtec) under a wide range of cross-flow velocities and transmembrane pressures up to 15 bar. View Full-Text
Keywords: concentration polarization; ultrafiltration; nanofiltration; winery wastewater; polyphenols recovery concentration polarization; ultrafiltration; nanofiltration; winery wastewater; polyphenols recovery
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Giacobbo, A.; Moura Bernardes, A.; Filipe Rosa, M.J.; de Pinho, M.N. Concentration Polarization in Ultrafiltration/Nanofiltration for the Recovery of Polyphenols from Winery Wastewaters. Membranes 2018, 8, 46.

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