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Author(s): C. Baldasso
S. I. S. Pinto
G. S. Silveira
L. D. F. Marczak
I. C. Tessaro
J. B. L. M. Campos
J. M. Miranda
Title: Membrane characterization based on PEG rejection and CFD analysis
Issue Date: 2015
Abstract: Characterization of membrane pore size by experimentalmethods is usually done by the determination of the rejection ofpolymeric molecules having a range of sizes such as PEG. Theseexperiments are affected by concentration polarization, which canlead to erroneous interpretation of the results, mainly because theconcentration and the permeate flux change along the membranesurface. Additionally, experimental methods alone are insufficientto obtain the membrane pore size. To improve the currentapproach, numerical methods are used to understand mass transport limitations in rejection experiments and to predict the membrane pore size. In the current study, the results show that theultrafiltration membrane has a MWCO of 20 kDa, different fromthe value set by the manufacturer (30 kDa). For the experimentalconditions, concentration dependent viscosity and osmotic pressure do not influence the permeate flow rate or rejection. Moreover, the membrane pore size was found to be 2.59 nm. This valuewas determined comparing rejection values obtained by numerical and experimental results. Numerical analysis is also importantto characterize the flow and mass transport in each point atmembrane surface.
Subject: Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/POCI/EQU/59724/2004/Células híbridas de separação por membranas /Células híbridas de separação por membranas
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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