Title

Comparison Of Nonhomogeneous And Homogeneous Mass Transfer In Reverse Osmosis Membrane Processes

Keywords

Concentration polarization; Gaussian random vector; Mass transfer coefficients; Membrane active-layer; Nonhomogeneous; Reverse osmosis

Abstract

Reverse osmosis (RO) membranes are pressure driven, diffusion controlled processes. Current diffusion controlled solute mass transfer models assume a homogeneous membrane surface. This study evaluated mass transfer processes assuming mass transport is not a homogeneous process, which is dependent on the thickness variation of the membrane's active layer. Three-dimensional ridge and valley active layer morphologies were created numerically using Gaussian random vectors. A nonhomogeneous solution diffusion model (NHDM) was then developed to account for surface variation through the active layer. NHDM was further modified by incorporating concentration polarization (CP) effects. A comparison of the NHDM and the NHDMCP with the commonly accepted homogeneous solution diffusion model (HSDM) using pilot-scale brackish water RO operating data indicated that the NHDM is more accurate, when the solute concentration in the feed stream is low, while NHDMCP appears to predict better with a high solute feed concentration. © 2013 Balaban Desalination Publications.

Publication Date

1-1-2013

Publication Title

Desalination and Water Treatment

Volume

51

Issue

34-36

Number of Pages

6444-6458

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1080/19443994.2013.822170

Socpus ID

84887068310 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84887068310

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