Article | REF: J2790 V3

Membrane filtration (IO, NF, UF, MF) - Theoretical aspects: permeability and selectivity

Authors: Pierre AIMAR, Patrice BACCHIN, Alain maurel

Publication date: August 10, 2010, Review date: March 20, 2024 | Lire en français

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1. Process efficiency

The objective of the user of a membrane process is twofold: to ensure maximum productivity (permeation) in order to minimize operating costs, while at the same time achieving an efficiency (selectivity) that meets the set constraints. Process permeation and selectivity are therefore at the heart of membrane process optimization.

1.1 Permeation: volume flow density

The volume flow rate per unit area (or volume flow density or permeation flow rate) is the ratio of the permeation flow rate to the membrane surface area:

J = \frac{Q_{P}}{S}

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Permeability: concentration polarization and clogging

Bibliography

(1) - MERTEN (U.) - Desalination by reverse osmosis. - MIT Press Cambridge (1966).
(2) - VILKER (V.L.), COLTON (C.K.), SMITH (K.A.), GREEN (D.L.) - The osmotic pressure of concentrated protein and lipoprotein solutions and its significance to ultrafiltration....