Article | REF: J2789 V1

Membrane filtration (IO, NF, UF, MF) - Theoretical aspects: transfer mechanisms

Authors: Pierre AIMAR, Patrice BACCHIN, Alain maurel

Publication date: February 10, 2010, Review date: June 1, 2023

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ABSTRACT

This article analyzes the transfer mechanisms that occur during the reverse osmosis (RO), nanofiltration (NF), ultrafiltration (UF) and microfiltration (MF). These methods of liquid-phase separation by permeation through permselective membranes under the action of a pressure gradient involve complex phenomena. The purpose of this theoretical presentation is to enable the user to achieve a better understanding of each of these techniques in order to at best optimize their implementation.

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AUTHORS

  • Pierre AIMAR: Chemical Engineering Laboratory UMR CNRS/INP/UPS Paul Sabatier University (Toulouse)

  • Patrice BACCHIN: Chemical Engineering Laboratory UMR CNRS/INP/UPS Paul Sabatier University (Toulouse)

  • Alain maurel: Consultant

 INTRODUCTION

The aim of this dossier [J 2789] is to analyze the transfer mechanisms involved in membrane filtrations such as :

  • OI reverse osmosis;

  • nanofiltration NF ;

  • UF ultrafiltration;

  • MFT microfiltration;

so that the user can identify the most limiting transfer mechanisms for a given application, and understand the influence of operating conditions on process operation.

After a few general points, we present the theoretical considerations required to analyze the transfer mechanisms that determine process operation: filtration speed, material accumulation and selectivity. This dossier forms the theoretical basis on which the [J 2 790v2] dossier is based, providing the theoretical tools required for process design and optimization. In simplified terms, this file presents the cause of the phenomena (the transfer mechanisms involved), while the [J 2 790v2] file presents the consequences of these phenomena on process efficiency (permeability and selectivity).

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Membrane filtration (RO, NF, UF, MFT)