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Separation in a liquid medium? Orelis Environnement SAS 382, avenue du Moulinas 30340 Salindres France Phone : +33 (0)4 66 85 95 36 Fax : +33 (0)4 66 30 77 59 [email protected] www.orelis.com Microfiltration, ultrafiltration, nanofiltration and reverse osmosis can be defined as crossflow separation processes in liquid phase by permeation through membranes under the action of a pressure gradient. Membrane acts as a barrier between two media. It allows some mass transfer and not allow others or, less restrictive, in some favors. These processes can be considered as filtration processes in a liquid medium that implement the membranes with pore diameters gradually decrease the micrometer (1 mm = 10-6 m) to nanometer (1 nm = 10-9 m) in the transition microfiltration, ultrafiltration, nanofiltration and then, finally, to reverse osmosis. Page 2 Information given for educational SW001 – Separation in a liquid medium D L E Extracts of the C.E.A. review Plane Pleiade® Spiral wound Persep™ Ceramic Kleansep™ Orelis Environment provides the full range of membranes Information given for educational SW001 – Separation in a liquid medium D L E Page 3 Pore diameter Typical retention Reverse Osmosis Nanofiltration Ultrafiltration Microfiltration < 0.5 nm (*) ~1nm 1 – 100 nm 0.1 – 10µm Salt small molecules (molecular weight below 300g/mol) Macromolecules colloids Particles colloids See cut-off Page 4 Information given for educational SW001 – Separation in a liquid medium D L E Extracts of the C.E.A. review Organics Macromolecules Organic compounds Colloid, emulsions Bacteria Virus Dissolved salts Yeast 10 microns 1 0,1 0,01 0,001 0,0001 Salts Bacteria Virus Reverse Osmosis PERSEP™ Nanofiltration KLEANSEP™, PERSEP™ Microfiltration KLEANSEP™, PERSEP™ Ultrafiltration PLEIADE®, PERSEP®, KLEANSEP™ Page 5 Information given for educational SW001 – Separation in a liquid medium D L E Red blood cell