Typically ultrafiltration membranes have permeability in the range of (2 to 7)x10^-11 m/Pa.s depending in the MWCO.  In case of microfiltration, it varies from (8 to 30)x10^-11 m/Pa.s depending on the pore size.

Dear Souvar, Can you provide a reference such a book or a paper?

on page 146 of

Handbook of Industrial Membranes, Second edition, by K. Scott, Elsevier Science & Technology Books, 1999

find the attached values

You can also check in manufacture's websites. Normally, one of the parameters they show is membrane permeability refered to water.

Basic Principles of Membrane Technology, Second edition, J. Mulder, Springer Netherlands, 30 de sept. de 1996 - 564 pages

Table in page 17: Flux range and pressures in various pressure driven membrane processes

Dear Magdalena and Ibrahim, exactely what I needed! thanks a lot

Mr. Roberto Floris

Happy to hear this.

My pleasure!

Handbook of Industrial Membranes(Second Edition)

K. Scott

ISBN: 978-1-85617-233-2

Very complete book

Cheryan, Munir. Ultrafiltration and microfiltration handbook. CRC press, 1998.

The pretreatment section of this book has such information:

http://www.amazon.com/Desalination-Engineering-Planning-Nikolay-Voutchkov/dp/0071777156

Typical permeability value of UF membranes can be found in Mulder, Basic Principles of Membrane Technology, 2nd ed, chapter VI pages 294.

Permeability of UF and MF membranes could also be found in

Huisman, I. H., Dutrê, B., Persson, K. M., & Trägårdh, G. (1997) Water permeability in ultrafiltration and microfiltration: Viscous and electroviscous effects. Desalination, 113(1), 9.