i am making a prototype for RO desalination system and want to know the least pressure for effective freshh water production, and at that pressure what is the flow rate per unit area of the membrane?
and if you can give further articles or papers.
I think you can get some information from RO membrane makers.
You may find some from below link.
http://www.lgwatersolutions.com/?page_id=17
You must know the feed seawater condition and the feed after chemical pretreatment from SDI, pH, TDS, and the temperature. Then you can choose the appropriate type of membranes. The least pressure, is the pressure just greater than the net driving pressure (which depends on the feed TDS).
The least mechanical pressure for RO process is about 1 MPa.
You can check it in this book:
Cipollina, A., Micale, G., and Rizzuti, L., "Seawater Desalination: Conventional and Renewable Energy Processes", Springer Berlin Heidelberg, 2009.
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