Hybrid reverse osmosis — ultrafiltration membranes

✍ Scribed by S.B. Sachs; E. Zisner; G. Herscovici

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 725 KB
• Volume: 18
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/s0011-9164(00)84096-5

✦ Synopsis

A new group of asymmetric non-cellulosic membranes having a performance intermediate between that of a conventional RO membrane and an ultrafilter has been developed. Its main characteristics are high fluxes (4-IO m 3/m 2 day) at low pressures (6-10 at) and moderate rejections for various salts . From 200 mg/I solutions of NaNQ3, Na_SO, and KH Z PQ t rejections up to 40 f%, 70`,' and 90%, respectively, were obtained . The new membranes can withstand large variations in pH (I to 13) and have excellent chemical and biological stability. The membranes have been tested in a mobile SUF pilot plant operating on oxidation pond effluent . High rejections for BOD, COD, bacteria and suspended solids as well as a 20"" reduction in salinity have been obtained .