Hybrid reverse osmosis — ultrafiltration membranes |
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Authors: | S.B. Sachs E. Zisner G. Herscovici |
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Affiliation: | Israel Desalination Engineering, Tel-Aviv Israel |
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Abstract: | 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 (4–10 m3/m2 day) at low pressures (6–10 at) and moderate rejections for various salts. From 200 mg/l solutions of NaNO3, Na2SO4 and KH2PO4 rejections up to 40%, 70% and 90%, respectively, were obtained. The new membranes can withstand large variations in pH (1 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. |
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