Influence of common ions during ultrafiltration of mixtures Part I. Common anions mixtures

摘要

A lot of experiments were investigated to show the behaviour of an ultrafiltration membrane during the filtration of pure salt solutions. What happens when the filtered solution contains several ions?rnIn this paper, results are given concerning the filtration of mixtures of two salts solutions, salts with a common anion: NaCl + CaCl_2 and Na_2SO_4 + CaSO_4.rnThe surface charge of the membrane is characterized by streaming potential measurements and rejection rates by means of chromatography. These results confirm the adsorption of divalent ions on the surface and a good selectivity for divalent cations.