Effect of membrane permselectivity on the fouling of cationic membranes during skim milk electroacidification

Identification of Skim Milk Electroacidification Fouling: A Microscopic Approach

“…This was confirmed by the ash content of the BMEA CMX membranes which was 55.6% higher than that of original membranes, with respective values of 15.6 ± 0.5 and 10.1 ± 0.3 g/100 g dry membrane. These results are in accordance with those of Bazinet et al (11) and Ogata et al (7).…”

“…According to the elemental mapping, magnesium was not precipitated on the surface membrane. As suggested by Bazinet et al (11), its presence was due only to its migration from the milk to the base solution. These results confirmed the data previously obtained on membrane chemical composition and physical parameters.…”

“…The structure of this deposit resembles a shell. It seems that the deposit had partially penetrated the membrane structure before precipitating; part of the calcium migrating from the milk solution precipitated inside the membrane as suggested by Bazinet et al (11) and part precipitating on the surface of the membrane in contact with the milk.…”

“…The membrane resistance was measured as previously described by Bazinet et al (11) using specially designed pliers from the Association Montpellièraine pour le Développement des Procédésà Membranes (St. Jean de Védas, France).…”

“…This deposit affected the performance of the system and decreased the life-time of the membrane (10). In a previous work on membrane permselectivity, this deposit was identified as a mix of calcium and magnesium salts (11). These ions migrating from the milk solution would precipitate with OH − produced on the anionic side of the BPM and would form a fouling complex on the CEM surface (10, 11).…”