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Play, download and edit the free video IMPACTS OF SOLUTION FLOW RATES AND REGIMES OF PULSED ELECTRIC FIELD ON PROTEIN FOULING FORMATION DURING BIPOLAR MEMBRANE....

Electrodialysis (ED) is a process by which electrically charged membranes are used to separate ions from an aqueous solution under the effect of an electrical potential difference. One of the most interesting electrodialytic processes for the food industry is electrodialysis with bipolar membranes (EDBM) [1]. However, the efficiency of ED processes is limited by the fouling phenomenon, which is the formation of inorganic sediments or organic deposits on the surface and in the pores of membranes [2]. Fouling degrades performances of membranes by increasing the diffusion permeability, decreasing their selectivity, electrical conductivity and exchange capacity, as well as increasing the energy costs of the whole ED process. Pulsed electric fields (PEF), which consists in the application of a constant current density during a fixed time (Ton) followed by a pause lapse (Toff), has a positive impact on fouling removal and minimization [3]. The aim of this study was to investigate the combined effect of three different flow rates of solution (corresponding to Reynolds numbers of 162, 323 and 485) and various pulse-pause ratios of PEF current regime on protein fouling kinetic during EDBM of a model caseinate solution. Four different pulse-pause regimes (PEF ratio 1 (Ton/Toff 10s/10s); PEF ratio 0.5 (Ton/Toff 10s/20s); PEF ratio 0.3 (Ton/Toff 10s/33s); PEF ratio 0.2 (Ton/Toff 10s/50s)) during ED treatment were evaluated. It was found that the decrease in PEF ratio as well as increase of solution flow rate leads to the significant decrease (-87%) in protein fouling of cationic interface of bipolar membrane, which was in contact with caseinate solution. The next step of the work will be the mathematical modelling of the ED process which will be carried out in order to better understand the mechanism of fouling attachment and growth during BMEA.

This study was founded by RFBR, project number 19-38-90256.

References:

1. L. Bazinet, T.R. Geoffroy. Membranes, 10 (2020) 221

2. S. Mikhaylin, L. Bazinet. Advances in Colloid and Interface Science, 229 (2016) 34-56

3. B. Ruiz et al. Journal of Membrane Science, 287 (2007) 41-50

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