Electrodialysis with asymmetrically profiled membranes: Influence of profiles geometry on desalination performance and limiting current phenomena

Current distribution along electrodialysis stacks and its influence on the current-voltage curve: behaviour from near-zero current to limiting plateau

“…The LCD was comprised between ⁓5.5 and ⁓27.3 A m -2 , confirming the roughly proportional influence of both the flow rate (or velocity) and Cdil,IN. A modest increase in LCD with Cconc,IN was found, as already observed in previous experiments with shorter stacks [74,79].…”

“…A/m 2 at 2 cm/s) providing the highest η were practically coincident with the LCDs. As the applied voltage increased in the plateau region, η slowly decreased, as already observed in previous experiments [74,79]. Interestingly, a very non-uniform current distribution was observed at any applied voltage.…”

Estado del arte. Métodos de desalinización de agua

“…Los cationes migran a través de la membrana de intercambio catiónico, pero son retenidos en la membrana de intercambio aniónico; los aniones migran a través de la membrana de intercambio aniónico, pero son retenidos a su vez en la membrana de intercambio catiónico. Por lo tanto, hay canales en los que se produce acumulación de iones, mientras en otros disminuye su concentración, pudiéndose extraer agua con muy baja concentración de sales por una parte, y una corriente muy concentrada por otra [47,48,49,50]. Un esquema del procedimiento se muestra en la Figura 5.…”

Improvement of Selectivity of RALEX-CM Membranes via Modification by Ceria with a Functionalized Surface

“…In this regard, the search for ways to separate singly and doubly charged ions is attracting more and more attention [ 24 , 25 , 26 ]. A number of approaches have been proposed to improve the selectivity of industrial membranes [ 27 ], e.g., membrane profiling [ 28 ], deposition of a layer of oppositely charged polyelectrolyte or several layers of alternately charged polyelectrolytes [ 25 , 29 , 30 ].…”