Electrodeionization with ion-exchange textile for the production of high resistivity water: Influence of the nature of the textile

Electrodeionization with ion-exchange textiles (EDIT) is an electromembrane process resulting from the introduction of an ion-exchange textile sheet between the two membranes of the diluate compartment of an electrodialyzer. Conditions for the production of high resistivity water by EDIT were studied. The presence of ion-exchange textile (IET) significantly reduces the conductivity of the outlet NaCl solution. A comparative analysis of EDIT was performed not only as a function of the density of ion-exchange sites and of the geometric alternance of cation and anion exchange layers of the textile, but also of concentration and flow rate of the inlet NaCl solution and of applied current density. The performances of the process were compared in terms of pressure drop between the inlet and outlet of the diluate compartment, voltage drop and demineralization ratio.