DESALINATION OF CHLORIDE-SULFATE BRACKISH WATER WITH AN ELECTRODIALYZER WITH IMPROVED DESIGN

Abstract

It has been studied that the process of desalination and preconcentration of imitates of brackish chloride-sulfate water with electrodialyzer with improved designs provides high efficiency: it was found that at a current density of 1.0 A/dm2 for 63–105 min, simulate with an initial concentration of NaCl of 4.3 can be desalted — 8.6 g/dm3 to a chloride-water content below the MPC level in drinking water while concentrating brines to110.7–135.8 g/dm3. When SO42– ions are introduced into the initial solution, a decrease in the content of Cl– ions and an increase in the content of SO42– ions in the dilute are observed due to the intensification of the competing transfer of the latter through the ion-exchange membrane. In this regard, in order to achieve the MPC of these ions in drinking water, the duration of the electrodialysis process should be increased. Ref. 12, Fig. 3, Tab. 2.