Abstract
This work is devoted to the study of the processes of processing sodium chloride solutions, close in composition to reverse osmosis water desalination concentrates, by the electrodialysis method. When conducting electrolysis of solutions, open two-chamber electrolyzers were used. Solutions with sodium chlorides were placed in the anode chamber, and the cathode chamber was filled with alkali solutions with a concentration of 200-1000 mg-eq/dm3. Electrolysis in an open two-chamber electrolyzer was carried out using sodium chloride solutions with a chloride concentration from 60 to 1725 mg-eq/dm3. In this case, an anion exchange membrane MA-41 was used. The cathode was made of alloyed steel 12X18H10T, the anode was made of a titanium plate coated with ruthenium oxide. The area of the electrodes Sa = Sk = 12 cm2. The cathode chamber was filled with 0.2 N NaOH solution; the anode region – with a working solution of sodium chloride. At a given current strength, the electrolysis process was carried out for 2-8 hours, periodically monitoring the alkalinity in the catholyte, the content of chlorides and active chlorine in the anolyte.