FIELD: modifying electrodialysis plant membranes.
SUBSTANCE: proposed method for modifying anion-exchange membrane MA-40 involves treatment of the latter by dipping it in room-temperature aqueous solution of following composition, g/l: potassium or ammonium persulfate, 50 - 70; sulfuric acid, 50 - 70. Membrane treated in this way is used in membrane electrolyzer designed for extracting hexavalent chromium compounds (ion chromate and bichromate) from wash water filling intercepting bath.
EFFECT: improved exchange properties of membrane.
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