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ED-EDR double step electrodialytic pre-treatment and pre-concentration of “Debiensko” coal-mine brine was examined. Univalent ion permeable Tokuyama Co. ACS and CMS membranes were applied in the first electrodialysis step and normal grade CMV, AMV Asahi Glass membranes in the second. Coal-mine brine with 32.8 g/L Cl − content was desalinated and concentrated at a current density of 344–688...
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