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ELECTROLYTE CHEMISTRY AND IMPROVED STACK PERFORMANCE IN HIGH BRINE CONCENTRATION ELECTRODIALYSIS

United States Patent Application

20160228820
A1
View the Complete Application at the US Patent & Trademark Office
Methods for improving ion flux and energy efficiency in a membrane stack of an electrodialysis unit wherein the membrane stack is disposed between an anode and a cathode each in an electrolyte of a selected concentration. Methods include increasing the concentration of the electrolyte, adding a strong base to the electrolyte and adding buffering anions to the electrolyte. Methods for cleaning the electrodes of such a unit involving involve applying a pulsed polarity reversal to the electrodes. Also provided are methods for improving unit operation by increasing the basicity of the electrolyte to the anode and increasing the acidity of the electrolyte to the cathode or alternatively or in addition, by applying heat to increase the operating temperature of at least one of the electrolyte and the treated water stream.
HAYES, Thomas D. (Schaumburg, IL), Severin, Blaine F. (Okemos, MI)
14/ 616,227
February 6, 2015
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0001] This invention was made with government support under grant DE-AC26-07NT42677 awarded by the Department of Energy (DOE). The government has certain rights in the invention.