PURIFICATION OF AQUEOUS LIQUIDS

摘要

A process for purifying an aqueous feed liquid comprising chloride ions, comprising the steps of: a) performing a first electrodialysis step wherein the feed liquid is passed through diluate and concentrate compartments of leading ED module(s) to give a first diluate having a reduced chloride content and a first concentrate having a chloride content greater than that of the feed liquid; b) performing a second electrodialysis step wherein the said first diluate is passed through diluate compartments of following ED module(s) to give a second diluate having a further reduced chloride content and a second concentrate having a chloride content greater than that of the first diluate; c) contacting the second concentrate with an electrode to generate chlorine and/or hypochlorous acid; and d) disinfecting at least a part of the feed liquid using the chlorine and/or hypochlorous acid generated in step c); wherein the leading and following ED modules are connected in series.