EDI (Electrodeionization)

All natural and municipal water sources are contaminated with ions. RO technology is a cost effective roughing filter for most ion removal. However, There are limits to what an RO is able to remove from water cost effectively. Since RO is not able to remove all of the ions, additional ion exchange processes are required to meet high purity water standards.

EDI is one method, which can be used in place of Mixed Bed to provide consistently high levels of deionization and the removal of contaminants such as silica and TOC, at recovery rates up to 95%.

Electrodeionization (EDI) is a marriage of resin and membrane technologies. In EDI cations and anions in the feed water are exchanged for hydrogen and hydroxyl ions, just as in normal resin exchange systems. The main difference between EDI, and normal ion exchange is the EDI resin is regenerated continuously. With conventional ion exchange, chemical regeneration is performed intermittently. Continuous regeneration in EDI is achieved by means of ion conducting membranes and an electric current. With EDI, large amounts of waste are virtually eliminated.

Progressive can assess your current treatment system to see if EDI is a good fit for you.



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