Electrodeionization is the combination of ion exchange resins, ion exchange membranes, and electricity to separate ions from water. The ion exchange resins behave exactly like a mixed bed polisher, however the electric field aids in the hydrolysis of water to produce hydrogen and hydroxide ions which continuously act as regenerants. The combination of technologies allows for > 16 MΩ-cm water to be continuously produced with no downtime for operator intensive regeneration procedures. The chemical free regeneration also minimizes storage and waste handling equipment, creating a small footprint and economical system. The concentrate stream from the EDI is typically lower TDS than the raw plant water and can be re-used for other purposes (depending on the application) to increase efficiency.
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