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Water purification system and method using reverse osmosis reject stream in an electrodeionization unit

Image Number 3 for United States Patent #7919001.

A method for purifying water, comprising separating a supply stream into a permeate stream and a reject stream, removing non-monovalent salt impurities from the reject stream to produce a treated stream; providing the treated stream to a concentrating compartment of an electrodeionization unit; and, producing an EDI product stream of purified water.

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