PROCESS FOR TREATING A LIQUID INVOLVING CATION EXCHANGE AND SELECTIVE REMOVAL OF NITRATE IONS FROM THE LIQUID, AND ION EXCHANGE RESIN MIXTURES SUITABLE FOR USE THEREIN

摘要

PROCESS FOR TREATING A LIQUID INVOLVING CATIONEXCHANGE AND SELECTIVE REMOVAL OF NITRATE IONS FROMTHE LIQUID, AND ION EXCHANGE RESIN MIXTURES SUITABLEFOR USE THEREINAbstract of the DisclosureA process is disclosed for exchanging hardness ionsand selectively removing nitrate ions from an aqueousliquid, by passing it through a cation/anion exchangeresin mixture, in which (i) hardness ions areexchanged, (ii) any cations and nitrate ions presentare independently removed, and (iii) the anion exchangeresin is loaded with nitrate ions to at least 80% ofits nitrate capacity. Initial regeneration is with achloride salt. The Process avoids calciumprecipitation during regeneration.