Process for treating a liquid involving cation exchange and...

Details Process for treating a liquid involving cation exchange and... Process for treating a liquid involving cation exchange and...

B - Operations, Transporting

01

J

362/36, 403/4

B01J 47/04 (2006.01)

Patent

CA 1273149

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 Abstract of the Disclosure A process is disclosed for exchanging hardness ions and selectively removing nitrate ions from an aqueous liquid, by passing it through a cation/anion exchange resin mixture, in which (i) hardness ions are exchanged, (ii) any cations and nitrate ions present are independently removed, and (iii) the anion exchange resin is loaded with nitrate ions to at least 80% of its nitrate capacity. Initial regeneration is with a chloride salt. The Process avoids calcium precipitation during regeneration.

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