Method of ion exchange

Details Method of ion exchange Method of ion exchange

1989-07-10

1992-01-28

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210677, 210683, 210903, C02F 142

Patent

active

050841858

ABSTRACT:
The present invention relates to a method of reducing the concentration of contaminant ions, preferably nitrates ions, in impure water. The method comprises steps of: a) passing the impure water through an ion exchange resin to substitute regenerant ions from the resin for dissolved contaminant ions; b) passing a relatively dilute aqueous solution of wash-out ions through said resin to substitute wash-out ions for contaminant ions bound to the resin and; c) passing a relatively concentrated aqueous solution of regenerant ions through said resin to substitute regenerant ions for wash-out ions bound to the resin. The affinity of the resin to wash-out ions diminishes from being greater than that for contaminant and regenerant ions when exposed to a relatively dilute ionic solution to being less than that for said contaminant and regenerant ions when exposed to a relatively concentrated ionic solution. The method allows simplified ion exchange apparatus to be utilized, since the raw water, wash-out solution and regenerant solution may all be passed through the ion exchange resin in the same direction.

REFERENCES:
patent: 2754261 (1956-07-01), Akeroyd
patent: 3645921 (1972-02-01), Salem et al.
patent: 4479877 (1984-10-01), Guter

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