Patent ID: 8585906

Claim:
A method of regenerating spent cation exchange resin, the method comprising: (a) preparing a fresh regenerant solution comprising sodium ions and chloride ions; (b) passing the regenerant solution across spent cation exchange resin to regenerate the spent cation exchange resin, thereby forming fresh cation exchange resin and spent regenerant solution; (c) dispensing a regenerant treatment composition into the spent regenerant solution, the regenerant treatment composition comprising at least one hydroxide component and at least one carbonate component, thereby forming a treated regenerant liquid and precipitate flocs; (d) separating the precipitate flocs from the treated regenerant liquid to form a separated regenerant solution; (e) adjusting the concentration of the chloride ions in the separated regenerant solution to form fresh regenerant solution; and (f) repeating (b) through (e) with the fresh regenerant solution to regenerate additional spent cation exchange resin.