Abstract: Wastewater discharge, which is generated in an ion exchange regeneration system having a cation exchange bed and an anion exchange bed, is minimized by circulating a displacement rinse through a cation exchange bed, saving an effluent of the displacement rinse to be used as a regenerant solution in a subsequent cycle, circulating the remaining rinse in the cation exchange bed through an anion exchange bed that has been exhausted by service flow, circulating a displacement rinse through the anion exchange bed, and circulating a final rinse through the cation and anion exchange beds. The volume of wastewater discharge can be reduced to a degree of approximately 80-90% of a typical conventional system, i.e., waste water discharge can be reduced to 1-2 bed volumes. Storage tanks, automation valves, etc. can be eliminated while high reduction of wastewater discharge is effected.

Abstract: A method for minimizing wastewater discharge generated in an ion exchange regeneration system having a cation exchange bed and an anion exchange bed, which method is characterized in that all of the segments of regenerant and displacement rinse are recirculated in a common loop, and shifted forward by one position, whereby the first segment is discarded in the subsequent cycle, and the last segment in the subsequent cycle is provide by fresh rinse, while chemicals are added as necessary, and in final rinse cycle, rinse flows through the cation exchange bed and the anion exchange bed in series, and recirculates in a loop, thereby eliminating over 90% of waste.

Abstract: A method for minimizing wastewater discharge generated in an ion exchange regeneration system having a cation exchange bed and an anion exchange bed, which method is characterized in that all of the segments of regenerant and displacement rinse are recirculated in a common loop, and shifted forward by one position, whereby the first segment is discarded in the subsequent cycle, and the last segment in the subsequent cycle is provide by fresh rinse, while chemicals are added as necessary, and in final rinse cycle, rinse flows through the cation exchange bed and the anion exchange bed in series, and recirculates in a loop, thereby eliminating over 90% of waste.