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1. (WO2017040531) ION EXCHANGE REGENERATION PROCESS UTILIZING MEMBRANE DISTILLATION

Pub. No.:    WO/2017/040531    International Application No.:    PCT/US2016/049495
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Wed Aug 31 01:59:59 CEST 2016
IPC: C02F 1/44
C02F 1/42
C02F 9/02
Applicants: PEPSICO, INC.
Inventors: YU, Jim Tsungyeh
WILLMAN, Eric Jon
SATHYAGAL, Arun
Title: ION EXCHANGE REGENERATION PROCESS UTILIZING MEMBRANE DISTILLATION
Abstract:
Method for treating effluent waste from a cation-exchange column regeneration cycle, including backwashing the column; regenerating the column using rinse water and regenerant brine having a temperature warmer than room temperature, thereby forming waste effluent containing divalent cations; precipitating the divalent cations in a precipitation reactor at a temperature warmer than room temperature; filtering precipitation effluent; optionally, adjusting the filtered precipitation effluent pH; concentrating the filtered precipitation effluent via membrane-based water recovery, thereby forming separated concentrated salt and pure rinse water; and recirculating separated concentrated salt and pure rinse water back to the column for a subsequent regeneration cycle. Also, a system including an exhausted cation-exchange column; a chemical precipitation reactor; a filtration unit; an optional pH adjustment unit; and a membrane-based water recovery unit, wherein the system is a closed-loop through which salt and rinse water having a temperature warmer than room temperature recirculate.