US 12,227,442 B2
Treatment of saline water for agricultural and potable use
Gary C. Ganzi, Lexington, MA (US); and Frederick C. Wilkins, Pepperell, MA (US)
Assigned to Evoqua Water Technologies LLC, Pittsburgh, PA (US)
Filed by Evoqua Water Technologies LLC, Tewksbury, MA (US)
Filed on Nov. 21, 2023, as Appl. No. 18/515,814.
Application 18/515,814 is a continuation of application No. 16/641,026, granted, now 11,820,689, previously published as PCT/US2018/047034, filed on Aug. 20, 2018.
Claims priority of provisional application 62/547,971, filed on Aug. 21, 2017.
Prior Publication US 2024/0132389 A1, Apr. 25, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. B01D 61/02 (2006.01); B01D 61/08 (2006.01); B01D 61/46 (2006.01); B01D 61/54 (2006.01); B01D 61/58 (2006.01); C02F 1/469 (2023.01); C02F 9/00 (2023.01); C02F 1/00 (2023.01); C02F 1/20 (2023.01); C02F 1/44 (2023.01); C02F 1/467 (2023.01); C02F 1/66 (2023.01); C02F 101/10 (2006.01); C02F 101/12 (2006.01); C02F 101/16 (2006.01); C02F 103/08 (2006.01)
CPC C02F 9/00 (2013.01) [B01D 61/027 (2013.01); B01D 61/08 (2013.01); B01D 61/46 (2013.01); B01D 61/54 (2013.01); B01D 61/58 (2013.01); B01D 2311/06 (2013.01); B01D 2311/08 (2013.01); B01D 2311/12 (2013.01); B01D 2311/2642 (2013.01); B01D 2311/2649 (2013.01); B01D 2311/2684 (2013.01); B01D 2317/025 (2013.01); B01D 2317/08 (2013.01); C02F 1/004 (2013.01); C02F 2001/007 (2013.01); C02F 1/008 (2013.01); C02F 1/20 (2013.01); C02F 1/442 (2013.01); C02F 1/4674 (2013.01); C02F 1/4693 (2013.01); C02F 1/66 (2013.01); C02F 2101/103 (2013.01); C02F 2101/106 (2013.01); C02F 2101/108 (2013.01); C02F 2101/12 (2013.01); C02F 2101/163 (2013.01); C02F 2103/08 (2013.01); C02F 2209/40 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of treating saline water to produce potable water and irrigation water, the method comprising:
directing water to be treated having a concentration of dissolved salts of between 500 mg/L and 10,000 mg/L to an inlet of an electrodialysis apparatus including one or more monovalent cation selective membranes;
treating the water to be treated in the electrodialysis apparatus to produce a diluate;
determining an amount of the diluate to direct to an irrigation distribution system and an amount of the diluate to direct to an inlet of a low-pressure nanofiltration apparatus;
treating any diluate directed to the inlet of the low-pressure nanofiltration apparatus in the nanofiltration apparatus to produce a permeate and a retentate;
directing at least a portion of any permeate produced in the nanofiltration apparatus to a concentrating compartment of the electrodialysis apparatus; and
combining any retentate with any of the diluate directed to the irrigation distribution system at the irrigation distribution system.