US 11,655,166 B2
Water treatment of sodic, high salinity, or high sodium waters for agricultural application
Gary C. Ganzi, Lexington, MA (US); Frederick C. Wilkins, Pepperell, MA (US); Li-Shiang Liang, Harvard, MA (US); and Paul T. Rice, Sewickley, PA (US)
Appl. No. 16/613,306
Filed by Evoqua Water Technologies LLC, Pittsburgh, PA (US)
PCT Filed May 8, 2018, PCT No. PCT/US2018/031588
§ 371(c)(1), (2) Date Nov. 13, 2019,
PCT Pub. No. WO2018/208768, PCT Pub. Date Nov. 15, 2018.
Claims priority of provisional application 62/560,417, filed on Sep. 19, 2017.
Claims priority of provisional application 62/502,957, filed on May 8, 2017.
Prior Publication US 2020/0198995 A1, Jun. 25, 2020
Int. Cl. C02F 9/00 (2006.01); C02F 1/469 (2023.01); B01D 61/44 (2006.01); C02F 1/00 (2023.01); C02F 1/20 (2023.01); C02F 1/52 (2023.01); C02F 1/66 (2023.01); C02F 1/74 (2023.01); C02F 101/10 (2006.01); C02F 101/20 (2006.01); C02F 103/08 (2006.01)
CPC C02F 1/4693 (2013.01) [B01D 61/44 (2013.01); C02F 9/00 (2013.01); C02F 1/004 (2013.01); C02F 1/20 (2013.01); C02F 1/5236 (2013.01); C02F 1/66 (2013.01); C02F 1/74 (2013.01); C02F 2101/101 (2013.01); C02F 2101/203 (2013.01); C02F 2101/206 (2013.01); C02F 2103/08 (2013.01)] 41 Claims
OG exemplary drawing
 
1. A method of providing water suitable for irrigation use, the method comprising:
producing pre-treated water from untreated feed water by adding an oxidizing compound to the untreated feed water or to the pre-treated water and precipitating and filtering in-situ oxidizable compounds comprised of one or more of iron, manganese, sulfur, selenium, heavy metals, and other inorganic or organic materials from the untreated feed water;
feeding the pre-treated water to an electrodialysis apparatus;
treating the pre-treated water in the electrodialysis apparatus by selectively removing a fraction of either one or both of monovalent anionic and monovalent cationic species from the pre-treated water while preferentially retaining either one or both of multivalent anionic and multivalent cationic species to produce a treated water stream having a lower ratio of monovalent ions to multivalent ions than the pre-treated water; and
directing the treated water into an irrigation water distribution system.