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 |
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.
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