US 12,325,646 B2
Fertigation water treatment
Serge Levesque, Guelph (CA); Thomas Graham, Guelph (CA); Dorin Bejan, Guelph (CA); Jamie Lawson, Guelph (CA); Mike Dixon, Guelph (CA); and Ping Zhang, Guelph (CA)
Assigned to UNIVERSITY OF GUELPH, (CA)
Appl. No. 17/609,549
Filed by UNIVERSITY OF GUELPH, Guelph (CA)
PCT Filed May 8, 2020, PCT No. PCT/CA2020/050634
§ 371(c)(1), (2) Date Nov. 8, 2021,
PCT Pub. No. WO2020/223824, PCT Pub. Date Nov. 12, 2020.
Claims priority of provisional application 62/891,398, filed on Aug. 25, 2019.
Claims priority of provisional application 62/845,302, filed on May 8, 2019.
Prior Publication US 2022/0234916 A1, Jul. 28, 2022
Int. Cl. C02F 1/46 (2023.01); C02F 1/461 (2023.01); C02F 1/467 (2023.01); C05C 3/00 (2006.01); C05C 5/00 (2006.01); A01G 31/02 (2006.01); C02F 101/30 (2006.01)
CPC C02F 1/4672 (2013.01) [C02F 1/46109 (2013.01); C05C 3/00 (2013.01); C05C 5/00 (2013.01); A01G 31/065 (2025.01); C02F 2001/46147 (2013.01); C02F 2101/306 (2013.01); C02F 2201/4614 (2013.01); C02F 2201/46145 (2013.01); C02F 2201/46185 (2013.01); C02F 2209/06 (2013.01); C02F 2209/40 (2013.01); C02F 2301/046 (2013.01); C02F 2303/04 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A regenerative in situ oxidant producing method for the treatment of fertigation water, comprising:
flowing fertigation water containing organic matter through an electrochemical cell to effect regenerative mediated electrolysis, the electrochemical cell comprising a boron-doped diamond (BDD) anode and at least one complementary stainless steel cathode while simultaneously adjusting one or more of current density, flow rate and pH;
continuously regenerating oxidative species in an effective amount to control an oxidant-susceptible pathogen and/or degrade the organic matter thereby releasing solubilized nutrients in said fertigation water; and
collecting the electrochemically treated fertigation water effluent, wherein chlorate species formed in said fertigation water effluent is below about 2 mg/L in said treated effluent; and/or ammonium, nitrate and sulphate ions are increased in said treated fertigation water effluent compared to the fertigation water before treatment.