US 11,851,346 B2
Creation of an iron product for wastewater treatment
Ali Safarzadeh-Amiri, Ontario (CA); Zachary Bryan Scott, San Diego, CA (US); and John Ray Walton, Colfax, CA (US)
Assigned to U.S. Peroxide, LLC, Atlanta, GA (US)
Appl. No. 17/252,693
Filed by TROJAN TECHNOLOGIES GROUP ULC, London (CA)
PCT Filed Jul. 3, 2019, PCT No. PCT/IB2019/000868
§ 371(c)(1), (2) Date Dec. 15, 2020,
PCT Pub. No. WO2020/008268, PCT Pub. Date Jan. 9, 2020.
Claims priority of provisional application 62/693,747, filed on Jul. 3, 2018.
Prior Publication US 2021/0114895 A1, Apr. 22, 2021
Int. Cl. C01G 49/12 (2006.01); C01G 49/10 (2006.01); C02F 1/52 (2023.01); C02F 101/10 (2006.01)
CPC C01G 49/10 (2013.01) [C01G 49/12 (2013.01); C02F 1/5245 (2013.01); C02F 2101/101 (2013.01); C02F 2303/02 (2013.01)] 19 Claims
 
1. A method for making a non-hazardous iron product for treating wastewater, comprising:
combining sodium bisulfite with an aqueous solution comprising iron, thereby creating a mixed aqueous solution;
combining an amount of sodium hydroxide with the mixed aqueous solution to increase the pH of the mixed aqueous solution to between 2-2.5; and
combining an amount of a buffer with the mixed aqueous solution that adjusts the pH of the mixed aqueous solution to a desired pH to produce the non-hazardous iron product, the buffer being selected from the group consisting of sodium carbonate and sodium bicarbonate,
wherein the non-hazardous iron product is in the form of a slurry.