	US 12,459,843 B2
	Methods and compositions for treating industrial wastewater
Xihui Yin, Marietta, GA (US); Jean Robert Durand, Atlanta, GA (US); Forrest Strickland, Atlanta, GA (US); and Anna Casasus, Atlanta, GA (US)
Assigned to KEMIRA OYJ, Helsinki (FI)
Appl. No. 17/417,219
Filed by KEMIRA OYJ, Helsinki (FI)
PCT Filed Dec. 30, 2019, PCT No. PCT/US2019/068959 § 371(c)(1), (2) Date Jun. 22, 2021, PCT Pub. No. WO2020/140118, PCT Pub. Date Jul. 2, 2020.
Claims priority of provisional application 62/785,840, filed on Dec. 28, 2018.
Claims priority of application No. 20195216 (FI), filed on Mar. 25, 2019.
Prior Publication US 2022/0055933 A1, Feb. 24, 2022
Int. Cl. C02F 9/00 (2023.01); B01F 33/45 (2022.01); C02F 1/52 (2023.01); C02F 1/56 (2023.01); C02F 1/66 (2023.01); C02F 1/70 (2023.01); B01F 101/00 (2022.01); C02F 101/10 (2006.01)

CPC C02F 9/00 (2013.01) [B01F 33/45 (2022.01); B01F 2101/305 (2022.01); C02F 1/5245 (2013.01); C02F 1/56 (2013.01); C02F 1/66 (2013.01); C02F 1/70 (2013.01); C02F 2101/106 (2013.01)]

7 Claims

1. A method for removing selenium from a fluid in need of treatment, wherein said method comprises adding one or more coagulants and one or more sulfite-based reducing agents to the fluid in an amount effective to reduce the amount of and/or remove at least a portion of the selenium from said fluid in need of treatment, thereby producing a fluid mixture comprising the one or more coagulant and the one or more sulfite-based reducing agents,

wherein the fluid mixture comprises a ratio of the sulfite-based reducing agent to the coagulant, in unit of ppm dry sulfite-based reducing agent:ppm dry coagulant, of between about 0.36 to about 0.48.