US 12,221,367 B2
Methods of treating water with powder activated carbon to reduce organic matter content
Douglas A. Godwin, Fairhope, AL (US); and Alan J. Feller, Macy, IN (US)
Assigned to CHEMTREAT, INC., Glen Allen, VA (US)
Filed by CHEMTREAT, INC., Glen Allen, VA (US)
Filed on Oct. 5, 2023, as Appl. No. 18/377,029.
Application 18/377,029 is a continuation of application No. 17/138,317, filed on Dec. 30, 2020, granted, now 11,814,307.
Claims priority of provisional application 62/987,052, filed on Mar. 9, 2020.
Prior Publication US 2024/0034653 A1, Feb. 1, 2024
Int. Cl. C02F 1/68 (2023.01); C02F 1/28 (2023.01); C02F 1/72 (2023.01); C02F 103/06 (2006.01); C02F 103/16 (2006.01)
CPC C02F 1/68 (2013.01) [C02F 1/281 (2013.01); C02F 1/285 (2013.01); C02F 1/72 (2013.01); C02F 2103/06 (2013.01); C02F 2103/16 (2013.01); C02F 2209/20 (2013.01); C02F 2303/18 (2013.01); C02F 2305/02 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for treating a steel mill wastewater stream at a steel mill, the method comprising:
measuring an amount of total organic carbon (TOC) in the steel mill wastewater stream;
determining whether a glycol spill has occurred at the steel mill based on the measured amount of TOC in the steel mill wastewater stream; and
treating the steel mill wastewater stream by:
adding powder activated carbon to the steel mill wastewater stream in an amount based on the measured amount of TOC in the steel mill wastewater stream;
mixing the powder activated carbon in the steel mill wastewater stream; and
separating the powder activated carbon from the steel mill wastewater stream.