US 12,303,945 B2
Methods for cleaning-in-place
Kristen A. Thoreson, San Clemente, CA (US); Paul R. Erickson, San Clemente, CA (US); and Scott B. Wilson, San Clemente, CA (US)
Assigned to REGENESIS BIOREMEDIATION PRODUCTS, San Clemente, CA (US)
Filed by Regenesis Bioremediation Products, San Clemente, CA (US)
Filed on Oct. 11, 2021, as Appl. No. 17/498,250.
Claims priority of provisional application 63/091,265, filed on Oct. 13, 2020.
Prior Publication US 2022/0111423 A1, Apr. 14, 2022
Int. Cl. B08B 3/08 (2006.01); A61L 2/18 (2006.01); B08B 3/10 (2006.01); C11D 17/00 (2006.01)
CPC B08B 3/08 (2013.01) [A61L 2/18 (2013.01); B08B 3/10 (2013.01); C11D 17/0013 (2013.01); A61L 2202/17 (2013.01)] 20 Claims
 
1. A method of cleaning a contaminated surface comprising per- and polyfluoroalkyl substances (PFAS) within an aboveground fire suppression system, the method comprising the steps of:
introducing a suspension into the aboveground fire suppression system having at least one contaminated surface comprising the PFAS such that the suspension comes into contact with the at least one contaminated surface, the suspension comprising a plurality of solid-phase particles;
maintaining the suspension in contact with the at least one contaminated surface for a sufficient length of time to at least partially decontaminate the at least one contaminated surface via adsorption of at least some of the PFAS by the plurality of solid-phase particles, the suspension being allowed to remain in the aboveground fire suppression system with zero flow during said maintaining step; and
purging the suspension from the aboveground fire suppression system;
wherein the method results in a reduction of PFAS concentration in the aboveground fire suppression system to meet a regulatory standard.