Скачать или смотреть Methods to Effectively Remove PFASs from Fire Suppression Systems - ESTCP Project ER20-5364

Fire suppression systems, such as fixed hangar systems and aviation rescue and firefighting (ARFF) vehicles, are known to be impacted by residual per- and polyfluoroalkyl substances (PFAS) absorbed to internal surfaces as a result of the legacy and ongoing use of Class B firefighting formulations, such as aqueous film-forming foam (AFFF). When fire suppression systems are transitioned to PFAS-free formulations without appropriate cleaning, residual PFAS have been shown to contaminate the replacement formulation. In order to reduce PFAS liability, a field-proven protocol is required to remove PFAS entrained on surfaces to prevent contamination of new formulations. The overall objective of this project was to develop methods to effectively remove entrained PFAS from existing fire suppression infrastructure, including characterization tools for examining PFAS-impacted surfaces. First, laboratory work was conducted to evaluate PFAS residuals on hangar piping exposed to AFFF for a prolonged period, as well as optimize removal methods. Next, optimized cleaning methods were demonstrated in the field on an ARFF vehicle and a fixed fire suppression system. The methods developed will provide a basis for wider application at DoD facilities and other sites. Additional information is available on the project web page at https://www.serdp-estcp.org/projects/detai....