Session 6: Responses to PFAS/PFOA
This study indicates that foam fractionation (FF) and electrooxidation (EO) are effective for treatment of PFAS-containing electroplating wastewater, individually or in combination, depending on situations and treatment goals.
Managing Water Usage/Waste Management Minimization
Technology Responses to REACh/Regulations
Per- and polyfluoroalkyl substances (PFASs) are a group of chemicals of unique properties and have been widely used in industry processes and consumer products, including electroplating. Studies suggest that exposure to high levels of certain PFAS may lead to adverse health effects. Accordingly, regulations and standards are evolving to address PFAS contamination. Perfluorooctanesulfonic acid (PFOS) was used for metal finishing and electroplating applications as mist suppressant, and it was later replaced by 6:2 fluorotelomer sulfonic acid (6:2 FTS). Given the health concerns and emerging regulations, it is in urgent need to develop technologies that can effectively treat PFAS-containing wastewaters. We in this study examined two promising technologies, foam fractionation (FF) and electrooxidation (EO). FF is effective to separate PFASs from wastewater, forming a low-volume and high-concentration PFAS solution. EO using Magnéli phase titanium sub-oxide anode is effective to destruct PFAS in wastewater or in the concentrated waste generated by FF. The results suggest that FF and EO can be used for treatment of PFAS-containing electroplating wastewater, individually or in combination, depending on situations and treatment goals.