冬季污水处理厂细颗粒物负载全氟和多氟烷基物质的逸散行为及健康风险OA

To investigate the fugitive emission behavior and health risks of per-and polyfluoroalkyl substances(PFAS)mediated by fine particulate matter(PM2.5)during wastewater treatment,this study employed liquid chromatography-mass spectrometry to analyze typical PFAS in PM2.5 samples from a wastewater treatment plant(WWTP)and surrounding areas in Qingdao during winter,along with corresponding wastewater/sludge samples from treatment units.Results revealed that 10 out of 15 target PFAS were detected in PM2.5 with total concentrations ranging from 110.00 to 336.78 pg·m−3.The fine screen unit exhibited the highest PFAS diversity(10 species),while the sludge dewatering room showed the peak concentration(336.78 pg·m−3).Along the upwind-downwind-WWTP gradient,both PFAS variety and concentration in PM2.5 displayed increasing trends.Wastewater was identified as the dominant source(＞44.73%contribution)of airborne PFAS across all units.Long-chain PFAS demonstrated higher aerosolization priority than short-chain analogs,exhibiting greater fugitive potential from liquid phase.The total diffusive flux of WWTP-originated PFAS in PM2.5 reached 7.12 mg·d−1 with transport distances of 10～40 km.Children in downwind areas showed 3-fold higher exposure doses to PM2.5-bound PFAS compared to adults.These findings provide theoretical support for controlling airborne PFAS pollution and safeguarding public health near WWTPs.