Changes and Health Risks of Polycyclic Aromatic Hydrocarbons and Halogenated Polycyclic Aromatic Hydrocarbons in Drinking Water Treatment
The safety of drinking water is directly related to the public health of the world.In order to understand the pollution status,sources and health risks of polycyclic aromatic hydrocarbons(PAHs)and halogenated polycyclic aromatic hydrocarbons(HPAHs)in drinking water,the water samples were collected from the whole process of three waterworks using the Yangtze River,the Taihu Lake and the Sanhe Rivers as the source water in the wet and the dry seasons,respectively,and were analyzed by gas chromatography-mass spectrometry(GC-MS).The results showed that PAHs and HPAHs were prevalent in the raw water and finished water,and the concentration ranges of PAHs,chlorinated PAHs(Cl-PAHs)and brominated PAHs(Br-PAHs)were 9.74～61.00ng/L,0.32～9.17 ng/L and n.d.～4.15 ng/L,respectively.In brief,the concentration of both PAHs and HPAHs in the dry season was greater than that in the wet season.PAHs in the raw water mainly come from oil pollution and various combustion activities,and the concentration of HPAHs is positively correlated with PAHs,while HPAHs in the finished water mainly come from raw water and chlorination disinfection.The current drinking water treatment process can remove both PAHs and HPAHs from the raw water,but chlorination disinfection may generate new HPAHs contamination.An evaluation of human health risk for the finished water from all three plants showed low carcinogenic risk levels.
Polycyclic aromatic hydrocarbonsHalogenated polycyclic aromatic hydrocarbonsDrinking water treatmentContamination statusSourcesHealth risks
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