Perfluorinated compounds(PFCs)are persistently found in aquatic environment,which are difficult to be removed by the conventional water treatment process.Improving the removal effect of PFCs in water is of great significance.The removal efficacies of four kinds of PFCs in water by the combined process of UV,H2O2 and GAC were studied using the rapid small-scale column tests(RSSCT),and the effects of UV irradiation duration and H2O2 concentration on the direct oxidation of PFCs and the subsequent GAC adsorption were also explored.The results showed that long-chain perfluorooctanoic acid(PFOA)and perfluorooctanesulfonic acid(PFOS)consistently exhibited higher removal rates than short-chain perfluorobutyric acid(PFBA)and perfluorobutane sulfonic acid(PFBS)under different process conditions.The removal rates of long chain perfluorinated PFOA and PFOS by GAC adsorption alone were 59.6％and 64.3％,respectively,but the removal rates of short chain perfluorinated PFBA and PFBS were only 11.7％and 13.1％,respectively.When UV or H2O2 were combined with GAC,the removal rates of the four PFCs slightly increased with the increase of UV irradiation time and H2O2 concentration,and the gain effect of UV irradiation was better than that of H2O2.The combined process of UV/H2O2/GAC presented the best removal effect of the four PFCs in water.After 30 minutes of UV/H2O2 treatment,GAC adsorption could remove higher than 90％of PFOA and PFOS,and the removal rates of short chain perfluorinated PFBA and PFBS were over 50％.After 30 min UV/H2O2/GAC treatment,more than 50％PFBA and PFBS were removed,and more than 90％of PFOA and PFOS can be removed.The excellent effect of the UV/H2O2/GAC combined process was due to the hydroxyl radical oxidation reaction generated by the advanced oxidation process of UV/H2O2,which weakened the competitive adsorption of organic matter on PFCs.This study can provide a technical guidance for the treatment of PFCs in water.
water treatmentadvanced oxidation processactivated carbonperfluorinated compounds
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