Abstract:In this study, six decentralized rural sewage treatment facilities in Luoyang Town, Wujin District, Changzhou City were used as the research objects. The total inlet water, total outflow water and wetland soils from six dispersed rural sewage treatment facilities were sampled. And the mass concentrations of 11 PFCAs (perfluorohydroxyl acid substances, C4-C14), 4 PFSAs (perfluorosulfonic acid substances, C4, C6, C8, and C10),MeFOSA (n-methyl perfluorooctyl sulfonamide), EtFOSA (n-ethyl perfluorooctyl sulfonamide), MeFOSE (n-methyl perfluorooctyl sulfonamide)and other PFOS(perfluorooctane sulfonic acid)precursors were detected in these samples. The results showed that the detection rates of 6 PFCAs and 3 PFSAs in the influent water of 6 sewage treatment facilities were over 83.33%. In PFSAs, PFOS (perfluorooctane sulfonic acid) had the highest concentration, and the concentration range was from N.D. to 79.89 ng/L. In PFCAs, PFOA (perfluorooctanoic acid) had the highest concentration, and the concentration range was from 3.87 to 8.60 ng/L. The concentration characteristics of perfluorinated and polyfluorinated compounds (PFASs) in three different wastewater collection methods was: rainwater and sewage confluence and enterprise drainage > rain and sewage diversion > rainwater and sewage confluence. In the process of A/O contact oxidation and the multistage A/O process, the total concentration of PFASs in the outlet water was higher than that in the inlet water. So these two processes had no removal effect on PFASs. But A/O-MBR process had good removal effect on the medium-chain PFASs, and the removal rate was 81.27%.The removal of PFOS was the most obvious,the concentration of PFOS decreased from 64.45 to 15.41 ng/L, and the removal rate was about 74.90%. However, the process had no obvious removal on the short-chain PFASs. Constructed wetlands also had good removal effect on the medium-chain PFASs. And PFOS in outlet water of wetlands could be reduced from 15.41 ng/L to below the detection limit. The short-chain PFASs had low adsorption potential and hydrophobicity, which made it easier to exist in the liquid phase rather than in the solid phase,so that several processes have no obvious removal effect on them, even the concentration of effluent water is higher than that of inflow water.