In order to assess the efficiency of rural sewage treatment system on steroid estrogen(SEs)re-moval,taking a village sewage station in northern Jiangsu as the research object,the integrated MBBR was modi-fied,the concentrations and removal rates of SEs in influent and effluent water before and after the modification were analyzed,the factors influencing SEs removal were investigated,and the ecological risk of the tail water re-ceiving water was evaluated.The results showed that,when the hydraulic retention time was 20 h,the average mass concentrations of COD,NH3-N,TN,and TP in the effluent water were 12.98,1.92,12.18,and 0.22 mg/L respectively,the effluent water quality met the requirement of level A grade 1 in GB 18918-2002 Discharge standard of pollutants for municipal wastewater treatment plant.On the basis of the above research,the mass concentrations of estrone(E1),estradio(E2)and ethinyl estradio(EE2)in the influent water were found to be in the ranges of 9.1-31.5,4.0-23.4,not detected(ND)-6.7 ng/L respectively,the SEs removal efficiency was sig-nificantly improved.Measures such as extending hydraulic retention time,increasing the concentration of sludge in the biochemical section,and the high temperature environment in summer are all conducive to SEs removal.The ecological risk of E1 in the receiving water of tail water is the highest,which needs to be focused.
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