Characteristics And Risks Assessment Of Antibiotics Emission Based On Sewer System Model

In this study,the sewage system model of a city in southeast China was proposed in SWMM.Based on the local basic data,the condition of local sewage system were studied.The rain-derived inflow and infiltration under different rainfall events was discussed.And mass load of target antibiotics in Yixing were estimated.Field experiments examined the concentration of antibiotics in the WWTPs influent and effluent,sewer of community and total outlet,hospital and other locations.The results showed that the high detection rates and detection concentrations of sulfamethoxazole,sulfadiazine,erythromycin and roxithromycin in samples.The sulfamethoxazole was selected as the target antibiotic.The kinetic experiments in the lab-scale sewer reactors showed that the 12 h removal rate of sulfamethoxazole was 81.7%.Based on SWMM and Arc-GIS,loaded sewer system information in Arc-GIS,and the zone was divided into catchment areas according to the terrain,land conditions and other information in Arc-GIS.Used inp.PINS to convert the database to SWMM’s inp file,add pump station,precipitation and other information in SWMM,finally completed the model.According to the characteristics of urban life-water quantity,the daily variation of sewage discharge under dry weather flow conditions was summarized,and based on the total inflow rate was calculated the pumping station lifting amount.Then simulated the sewer system under dry weather and different wet weather conditions,we got the rain-derived inflow and infiltration.Simulation results showed that serious flooding in the whole area near the Jingxiqiao pump station;in the case of moderate rain,the total R was 0.13~0.16,and in the case of heavy rain,the overflow of antibiotics in both rains and the total amount discharged into the environment increased,causing an increase in the mass load of sulfamethoxazole discharged into the environment.