| Nowadays,with the rapid growth of population and the improvement of people’s consumption level,a large number of antibiotic drugs are used in the medical industry and animal husbandry.Researchers tested river water,drinking water,soil and other environmental media,found a large number of antibiotic pollutants.The presence of antibiotic pollutants in the environment has an impact on human and animal health.Therefore,the study of antibiotic pollution to the environment is of great significance for ensuring the quality of drinking water and human health.The increase of antibiotic pollutants in water has brought great harm to the ecology.Shanghai is a highly polluted area with developed industry and agriculture and high living standard.This research mainly with cephalosporin class of antibiotics,cefotaxime(CTX),cefuroxime(CXM),cefepime(CED),ammonia benzyl cephalosporin(LEX)as the research object,collected in Shanghai three town sewage treatment plants,sewage and sludge using solid phase extraction method for the purification of the sample concentration,by UPLC/MS/MS instrument testing,studied the cephalosporin class of antibiotics in sewage treatment plant distribution characteristics,different treatment phase of the treatment effect and migration transformation rule.The main conclusions of this study are as follows:(1)The sample pretreatment and detection methods adopted in this paper show that the recovery rate of the measured water sample is 84.27%-113.06% and that of the measured mud sample is 82.40%-117.83%.(2)The content levels of water and mud samples from three sewage treatment plants were studied,and all four antibiotics were detected.In STW A,the winter inlet concentration of CTX,CXM,CED and LEX was ND-27.20 μg/L,the outlet concentration was ND-16.92 μg/L,and the measured content in the sludge was 0.13-2.48 μg/g.The concentration of inlet water in summer was ND-16.34 μg/L,the concentration of outlet water was ND-7.03 μg/L,and the measured content of sludge was 0.16-3.03 μg/g.In STW B,the winter inlet concentration of CTX,CXM,CED and LEX was ND-36.46 μg/L,the outlet concentration was ND-26.99 μg/L,and the measured content in the sludge was 0.10-1.85 μg/g.In summer,the concentration of inlet water was ND-16.34 μg/L,the concentration of outlet water was ND-8.28 μg/L,and the measured content of sludge was 0.15-2.06 μg/g.In THE sewage treatment plant C,the winter inflow concentration of CTX,CXM,CED and LEX was ND-42.15 μg/L,the effluent concentration was ND-23.06 μg/L,and the measured content in the sludge was 0.13-1.62 μg/g.In summer,the concentration of inlet water was 0.96-22.45 μg/L,the concentration of outlet water was Nd-6.67 μg/L,and the measured content of sludge was0.11-3.91 μg/g.(3)In different seasons for three of antibiotics in sewage treatment plant sewage and sludge concentration levels were analyzed,and the results show that different antibiotics in the sewage treatment plant sewage and sludge concentration distribution changes with the seasons as a whole similar laws,through calculation,the removal rate of wastewater treatment process of antibiotics in three sewage treatment plant of CTX removal rate is 11.85%-60.27%,the degradation rate of 4.21% to 46.33%.The CXM removal rate was 26.73%-54.56%,and the degradation rate was 3.38%-36.51%.The removal rate of CED is 7.31% to 31.51%,and the degradation rate is 22.02% to 47.91%.LEX had a removal rate of 9.30%-72.17% and a degradation rate of 11.01%-39.99%.By comparing the removal rate,degradation rate and adsorption rate of antibiotics in samples,it can be seen that sludge adsorption,hydrolysis and photolysis are the main ways to purify target pollutants in water in sewage treatment plants. |
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