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抗生素药物在医院污水中广泛存在,传统的处理工艺对其未能妥善拦截,这些抗生素被排入城市污水厂后,将引起耐药菌及相应抗性基因的传播,进而影响水环境生态安全。为降低对城镇受纳水体的生态危害,揭示废水中磺胺甲噁唑(SMX)的去除机理,采用梯度驯化与批次试验的方法,分析磺胺甲噁唑对A/O-MBR工艺的影响及其降解、吸附和水解情况。结果表明,SMX对COD、氨氮的去除影响较小。SMX浓度的提高,会在短期内抑制反硝化活性,从而引起TN去除效果的波动。抗生素浓度从零逐步升高至3 mg/L时,厌氧释磷速率下降了46.65%,造成TP去除率下降29.16%。反应器经过一定的驯化后可对SMX产生较好的去除能力,SMX浓度从0.5 mg/L提高至1 mg/L以后,其去除率均在95%以上。生物降解是SMX的主要去除途径,吸附、水解作用对于SMX的去除贡献不足千分之一。
Antibiotics are widely existed in hospital sewage. The traditional treatment process fails to properly intercept them. When these antibiotics are discharged into the municipal wastewater treatment plant, they will cause the spread of resistant bacteria and corresponding resistance genes, which will affect the ecological safety of water environment. In order to reduce the ecological harm to urban receiving water, to reveal the removal mechanism of sulfamethoxazole (SMX) in wastewater, the effect of sulfamethoxazole on A / O-MBR process was analyzed by gradient acclimation and batch test. Its degradation, adsorption and hydrolysis. The results showed that SMX had little effect on COD and ammonia nitrogen removal. The increase of SMX concentration will inhibit the denitrification activity in a short time, which will cause the fluctuation of TN removal effect. When the concentration of antibiotics increased gradually from zero to 3 mg / L, the anaerobic phosphorus release rate decreased by 46.65%, resulting in a decrease of TP removal rate of 29.16%. After some domestication, SMX could be well removed. After SMX concentration increased from 0.5 mg / L to 1 mg / L, the removal rate of SMX was over 95%. Biodegradation is the main route for the removal of SMX. Adsorption and hydrolysis contribute less than 1 in 1000 to the removal of SMX.