典型污水处理工艺对抗生素污染特性影响的研究

Study on the influence of typical wastewater treatment processes on antibiotic contamination characteristics

为探究不同污水处理工艺对抗生素污染特性的影响,以四大类9种较常见抗生素为研究对象,综合比较AO+三级絮凝、A2O、A2O+纤维滤池、CASS污水处理工艺下处理设施进、出水及剩余污泥中抗生素的分布和去除情况,采用风险熵值法对外排水环境受纳水体进行生态风险评估。结果表明:混合污水来源的处理厂进出水中抗生素总浓度均较高,且最高浓度基本为磺胺类;各污水处理工艺和污泥吸附均能实现部分抗生素的去除,AO+三级絮凝沉淀的去除效率处理工艺最佳达71.1%,A2O最低仅为44.1%;经典型处理工艺的外排废水中目标抗生素对受纳水体几乎不构成生态风险,适当关注OFL。

Nine common antibiotics in four major categories were taken as the research object in order to explore the influence of different sewage treatment processes on the pollution characteristics of antibiotics.The distribution and removal of antibiotics in the inlet,effluent and residual sludge of treatment facilities were comprehensively compared under the four sewage treatment processes of AO+tertiary flocculation,A2O,A2O+fiber filter and CASS.The risk entropy method was used to assess the ecological risk of external drainage environment receiving water bodies.The results showed that the total concentration of antibiotics in and out of the treatment plant with mixed sewage was high,and the highest concentration was basically sulfonamides.All the wastewater treatment processes and sludge adsorption can achieve partial antibiotic removal,the best removal efficiency of AO+tertiary flocculation precipitation treatment is 71.1%,and the lowest removal efficiency of A2O is only 44.1%.The target antibiotics in effluents with typical treatment processes pose almost no ecological risk to the receiving water body,and appropriate attention to OFL is required.