Study on the influence of typical wastewater treatment processes on antibiotic contamination characteristics
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 anti-biotics in and out of the treatment plant with mixed sewage was high,and the highest concentration was basically sulfona-mides.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.
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