Distribution of antibiotic resistance in the effluents of ten municipal wastewater treatment plants in China and the effect of treatment processes
Abstract Municipal wastewater treatment plant (WWTP) effluents represent an important contamination source of antibiotic resistance, threatening the ecological safety of receiving environments. In this study, the release of antibiotic resistance to sulfonamides and tetracyclines in the effluents of ten WWTPs in China was investigated. Results indicate that the concentrations of antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) ranged from 1.1?×?10 1 to 8.9?×?10 3 ?CFU?mL −1 and 3.6?×?10 1 ( tet W) to 5.4?×?10 6 ( tet X) copies mL −1 , respectively. There were insignificant correlations of the concentrations of ARB and ARGs with those of corresponding antibiotics. Strong correlations were observed between the total concentrations of tetracycline resistance genes and sulfonamide resistance genes, and both of which were significantly correlated with int I1 concentrations. Statistical analysis of the effluent ARG concentrations in different WWTPs revealed an important role of disinfection in eliminating antibiotic resistance. The release rates of ARB and ARGs through the effluents of ten WWTPs ranged from 5.9?×?10 12 to 4.8?×?10 15 ?CFU?d −1 and 6.4?×?10 12 ( tet W) to 1.7?×?10 18 ( sul 1) copies d −1 , respectively. This study helps the effective assessment and scientific management of ecological risks induced by antibiotic resistance discharged from WWTPs. Highlights The release of antibiotic resistance from WWTP effluents was quantified. Antibiotic resistance to sulfonamides was higher than that to tetracyclines. int I1 was closely involved in the dissemination of ARGs in WWTPs. Disinfection played an important role in eliminating antibiotic resistance. Ozone was less effective in reducing antibiotic resistance than UV and chlorine. Graphical abstract [DISPLAY OMISSION]
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- DOI : http://dx.doi.org/10.1016/j.chemosphere.2017.01.041
- Elsevier : 저널> 권호 > 논문
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