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首页> 外文期刊>Environmental Science: Processes & Impacts >Monitoring and assessing the impact of wastewater treatment on release of both antibiotic-resistant bacteria and their typical genes in a Chinese municipal wastewater treatment plant
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Monitoring and assessing the impact of wastewater treatment on release of both antibiotic-resistant bacteria and their typical genes in a Chinese municipal wastewater treatment plant

机译：监测和评估废水处理对中国市政废水处理厂中抗生素抗性细菌及其典型基因释放的影响

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摘要

Wastewater treatment plants (WWTPs) are important hotspots for the spread of antibiotic resistance. However, the release and impact factors of both antibiotic resistant bacteria and the relevant genes over long periods in WWTPs have rarely been investigated. In this study, the fate of bacteria and genes resistant to six commonly used antibiotics was assessed over a whole year. In WWTP effluent and biosolids, a high prevalence of heterotrophic bacteria resistant to vancomycin, cephalexin, sulfadiazine and erythromycin were detected, each with a proportion of over 30%. The corresponding genes (vanA, ampC, sull and ereA) were all detected in proportions of (2.2 ± 0.8) × 10~(-10), (6.2 ± 3.2) × 10~(-9), (1.2 ± 0.8) × 10~(-7) and (7.6 ± 4.8) × 10~(-8), respectively, in the effluent. The sampling season imposed considerable influence on the release of all ARB. High release loads of most ARB were detected in the spring, while low release loads were generally found in the winter. In comparison, the ARG loads changed only slightly over various seasons. No statistical relevance was found between all ARB abundances and their corresponding genes over the long-term investigation period. This inconsistent behavior indicates that bacteria and genes should both be considered when exploring resistance characteristics in wastewater. A redundancy analysis was adopted to assess the impact of wastewater quality and operational conditions on antibiotic resistance. The results indicated that most ARB and ARG proportions were positively related to the COD and turbidity of the raw sewage, while negatively related to those of the effluent. DO and temperature exhibited strong negative relevance to most ARB prevalence.
机译：废水处理厂（WWTP）是传播抗生素耐药性的重要热点。然而，很少研究污水处理厂中抗生素抗性细菌和相关基因的长期释放和影响因素。在这项研究中，对细菌和对六种常用抗生素具有抗性的基因的命运进行了一年的评估。在污水处理厂的废水和生物固体中，检出了对万古霉素，头孢氨苄，磺胺嘧啶和红霉素耐药的异养细菌，这些细菌的比例均超过30％。检测到相应的基因（vanA，ampC，sull和ereA）的比例分别为（2.2±0.8）×10〜（-10），（6.2±3.2）×10〜（-9），（1.2±0.8）×出水分别为10〜（-7）和（7.6±4.8）×10〜（-8）。采样季节对所有ARB的释放产生了相当大的影响。在春季发现了大多数ARB的高释放负荷，而通常在冬季发现了低释放负荷。相比之下，ARG负载在各个季节中仅略有变化。在长期研究期间，所有ARB丰度与其对应基因之间均未发现统计学相关性。这种不一致的行为表明，在探索废水的抗性特性时应同时考虑细菌和基因。采用冗余分析来评估废水质量和操作条件对抗生素抗性的影响。结果表明，大多数ARB和ARG的比例与原污水的COD和浊度呈正相关，而与污水的负相关。 DO和温度与大多数ARB患病率呈极显着负相关。

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