The removal of antibiotic resistance genes by different biological treatment processes of four wastewater treatment plants in various seasons

Q2 Agricultural and Biological Sciences
Zimu Wang, Guolan Wang, Jieting Qu, Wentao Hong, L. Luo
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引用次数: 0

Abstract

The widespread antibiotic resistance genes (ARGs) severely jeopardizing human health have been widely concerned. Wastewater treatment plants (WWTPs) are commonly considered the important sources and sinks of ARGs due to their roles in depositing ARGs and provoking ARGs' proliferation. Current WWTPs often use biological treatment to remove pollutants, whereas the purification efficacy of ARGs is unclear. Thus, this study investigated the seasonal changes of ARGs (tetA, tetC, tetM, tetO, tetQ, tetW, and tetX, as representative) and a class of integron (intI1) in the sludge of different treatment units of four WWTPs to understand the role of WWPTs in ARGs spread. It is found that ARGs abundance varied between summer and winter depending on the types of ARGs and treatment units. The cumulative abundance of ARGs in the same treatment unit showed no obvious difference between seasons. By comparison, ARGs abundance was generally lower in the anoxic unit than in the oxic unit. Moreover, the WWTPs with Cyclic Activated Sludge System (CASS) process reduced the amount of ARGs in sludge, while the WWTPs with Anaerobic-Anoxic-Oxic (A2O) increased ARGs abundance. In conclusion, this study demonstrated that the excess sludge still posed a risk for ARG spread after biological treatment.
四个污水处理厂不同季节不同生物处理工艺对抗生素耐药基因的去除效果
广泛存在的抗生素耐药基因(ARGs)严重危害人类健康,已引起广泛关注。污水处理厂是ARGs的重要来源和汇,具有沉淀ARGs和引发ARGs增殖的作用。目前污水处理厂多采用生物处理去除污染物,而ARGs的净化效果尚不清楚。因此,本研究通过对四个污水处理厂不同处理单元污泥中ARGs(以tetA、tetC、tetM、tetO、tetQ、tetW和tetX为代表)和一类整合子(intI1)的季节变化进行研究,了解污水处理厂不同处理单元污泥中ARGs的传播作用。根据ARGs类型和处理单元的不同,夏季和冬季ARGs丰度不同。同一处理单元中ARGs的累积丰度在季节间无明显差异。相比之下,缺氧单元的ARGs丰度普遍低于缺氧单元。此外,采用循环活性污泥系统(CASS)工艺的污水处理厂降低了污泥中ARGs的数量,而采用厌氧-缺氧-好氧(A2O)工艺的污水处理厂增加了污泥中ARGs的丰度。综上所述,本研究表明,生物处理后的剩余污泥仍存在ARG扩散的风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Applied Environmental Biotechnology
Applied Environmental Biotechnology Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)
CiteScore
3.70
自引率
0.00%
发文量
2
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