期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 771, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.144814
关键词
Wastewater treatment plants; Removal efficiency; Antibiotic resistance; Bacterial community; Co-occurrence pattern
资金
- Natural Science Foundation of China [21876147, 21677121]
- Fundamental Research Funds for the Central Universities [2020FZZX003-02-06]
Wastewater treatment plants in China have been upgraded with various emerging processes, leading to a significant decrease in antibiotic resistance genes concentration, particularly with the A(2)/O-membrane bioreactor process showing higher removal efficiency. Persistent ARGs and MGEs were found in all samples, indicating the need for better strategies to eliminate ARGs in WWTPs.
Wastewater treatment plants (WWTPs) in China have been upgraded or renovated with a variety of emerging processes, but a comprehensive understanding of the behavior of antibiotic resistance genes (ARGs) in these WWTPs is still lacking. Here, the distribution of ARGs and bacterial community were investigated in a wastewater treatment plant with upgrading processes (WWTP-UP). 238 unique ARGs were detected in all samples. During the study period, the average ARGs concentration decreased by 98.4% along the entire treatment process. The removal efficiency of A(2)/O-membrane bioreactor (MBR) process was significantly higher than that of A(2)/O-high efficiency flocculent settling/cloth media filter (HEFS/CMF) process (p < 0.05), which corresponded to 3.5 and 2.1 log values on average, respectively. Notably, 35 ARGs and 14 mobile genetic elements (MGEs) were persistent in all samples. Based on the co-occurrence pattern revealed by network analysis, persistent ARGs possibly spread through the transfer of persistent MGEs among persistent bacteria. Using multiple linear regression analysis, we obtained 3 to 5 possible indicators for major ARG types, which might be served to evaluate the general distribution of ARGs or even predict the abundance of different ARG types. Our findings provide new insights into the impacts of upgrading process on ARGs and highlight the need for better strategies to improve ARGs elimination in WWTPs. (C) 2021 Elsevier B.V. All rights reserved.
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