期刊
BIORESOURCE TECHNOLOGY
卷 308, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123274
关键词
Solid-phase denitrification (SPD); Oxytetracycline (OTC); Microbial community structure; Antibiotic resistance genes (ARGs); Denitrification genes
资金
- Fundamental Research Funds for Zhejiang Universities [2019J00047]
- National Natural Science Foundation of China [51709236]
- College Students' Science and Technology Innovation Project (Xinmiao Talents Scheme) in Zhejiang Province of China [2019R411005]
The coexistence of nitrate and antibiotics in wastewater is a common problem. The study aimed to explore the response of denitrifying community, denitrification genes and antibiotic resistance genes (ARGs) to oxytetracycline (OTC) stress in polycaprolactone (PCL) supported solid-phase denitrification (SPD) reactors. Complete nitrate reduction (greater than99%) was achieved in SPD system with OTC stress of 0, 0.05, 0.25 and 1 mg L-1 during three-month operation, while it significantly declined by about 5% at a further increased OTC level of 5 mg L-1. The efficient denitrification strongly related with a rich diversity of denitrifiers, while the abundances of which dramatically reduced as the OTC concentration reached >= 0.25 mg L-1, which caused significant decline of denitrification genes, especially for narH, narJ, narI nirD, nosZ, and norB. Tetracycline resistance genes were a major type of promoted ARGs by different OTC stress, mainly related with the increase of tet36, tetG, tetA, tetM and tetC.
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