Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 712, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.136370
Keywords
Sludge treatment wetlands; Nutrients; Antibiotics; Antibiotic resistance genes; Removal efficiency
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Funding
- Science and Technology Innovation Foundation of Dalian, China [2018J12SN080]
- National Natural Science Foundation of China [51278088]
- Fundamental Research Funds for the Central Universities, DalianMinzu University, China
- Open Fund of Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University), Ministry of Education of China [KF2018009]
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The aim of this research was to analyze the elimination of nutrients, antibiotics as well as antibiotic resistance genes (ARGs) in different sludge treatment wetlands (STWs) with or without reeds and aeration tubes. Five antibiotics, including oxytetracycline, tetracycline, azithromycin, sulfamethoxazole, and sulfadiazine; five ARGs, including two tetracycline ARGs (tetC and tetA), one macrolide ARGs (ermB), and two sulfonamide ARGs (sul1 and sul2); and one integrase gene (intI1) were determined in the surface and bottom layers of three STWs, respectively. The removal efficiencies of antibiotics in the bottom layer were lower than that in the surface layer, while the elimination efficiencies of ARGs showed opposite trend. Strong correlations were observed among the contents of antibiotics as well as related ARGs, and the abundance of ARGs had a strong correlation with intI1 The results demonstrated that the contents of these pollutants decreased during the resting period in all the STWs, while the wetland had reeds and aeration tubes performed the best. (C) 2020 Elsevier B.V. All rights reserved.
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