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Title: Dynamics of microbial community and tetracycline resistance genes in biological nutrient removal process
Authors: Liu, Hang
Sun, Huifang
Zhang, Meng
Liu, Yu
Keywords: Engineering::Environmental engineering
Issue Date: 2019
Source: Liu, H., Sun, H., Zhang, M. & Liu, Y. (2019). Dynamics of microbial community and tetracycline resistance genes in biological nutrient removal process. Journal of Environmental Management, 238, 84-91.
Journal: Journal of Environmental Management
Abstract: The occurrence of antibiotics in wastewater has become a serious concern due to the possible development of antibiotic resistant bacteria in wastewater treatment process. In order to understand the dynamics of microbial community and tetracycline resistance genes in biological nutrient removal (BNR) process, three lab-scale sequencing batch reactors (SBRs) were operated under the stress of tetracycline. Results indicated that microbial community structure was altered, and tetracycline efflux pump genes were enhanced over 150-day operation in the presence of trace tetracycline of 20 and 50 μg L⁻¹, respectively. Furthermore, when the initial tetracycline concentrations were increased to 2 and 5 mg L⁻¹, substantial enhancement of tetracycline resistance was observed, accompanied with a sharp shift in microbial community structure. In this study, horizontal gene transfer was found to be the main mechanism for the development of tetracycline resistance genes under the long-terms stress of trace tetracycline. About 90.34% of the observed variations in tetracycline resistance genes could be explained by the dynamics of potential hosts of tetracycline resistance genes and class 1 integron. It should be noticed that the functional bacteria (e.g. Nitrospira, Dechloromonas, Rhodobacter and Candidatus_Accumulibacter) responsible for nutrient removal were positively correlated with tetracycline resistance, which might promote the prevalence of tetracycline resistance during biological wastewater treatment. Consequently, this study provided in-depth insights into the occurrence and prevalence of tetracycline resistance genes and their microbial hosts in BNR process.
ISSN: 0301-4797
DOI: 10.1016/j.jenvman.2019.02.123
Rights: © 2019 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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