Removal of antibiotic resistance genes from wastewater treatment plant effluent by coagulation

Antibiotic resistance genes (ARGs), as emerging environmental contaminants, have become a threat to human health. Recent studies have demonstrated that the effluent from wastewater treatment plants is a significant point source of ARGs released into the environment. In this study, we investigated th...

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Bibliographic Details
Published in:Water research (Oxford) 2017-03, Vol.111, p.204-212
Main Authors: Li, Na, Sheng, Guo-Ping, Lu, Yong-Ze, Zeng, Raymond J., Yu, Han-Qing
Format: Article
Language:English
Subjects:
Anti-Bacterial Agents - pharmacology
Antibiotic resistance genes (ARGs)
Coagulation
Drug Resistance, Microbial - genetics
Effluent
Genes, Bacterial - drug effects
Removal
Tetracycline Resistance - drug effects
Waste Water
Wastewater treatment plant
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Summary:Antibiotic resistance genes (ARGs), as emerging environmental contaminants, have become a threat to human health. Recent studies have demonstrated that the effluent from wastewater treatment plants is a significant point source of ARGs released into the environment. In this study, we investigated the effectiveness of coagulation technology in the removal of ARGs from treated wastewater. Specifically, we measured the removal of five ARGs (two sulfonamide resistance genes, sulI and sulII, and three tetracycline resistance genes, tetO, tetW and tetQ) and the class 1 integron intI1 gene via the application of two coagulants: FeCl3 and polyferric chloride (PFC). Moreover, the removal of dissolved organic carbon (DOC), NH3N and total phosphorus (TP) in the coagulation process was investigated. The coagulation process effectively removed ARGs from the effluent with 0.5-log to 3.1-log reductions. Significant removal correlations were observed between dissolved NH3N and DOC, intI1 and sulI, sulII and tetO, sulII and tetW, and tetO and tetW, implying that the co-removal of DOC, dissolved NH3N, the intI1 gene and different ARGs played an important role in ARG loss during coagulation with Fe-based coagulants. These results indicate that coagulation may play a promising role in ARG reduction in wastewater treatment plants. [Display omitted] •Coagulation effectively removed ARGs from effluent with 0.5-log to 3.1-log reduction.•Removal between sulI and intI1, sulII/tetO and tetW have significant correlations.•Fe species may influence ARG removal in coagulation process.•Coagulation is an effective technique for ARG removal from WWTP effluent.
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2017.01.010