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Effects of Enrofloxacin on Nutrient Removal by a Floating Treatment Wetland Planted with Iris pseudacorus : Response and Resilience of Rhizosphere Microbial Communities

Author

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  • Naven Ramdat

    (School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Zi-Jing Wang

    (Department of Environmental Engineering, National Cheng Kung University, Tainan City 701, Taiwan)

  • Jung-Chen Huang

    (Department of Environmental Engineering, National Cheng Kung University, Tainan City 701, Taiwan)

  • Yikun Wang

    (School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Azharuddin Chachar

    (School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Chuanqi Zhou

    (School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Zhiping Wang

    (School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

Abstract

Constructed wetlands (CWs), including floating treatment wetlands (FTWs), possess great potential for treating excessive nutrients in surface waters, where, however, the ubiquitous presence of antibiotics, e.g., enrofloxacin (ENR), is threatening the performance of CWs. In developing a more efficient and resilient system, we explored the responses of the FTW to ENR, using tank 1, repeatedly exposed to ENR, and tank 2 as control. Plant growth and nutrient uptake were remarkably enhanced in tank 1, and similar phosphorus removal rates (86~89% of the total added P) were obtained for both tanks over the experimental period. Contrarily, ENR apparently inhibited N removal by tank 1 (35.1%), compared to 40.4% for tank 2. As ENR rapidly decreased by an average of 71.6% within a week after each addition, tank 1 took only 4 weeks to adapt and return to a similar state compared to that of tank 2. This might be because of the recovery of microbial communities, particularly denitrifying and antibiotic-resistance genes containing bacteria, such as Actinobacteria, Patescibacteria, Acidovorax and Pseudomonas . After three ENR exposures over six weeks, no significant differences in the nutrient removal and microbial communities were found between both tanks, suggesting the great resilience of the FTW to ENR.

Suggested Citation

  • Naven Ramdat & Zi-Jing Wang & Jung-Chen Huang & Yikun Wang & Azharuddin Chachar & Chuanqi Zhou & Zhiping Wang, 2022. "Effects of Enrofloxacin on Nutrient Removal by a Floating Treatment Wetland Planted with Iris pseudacorus : Response and Resilience of Rhizosphere Microbial Communities," Sustainability, MDPI, vol. 14(6), pages 1-18, March.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:6:p:3358-:d:770150
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    References listed on IDEAS

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    1. Kevin J. Forsberg & Sanket Patel & Molly K. Gibson & Christian L. Lauber & Rob Knight & Noah Fierer & Gautam Dantas, 2014. "Bacterial phylogeny structures soil resistomes across habitats," Nature, Nature, vol. 509(7502), pages 612-616, May.
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