Abstract
Mature landfill leachate is known for nitrogen-removal challenging and meantime was considered as an important sink of antibiotic resistance genes (ARGs). The added external carbon sources, enabling the short-cut nitrification and denitrification, may facilitate the proliferation of bacteria that possibly carry ARGs. However, this speculation has yet to be studied. Here, we explored the effects of glucose, sodium acetate, and methanol supplements on ARGs during whole-run and short-cut treatment processes. The results showed that sodium acetate supplement during short-cut process efficiently reduced the abundances of total ARGs (0.84–1.99 copies/16S rRNA) and integrons (0.59–1.20 copies/16S rRNA), which were highly enhanced by methanol addition during whole-run treatment process (total ARGs: 3.60–11.01 copies/16S rRNA, integrons: 1.20–4.69 copies/16S rRNA). Indirect gradient analysis showed that the variation of ARGs was not correlated with the supplement of different external carbon source. Correlation analysis indicated that dominant intl1 (55.99 ± 17.61% of integrons) showed positively significant correlations with all detected ARGs expect for sul2 and ermB (p < 0.05), suggesting the significant role on ARGs dissemination. Redundancy analysis illustrated that the potential hosts of intl1, intl2, sul1, tetQ, tetM, mefA, and mexF were dominant Bacteroidetes and Actinobacteria. Interestingly, the numbers and significant extent of correlations under the supplement of sodium acetate during short-cut denitrification process were obviously declined, and it was in accordance with ARGs reduced by sodium acetate supplement, suggesting sodium acetate displayed the efficient ARGs reduction during short-cut process. In summary, this study provides a comparative understanding of the effects on ARGs by different carbon source supplements during nitrification-denitrification processes of leachate; sodium acetate is the optimal carbon source.
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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We thank the reviewers for their suggestions and constructive comments on this manuscript.
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We received financial support from the National Key Research and Development Program of China (2018YFC1901000) and Shanghai Chengtou Group Corporation Science and Technology Innovation Program Project (CTKY-ZDXM-2021-016).
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Meilan Zhang: conceptualization, methodology, software. Kaiyi Li: conceptualization, methodology, investigation. Panliang Wang: formal analysis, writing—original draft preparation, data curation. Wenchao Gu: writing—original draft preparation. Huang: data curation. Bing Xie: writing—review and editing, supervision. All authors have read and agreed to the published version of the manuscript.
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Zhang, M., Li, K., Wang, P. et al. Comparative insight into the effects of different carbon source supplement on antibiotic resistance genes during whole-run and short-cut nitrification-denitrification processes. Environ Sci Pollut Res 30, 74742–74753 (2023). https://doi.org/10.1007/s11356-023-27412-4
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DOI: https://doi.org/10.1007/s11356-023-27412-4