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Effect of microplastics concentration and size on pollutants removal and antibiotic resistance genes (ARGs) generation in constructed wetlands: A metagenomics insight

文献类型： 外文期刊

作者： Liang, Lin 1 ; Pan, Weiliang 2 ; Mu, Merui 1 ; Zhang, Lin 2 ; Yang, Xiangyu 3 ; Zhang, Ruina 3 ; Du, Lianfeng 1 ; Guo, Xuan 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Plant Nutr Resources & Environm, Beijing 100097, Peoples R China

2.Chongqing Jiaotong Univ, Sch River & Ocean Engn, Chongqing 400074, Peoples R China

3.Hebei Univ Sci & Technol, Coll Environm Sci & Engn, Shijiazhuang 050091, Peoples R China

关键词： Polystyrene; Oxytetracycline; Phytoremediation; Microbial community; Metagenomic; Partial least squares path modeling

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：11.3； 五年影响因子：12.4 ）

ISSN： 0304-3894

年卷期： 2025 年 481 卷

页码：

收录情况： SCI

摘要： The accrual of microplastics (MPs) and antibiotics poses synergistic threats to the environment. This study systemically examined the effect of environmental-level (mu g/L) MPs (90-110 mu m) and nanoplastics (NPs, 700 nm) on constructed wetlands (CWs) treating oxytetracycline-contaminated wastewater via metagenomics analysis. Polystyrene (PS) MPs notably hindered the removal of nitrogen, phosphorus, and oxytetracycline, particularly at high level (1000 mu g/L), with removal rates of 73.34 %, 59.59 %, and 99.34 %, respectively. Among them, the removal of NH4+-N decreased the most in comparison to CK, at 15.26 %. Antibiotic resistance genes (ARGs) copies/16S rRNA ranged from 0.26 to 0.42 in CWs, exceeding that found in rivers by a factor of 1.5 to 2.5 times. The relative abundance of multidrug resistance genes (mdtB, acrB, mexF, mdtC, and mexT) and tetracycline resistance genes (txtA, tetG, and tetP) exhibited a pronounced increase under MPs exposure, ranging from 0.06 to 0.14 and 0.01 to 0.08 copies/16S rRNA, respectively. Redundancy and network analyses emphasized robust associations among contaminant reduction, ARG abundance, and microbial community. Partial least squares path modeling indicated MPs exerted a more profound influence on pollutant removal (coefficient = 0.8194), microbial community (coefficient = 0.3358) and ARGs dissemination (coefficient = 0.6566) compared to NPs. MPs concentrations significantly affects pollutants removal and ARGs proliferation, and MPs with larger sizes amplified ARG dissemination. This research highlights the influence of MPs on CW-mediated wastewater treatment and ARGs accumulation, offering valuable insights for developing ecological wastewater treatment strategies tailored to multi-pollutant scenarios. These insights are fundamental in developing sustainable solutions to the adverse impacts of MPs on ecosystems.

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