Effect of silver nanoparticles on biological nitrogen removal in sequential batch wastewater treatment process: Microbial communities, functional genes, and interactions

文献类型： 外文期刊

第一作者： Zhu, Yuliang

作者： Zhu, Yuliang;Zhang, Yan;Liu, Yucan;Zhang, Hui;Sun, Hongwei;Sun, Hongwei;Yang, Lei;Liu, Chengbin;Yang, Xinyi

作者机构：

关键词： Silver nanoparticles; Biological nitrogen removal; Co-occurrence networks; Interaction relationships; Functional genes

期刊名称：JOURNAL OF WATER PROCESS ENGINEERING （ 影响因子：6.7； 五年影响因子：6.7 ）

ISSN： 2214-7144

年卷期： 2025 年 70 卷

页码：

收录情况： SCI

摘要： Silver nanoparticles (AgNPs) are extensively utilized nanomaterials, and their significant accumulation in wastewater treatment plants (WWTPs) may pose potential risks to the biological nitrogen removal (BNR) process. This study systematically examined the effects of varying concentrations of AgNPs on the BNR process. The findings revealed that AgNPs substantially inhibited the BNR process. Specifically, 2 mg/L AgNPs could suppress nitrification by up to 90 %. Microbial community analysis indicated that Nitrospira was particularly sensitive to AgNPs, with its relative abundance decreasing from 0.40 % in the control group (S0, without AgNPs) to 0.05 % in the treatment group (S2, with 2 mg/L AgNPs). The abundance of denitrifying bacteria Thauera consistently declined as the concentration of AgNPs increased. The Sloan neutral model and network analysis demonstrated that the presence of AgNPs increased the stochasticity of microbial community composition and reduced the number of interaction relationships for Nitrosomonas by 2.21-fold, while increasing the negative interactions for Nitrospira by 4.18-fold and decreasing positive interactions by 2.07-fold. These changes led to a reduction in the stability of nitrogen removal function within the BNR system. Structural equation modeling analysis further showed a strong negative correlation between AgNPs and Thauera along with their functional genes. This study provides a theoretical foundation for understanding the potential impact of AgNPs on the BNR process in WWTPs.

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