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Regulating organic loading to mitigate the impact of microplastics on nitrogen removal and microbial communities in SBR systems

文献类型： 外文期刊

作者： Yang, Yi 1 ; Luo, Lin 1 ; Zhu, Jian 2 ; Deng, Kai 2 ; Li, Changjun 2 ; Zhang, Ying 2 ; He, Zhongxiang 2 ; Wang, Pofei 2 ; Peng, Hua 2 ;

作者机构： 1.Hunan Agr Univ, Coll Environm & Ecol, Changsha 410028, Hunan, Peoples R China

2.Hunan Acad Agr Sci, Hunan Cultivated Land & Agr Eco Environm Inst, Changsha 410125, Peoples R China

3.Minist Agr Key Lab Agr Environm Middle Reach Plain, Changsha 410125, Peoples R China

4.Hunan Dongting Lake Basin Engn Res Ctr Agr Nonpoin, Yueyang, Peoples R China

关键词： Organic loading rate; Polyethylene microplastics; Nitrogen removal; Extracellular polymeric substances; Bacterial community

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 74 卷

页码：

收录情况： SCI

摘要： The organic loading rate (OLR) is a key factor influencing activated sludge formation, while microplastics (MPs) have been shown to impact activated sludge performance and microbial community structure. However, the differential effects of MPs on nitrogen removal and microbial communities at varying OLRs remain unclear. This study investigates the effects of polyethylene microplastics (PE-MPs, the entire text will be abbreviated as MPs) on nitrogen removal efficiency and microbial community dynamics under different OLR conditions. Results demonstrate that at low OLR (0.05-0.10 kg BOD5/ (kg MLSS center dot d)), MPs significantly reduced nitrogen removal efficiency, while this effect was less pronounced at normal OLR conditions (0.10-0.20 kg BOD5/ (kg MLSS center dot d)), where nitrogen removal was maintained at approximately 83 % and effluent total nitrogen concentration was maintained at 7.37 mg/L, meeting the Class I effluent standards. This phenomenon could be attributed to two primary factors: (1) inhibition of extracellular polymeric substances (EPS) formation, with decreased release of protein (PRO) and polysaccharide (PSR) negatively affecting system stability and nitrification; and (2) nutrient scarcity, which led to the proliferation of heterotrophic bacteria that competed for resources and occupied space, thereby impacting the nitrifying microbial community (AOB, NOB, and NIRS). These results suggest that optimizing the influent OLR to 0.10-0.20 kg BOD5/ (kg MLSS center dot d)) can help to mitigate the negative impacts of MPs in wastewater treatment systems.

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