Distribution characteristics of sulfonamide antibiotics between water and extracellular polymeric substances in municipal sludge

文献类型： 外文期刊

第一作者： Cheng, Ming

作者： Cheng, Ming;Shi, Chen;Zhao, Bo-Han;Wang, Tai-Yue;Liu, Ran-Bin;Cao, Da-Qi;Hao, Xiao-Di;Nan-Zhang

作者机构：

关键词： Partition coefficient; Alginate-like extracellular polymer; Dissolved organic carbon; Sludge treatment

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：7.7； 五年影响因子：7.5 ）

ISSN： 0013-9351

年卷期： 2024 年 259 卷

页码：

收录情况： SCI

摘要： The interaction between extracellular polymeric substances (EPS) in municipal sludge and antibiotics in wastewater is critical in wastewater treatment, resource recovery, and sludge management. Therefore, it is increasingly urgent to investigate the distribution coefficient (Log K) of sulfonamide antibiotics (SAs) in EPS, particularly in sludge-derived dissolved organic carbon (DOC) and aqueous phase systems. Herein, through balance experiments, the concentrations of SAs were determined using alkaline extraction EPS (AEPS) and alginate-like extracellular polymer (ALE) systems, and the Log K-DOC values were determined. The results showed that the Log K-DOC of AEPS was higher than that of ALE, which exhibited a negative K-DOC value, indicating an inhibitory effect on dissolution. For the three SAs studied, the Log K-DOC values were in the following order: sulfamethoxazole > sulfapyridine > sulfadiazine. This order can be attributed to the differing physicochemical properties, such as polarity, of the SAs. Three-dimensional excitation-emission matrix fluorescence spectra and fitting results indicated a lack of aromatic proteins dominated by tryptophan and humus-like substances in ALE. Meanwhile, the hydrophobic interaction of aromatic proteins dominated by tryptophan was the main driving force in the binding process between AEPS and SAs.

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