Thermal hydrolysis-induced molecular transformations in sludge: Implications for photochemical reactivity and dissolved antibiotics photodissipation

文献类型： 外文期刊

第一作者： Wen, Haifeng

作者： Wen, Haifeng;Wang, Xin;Zhang, Xinchao;He, Yiyang;Gu, Lin;Zhang, Hanlin;Wu, Peize

作者机构：

关键词： Sludge thermal hydrolysis; Dissolved organic matter; Photodegradation; Reactive oxygen species; Electron transfer capacity

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 491 卷

页码：

收录情况： SCI

摘要： Thermal hydrolysis is an effective technique for enhancing the solubilization of sewage sludge and improving the safety of biosolids for disposal or reuse. However, the release of various dissolved organic matter (DOM) at different TH temperatures, along with their properties that may influence intrinsic photochemical characteristics, remains poorly understood. This study investigates the temperature-dependent molecular evolution of sludge DOM (90-220 degrees C) and its impact on antibiotic photodegradation. FT-ICR MS and ETC analysis were employed to explore the structural evolution, redox properties, and reactive oxygen species generation of DOM. The results reveal that 150 degrees C represents a critical threshold for optimal photochemical activity. At this temperature, proteinaceous substances undergo decarboxylation and denitration, reducing polar functional groups and enhancing electron donor capacity (30.424 mu mol e- (mg C)-1 ). Simultaneously, this molecular transformation facilitates the generation of excited triplet states (3DOM*) and significantly enhances the production efficiency of key reactive oxygen species (ROS), such as 1O2and center dot O2- . These properties significantly improved sulfamethoxazole photodegradation (kobs=0.2587 h-1). Below 150 degrees C, limited DOM release and reduced ROS production hinder photochemical activity, whereas above 180 degrees C, the increased aromaticity and molecular stability of humic-like substances inhibited photochemical reactivity due to light-shielding effects. This study offers a theoretical basis for optimizing sludge thermal hydrolysis conditions and links DOM molecular structures to the fate of dissolved antibiotics during photodegradation.

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