Dissolved effluent organic matter (dEfOM) from wastewater treatment plants (WWTPs) is bound to encounter photo- and bio-degradation as discharged into the receiving water body. However, the comprehensive variations of dEfOM by photo- and bio-degradation are not well unveiled because of its compositional heterogeneity. In this work, dissolved organic carbon (DOC) concentrations, UV–Vis and fluorescent spectra combined with fluorescence regional integration (FRI) analysis were used to investigate the changes in bulk dEfOM and its fluorescent components during photo- and bio-degradation processes in the receiving water body. Results showed that 48.49%–69.62% of the discharged dEfOM was decomposed by ultra violet (UV)-irradiation and indigenous microbes, while the others (33%–45%) were recalcitrant and stable in the receiving water body. Specifically, the photo- and bio-degradation of chromophoric, fluorescent dEfOM and its components were found to follow the single or double exponential kinetic model, and the differences in photo- and bio-degradability of each components shifted its composition. Furthermore, results of bio-degradation after UV-irradiated dEfOM indicated that there was overlapping of photo- and bio-degradable fractions in dEfOM, and photoreactions could improve the self-production of natural organic matter in the receiving water body. These results could improve the understanding the fate of discharged dEfOM in the receiving water body, and we proposed some cost-effective strategies for discharging WWTPs effluent.

来自废水处理厂（WWTP）的溶解的废水有机物（dEfOM）排放到接收水体中必然会发生光降解和生物降解。但是，由于光降解和生物降解造成的dEfOM的全面变化，由于其组成的异质性，并未得到很好的揭示。在这项工作中，使用溶解的有机碳（DOC）浓度，UV-Vis和荧光光谱与荧光区域积分（FRI）分析相结合，研究了dEfOM及其荧光组分在光降解和生物降解过程中的变化。接收水体。结果表明，排出的dEfOM中有48.49％–69.62％被紫外线和本机微生物分解，而其余的（33％–45％）在接收水体中顽固并稳定。特别，发现发色，荧光dEfOM及其组分的光降解和生物降解遵循单指数或双指数动力学模型，每种组分的光降解和生物降解能力的差异改变了其组成。此外，紫外线辐照后的dEfOM的生物降解结果表明，dEfOM中存在光降解和可生物降解的部分重叠，并且光反应可以改善接收水体中天然有机物的自我产生。这些结果可以增进对接收水体中排放的dEfOM命运的了解，并且我们提出了一些具有成本效益的策略来排放污水处理厂的废水。每种成分的光降解和生物降解能力的差异改变了其成分。此外，紫外线辐照后的dEfOM的生物降解结果表明，dEfOM中存在光降解和可生物降解的部分重叠，并且光反应可以改善接收水体中天然有机物的自我产生。这些结果可以增进对接收水体中排放的dEfOM命运的了解，并且我们提出了一些具有成本效益的策略来排放污水处理厂的废水。每种成分的光降解和生物降解能力的差异改变了其成分。此外，紫外线辐照后的dEfOM的生物降解结果表明，dEfOM中存在光降解和可生物降解的部分重叠，并且光反应可以改善接收水体中天然有机物的自我产生。这些结果可以增进对接收水体中排放的dEfOM命运的了解，并且我们提出了一些具有成本效益的策略来排放污水处理厂的废水。光反应可以改善接收水体中天然有机物的自我产生。这些结果可以增进对接收水体中排放的dEfOM命运的了解，并且我们提出了一些具有成本效益的策略来排放污水处理厂的废水。光反应可以改善接收水体中天然有机物的自我产生。这些结果可以增进对接收水体中排放的dEfOM命运的了解，并且我们提出了一些具有成本效益的策略来排放污水处理厂的废水。