Life cycle assessment of UVC-based advanced oxidation processes as quaternary treatments: Clostridium spp. inactivation and comparison with CECs removal

IF 8 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Science of the Total Environment Pub Date : 2025-03-15 DOI:10.1016/j.scitotenv.2025.179029

R. López-Timoner , L. Santos-Juanes , A.M. Amat , F. Arfelli , D. Cespi , F. Passarini , M.I. Polo , E. Zuriaga , A. Arques

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Abstract

In this work, Life Cycle Assessment has been applied for the evaluation of UVC-based photochemical treatments to deal with wastewater treatment plant effluents. In particular, UVC photolysis, UVC/H₂O₂ combination and UVC/H₂O₂/Fe(II) (namely photo-Fenton) were tested at pH ca. 7.5. Clostridium spp. was chosen as target species to test disinfection. Both, UVC/H₂O₂ and photo-Fenton were able to decrease Clostridium spp. below detection limit in 5 min. Best results were reached with H₂O₂ concentration of 21 mM. Coupling coagulation-flocculation with the photochemical process was tested for effluents with high organic load and turbidity. Global warming potential selected UVC photolysis as the best treatment for disinfection from the environmental point of view, despite its lower efficiency. However, when CECs removal was considered using acetaminophen as target contaminant, photo-Fenton was the most efficient and the most sustainable option. Finally, LCA was applied to the experimental work performed in the laboratory, showing that the effect of reactions was negligible vs. sample collection and transportation, as well as analytical procedures which accounted for more than 99 % of the impact.

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基于紫外线的高级氧化工艺作为四级处理的生命周期评估：梭状芽孢杆菌灭活及与 CECs 去除的比较

本研究将生命周期评价方法应用于uvc光化学处理对污水处理厂出水的处理效果评价。特别是在pH约为7.5的条件下，测试了UVC光解、UVC/H2O2结合和UVC/H2O2/Fe(II)（即光- fenton）。选择梭状芽胞杆菌作为目标菌种进行消毒试验。UVC/H2O2和光fenton均能在5 min内将Clostridium spp.降至检出限以下，H2O2浓度为21 mM时效果最佳。对高有机负荷、高浊度出水进行了混凝-絮凝耦合光化学工艺试验。从环境的角度来看，全球变暖潜势选择UVC光解作为最佳的消毒方法，尽管其效率较低。然而，当考虑使用对乙酰氨基酚作为目标污染物去除CECs时，光fenton是最有效和最可持续的选择。最后，将LCA应用于实验室中进行的实验工作，表明反应对样品收集和运输的影响可以忽略不计，以及占99%以上影响的分析程序。

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来源期刊

Science of the Total Environment 环境科学-环境科学

CiteScore

17.60

自引率

10.20%

发文量

8726

审稿时长

2.4 months

期刊介绍： The Science of the Total Environment is an international journal dedicated to scientific research on the environment and its interaction with humanity. It covers a wide range of disciplines and seeks to publish innovative, hypothesis-driven, and impactful research that explores the entire environment, including the atmosphere, lithosphere, hydrosphere, biosphere, and anthroposphere. The journal's updated Aims & Scope emphasizes the importance of interdisciplinary environmental research with broad impact. Priority is given to studies that advance fundamental understanding and explore the interconnectedness of multiple environmental spheres. Field studies are preferred, while laboratory experiments must demonstrate significant methodological advancements or mechanistic insights with direct relevance to the environment.