中国环境科学

作者：王静怡, 吴戈辉, 万琪琪, 黄廷林, 文刚

单位：西安建筑科技大学环境与市政工程学院, 西北水资源与环境生态教育部重点实验室, 陕西省环境工程重点实验室, 陕西 西安 710055

关键词：真菌孢子,过氧甲酸,羟基自由基,联合消毒,饮用水处理

基金：陕西省教育厅青年创新团队科研计划项目(22JP040);陕西省重点科技创新团队项目(2023-CX-TD-32)

The study investigated the effects and mechanisms of fungal spore inactivation by pre-exposure to peracetic acid (PFA) combined with ultraviolet (UV) light and subsequent PFA treatment. It was found that PFA, as an effective disinfectant, could produce strong oxidative effects under low-pressure UV activation, disrupting the cell wall structure of fungal spores and thereby achieving inactivation. The results indicated that PFA pretreatment could enhance the subsequent UV/PFA combined disinfection process. Under the same UV and PFA dosage conditions, after 12minutes of PFA pretreatment followed by UV inactivation, the inactivation rates of Aspergillus niger and Aspergillus flavus increased to 3.67-log and 2.51-log, respectively, which were 1.21 and 1.17 times the effect of direct UV/PFA treatment. Additionally, the study examined the influence of pretreatment time, PFA concentration, pH value, and humic acid concentration on the inactivation effect. Increasing the pretreatment time and PFA concentration significantly improved the inactivation efficiency, while alkaline conditions and high humic acid concentrations were detrimental to the inactivation effect. Flow cytometry analysis revealed that the PFA-UV/PFA combined treatment caused more severe damage to the cell membrane and significantly increased reactive oxygen species levels. The generation of more hydroxyl radicals and stronger synergistic effects were key factors in enhancing the inactivation effect. Furthermore, the PFA-UV/PFA treatment was more effective in inhibiting the regeneration ability of incompletely inactivated fungal spores compared to the UV/PFA treatment alone. Compared to the PAA-UV/PAA system, the PFA-UV/PFA combined inactivation system demonstrated higher potential and efficiency in inactivating fungal spores.

来源：2024年第11期

《中国环境科学》期刊编辑部

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