Rapid Disinfection by Peracetic Acid Combined with UV Irradiation
Rapid Disinfection by Peracetic Acid Combined with UV Irradiation
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DOI：
10.1021/acs.estlett.8b00249
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发表时间：
2018-05
影响因子：
10.9
通讯作者：
Peizhe Sun;Tianqi Zhang;Benjamin Mejia-Tickner;Ruochun Zhang;Meiquan Cai;Ching-Hua Huang
中科院分区：
文献类型：
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作者：
Peizhe Sun;Tianqi Zhang;Benjamin Mejia-Tickner;Ruochun Zhang;Meiquan Cai;Ching-Hua Huang
本研究在阐明过氧乙酸/过氧乙酸消毒机理的基础上，提出了一种新的过氧乙酸/紫外线连续消毒工艺。结果表明，与单独使用PAA或单独使用UV相比，在UV/PAA作用下，PAA产生的羟基自由基能增强大肠杆菌的失活能力。此外，羟基自由基产生的位置是一个关键因素。与UV/H2O2主要在体溶液中产生羟基自由基不同，UV/PAA作用下的羟基自由基由于PAA的扩散而在大肠杆菌细胞附近或内部产生。因此，羟基自由基在UV/PAA条件下的消毒能力明显强于在UV/H2O2条件下。在黑暗中将大肠杆菌预先暴露于PAA，然后应用紫外线（即PAA-UV/PAA工艺）促进PAA向细胞扩散，实现卓越的消毒效率，同时与使用紫外线相比节省一半以上的能源成本。
This study proposes a novel disinfection process by sequential application of peracetic acid (PAA) and ultraviolet light (UV), on the basis of elucidation of disinfection mechanisms under UV/PAA. Results show that hydroxyl radicals, generated by UV-activated PAA, contribute to the enhanced inactivation of Escherichia coli under UV/PAA compared to PAA alone or UV alone. Furthermore, the location of hydroxyl radical generation is a critical factor. Unlike UV/H2O2, which generates hydroxyl radicals mainly in the bulk solution, the hydroxyl radicals under UV/PAA are produced close to or inside E. coli cells, due to PAA diffusion. Therefore, hydroxyl radicals exert significantly stronger disinfection power under UV/PAA than under UV/H2O2 conditions. Pre-exposing E. coli to PAA in the dark followed by application of UV (i.e., a PAA-UV/PAA process) promotes diffusion of PAA to the cells and achieves excellent disinfection efficiency while saving more than half of the energy cost associated with UV compared to si...