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Rapid Disinfection by Peracetic Acid Combined with UV Irradiation
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2018-06-04 , DOI: 10.1021/acs.estlett.8b00249
Peizhe Sun 1, 2 , Tianqi Zhang 1 , Benjamin Mejia-Tickner 1 , Ruochun Zhang 3 , Meiquan Cai 1, 4 , Ching-Hua Huang 1
Affiliation  

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 simultaneous application of UV and PAA. The effectiveness of this new disinfection strategy has been demonstrated not only in lab water but also in wastewater matrices.

中文翻译:

过氧乙酸结合紫外线辐射快速消毒

这项研究提出了一种新的消毒方法,在阐明紫外线/ PAA下的消毒机理的基础上,依次应用过氧乙酸(PAA)和紫外线(UV)。结果表明,与单独使用PAA或单独使用UV相比,由UV激活的PAA产生的羟基自由基在UV / PAA下对大肠杆菌的灭活作用增强。此外,羟基自由基产生的位置是关键因素。与主要在本体溶液中生成羟基自由基的UV / H 2 O 2不同,由于PAA扩散,UV / PAA下的羟基自由基在大肠杆菌细胞附近或内部产生。因此,在UV / PAA下,羟基自由基比在UV / H下具有更强的消毒能力2 O 2条件。在黑暗中将大肠杆菌预先暴露在PAA中,然后施加紫外线(例如,PAA-UV / PAA工艺),可促进PAA向细胞的扩散,并实现出色的消毒效率,同时节省与之相关的一半以上的能源成本紫外线与同时使用紫外线和PAA相比。这种新的消毒策略不仅在实验室用水中而且在废水基质中也证明了其有效性。
更新日期:2018-06-04
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