Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China.
Wuhan Polytechnic University, Wuhan 430023, PR China.
J Hazard Mater. 2023 Sep 15;458:131929. doi: 10.1016/j.jhazmat.2023.131929. Epub 2023 Jul 3.
Performic acid (PFA) has received increasing attention in water disinfection due to its high disinfection efficiency and fewer formation of disinfection by-products. However, the inactivation of fungal spores by PFA has not been investigated. In this study, the results showed that the log-linear regression plus tail model adequately described the inactivation kinetic of fungal spores with PFA. The k values of A. niger and A. flavus with PFA were 0.36 min and 0.07 min, respectively. Compared to peracetic acid, PFA was more efficient in inactivating fungal spores and caused more serious damage on cell membrane. Compared to neutral and alkaline conditions, acidic environments demonstrated a greater inactivation efficiency for PFA. The increase of PFA dosage and temperature had a promoting effect on the inactivation efficiency of fungal spores. PFA could kill the fungal spores by damaging cell membrane and penetration of cell membranes. In real water, the inactivation efficiency declined as a result of the existence of background substances such as dissolved organic matter. Moreover, the regrowth potential of fungal spores in R2A medium were severely inhibited after inactivation. This study provides some information for PFA to control fungi pollution and explores the mechanism of PFA inactivation.
过氧乙酸（PFA）因其高效的消毒效率和较少形成消毒副产物而在水消毒中受到越来越多的关注。然而，PFA 对真菌孢子的失活作用尚未得到研究。在这项研究中，结果表明，对数线性回归加尾部模型充分描述了 PFA 对真菌孢子的灭活动力学。PFA 对黑曲霉和黄曲霉的 k 值分别为 0.36 min 和 0.07 min。与过氧乙酸相比，PFA 对真菌孢子的灭活效率更高，对细胞膜造成的损伤更严重。与中性和碱性条件相比，酸性环境对 PFA 的灭活效率更高。增加 PFA 剂量和温度对真菌孢子的灭活效率有促进作用。PFA 可以通过破坏细胞膜和穿透细胞膜来杀死真菌孢子。在实际水中，由于存在溶解有机物等背景物质，灭活效率会下降。此外，真菌孢子在 R2A 培养基中的再生潜力在失活后受到严重抑制。本研究为 PFA 控制真菌污染提供了一些信息，并探讨了 PFA 灭活的机制。
