Inactivation and subsequent reactivation of Aspergillus species by the combination of UV and monochloramine: Comparisons with UV/chlorine  

作　　者：Gehui Wu Hui Zhao Qiqi Wan Xiangqian Xu Ruihua Cao Kai Li Jingyi Wang Tinglin Huang Jinsuo Lu Gang Wen 

机构地区：[1]Key Laboratory of Northwest Water Resource,Environment and Ecology,MOE,Xi’an University of Architecture and Technology,Xi’an 710055,China [2]Shaanxi Key Laboratory of Environmental Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China [3]State Key Laboratory of Green Building in Western China,Xi’an University of Architecture and Technology,Xi’an 710055,China

出　　处：《Journal of Environmental Sciences》2022年第7期105-118,共14页环境科学学报（英文版）

基　　金：supported by the Natural Science Foundation of China (Nos. 51978557 , 51678472);the Shaanxi Science Fund for Distinguished Young Scholars (No. 2018JC026);the Youth Innovation Team of Shaanxi Universities;Shaanxi Provincial Key Research and Development Project (No. 2020ZDLSF06-05)。

摘　　要：Ultraviolet(UV)/monochloramine(NHCl) as an advanced oxidation process was firstly applied for Aspergillus spores inactivation. This study aims to: i) clarify the inactivation and photoreactivation characteristics of UV/NHCl process, ii) compared with UV/Clin inactivation efficiency, photoreactivation and energy consumption. The results illustrated that UV/NHCl showed better inactivation efficiency than that of UV alone and UV/Cl, and could effectively control the photoreactivation. For instance, the inactivation rates for Aspergillus flavus, Aspergillus niger and Aspergillus fumigatus in the processes of UV/NHCl(2.0 mg/L) was 0.034, 0.030 and 0.061 cm^(2)/m J), respectively, which were higher than that of UV alone(0.027, 0.026 and 0.024 cm^(2)/m J) and UV/Cl(0.023, 0.026 and 0.031 cm^(2)/m J). However, there was no synergistic effect for Aspergillus flavus and Aspergillus fumigatus. As for Aspergillus niger, the best synergistic effect can reach 1.86-log 10. This may be due to their different resistance to disinfectants, which were related to the size, an outer layer of rodlets(hydrophobins) and pigments. After UV/NHCl inactivation, the degree of cell membrane damage and intracellular reactive oxygen species were higher than that of UV alone. UV/NHCl had the advantages of high inactivation efficiency and inhibition of photoreactivation, which provides a new entry point for the disinfection of waterborne fungi.

关 键 词：Aspergillus species UV/NH2Cl disinfection Synergistic effect UV/Cl2 disinfection PHOTOREACTIVATION 

分 类 号：TU991.2[建筑科学—市政工程]