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.
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.
Chemosphere. 2019 Dec;237:124490. doi: 10.1016/j.chemosphere.2019.124490. Epub 2019 Jul 30.
The occurrence of fungi in water supply systems causes many environmental problems (e.g., odor, taste, turbidity, formation of mycotoxins); it has been an area of increasing concern in recent years. Ultraviolet irradiation can inactivate fungi efficiently. However, its reactivation poses further challenges in water purification. The reactivation characteristics of waterborne fungi under different environmental conditions have rarely been reported. In this study, the effects of temperatures and dark delay on the reactivation of three genera of fungal spores (Trichoderma harzianum, Aspergillus niger, Penicillium polonicum) were evaluated. The reactivation levels among these fungal spores were compared in phosphate buffer solution (PBS) and in real groundwater. It was found that lower temperature can inhibit the photoreactivation of fungi, whereas higher temperatures would promote the process. A long-term dark delay can inhibit the photoreactivation of fungi effectively. The dark repair of fungal spores almost do not occur neither in PBS nor in real groundwater. Finally, the photoreactivation percentage in real groundwater was higher than that in PBS. This study will provide a basis for controlling the reactivation of fungi in water.
供水系统中真菌的出现会引发许多环境问题（如异味、味道、浑浊度、霉菌毒素的形成）；近年来，这一问题引起了越来越多的关注。紫外线辐照可以有效地灭活真菌。然而，其再活化在水净化方面带来了进一步的挑战。水载真菌在不同环境条件下的再活化特性很少有报道。在这项研究中，评估了温度和暗延迟对三种真菌孢子（哈茨木霉、黑曲霉、波兰青霉）再活化的影响。比较了这些真菌孢子在磷酸盐缓冲溶液（PBS）和实际地下水中的再活化水平。结果表明，较低的温度可以抑制真菌的光复活，而较高的温度则会促进这一过程。长时间的暗延迟可以有效地抑制真菌的光复活。真菌孢子的暗修复在 PBS 和实际地下水中都几乎不会发生。最后，实际地下水中的光复活百分比高于 PBS。本研究将为控制水中真菌的再活化提供依据。
