School of Environment, Tsinghua University, Beijing, China.
Biomed Environ Sci. 2011 Aug;24(4):400-7. doi: 10.3967/0895-3988.2011.04.011.
The growth and repair potential of three typical microorganisms in reclaimed water after UV disinfection was investigated to assess the effects of photo-reactivation and dark repair of microorganisms, and the microbial safety of reclaimed water following this procedure.
The growth and repair potential of Escherichia coli, a fecal coliform strain and Bacillus subtilis in the effluent of a biological wastewater treatment plant disinfected by a low-pressure UV lamp were investigated.
Any increase in bacterial numbers in the effluent after UV disinfection was due to damage repair. Exposure to photo-reactivating light for 8-10 h after UV irradiation with a dose of 5 mJ/cm(2), the highest percentage of photo-reactivation observed for E. coli and the fecal coliform strain was 29% and 15% respectively. B. subtilis showed little photo-reactivation under these conditions. The percentage of photo-reactivation was related to the UV dose and the photo-reactivating time, and a function was developed to forecast the final concentrations of E. coli and the fecal coliform strain after UV disinfection with possible photo-reactivation.
Different species of bacteria displayed different responses to UV light and different repair potentials. The repair of indigenous bacteria in wastewater needs to be investigated in future work.
研究经紫外线（UV）消毒后的再生水中三种典型微生物的生长和修复潜力，以评估微生物光复活和暗修复的影响，以及该处理程序后再生水的微生物安全性。
研究了经低压 UV 灯消毒的生物污水处理厂出水中大肠杆菌、粪大肠菌群和枯草芽孢杆菌的生长和修复潜力。
UV 消毒后，出水中细菌数量的任何增加都归因于损伤修复。在剂量为 5 mJ/cm(2)、辐照后暴露于光复活光 8-10 h 时，观察到大肠杆菌和粪大肠菌群的最高光复活率分别为 29%和 15%。枯草芽孢杆菌在这些条件下几乎没有光复活。光复活率与 UV 剂量和光复活时间有关，并开发了一个函数来预测可能存在光复活的 UV 消毒后大肠杆菌和粪大肠菌群的最终浓度。
不同种类的细菌对紫外线有不同的反应和不同的修复潜力。未来的工作需要研究废水中土著细菌的修复。
