Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; State Key Laboratory of Environmental Sciences, and Key Laboratory of Ministry of Education for Coast and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, China.
Sci Total Environ. 2013 Oct 1;463-464:525-9. doi: 10.1016/j.scitotenv.2013.06.065. Epub 2013 Jul 4.
The disinfection process for inactivating microorganisms at drinking water treatment plants is aimed for safety of drinking water for humans from a microorganism, such as bacteria, viruses, algae, fungi by using chlorination, ozonation, UV irradiation, etc. In the present study, a combination of two disinfectants, UV irradiation followed by chlorination, was evaluated for inactivating Aspergillus flavus under low contact time and low dosage of UV irradiation. The results indicated an inverse correlation between the inactivation of A. flavus by using UV irradiation only or chlorination alone. By using UV radiation, the 2 log10 control of A. flavus was achieved after 30 s of irradiation, while chlorination was observed to be more effective than UV, where the 2 log was achieved at chlorine concentration of 0.5, 1, 2 and 3 mg/l, in contact time of 60, 5, 1 and 1 min, respectively. However, combined use (UV irradiation followed by chlorination) was more effective than using either UV or chlorination alone; 5 s UV irradiation followed by chlorination produced 4 log10 reduction of A. flavus at chlorine concentrations of 2 and 3 mg/l under a contact time of 15 min. The results indicated that efficiency of UV irradiation improves when followed by chlorination at low concentrations.
在饮用水处理厂，消毒过程旨在通过氯化、臭氧、紫外线照射等方法，从微生物（如细菌、病毒、藻类、真菌）的角度确保饮用水的安全。在本研究中，评估了紫外线照射后再进行氯化的两种消毒剂组合，以在低接触时间和低紫外线辐射剂量下灭活黄曲霉。结果表明，单独使用紫外线照射或单独使用氯化对黄曲霉的灭活呈反比关系。使用紫外线辐射，照射 30 秒即可实现黄曲霉的 2 对数控制，而氯化的效果比紫外线辐射更有效，在 60、5、1 和 1 分钟的接触时间下，氯浓度分别为 0.5、1、2 和 3mg/L 时，可实现 2 对数的控制。然而，联合使用（紫外线照射后再氯化）比单独使用紫外线或氯化更有效；在接触时间为 15 分钟时，在 2 和 3mg/L 的氯浓度下，5 秒的紫外线照射后再氯化可使黄曲霉减少 4 对数。结果表明，在低浓度下进行氯化后，紫外线照射的效率会提高。
