کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6332818 | 1619798 | 2013 | 5 صفحه PDF | دانلود رایگان |
- As a disinfectant, chlorine is more effective than UV in inactivating Aspergillus flavus.
- As a combined method, UV irradiation followed by chlorination shows high efficiency.
- UV irradiation can improve effectiveness of chlorination in reducing Aspergillus flavus.
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 30Â 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 3Â mg/l, in contact time of 60, 5, 1 and 1Â min, respectively. However, combined use (UV irradiation followed by chlorination) was more effective than using either UV or chlorination alone; 5Â s UV irradiation followed by chlorination produced 4 log10 reduction of A. flavus at chlorine concentrations of 2 and 3Â mg/l under a contact time of 15Â min. The results indicated that efficiency of UV irradiation improves when followed by chlorination at low concentrations.
Journal: Science of The Total Environment - Volumes 463â464, 1 October 2013, Pages 525-529