گندزدایی آبهای آلوده به کلیفرم مدفوعی با استفاده از ازن: بررسی تاثیر غلظت ازن و زمان تماس

Introduction & Purpose:Chlorine is the most important matter to water disinfection due to a residual effect. But by formation of by-products could be harmful to consumers’ health ,The researchers decided to use the method or other material. For this reason, in this study ozone used to water disinfection and its performance to disinfect of contaminated water with Escherichia coli was investigated. Methods: E. coli was utilized to contaminated water preparation. Culture and counting methods were performed according to the standard methods and recorded with CFU/ml. Normality of the data was analyzed by using Asmynrf-Kolmogrov test and T-test and ANOVA were used to statistical analysis, too. Results :Theresults showed that the destruction of E. coli increased by increasing of ozone concentration and decreasing of density. Removal of the concentration of 1 mg per liter, compared with a concentration of 5 mg per liter of ozone in the ozone density〖10〗^4و〖10〗^5 CFU / ml is significant(P_value0.05). Conclusion :Ozone due to its oxidizing effect on microorganisms is a good disinfectant properties. The results of this study, ozone can be highly contaminated with E. coli was significantly effective in disinfecting water.