[Study on UV and H2O2 combined inactivation of E. coli in drinking water].
The inactivation effect of E. coli with both UV irradiation and hydrogen peroxide disinfection individually and in different combination modes was investigated. The results showed that hydrogen peroxide alone caused hardly any inactivation of E. coli. Only 0.02 lg inactivation was achieved by hydrogen peroxide with concentration of 20 mg x L(-1) and contact time of 30 min. UV irradiation was able to inactivate E. coli to a certain extent. The inactivation reached 4.51 lg at a UV dose of 10 mJ x cm(-2). The combination of UV and H2O2 could significantly improve the inactivation effect and the different combination modes affected the inactivation effect. The inactivation effect of UV-H2O2 was better than that of H2O2 -UV. The inactivation was increased by 0.09, 0.35, 0.38, 0.68 lg and 0.01, 0.07, 0.14, 0.53 lg when compared to the treatment with solely UV irradiation, respectively, at UV dose of 5 mJ x cm(-2) with hydrogen peroxide at contact time of 2.5, 5, 10, 20 minutes. UV/H2O2 achieved better results than sequential disinfection. The inactivation was enhanced by 0.43 lg and 0.58 lg when compared to UV-H2O2 and H2O2-UV, respectively, at UV dose of 5 mJ x cm(-2) with hydrogen peroxide at contact time of 20 minutes. The inactivation of E. coli increased with the enhancement of UV radiation intensity.
Key Laboratory of Yangtze River Water Environment, Ministry of Education (Tongji University), Shanghai 200092, China. hfzyq1991@126.com
Yi-Qing
YQ
Zhang
Ling-Ling
LL
Zhou
Yong-Ji
YJ
Zhang
D004203:Disinfection / Q000379:methods*; D060766:Drinking Water / Q000032:analysis / Q000382:microbiology*; D004926:Escherichia coli / Q000187:drug effects / Q000528:radiation effects*; D006861:Hydrogen Peroxide / Q000737:chemistry / Q000494:pharmacology*; D050296:Microbial Viability / Q000528:radiation effects; D014466:Ultraviolet Rays; D014871:Water Microbiology
D060766:Drinking Water; D006861:Hydrogen Peroxide