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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front.Environ.Sci.Eng.    2014, Vol. 8 Issue (4) : 547-552    https://doi.org/10.1007/s11783-013-0620-2
RESEARCH ARTICLE
E. coli and bacteriophage MS2 disinfection by UV, ozone and the combined UV and ozone processes
Jingyun FANG1,2,*(),Huiling LIU1,Chii SHANG3,Minzhen ZENG4,Mengling NI2,Wei LIU2,*()
1. State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin 150090, China
2. School of Environmental Science and Technology, Sun Yat-Sen University, Guangzhou 510275, China
3. Department of Civil and Environmental Engineering, the Hong Kong University of Science and Technology, Hong Kong, China
4. Water & Urban Development, AECOM Asia Co. Ltd., Hong Kong, China
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Abstract

The combination of low-dose ozone with ultraviolet (UV) irradiation should be an option to give benefit to disinfection and reduce drawbacks of UV and ozone disinfection. However, less is known about the disinfection performance of UV and ozone (UV/ozone) coexposure and sequential UV-followed-by-ozone (UV-ozone) and ozone-followed-by-UV (ozone-UV) exposures. In this study, inactivation of E. coli and bacteriophage MS2 by UV, ozone, UV/ozone coexposure, and sequential UV-ozone and ozone-UV exposures was investigated and compared. Synergistic effects of 0.5–0.9 log kill on E. coli inactivation, including increases in the rate and efficiency, were observed after the UV/ozone coexposure at ozone concentrations as low as 0.05 mg·L-1 in ultrapure water. The coexposure with 0.02-mg·L-1 ozone did not enhance the inactivation but repressed E. coli photoreactivation. Little enhancement on E. coli inactivation was found after the sequential UV-ozone or ozone-UV exposures. The synergistic effect on MS2 inactivation was less significant after the UV/ozone coexposure, and more significant after the sequential ozone-UV and UV-ozone exposures, which was 0.2 log kill for the former and 0.8 log kill for the latter two processes, at ozone dose of 0.1 mg·L-1 and UV dose of 8.55 mJ·cm-2 in ultrapure water. The synergistic effects on disinfection were also observed in tap water. These results show that the combination of UV and low-dose ozone is a promising technology for securing microbiological quality of water.

Keywords bacteria inactivation      photoreactivation      water disinfection      UV      ozone     
Corresponding Author(s): Jingyun FANG   
Issue Date: 11 June 2014
 Cite this article:   
Jingyun FANG,Huiling LIU,Chii SHANG, et al. E. coli and bacteriophage MS2 disinfection by UV, ozone and the combined UV and ozone processes[J]. Front.Environ.Sci.Eng., 2014, 8(4): 547-552.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0620-2
https://academic.hep.com.cn/fese/EN/Y2014/V8/I4/547
parameterwater quality
pH6.9–7.3
TOC/(mg·L-1)0.2–0.4
alkalinity/(mg·L-1 as CaCO3)26–30
chloride/μM390–400
bromide/μM0.02–0.04
nitrate/μM32–34
sulfate/μM140–150
Tab.1  Water quality of tap water
Fig.1  Disinfection kinetics of E. coli in (a) ultrapure water and (b) tap water by UV, ozone and UV/ozone. UV irradiance 0.19 mW·cm-2, ozone dose 0.05 mg·L-1, temperature 22°C±1°C, pH 7
Fig.2  Disinfection kinetics of MS2 in (a) ultrapure water and (b) tap water by UV, ozone and UV/ozone. UV irradiance 0.19 mW·cm-2, ozone dose 0.1 mg·L-1, temperature 22°C±1°C, pH 7
Fig.3  Comparison of log inactivation of (a) E. coli and (b) MS2 by the UV/ozone coexposure and the sequential UV-ozone and ozone-UV exposures. UV irradiance 0.19 mW·cm-2, exposure time 30 s (E. coli) and 45 s (MS2), ozone dose 0.05 mg·L-1 (E. coli) and 0.10 mg·L-1 (MS2), temperature 22°C±1°C, pH 7
Fig.4  Benefits of ozone addition to the repression of photoreactivation of E. coli after the UV/ozone coexposure in ultrapure water. UV irradiance 0.19 mW·cm-2, coexposure time 40 s, photoreactivation time 3 h, temperature 22°C±1°C, pH 7
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