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Applied and Environmental Microbiology, February 2004, p. 1129-1134, Vol. 70, No. 2
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.2.1129-1134.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Inactivation of Escherichia coli by Photochemical Reaction of Ferrioxalate at Slightly Acidic and Near-Neutral pHs

Min Cho,1 Yunho Lee,1 Hyenmi Chung,2 and Jeyong Yoon1*

School of Chemical Engineering, College of Engineering, Seoul National University, Sillim-dong, Gwanak-gu, Seoul 151-742,1 Water Microbiology Division, National Institute of Environmental Research, Kyungseo-dong, Seo-gu, Inchon 404-170, South Korea2

Received 28 July 2003/ Accepted 10 November 2003

Fenton chemistry, which is known to play an effective role in degrading toxic chemicals, is difficult to apply to disinfection in water treatment, since its reaction is effective only at the acidic pH of 3. The presence of oxalate ions and UV-visible light, which is known as a photoferrioxalate system, allows the Fe(III) to be dissolved at slightly acidic and near-neutral pHs and maintains the catalytic reaction of iron. This study indicates that the main oxidizing species in the photoferrioxalate system responsible for microorganism inactivation is OH radical. Escherichia coli was used as an indicator microorganism. The CT value (OH radical concentration x contact time; used to indicate the effect of the combination of the concentration of the disinfectant and the contact time on inactivation) for a 2-log inactivation of E. coli was approximately 1.5 x 10-5 mg/liter/min, which is approximately 2,700 times lower than that of ozone as estimated by the delayed Chick-Watson model. Since the light emitted by the black light blue lamp is similar to sunlight in the specific wavelength range of 300 to 420 nm, the photoferrioxalate system, which can have a dual function, treating water for both organic pollutants and microorganisms simultaneously, shows promise for the treatment of water or wastewater in remote or rural sites. However, the photoferrioxalate disinfection system is slower in inactivating microorganisms than conventional disinfectants are.

* Corresponding author. Mailing address: School of Chemical Engineering, College of Engineering, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul 151-742, Korea. Phone: 82-2-880-8927. Fax: 82-2-876-8911. E-mail: jeyong{at}snu.ac.kr.

Applied and Environmental Microbiology, February 2004, p. 1129-1134, Vol. 70, No. 2
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.2.1129-1134.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Whittaker, M. M., Pan, H.-Y., Yukl, E. T., Whittaker, J. W. (2007). Burst Kinetics and Redox Transformations of the Active Site Manganese Ion in Oxalate Oxidase: IMPLICATIONS FOR THE CATALYTIC MECHANISM. J. Biol. Chem. 282: 7011-7023 [Abstract] [Full Text]  


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