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Applied and Environmental Microbiology, July 2005, p. 4140-4143, Vol. 71, No. 7
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.7.4140-4143.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Impacts of Goethite Particles on UV Disinfection of Drinking Water

Youxian Wu, Thomas Clevenger,* and Baolin Deng

Department of Civil and Environmental Engineering, University of Missouri—Columbia, Columbia, Missouri 65211

Received 20 September 2004/ Accepted 26 January 2005

A unique association between bacterial cells and small goethite particles (~0.2 by 2 µm) protected Escherichia coli and Pseudomonas putida from UV inactivation. The protection increased with the particle concentration in the turbidity range of 1 to 50 nephelometric turbidity units and with the bacterium-particle attachment time prior to UV irradiation. The lower degree of bacterial inactivation at longer attachment time was mostly attributed to the particle aggregation surrounding bacteria that provided shielding from UV radiation.

* Corresponding author. Mailing address: Department of Civil and Environmental Engineering, University of Missouri—Columbia, Columbia, MO 65211. Phone: (573) 882-7564. Fax: (573) 882-4784. E-mail: clevengert{at}Missouri.edu.

Applied and Environmental Microbiology, July 2005, p. 4140-4143, Vol. 71, No. 7
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.7.4140-4143.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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