SODIS is a solar water disinfection process which works by exposing untreated water to the sun in plastic bottles. Field experiments were carried out in Cochabamba, Bolivia, to obtain standard UV-A (320–405 nm) dose values required to inactivate non-spore forming bacteria, spores of Bacillus subtilis, and wild type coliphages. Inactivation kinetics for non-spore forming bacteria are similar under SODIS conditions, exhibiting dose values ranging between 15 and 30 Wh m−2 for 1 log10 (90%) inactivation, 45 to 90 Wh m−2 for 3 log10 (99.9%), and 90 to 180 Wh m−2 for 6 log10 (99.9999%) inactivation. Pseudomonas aeruginosa was found to be the most resistant and Salmonella typhi, the most sensitive of the non-sporulating organisms studied here. Phages and spores serve as model organisms for viruses and parasite cysts. A UV-A dose of 85 to 210 Wh m−2 accumulated during one to two days was enough to inactivate 1 log10 (90%) of these strong biological structures. The process of SODIS depended mainly on the radiation dose [Wh m−2] an organism was exposed to. An irradiation intensity exceeding some 12 Wm−2 did not increase the inactivation constant. A synergistic effect of water temperatures below 50°C was not observed. Data plotting from various experiments on a single graph proved to be a reliable alternative method for analysis. Inactivation rates determined by this method were revealed to be within the same range as individual analysis.
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June 2007
This article was originally published in
Journal of Water Supply: Research and Technology-Aqua
Article Contents
Research Article|
June 01 2007
Effect of solar water disinfection (SODIS) on model microorganisms under improved and field SODIS conditions Free
Simon Dejung;
1Swiss Federal Institute for Environmental Science and Technology (EAWAG), P.O. Box 611, CH-8600, Dübendorf, Switzerland
Tel.: +41 -44 823 5073 Fax: +41 -44 823 5399; E-mail: [email protected]; www.sodis.ch
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Ivan Fuentes;
Ivan Fuentes
2Centro de Aguas y Saneamiento Ambiental (CASA), Universidad Mayor de San Simon, Facultad de Ciencias y Tecnología, C. Sucre y Parque La Torre, Cochabamba, Bolivia
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Gabriela Almanza;
Gabriela Almanza
2Centro de Aguas y Saneamiento Ambiental (CASA), Universidad Mayor de San Simon, Facultad de Ciencias y Tecnología, C. Sucre y Parque La Torre, Cochabamba, Bolivia
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Ruth Jarro;
Ruth Jarro
2Centro de Aguas y Saneamiento Ambiental (CASA), Universidad Mayor de San Simon, Facultad de Ciencias y Tecnología, C. Sucre y Parque La Torre, Cochabamba, Bolivia
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Lizeth Navarro;
Lizeth Navarro
2Centro de Aguas y Saneamiento Ambiental (CASA), Universidad Mayor de San Simon, Facultad de Ciencias y Tecnología, C. Sucre y Parque La Torre, Cochabamba, Bolivia
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Gina Arias;
Gina Arias
2Centro de Aguas y Saneamiento Ambiental (CASA), Universidad Mayor de San Simon, Facultad de Ciencias y Tecnología, C. Sucre y Parque La Torre, Cochabamba, Bolivia
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Evelin Urquieta;
Evelin Urquieta
2Centro de Aguas y Saneamiento Ambiental (CASA), Universidad Mayor de San Simon, Facultad de Ciencias y Tecnología, C. Sucre y Parque La Torre, Cochabamba, Bolivia
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Abraham Torrico;
Abraham Torrico
2Centro de Aguas y Saneamiento Ambiental (CASA), Universidad Mayor de San Simon, Facultad de Ciencias y Tecnología, C. Sucre y Parque La Torre, Cochabamba, Bolivia
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Wilma Fenandez;
Wilma Fenandez
2Centro de Aguas y Saneamiento Ambiental (CASA), Universidad Mayor de San Simon, Facultad de Ciencias y Tecnología, C. Sucre y Parque La Torre, Cochabamba, Bolivia
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Mercedes Iriarte;
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Mercedes Iriarte
2Centro de Aguas y Saneamiento Ambiental (CASA), Universidad Mayor de San Simon, Facultad de Ciencias y Tecnología, C. Sucre y Parque La Torre, Cochabamba, Bolivia
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Christof Birrer;
Christof Birrer
3Swiss Federal Institute of Technology (ETH), Seminar für Statistik, CH-8092, Zürich, Switzerland
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Werner A. Stahel;
Werner A. Stahel
3Swiss Federal Institute of Technology (ETH), Seminar für Statistik, CH-8092, Zürich, Switzerland
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Martin Wegelin
Martin Wegelin
1Swiss Federal Institute for Environmental Science and Technology (EAWAG), P.O. Box 611, CH-8600, Dübendorf, Switzerland
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Journal of Water Supply: Research and Technology-Aqua (2007) 56 (4): 245–256.
Article history
Received:
September 15 2005
Accepted:
February 02 2007
Citation
Simon Dejung, Ivan Fuentes, Gabriela Almanza, Ruth Jarro, Lizeth Navarro, Gina Arias, Evelin Urquieta, Abraham Torrico, Wilma Fenandez, Mercedes Iriarte, Christof Birrer, Werner A. Stahel, Martin Wegelin; Effect of solar water disinfection (SODIS) on model microorganisms under improved and field SODIS conditions. Journal of Water Supply: Research and Technology-Aqua 1 June 2007; 56 (4): 245–256. doi: https://doi.org/10.2166/aqua.2007.058
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