Solar disinfection of drinking water (SODIS): an investigation of the effect of UV-A dose on inactivation efficiency

Eunice Ubomba-Jaswa, Christian Navntoft, M. Inmaculada Polo-López, P Fernandez Ibanez, Kevin G. McGuigan

Research output: Contribution to journalArticle

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Abstract

The effect of solar UV-A irradiance and solar UV-A dose on the inactivation of Escherichia coli K-12 using solar disinfection (SODIS) was studied. E. coli K-12 was seeded in natural well-water contained in borosilicate glass tubes and exposed to sunlight at different irradiances and doses of solar UV radiation. In addition, E. coli K-12 was also inoculated into poly(ethylene) terephthalate (PET) bottles and in a continuous flow system (10 L min-1) to determine the effect of an interrupted and uninterrupted solar dose on inactivation. Results showed that inactivation from approximately106 CFU mL-1 to below the detection level (4 CFU/mL) for E. coli K-12, is a function of the total uninterrupteddosedeliveredtothebacteriaandthattheminimumdoseshouldbe>108kJm-2 forthe conditions described (spectral range of 0.295–0.385 mm). For complete inactivation to below the limit of detection, this dose needs to be received regardless of the incident solar UV intensity and needs to be delivered in a continuous and uninterrupted manner. This is illustrated by a continuous flow system in which bacteria were not fully inactivated (residual viable concentration ~102 CFU/mL) even after 5 h of exposure to strong sunlight and a cumulative dose of >108 kJ m-2 . This has serious implications for attempts to scale-up solar disinfection through the use of re-circulatory continuous flow reactors.
LanguageEnglish
Pages587
JournalPhotochemical & Photobiological Sciences
Volume8
Issue number5
DOIs
Publication statusPublished - 30 Dec 2008

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Disinfection
Drinking Water
Escherichia coli
Polyethylene Terephthalates
Borosilicate glass
Bottles
Solar radiation
Ultraviolet radiation
Dosimetry
Bacteria
Water

Keywords

  • UVA lethal dose
  • compele disinfection
  • compound parabolic collector

Cite this

Ubomba-Jaswa, Eunice ; Navntoft, Christian ; Polo-López, M. Inmaculada ; Fernandez Ibanez, P ; McGuigan, Kevin G. / Solar disinfection of drinking water (SODIS): an investigation of the effect of UV-A dose on inactivation efficiency. In: Photochemical & Photobiological Sciences. 2008 ; Vol. 8, No. 5. pp. 587.
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Solar disinfection of drinking water (SODIS): an investigation of the effect of UV-A dose on inactivation efficiency. / Ubomba-Jaswa, Eunice; Navntoft, Christian; Polo-López, M. Inmaculada; Fernandez Ibanez, P; McGuigan, Kevin G.

In: Photochemical & Photobiological Sciences, Vol. 8, No. 5, 30.12.2008, p. 587.

Research output: Contribution to journalArticle

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T1 - Solar disinfection of drinking water (SODIS): an investigation of the effect of UV-A dose on inactivation efficiency

AU - Ubomba-Jaswa, Eunice

AU - Navntoft, Christian

AU - Polo-López, M. Inmaculada

AU - Fernandez Ibanez, P

AU - McGuigan, Kevin G.

PY - 2008/12/30

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N2 - The effect of solar UV-A irradiance and solar UV-A dose on the inactivation of Escherichia coli K-12 using solar disinfection (SODIS) was studied. E. coli K-12 was seeded in natural well-water contained in borosilicate glass tubes and exposed to sunlight at different irradiances and doses of solar UV radiation. In addition, E. coli K-12 was also inoculated into poly(ethylene) terephthalate (PET) bottles and in a continuous flow system (10 L min-1) to determine the effect of an interrupted and uninterrupted solar dose on inactivation. Results showed that inactivation from approximately106 CFU mL-1 to below the detection level (4 CFU/mL) for E. coli K-12, is a function of the total uninterrupteddosedeliveredtothebacteriaandthattheminimumdoseshouldbe>108kJm-2 forthe conditions described (spectral range of 0.295–0.385 mm). For complete inactivation to below the limit of detection, this dose needs to be received regardless of the incident solar UV intensity and needs to be delivered in a continuous and uninterrupted manner. This is illustrated by a continuous flow system in which bacteria were not fully inactivated (residual viable concentration ~102 CFU/mL) even after 5 h of exposure to strong sunlight and a cumulative dose of >108 kJ m-2 . This has serious implications for attempts to scale-up solar disinfection through the use of re-circulatory continuous flow reactors.

AB - The effect of solar UV-A irradiance and solar UV-A dose on the inactivation of Escherichia coli K-12 using solar disinfection (SODIS) was studied. E. coli K-12 was seeded in natural well-water contained in borosilicate glass tubes and exposed to sunlight at different irradiances and doses of solar UV radiation. In addition, E. coli K-12 was also inoculated into poly(ethylene) terephthalate (PET) bottles and in a continuous flow system (10 L min-1) to determine the effect of an interrupted and uninterrupted solar dose on inactivation. Results showed that inactivation from approximately106 CFU mL-1 to below the detection level (4 CFU/mL) for E. coli K-12, is a function of the total uninterrupteddosedeliveredtothebacteriaandthattheminimumdoseshouldbe>108kJm-2 forthe conditions described (spectral range of 0.295–0.385 mm). For complete inactivation to below the limit of detection, this dose needs to be received regardless of the incident solar UV intensity and needs to be delivered in a continuous and uninterrupted manner. This is illustrated by a continuous flow system in which bacteria were not fully inactivated (residual viable concentration ~102 CFU/mL) even after 5 h of exposure to strong sunlight and a cumulative dose of >108 kJ m-2 . This has serious implications for attempts to scale-up solar disinfection through the use of re-circulatory continuous flow reactors.

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KW - compele disinfection

KW - compound parabolic collector

U2 - 10.1039/b816593a

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SN - 1474-905X

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