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Disinfection of drinking water contaminated with Cryptosporidium parvum oocysts under natural sunlight and using the photocatalyst TiO2

Méndez-Hermida, Fernando, Ares-Mazás, Elvira, McGuigan, Kevin G., Boyle, Maria, Sichel, Cosima and Fernandez Ibanez, P (2007) Disinfection of drinking water contaminated with Cryptosporidium parvum oocysts under natural sunlight and using the photocatalyst TiO2. Journal of Photochemistry and Photobiology B: Biology, 88 (2-3). pp. 105-111. [Journal article]

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URL: http://dx.doi.org/10.1016/j.jphotobiol.2007.05.004

DOI: 10.1016/j.jphotobiol.2007.05.004

Abstract

The results of a batch-process solar disinfection (SODIS) and solar photocatalytic disinfection (SPCDIS) on drinking water contam- inated with Cryptosporidium are reported. Cryptosporidium parvum oocyst suspensions were exposed to natural sunlight in Southern Spain and the oocyst viability was evaluated using two vital dyes [40,6-diamidino-2-phenylindole (DAPI) and propidium iodide (PI)]. SODIS exposures (strong sunlight) of 8 and 12 h reduced oocyst viability from 98% (±1.3%) to 11.7% (±0.9%) and 0.3% (±0.33%), respectively. SODIS reactors fitted with flexible plastic inserts coated with TiO2 powder (SPCDIS) were found to be more effective than those which were not. After 8 and 16 h of overcast and cloudy solar irradiance conditions, SPCDIS reduced oocyst viability from 98.3% (±0.3%) to 37.7% (±2.6%) and 11.7% (±0.7%), respectively, versus to that achieved using SODIS of 81.3% (±1.6%) and 36.0% (±1.0%), respectively. These results confirm that solar disinfection of drinking water can be an effective household intervention against Cryptos- poridium contamination.

Item Type:Journal article
Keywords:DAPI 40,6-diamidino-2-phenylindole PI propidium iodide SODIS solar disinfection SPCDIS solar photocatalytic disinfection
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:37918
Deposited By: Dr Pilar Fernandez-Ibanez
Deposited On:30 May 2017 08:24
Last Modified:17 Oct 2017 16:29

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