Solar disinfection of poliovirus and Acanthamoeba polyphaga cysts in water – a laboratory study using simulated sunlight

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AimsTo determine the efficacy of solar disinfection (SODIS) in disinfecting water contaminated with poliovirus and Acanthamoeba polyphaga cysts.Methods and ResultsOrganisms were subjected to a simulated global solar irradiance of 850 Wm−2 in water temperatures between 25 and 55°C. SODIS at 25°C totally inactivated poliovirus after 6-h exposure (reduction of 4·4 log units). No SODIS-induced reduction in A. polyphaga cyst viability was observed for sample temperatures below 45°C. Total cyst inactivation was only observed after 6-h SODIS exposure at 50°C (3·6 log unit reduction) and after 4 h at 55°C (3·3 log unit reduction).ConclusionsSODIS is an effective means of disinfecting water contaminated with poliovirus and A. polyphaga cysts, provided water temperatures of 50–55°C are attained in the latter case.Significance and Impact of the StudyThis research presents the first SODIS inactivation curve for poliovirus and provides further evidence that batch SODIS provides effective protection against waterborne protozoan cysts.

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