Evaluation of the solar water disinfection process (SODIS) against Cryptosporidium parvum using a 25-L static solar reactor fitted with a compound parabolic collector (CPC).
Water samples of 0, 5, and 30 nephelometric turbidity units (NTU) spiked with Cryptosporidium parvum oocysts were exposed to natural sunlight using a 25-L static solar reactor fitted with a compound parabolic collector (CPC). The global oocyst viability was calculated by the evaluation of the inclusion/exclusion of the fluorogenic vital dye propidium iodide and the spontaneous excystation. After an exposure time of 8 hours, the global oocyst viabilities were 21.8 ± 3.1%, 31.3 ± 12.9%, and 45.0 ± 10.0% for turbidity levels of 0, 5, and 30 NTU, respectively, and these values were significantly lower (P < 0.05) that the initial global viability of the isolate (92.1 ± 0.9%). The 25-L static solar reactor that was evaluated can be an alternative system to the conventional solar water disinfection process for improving the microbiological quality of drinking water on a household level, and moreover, it enables treatment of larger volumes of water (> 10 times).
Laboratorio de Parasitología, Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad de Santiago de Compostela, Santiago de Compostela, A Coruña, Spain. maria.fontan@usc.es
María
M
Fontán-Sainz
Hipólito
H
Gómez-Couso
Pilar
P
Fernández-Ibáñez
Elvira
E
Ares-Mazás
D019149:Bioreactors; D004396:Coloring Agents / Q000378:metabolism; D016785:Cryptosporidium parvum / Q000166:cytology / Q000472:pathogenicity / Q000528:radiation effects*; D004203:Disinfection / Q000379:methods*; D004307:Dose-Response Relationship, Radiation; D060766:Drinking Water / Q000469:parasitology*; D009391:Nephelometry and Turbidimetry / Q000379:methods; D033661:Oocysts / Q000528:radiation effects; D011419:Propidium / Q000378:metabolism; D013472:Sunlight; D018508:Water Purification / Q000379:methods*
D004396:Coloring Agents; D060766:Drinking Water; D011419:Propidium