The results of a batch-process solar disinfection (SODIS) and solar photocatalytic disinfection (SPCDIS) on drinking water contaminated
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 Cryptosporidium
contamination.