Méndez-Hermida Fernando, Ares-Mazás Elvira, McGuigan Kevin G, Boyle Maria, Sichel Cosima, Fernández-Ibáñez Pilar
Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Santiago de Compostela, Santiago de Compostela, Spain.
J Photochem Photobiol B. 2007 Sep 25;88(2-3):105-11. doi: 10.1016/j.jphotobiol.2007.05.004. Epub 2007 May 29.
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 [4',6-diamidino-2-phenylindole (DAPI) and propidium iodide (PI)]. SODIS exposures (strong sunlight) of 8 and 12h 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.
报告了分批处理太阳能消毒（SODIS）和太阳能光催化消毒（SPCDIS）对受隐孢子虫污染的饮用水的处理结果。将微小隐孢子虫卵囊悬浮液置于西班牙南部的自然阳光下，并使用两种活性染料[4',6-二脒基-2-苯基吲哚（DAPI）和碘化丙啶（PI）]评估卵囊的活力。8小时和12小时的SODIS暴露（强光照射）分别将卵囊活力从98%（±1.3%）降至11.7%（±0.9%）和0.3%（±0.33%）。发现装有涂有TiO2粉末的柔性塑料内衬的SODIS反应器（SPCDIS）比未装的更有效。在阴天和多云的太阳辐照条件下暴露8小时和16小时后，SPCDIS分别将卵囊活力从98.3%（±0.3%）降至37.7%（±2.6%）和11.7%（±0.7%），而使用SODIS分别为81.3%（±1.6%）和36.0%（±1.0%）。这些结果证实，饮用水的太阳能消毒可以成为一种有效的家庭干预措施，以应对隐孢子虫污染问题。
