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Ultraviolet (UV) light technology is gaining groundas an effective and inexpensive disinfectant forcontrol of Cryptosporidium in drinking water.Previous researchers examining the effects of UV havefocused only on UV inactivation of Iowa strain oocysts.However, to accurately assess the technology's efficacyand applicability to drinking water treatment, moreinformation was needed on the UV dose-response ofother Cryptosporidium strains infectious to humans.This study investigated the effect of UV doses rangingfrom 5 to 40 mJ/cmsup2/sup on five strains of C. parvum -Iowa, Moredun, Texas Asup2/supachieved at least 4-logsub10/sub inactivation for all strainsevaluated, and most strains were susceptible at evenlower UV doses, e.g., 2-5 mJ/cmsup2/sup.With the promulgation of new regulations by theUS Environmental Protection Agency, UV is movingahead as a best available technology for controllingCryptosporidium oocysts in drinking water supplies.The results of this study give utility managers a greaterunderstanding of and increased confidence in UVtreatment for inactivation of a variety ofCryptosporidium strains. Includes 64 references, tables, figures.

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Edition: Vol. 96 - No. 3 Published: 03/01/2004 Number of Pages: 10 File Size: 1 file , 4.1 MB