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This study examined the impacts of oocyst preservation method and age on the removal of seeded Cryptosporidiumoocysts by in-line filtration. An existing study has investigated the infectivity of Cryptosporidium parvum as afunction of preservation method and oocyst age. However, similar studies have not been performed to investigatethe impacts of preservation method and oocyst age on the physical removal of Cryptosporidium. Previous pilot scaleseeding studies have used fresh oocysts stored under controlled conditions. However, full-scale drinkingwater treatment plants encounter oocysts of widely different ages on a daily basis. Differences in age andenvironment may affect Cryptosporidium removal efficiency through water treatment. As a result, the data fromthis study may help drinking water utilities better evaluate and apply other published data to their situation.In the current study, oocysts from the same production lot were divided and preserved using different methods.Oocysts from each preservation method were then seeded into pilot-scale in-line filters at 2, 8 and 17 weeks of age.No statistically significant (95% confidence level) differences in removals as a function of age or preservationmethod were observed. Depending on the preservation method and age, observed average Cryptosporidiumremovals ranged from 3.5 to 4.0 log. Includes 15 references, tables, figures.

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Edition: Vol. - No. Published: 11/02/2003 Number of Pages: 20File Size: 1 file , 400 KB