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Available literature data indicate that Cryptosporidium oocysts are removed moreefficiently than aerobic spore forming bacteria during water treatment processes involvingclarification and filtration. Therefore, monitoring removal of naturally occurring aerobic sporescan provide a conservative estimate of the Cryptosporidium removal in full-scale water treatmentprocesses, which in turn can be used to establish the demonstration of performance (DOP) creditallowed by the LT2ESWTR, as well as providing a valuable performance evaluation tool forwater plant operators.Results from this study showed that: median raw water levels ranged from 300 to3,000 spores/L for two lake sources and 80,000 to 400,000 spores/L in four river sources;median filtered water spore levels rarely exceeded 5 spores/L and these levels of removal werenot apparently dependent on source water concentration; and, 4-log spore removal could notbe demonstrated unless raw water levels exceeded 10,000 spores/L (e.g., river sources). Includes 12 references, table, figures.

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Edition: Vol. - No. Published: 06/17/2005 Number of Pages: 11File Size: 1 file , 1.3 MB