A review of Cryptosporidium removal by granular media filtration
2005
This article consolidates and updates available information on Cryptosporidium removal by filtration, with a focus on optimal and suboptimal filtration performance. Emphasis was placed on integrating various strategies for optimizing filtration processes with the most current information regarding pathogen removal by filtration. As this review underscores, in response to regulations such as the Interim Enhanced Surface Water Treatment Rule (IESWTR) and the Long Term 2 ESWTR, there is a need to develop methods to compare the relative effectiveness of treatment alternatives and to understand the most significant operational effects on filter performance. In many cases, filters operated at or near optimal conditions can achieve in the vicinity of 3-log (or better) removal of Cryptosporidium. Operational conditions such as coagulant upsets and end-of-run (early breakthrough) filtration may significantly decrease oocyst removal by drinking water filters, even when filter effluent turbidities are low (<0.3 ntu).
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