AWWA JAW39329
Journal AWWA - Removing Cryptosporidium Using Multimedia Filters
Journal Article by American Water Works Association , 12/01/1995
Ongerth, Jerry E.;Pecoraro, Julie Proctor
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A pilot-scale water filtration plant was used to measure removal efficiencies of Cryptosporidium oocysts and Giardia cysts simultaneously. The 1-gpm pilot plant using multimedia filters was operated in the direct filtration mode at 5 gpm/sq ft. Raw water was well conditioned by pH adjustment and alum coagulation. Carefully prepared and counted Cryptosporidium oocysts and Giardia cysts were seeded into the raw water continuously during test filter runs. Plant performance was characterized by analysis of samples collected before and after filtration. After a ripening period, removals observed in the optimal runs for Cryptosporidium averaged from 2.7 to 3.1 logs, and removals for Giardia averaged from 3.1 to 3.5 logs. Includes 21 references, tables, figures.
