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ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT PHYSICAL REMOVAL CRYPTOSPROIDIUM OOCYSTS AND GIARDIA CYSTS IN DRINKING WATER
Citation:
ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT PHYSICAL REMOVAL CRYPTOSPROIDIUM OOCYSTS AND GIARDIA CYSTS IN DRINKING WATER. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-03/013, 2000.
Description:
Verification testing of the ZENON Environmental Inc. ZeeWeed ZW-500 UF Drinking Water System was conducted from February 6 to March 7, 1999. The treatment system underwent Giardia and Cryptosporidium removal challenge testing on March 2, 1999, and demonstrated a 5.3 log10 removal of Giardia cysts and a 6.4 log10 removal of Cryptosporidium oocysts. Source water characteristics were: turbidity average 0.09 Nephlometric Turbidity Units (NTU), pH 7.8, and temperature 3.8oC. During the thirty-day verification test, the system was operated at a flux recommended by the manufacturer of 53 gallons per square foot per day (gfd) at 39oF (3.8oC) 91 liters per meter squared per hour [1/m2/h]) which equates to 94 gfd at 68oF (169 l/m2/h at 20oC). The average transmembrane pressure was 7.5 pounds per square inch (psi) (0.52 bar [b]). The feed water recovery of the treatment system during the study was 95%. Chemical cleaning of the treatment system was conducted as part of the verification testing.