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ETV STATEMENT - PHYSICAL REMOVAL OF CRYPTOSPORIDIUM OOCYSTS AND GIARDIA CYSTS IN DRINKING WATER - ZENON ZEEWEED ZW500 ULTRAFILTRATION MEMBRANE SYSTEM AT PITTSBURGH, PA
Citation:
NSF International. ETV STATEMENT - PHYSICAL REMOVAL OF CRYPTOSPORIDIUM OOCYSTS AND GIARDIA CYSTS IN DRINKING WATER - ZENON ZEEWEED ZW500 ULTRAFILTRATION MEMBRANE SYSTEM AT PITTSBURGH, PA. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-03/013 (NTIS NSF 00/06/EPADW395).
Description:
Verification testing of the ZENON Environmental Inc. ZeeWeed ZW500 UF Drinking Water System was conducted from 2/6-3/7/99. The treatment system underwent Giardia and Cryptosporidium removal challenge testing on 3/2/99 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 3.8C. During the 30 day verification test, the system was operated at a flux recommended by the manufacturer of 53 gallons per sq ft/day (gfd) at 39F (3.8C) (91 liters per meter squared per hr [l/m2/h]) which equates to 94 gfd at 68F (169 l/m2/h at 20C). The average transmembrane pressure was 7.5 psi (0.52 bar). 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.