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ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT PHYSICAL REMOVAL OF CRYPTOSPORIDIUM OOCYSTS AND GIARDIA CYSTS IN DRINKING WATER PALL CORPORATION WPM-1 MICROFILTRATION SYSTEM AT PITTSBURGH, PA - NSF 00/09/EPADW395
Citation:
NSF International. ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT PHYSICAL REMOVAL OF CRYPTOSPORIDIUM OOCYSTS AND GIARDIA CYSTS IN DRINKING WATER PALL CORPORATION WPM-1 MICROFILTRATION SYSTEM AT PITTSBURGH, PA - NSF 00/09/EPADW395. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-03/009.
Description:
Verification testing of the Pall Corporation WPM-1 Microfiltration Pilot System was conducted from February 3 to March 5, 1999. The Pall WPM-1 membrane is a hollow fiber type microfiltration membrane made of polyvinylidenefluoride (PVDF). It has a 0.1 micrometer ( m) nominal pore size and utilizes outside-in flow. The treatment system underwent microbial challenge testing on February 5, 1999, and demonstrated a 5.8 log10 removal of Giardia cysts and a 6.8 log10 removal of Cryptosporidium oocysts. Source water characteristics were: turbidity average 0.10 Nephlometric Turbidity Units (NTU), pH 7.7, and temperature 3.6C. During the thirty-day verification test, the system was operated at a flux recommended by the manufacturer of 77 gallon per square foot per day (gfd) at 3.8C which equates to 120 gfd at 20 C. The average transmembrane pressure was 24 pounds per square inch (psi). The feed water recovery of the treatment system during the study was 96%. The effectiveness of the chemical cleaning process was measured by the recovery of specific flux and loss of original specific flux. Chemical cleaning was conducted at the end of the test period as required by the ETV Protocol. Data collected before and after the chemical cleaning was used to calculate recovery of specific flux and the loss of original specific flux. The chemical cleaning recovered 73% of the specific flux. System integrity was demonstrated as required by the ETV protocol. Tests were conducted on an intact membrane system and on one that had been intentionally compromised.