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ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT - PHYSICAL REMOVAL OF MICROBIOLOGICAL & PARTICULATE CONTAMINANTS IN DRINKING WATER: US FILTER 3M10C MICROFILTRATION MEMBRANE SYSTEM AT CHULA VISTA, CALIFORNIA
Citation:
NSF International, AND MWH Engineers. ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT - PHYSICAL REMOVAL OF MICROBIOLOGICAL & PARTICULATE CONTAMINANTS IN DRINKING WATER: US FILTER 3M10C MICROFILTRATION MEMBRANE SYSTEM AT CHULA VISTA, CALIFORNIA. EPA/600/R-08/123, 2003.
Impact/Purpose:
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Description:
Verification testing of the US Filter 3M10C membrane system was conducted over a 44-day test period at the Aqua 2000 Research Center in Chula Vista, California. The test period extended from July 24, 2002 to September 5, 2002. The source water was a blend of Colorado River and State Project Water. Verification testing was conducted at manufacturer-specified operating conditions. The membrane unit was operated in dead-end mode at a constant flux of 24 gfd (41 L/hr-m2) with feedwater recovery of 91 percent. The membrane showed some fouling at the end of the test period. The manufacturer-recommended cleaning procedure was effective in recovering membrane productivity. Additional data was added to this report from previous California Department of Health Services (CDHS) testing (conducted independently from ETV testing) on the system to supplement particle removal data. Raw water particle counts differed between the ETV testing period and the CDHS testing period; the average for the 3-5 micron size range during the ETV testing was 1,100 particles/mL and the average for the 2-5 micron size range during the CDHS testing was 2,000 particles/mL. The average raw water count for the 5-15 micron size range for the ETV testing was 950 particles/mL whereas during the CDHS testing it was 810 particles/mL. During the ETV testing the membrane system achieved particle removals in the range 2.3 log to 3.5 log with an average of 3.1 log for the 3-5 micron size range, and particle removal in the range 2.7 log to 3.6 log with an average of 3.1 log for the 5-15 micron size range. For the CDHS testing, particle removals observed were in the range 2.6 log to 4.7 log with an average of 3.8 log for the 2-5 micron size range and particle removal in the range 2.6 log to 4.3 log with an average of 3.9 log for the 5-15 micron size range.