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ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT - PHYSICAL REMOVAL OF MICROBIOLOGICAL AND PARTICULATE CONTAMINANTS IN DRINKING WATER : SEPARMATIC™ FLUID SYSTEMS DIATOMACEOUS EARTH PRESSURE TYPE FILTER SYSTEM MODEL 12P-2
NSF International. ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT - PHYSICAL REMOVAL OF MICROBIOLOGICAL AND PARTICULATE CONTAMINANTS IN DRINKING WATER : SEPARMATIC™ FLUID SYSTEMS DIATOMACEOUS EARTH PRESSURE TYPE FILTER SYSTEM MODEL 12P-2. U.S. Environmental Protection Agency, Washington, DC.
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The verification test of the SeparmaticTM DE Pressure Type Filter System Model 12P-2 was conducted at the UNH Water Treatment Technology Assistance Center (WTTAC) in Durham, New Hampshire. The source water was finished water from the Arthur Rollins Treatment Plant that was pretreated with a 15 micron (m) string pre-filter and stored in tanks prior to use as feed water to the system. The system was operated with a 0.2 pounds per square foot (lb/ft2) precoat of Hyflo Super Cel DE and a body feed of 2 milligrams per liter (mg/L) of Celite 503 DE during the verification test. The system was operated for approximately 360 hours over 22 filter runs. The filter runs averaged approximately 16 hours in duration. The average flow rate ranged from 1.54 to 1.78 gallons per minute (gpm). Initial differential pressure averaged 7.9 pounds per square inch (psi), while ending differential pressure averaged 24.7 psi. The average feed water cumulative (2 to >15 m) particle counts during the verification test were 47 counts per milliliter (mL), and the average effluent cumulative particle counts were 8 counts per mL. The average feed water online turbidity reading was 0.20 nephelometric turbidity units (NTU), and the average effluent turbidity reading was 0.13 NTU. During three of the filter runs, an initial Cryptosporidium oocyst challenge was performed during the first 1.5 hours of operation, and a second challenge was performed at 85% of terminal headloss (approximately 21 psi) during the filter run. The results of the six Cryptosporidium oocyst challenges indicated oocyst log10 removals ranging from 3.1 to 5.2 with an average of 4.2.