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Superfund Innovative Technology Evaluation (SITE)

 EPA/540/R-94/501

Note: EPA no longer updates this information, but it may be useful as a reference or resource.

  Colloid Polishing Filter Method - Filter Flow Technology, Inc.
May 1995
Capsule (540/R-94/501a)

Filter Flow Technology Inc.'s CPFM uses an Filter Flow (FF) 1000 to remove radionuclide and heavy metal pollutants from water by a combination of sorption, chemical complexing, and filtration. The FF 1000 is contained within filter packs which are dewatered with compressed air after use. The end products are water with reduced contaminant concentrations and spent FF 1000. The CPFM technology was demonstrated at the U.S. Department of Energy's Rocky Flats Plant in Denver, Colorado, in September 1993. The CPFM treated a total of 10,000 gallons of water containing approximately 100mg/L of uranium and 100 pCi/L per liter of gross alpha-contaminated water. Three tests, consisting of a total of five runs, were conducted. For the first test, consisting of three runs conducted at the same operating conditions, the CPFM system removed 58 to 91 % of uranium and 33 to 87% of gross alpha contamination from groundwater that had no pretreatment. For the second test, using groundwater pretreated with sodium sulfide, the removal efficiency was improved to 95% for uranium and 94% gross alpha contamination. The third test was inconclusive.

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