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Removal of 12 nm particles from UPW by a combination of Ultrafiltration Modules and Microfiltration Cartridges


Donald C Grant, Dennis Chilcote - CT Associates, Inc., Eden Prairie, MN
Uwe Beuscher - W.L. Gore and Associates, Inc., Elkton, MD


This paper describes a new method that allows the measurement of filter retention efficiency for particles as small as 5 nm in diameter. A particle detection technique has been developed where the UPW is aerosolized and the particle size and concentrations are measured using conventional aerosol particle detection instrumentation. This detection technique was employed to evaluate the filtration performance of UF and MF devices like those used in many UPW systems today. In addition to characterizing the individual cartridges, the combination of UF and MF was tested to optimize particle retention performance.

CTA publication #112: Ultrapure Water Journal, May/June 2012

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