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Abstract
Filtration efficiency tests were conducted on fiberglass mat filter media with (a) DOP aerosol having a count median diameter of 0.8 µm and a geometric standard deviation of 1.65, and (b) uniform polystyrene latex spheres of 0.36, 0.66, 0.80, and 1.1 µm diameter over a face velocity range of 500 to 3000 fpm.
Filtration of submicron aerosol particles by a fibrous filter is characterized by a face velocity that yields a minimum collection efficiency. Removal efficiency increased with increasing velocity for liquid DOP aerosol particles, but the solid polystyrene latex aerosols showed a significantly different penetration vs. velocity relationship in the high velocity filtration region. These differences are partially explained by assuming that only a fraction of the polystyrene latex particles adhere on contact and the remainder rebound back into the air stream.
When compared to a high energy scrubber, the advantages of high velocity filtration for submicron industrial effluents are (a) compactness of equipment with opportunities for significant reductions in acquisition and installation costs, (b) collection efficiency high enough to meet modern emission control regulations, and (c) a dry collection method that requires no water supply or disposal facility.