Filtration of Airborne Particulates By Gravel Filters: II. Collection Efficiency And Pressure Drop In Filtering Fume

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The collection efficiency of gravel layers to remove ammonium chloride fume from dry air streams is initially low, but increases sharply with increasing particulate load W on the gravel. The pressure drop ΔP across the gravel layer is low and changes little with particulate load until it reaches a threshold load W/P , whereupon AP increases abruptly with erratic fluctuations. The effects of gravel size, layer thickness, and air flow velocity upon Δ vs. W, AP vs. W, WP, and the cumulative collection efficiency from zero load to WP are presented. The application of these data for air filtration is also discussed.