Solid aerosol removal using ceramic filters

Symmetric tubular ceramics exhibiting a 50% porous volume and mean pore dia meters centered around 11, 13 and 15.5 mu m, respectively, were tested in a erosol filtration using sodium chloride particles in the range of 0.01-0.7 mu m in diameter and face velocity varying from 0.6 to 4 cm/s. The evolutio n of particle penetration and pressure drop was measured in function of por e size, membrane thickness and air flow velocity. The filtration results gi ven as a function of the filter characteristics and of the operating condit ions show that these filters can be classified as high efficiency particula te air filters whether as HEPA or ULPA standards. (C) 2000 Elsevier Science B.V. All rights reserved.