Design of composite filtration media using flow porometry

摘要

Filtration media are required to have suitable pore size, pore size distribution, pore volume, pore surface area and permeability for performing satisfactorily in applications. It is difficult to encounter all the desired properties in a filtration medium. In this investigation, we have characterized filtration media by flow porometry, used these pre-characterized filtration media to design composite filtration media, and tested these composites by flow porometry. Specimen of the filtration medium to be tested is soaked in a wetting liquid and gas pressure on one side of the specimen is slowly increased to displace the liquid from the pores and increase gas flow. Gas pressure and flow rates through wet and dry samples are measured and analyzed to obtain the largest pore size, the pore size distribution, and permeability. All of these characteristics of filtration media were measured in this investigation. It was shown that composite filtration media possessing unique characteristics could be prepared by a logical selection of pre-characterized filtration media.