High-Rate Microfiltration by Use of Ceramic Filter with Rotating Cylinder

• Published in: KAGAKU KOGAKU RONBUNSHU Vol. 15; no. 3; pp. 630 - 637
• Main Authors: Murase, Toshiro, Iritani, Eiji, Chidphong, P., Kano, Katsuhiro, Atsumi, Kunio, Shirato, Mompei
• Format: Journal Article
• Language: Japanese
• Published: The Society of Chemical Engineers, Japan 10.05.1989
• Subjects: Ceramic Membrane; Dynamic Filtration; Filtration; Microfiltration; Rotating Cylinder; Solid Liquid Separation; Thin Cake Filtration
• ISSN: 0386-216X; 1349-9203
• DOI: 10.1252/kakoronbunshu.15.630

To attain high flow-rate microseparation of dilute suspension which contains very fine particles, thin-cake filtration is studied using a dynamic filter with a rotating cylinder of a ceramic membrane. A much higher filtration rate can be obtained by dynamic filtration than that encountered in static-cake filtration because the filter cake is continuously swept from the ceramic membrane by the high-speed rotation of the rotor. The dynamic filtration equation is derived by *introducing a rotatory filtration rate factor jr, defined as the ratio of static-cake resistance to thin-cake resistance, into conventional Ruth filtration equation. On the basis of the fact that the jr-value depends upon the rotor Reynolds number and the ratio of annular gap width to inner-cylinder radius provided other operational veriables are constant, a method is developed for evaluating the variations with time of filtrate volume using the filtration characteristics of the conventional cake filtration. It is also demonstrated that the dynamic effects become marked with increasing slurry concentration and decreasing applied filtration pressure, and that almost the same final equilibrium filtration rate can be obtained irrespective of the average pore size of the ceramic membrane.