Compression Mechanism in Multilayered Filter Cakes

Abstract

Sedimentation combined with a broad particle size distribution in the suspension results in multilayered filter cakes, where a fine particle layer forms on top of a compressible bottom layer. Owing to their high resistance, the fine particles act as a stiff layer and compress the bottom layer during filtration. This was investigated using a model cake composed of a compressible bottom layer and an artificial fine layer. Compression was determined via a volumetric porosity measurement. A reduction in porosity due to compression increased the filter cake resistance significantly. The use of different types of fine particles demonstrated that if the top layer resistance is higher than that of the bottom, a differential pressure results that pulls the top layer down and compresses the bottom layer.

Kinetic and technological regularities of the filtration process of suspensions using excipients in the production of baker’s yeast

“…The experimental studies of the filtration process on an industrial continuous vacuum filter and the analysis of the obtained patterns, as well as the literature [1,4,[6][7][8][9], made it possible to formulate a number of recommendations aimed at effective management of the process.…”

“…Introduction Filtration of suspensions baker's yeast using excipients refers to complex technological processes and depends on a large number of factors [1][2][3][4][5][6]. At present the theory of the filtration process of yeast suspensions using excipients shas not been practically developed.…”

“…Therefore, strict compliance with the requirements of the technological regulations is necessary at all stages preceding the filtration process. 4. In order to reduce resistance to the filtration process, the thickness of the starch layer should be minimal.…”