Determination of filtration characteristics due to sudden reduction in filtration area of filter cake surface.

Abstract

To obtain accurate values of filtration characteristics as the ratio mof wet to dry cake massand the average specific filtration resistance aav, constant-pressure filtration experiments were conducted using a filter having a hole at the top of the filter chamber. The relation between the cake thickness L and the filtrate volume v per unit medium area, which serves as a basis of the determination of m and aav, can be obtained on the basis of the principle of sudden reduction in the filtration area of the cake surface. The constant-pressure filtration characteristics obtained by this method were fairly consistent with the estimated values based on compression-permeability cell data. The values of m and aav are influenced by filtration pressure and by slurry concentration. However, these values remain constant during any one constant-pressure filtration experiment. On the basis of the constant-pressure filtration data obtained by this method under various pressure conditions, the local porosity s and the local specific filtration resistance a can be determined approximately.

Developments of Blocking Filtration Model in Membrane Filtration

“…(41) is related to the applied filtration pressure p by (Sperry, 1921;Murase et al, 1987;Iritani et al, 2002;Zhou et al, 2015) 1…”

Analysis of cake filtration data—A critical assessment of conventional filtration theory

“…The insert plate has a raised cylindrical portion surrounding the orifice opening such that when the insert plate is in place, the distributor portion of the upper piston is closed off; thus, restricting the flow of the test suspension through the orifice only. This design was made following the work of Murase et al 28 and detailed features of the test cell are shown in Figure 2. More complete descriptions of the cell can be found elsewhere, 29 -31 and will not be repeated here.…”

“…As stated before, the method used for determining the cake thickness vs. time was based on the method first proposed by Murase et al 28 For each filtration experiment, the upper piston of the test cell was placed at a particular position. The test suspension entered into the cell through the inlet opening of the piston.…”

Properties of Filter Cake in Cake Filtration and Membrane Filtration

“…A method has been developed for evaluating rigorously the properties of the filter cake, such as the average porosity ε av and the average specific filtration resistance α av [8]. It utilizes the sudden reduction in filtration area of the cake surface.…”