Abstract
The capillary suction time (CST) method for measuring the filterability of a suspension is described, and its mode of operation is reviewed and discussed. A radial capillary suction time apparatus, and the filter paper used by it, are investigated in various ways to obtain the capillary suction pressure P, the water porosity ϵ of the filter paper, and the water saturation s w ( r) in the filter paper as a function of the radial distance r from the suspension to be filtered. Air is shown to coexist with water in the wetted filter paper, but P and the effective water porosity are shown to be practically constant in the paper as used in the CST method. Measurements are made of the desorptivity S of a bentonite suspension using a conventional constant-pressure filter press, and compared with S obtained from CST measurements.
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