Analytical Approach for Evaluation of Settling Column Data

Abstract

In this study an equation of iso-percentage curves as a function of settling time and depth is developed which is applicable both to discrete and flocculent suspensions. Using this model, an expression for the solids removal ratio of quiescent settling suspensions is obtained. Results of the proposed expression are found to be in good agreement for most cases when predicted and reported solids removal ratios are compared. Observed differences are interpreted as results of manual interpolation of iso-percentage curves and as assumptions made in graphical evaluations of solids removal efficiencies in the literature. It is concluded that the presented expression can be used as a numerical approach in the evaluation of ideal settling column test results of suspensions.