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This page provides details of sedimentation processes: the basic types being: free settling and clarification, incompressible hindered settling (as described mathematically by Kynch) and compressible sedimentation or consolidation. We have already implemented pages for interactively calculating free settling velocity, and here we extend this to provide routines for equipment specification. Details of techniques to enhance sedimentation by flocculation and coagulation will also be covered. Currently, the best example of the different types of sedimentation equipment, and how they might be used, can be found at Josh's web site: Solid Liquid Josh provides a very useful set of notes and pictures, but doesn't provide the interactive facilities given here.
Please do take a look at Josh's site but use this site for your interactive equipment selection and process calculations.
Available simulations:
Continuous sedimentation - thickening
an illustrative design procedure that takes inputs on thickener feed rate, etc. and provides the required area in order to achieve the desired underflow concentration. The procedure is based on the classic approach of Coe and Clevenger in which the area is calculated for each concentration that exists in the thickener between the feed and the underflow value. The actual area built should be equal to, or greater, than the largest required area in the table.
Also, included in the output table are values of predicted settling velocity and batch flux.
Settling velocity is predicted by equating the bed weight to liquid drag, as given by the Kozeny permeability expression. These are hindered settling velocities that are, therefore, much slower than the free settling velocities given here.

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