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We construct global weak solutions to the different modes of sedimentation appearing in the theory of Kynch and show that, with constant initial concentration, only five modes of sedimentation exkt. Wc also generalize the method of construction to the case of a monotonically decreasing initial concentration.

We present the control of continuous sedimentation in an ideal thickener as an initial and boundary value problem and construct the entropy solution. ,

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We present the sedimentation of an ideal suspension in a continuous thickener as an initial value problem and study the transient states by constructing the corresponding global weak solutions. Finally, we obtain a way to control the operation of the thickener.