A Contribution To The Problem Of
The Continuous Dewatering Process
Author(s)
J. Mls
Abstract
Because of its energetic efficiency, gravity thickening is one of the most convenient
processes of lowering the volume of suspensions. One of the problems that
has to be solved when designing equipment for, say, a digestion tank for the continuous
process of suspension dewatering, is to determine the optimum height of
the compression zone of the given suspension. This paper presents a solution for
this problem. The suspension is considered as a two-phase continuum where both
the phases are independently movable. The behaviour of such a system can be
described by a set of partial differential equations of general Darcian mechanics.
Making use of the known hydromechanical characteristics of the investigated
two-phase system, a problem with a set of two ordinary differential equations and
related boundary conditionswas formulated and numerically solved. The unknown
functions of the problem are the liquid-phase pressure and the solid-phase concentration.
The method of solution is described and the achieved results are visualized
and presented.
1 Introduction
The process of compression of a suspension has to be studied in detail when various
industrial technologies are designed, particularly when the optimum height
of the compression zone of sedimentation tanks has to be determined, e.g. Tuˇcek
and Kon´ıˇcek [6]. The previous reduction of the suspension volume minimizes, for
example, the space of digestion tanks and improves the efficiency of filtration or
centrifugation. The gravity thickening is, because of its low energetic demands,
one of the most convenient processes of lowering volume of suspensions and significantly
increasing the concentration of their solid phase.
Keywords
Related Book
Other papers in this volume
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