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Modeling and controlling clarifier–thickeners fed by suspensions with time-dependent properties

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Author

  • Fernando Betancourt
  • Raimund Bürger
  • Stefan Diehl
  • Sebastian Farås

Summary, in English

A one-dimensional model of the process of continuous sedimentation in a clarifier–thickener unit is presented. The governing model is expressed as a system of two nonlinear partial differential equations for the solids volume fraction and the varying settling velocity of the solids as functions of depth and time. This model extends the well-known model for the dynamics of a flocculated suspension in a clarifier–thickener advanced by Bürger et al. (2005). Operating charts are calculated to be used for the control of steady states, in particular, to keep the sediment level and the underflow volume fraction at desired values. A numerical scheme and a simple regulator are proposed and numerical simulations are performed.

Department/s

Publishing year

2014

Language

English

Pages

91-101

Publication/Series

Minerals Engineering

Volume

62

Document type

Journal article

Publisher

Pergamon Press Ltd.

Topic

  • Water Treatment
  • Water Engineering
  • Control Engineering
  • Chemical Engineering
  • Mineral and Mine Engineering
  • Mathematics
  • Computational Mathematics

Status

Published

Research group

  • Partial differential equations
  • Numerical Analysis

ISBN/ISSN/Other

  • ISSN: 0892-6875