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Simulation and control of dissolved air flotation and column froth flotation with simultaneous sedimentation

Bürger, Raimund ; Diehl, Stefan LU ; Martí, María Carmen and Vásquez, Yolanda (2020) In Water science and technology : a journal of the International Association on Water Pollution Research 81(8). p.1723-1732
Abstract

Flotation is a separation process where particles or droplets are removed from a suspension with the aid of floating gas bubbles. Applications include dissolved air flotation (DAF) in industrial wastewater treatment and column froth flotation (CFF) in wastewater treatment and mineral processing. One-dimensional models of flotation have been limited to steady-state situations for half a century by means of the drift-flux theory. A newly developed dynamic one-dimensional model formulated in terms of partial differential equations can be used to predict the process of simultaneous flotation of bubbles and sedimentation of particles that are not attached to bubbles. The governing model is a pair of first-order conservation laws for the... (More)

Flotation is a separation process where particles or droplets are removed from a suspension with the aid of floating gas bubbles. Applications include dissolved air flotation (DAF) in industrial wastewater treatment and column froth flotation (CFF) in wastewater treatment and mineral processing. One-dimensional models of flotation have been limited to steady-state situations for half a century by means of the drift-flux theory. A newly developed dynamic one-dimensional model formulated in terms of partial differential equations can be used to predict the process of simultaneous flotation of bubbles and sedimentation of particles that are not attached to bubbles. The governing model is a pair of first-order conservation laws for the aggregate and solids volume fractions as functions of height and time. An analysis of nonlinear ingredients of the governing equations helps to identify desired steady-state operating conditions. These can be chosen by means of operating charts, which are diagrams that visualize regions of admissible values of the volumetric flows of the feed input and underflow outlet. This is detailed for the DAF thickening process. Dynamic simulations are obtained with a recently developed numerical method. Responses to control actions are demonstrated with scenarios in CFF and DAF.

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publishing date
type
Contribution to journal
publication status
published
subject
in
Water science and technology : a journal of the International Association on Water Pollution Research
volume
81
issue
8
pages
10 pages
publisher
IWA Publishing
external identifiers
  • pmid:32644964
  • scopus:85087817203
ISSN
0273-1223
DOI
10.2166/wst.2020.258
language
English
LU publication?
yes
id
94b901f1-1642-4e74-811e-cfe4ca2fd035
date added to LUP
2020-07-22 12:45:41
date last changed
2020-10-20 03:44:22
@article{94b901f1-1642-4e74-811e-cfe4ca2fd035,
  abstract     = {<p>Flotation is a separation process where particles or droplets are removed from a suspension with the aid of floating gas bubbles. Applications include dissolved air flotation (DAF) in industrial wastewater treatment and column froth flotation (CFF) in wastewater treatment and mineral processing. One-dimensional models of flotation have been limited to steady-state situations for half a century by means of the drift-flux theory. A newly developed dynamic one-dimensional model formulated in terms of partial differential equations can be used to predict the process of simultaneous flotation of bubbles and sedimentation of particles that are not attached to bubbles. The governing model is a pair of first-order conservation laws for the aggregate and solids volume fractions as functions of height and time. An analysis of nonlinear ingredients of the governing equations helps to identify desired steady-state operating conditions. These can be chosen by means of operating charts, which are diagrams that visualize regions of admissible values of the volumetric flows of the feed input and underflow outlet. This is detailed for the DAF thickening process. Dynamic simulations are obtained with a recently developed numerical method. Responses to control actions are demonstrated with scenarios in CFF and DAF.</p>},
  author       = {Bürger, Raimund and Diehl, Stefan and Martí, María Carmen and Vásquez, Yolanda},
  issn         = {0273-1223},
  language     = {eng},
  number       = {8},
  pages        = {1723--1732},
  publisher    = {IWA Publishing},
  series       = {Water science and technology : a journal of the International Association on Water Pollution Research},
  title        = {Simulation and control of dissolved air flotation and column froth flotation with simultaneous sedimentation},
  url          = {http://dx.doi.org/10.2166/wst.2020.258},
  doi          = {10.2166/wst.2020.258},
  volume       = {81},
  year         = {2020},
}