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Concentration-driven models revisited : Towards a unified framework to model settling tanks in water resource recovery facilities

Torfs, Elena; Martí, M. Carmen; Locatelli, Florent; Balemans, Sophie; Bürger, Raimund; Diehl, Stefan LU ; Laurent, Julien; Vanrolleghem, Peter A; François, Pierre and Nopens, Ingmar (2017) In Water Science and Technology 75(3). p.539-551
Abstract

A new perspective on the modelling of settling behaviour in water resource recovery facilities is introduced. The ultimate goal is to describe in a unified way the processes taking place both in primary settling tanks (PSTs) and secondary settling tanks (SSTs) for a more detailed operation and control. First, experimental evidence is provided, pointing out distributed particle properties (such as size, shape, density, porosity, and flocculation state) as an important common source of distributed settling behaviour in different settling unit processes and throughout different settling regimes (discrete, hindered and compression settling). Subsequently, a unified model framework that considers several particle classes is proposed in order... (More)

A new perspective on the modelling of settling behaviour in water resource recovery facilities is introduced. The ultimate goal is to describe in a unified way the processes taking place both in primary settling tanks (PSTs) and secondary settling tanks (SSTs) for a more detailed operation and control. First, experimental evidence is provided, pointing out distributed particle properties (such as size, shape, density, porosity, and flocculation state) as an important common source of distributed settling behaviour in different settling unit processes and throughout different settling regimes (discrete, hindered and compression settling). Subsequently, a unified model framework that considers several particle classes is proposed in order to describe distributions in settling behaviour as well as the effect of variations in particle properties on the settling process. The result is a set of partial differential equations (PDEs) that are valid from dilute concentrations, where they correspond to discrete settling, to concentrated suspensions, where they correspond to compression settling. Consequently, these PDEs model both PSTs and SSTs.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Compression, Discrete settling, Primary clarifier, Secondary clarifier, Settling velocity distribution
in
Water Science and Technology
volume
75
issue
3
pages
13 pages
publisher
IWA Publishing
external identifiers
  • scopus:85017274831
  • wos:000394350100006
ISSN
0273-1223
DOI
10.2166/wst.2016.485
language
English
LU publication?
yes
id
24f57a22-48a4-4f50-9afc-dc4ef70b183a
date added to LUP
2017-05-04 09:14:31
date last changed
2017-09-18 13:34:01
@article{24f57a22-48a4-4f50-9afc-dc4ef70b183a,
  abstract     = {<p>A new perspective on the modelling of settling behaviour in water resource recovery facilities is introduced. The ultimate goal is to describe in a unified way the processes taking place both in primary settling tanks (PSTs) and secondary settling tanks (SSTs) for a more detailed operation and control. First, experimental evidence is provided, pointing out distributed particle properties (such as size, shape, density, porosity, and flocculation state) as an important common source of distributed settling behaviour in different settling unit processes and throughout different settling regimes (discrete, hindered and compression settling). Subsequently, a unified model framework that considers several particle classes is proposed in order to describe distributions in settling behaviour as well as the effect of variations in particle properties on the settling process. The result is a set of partial differential equations (PDEs) that are valid from dilute concentrations, where they correspond to discrete settling, to concentrated suspensions, where they correspond to compression settling. Consequently, these PDEs model both PSTs and SSTs.</p>},
  author       = {Torfs, Elena and Martí, M. Carmen and Locatelli, Florent and Balemans, Sophie and Bürger, Raimund and Diehl, Stefan and Laurent, Julien and Vanrolleghem, Peter A and François, Pierre and Nopens, Ingmar},
  issn         = {0273-1223},
  keyword      = {Compression,Discrete settling,Primary clarifier,Secondary clarifier,Settling velocity distribution},
  language     = {eng},
  month        = {02},
  number       = {3},
  pages        = {539--551},
  publisher    = {IWA Publishing},
  series       = {Water Science and Technology},
  title        = {Concentration-driven models revisited : Towards a unified framework to model settling tanks in water resource recovery facilities},
  url          = {http://dx.doi.org/10.2166/wst.2016.485},
  volume       = {75},
  year         = {2017},
}