On constitutive functions for hindered settling velocity in 1-D settler models: Selection of appropriate model structure

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On constitutive functions for hindered settling velocity in 1-D settler models : Selection of appropriate model structure. / Torfs, Elena; Balemans, Sophie; Locatelli, Florent; Diehl, Stefan; Bürger, Raimund; Laurent, Julien; François, Pierre; Nopens, Ingmar.

I: Water Research, Vol. 110, 01.03.2017, s. 38-47.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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Torfs, Elena ; Balemans, Sophie ; Locatelli, Florent ; Diehl, Stefan ; Bürger, Raimund ; Laurent, Julien ; François, Pierre ; Nopens, Ingmar. / On constitutive functions for hindered settling velocity in 1-D settler models : Selection of appropriate model structure. I: Water Research. 2017 ; Vol. 110. s. 38-47.

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TY - JOUR

T1 - On constitutive functions for hindered settling velocity in 1-D settler models

T2 - Water Research

AU - Torfs, Elena

AU - Balemans, Sophie

AU - Locatelli, Florent

AU - Diehl, Stefan

AU - Bürger, Raimund

AU - Laurent, Julien

AU - François, Pierre

AU - Nopens, Ingmar

PY - 2017/3/1

Y1 - 2017/3/1

N2 - Advanced 1-D models for Secondary Settling Tanks (SSTs) explicitly account for several phenomena that influence the settling process (such as hindered settling and compression settling). For each of these phenomena a valid mathematical expression needs to be selected and its parameters calibrated to obtain a model that can be used for operation and control. This is, however, a challenging task as these phenomena may occur simultaneously. Therefore, the presented work evaluates several available expressions for hindered settling based on long-term batch settling data. Specific attention is paid to the behaviour of these hindered settling functions in the compression region in order to evaluate how the modelling of sludge compression is influenced by the choice of a certain hindered settling function. The analysis shows that the exponential hindered settling forms, which are most commonly used in traditional SST models, not only account for hindered settling but partly lump other phenomena (compression) as well. This makes them unsuitable for advanced 1-D models that explicitly include each phenomenon in a modular way. A power-law function is shown to be more appropriate to describe the hindered settling velocity in advanced 1-D SST models.

AB - Advanced 1-D models for Secondary Settling Tanks (SSTs) explicitly account for several phenomena that influence the settling process (such as hindered settling and compression settling). For each of these phenomena a valid mathematical expression needs to be selected and its parameters calibrated to obtain a model that can be used for operation and control. This is, however, a challenging task as these phenomena may occur simultaneously. Therefore, the presented work evaluates several available expressions for hindered settling based on long-term batch settling data. Specific attention is paid to the behaviour of these hindered settling functions in the compression region in order to evaluate how the modelling of sludge compression is influenced by the choice of a certain hindered settling function. The analysis shows that the exponential hindered settling forms, which are most commonly used in traditional SST models, not only account for hindered settling but partly lump other phenomena (compression) as well. This makes them unsuitable for advanced 1-D models that explicitly include each phenomenon in a modular way. A power-law function is shown to be more appropriate to describe the hindered settling velocity in advanced 1-D SST models.

KW - 1-D modelling

KW - Batch settling test

KW - Calibration

KW - Compression settling

KW - Secondary clarifier

UR - http://www.scopus.com/inward/record.url?scp=85004065487&partnerID=8YFLogxK

U2 - 10.1016/j.watres.2016.11.067

DO - 10.1016/j.watres.2016.11.067

M3 - Article

VL - 110

SP - 38

EP - 47

JO - Water Research

JF - Water Research

SN - 1879-2448

ER -