Integrated urban wastewater systems:
Prediction of particle settling velocity
distributions
Thibaud Maruéjouls,Paul Lessard and Peter A. Vanrolleghem
7th International Conference Sewer Processes & Networks
Sheffield, UK
August 28-30, 2013
Introduction Particle settling velocity distribution
(ViCAs protocol) Integrated model Results Conclusions
2
Outline
3
Intro ViCAs and Vs Integrated model Results Conclusions
RIVER
Separationtreatment
Transport
Storage BiologicalTreatment
SEWER WWTP
TSS-settling
TSS-settling TSS-settling
TSS-settling
This study
TSS-settling
Particle settling velocity distribution model (PSVDM)
CSO
Integrated system
Develop an integrated model based on sedimentation measurements
Reproduce the particle settling velocity distribution (PSVD) along the system
Intro ViCAs and Vs Integrated model Results Conclusions
Objectives
1.00 10.00 100.000%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Vitesse de chute Vs (m/h)
Mass
e de
par
ticul
es a
vec
une
Vs in
férie
ure
à (%
)
1.6 m
/h
68%
5Chebbo and Gromaire (2009) – Journal of Environmental Engineering
Frac
tion
of p
artic
le m
ass w
ith
a Vs
less
than
(%)
Settling velocity Vs (m/h)
Intro ViCAs and Vs Integrated model Results Conclusions
ViCAs Particle settling velocity distribution
1.00 10.00 100.000%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Vitesse de chute Vs (m/h)
Mass
e de
par
ticul
es a
vec
une
Vs in
férie
ure
à (%
)
6
Frac
tion
of p
artic
le m
ass w
ith
a Vs
less
than
(%)
Settling velocity Vs (m/h)
Intro ViCAs and Vs Integrated model Results Conclusions
ViCAs Particle settling velocity distribution
Class 1
Class 2
Class 3
Class 4
Class 5
Vs1=0.03
1.00 10.00 100.000%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Vitesse de chute Vs (m/h)
Mass
e de
par
ticul
es a
vec
une
Vs in
férie
ure
à (%
)
7
Frac
tion
of p
artic
le m
ass w
ith
a Vs
less
than
(%)
Settling velocity Vs (m/h)
Intro ViCAs and Vs Integrated model Results Conclusions
ViCAs PSVD and concentration
High TSS concentration Fast PSVD
Low TSS concentration Slow PSVD
8
DW
WW
Integrated systemInputs
Fast PSVD
Slow PSVD
Intro ViCAs and Vs Integrated model Results Conclusions
Fast PSVD
Slow PSVD
9
Simulated PSVDcompared with
observed
Simulated PSVDcompared with
observed
Integrated systemOutputs
Intro ViCAs and Vs Integrated model Results Conclusions
10
PCPC
Different hours
Intro ViCAs and Vs Integrated model Results Conclusions
PSVD DW observation
Observed PC outlet
1.6 m/h
Observed PC inlet
11
PSVDSimulation vs. observation
Maruéjouls et al. (2011) – Water Science & Technology
PCPC
Different hours
PCinlet
PC outlet
Intro ViCAs and Vs Integrated model Results Conclusions
Observed PC outlet
Observed PC inlet
1.6 m/h
Conclusions Integrated model with particle classes,
requiring only few ViCAs experiments Reproduces the PSVD evolution between RT
and PC Particle transport through urban system is
improved Many processes are simulated under DW and
WW conditions: sedimentation, RT cleaning systems, pumping induced resuspension
12
Intro ViCAs and Vs Integrated model Results Conclusions
Thanks Questions
Canada Research Chair on Water Quality Modeling
Collaborative Research and Development Grants
