characterization of particles behaviour in combined sewers · 2018. 11. 5. · methodology 9 •dry...
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53rd CENTRAL Canadian Symposium on Water Quality Research ,
February 22, 2018
A.Hafhouf, K.Haboub, P.Lessard, G.Pelletier, P.A. Vanrolleghem
Characterization of particlesbehaviour in combined sewers
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Plan
❑ Context
❑Objectives
❑ Case study
❑ Material and methodology
❑ Results and discussion
❑ Conclusion
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Urban catchment
withcombined
sewer
Industry
Combinedsewersystem
Storage tank
WRRF
Urban catchmentwith separate
sewer
Storm tank
(Peiper, 2015)
Context
Storm sewer
Sanitary sewerCombined
seweroverflow
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Problem statement
Transport of particulate pollutants in the combined sewer : the most important process of water quality dynamics
Complexity of the description of the transport of particulatepollutants
✓Heterogeneity of pollutants in the sewer system
✓Difficulty in observing particles physical propreties: Particles settling velocity distribution
✓Lack of representative data
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Objectives
1. Characterization of the hydraulic behavior of thesystem
2. Characterization of particulate pollutants and theirsedimentation
3. Understanding of the flow/sedimentation/resuspensioninteraction as a function of particles settling velocitydistribution
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Case study
• Quebec city
Interceptor section 1.8 km
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Case study
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Qm=4 l/s
Qm=40 l/s
Qm=350 l/s
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Methodology
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• Dry weather
Particles behaviour in dry weather: sanitary water
• Wet weather During the first flush
Particles behaviour
During the dilution phase
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Methodology
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• Dry weather
✓05am-09am: sample every 10 minutes
✓11am-14pm: sample every 08 minutes
✓06pm-10pm: sample every 10 minutes
TSS , ViCAs ( test for settling velocity in sewerage)
• Wet weather
Once the flow increases in St-Sacrement control room:
✓ Sample of 17L every 20 minutes: ViCAs
✓ Sample of 100 ml every 2 minutes: TSS
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Material
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Cooled autosamplerSigma SD 900: including24 bottles of 1 L
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Material
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Settling column of 2m:ViCAs: Vitesse de Chute en
Assainissement
The settled particles are recovered atthe bottom of the column after 1;3;5; 10; 20; 35; 60 and 120 min.
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Results and discussion
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• Antecedent dry weather: 131h
• Rain:12,2mm
• Maximal intensity: 8,4mm/h© Hafhouf et al., 2018
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Results and discusions
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• Mean TSS=220 mg/l• In dry weather, the fraction of organic matter is
very important (90%)
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Results and discusions
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• TSS increases with increasing flow• VSS is 45% of TSS
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Results and discusions
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0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1.0 10.0 100.0
Masse d
e p
art
icule
savec u
ne
vitesse
de c
hute
infé
rieure
à (
%)
Vitesse de Chute(m/h)
Point 1 TP 11-07-17 11h38-12h51
first flush (813mg/l) dilution (155mg/l)
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Results and discusions
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Conclusion
• During wet weather, TSS increases with flow
• VSS fractions are less important in wet weather
• More inorganic matter , is introduced in the combinedsewer by the stormwater, and settled particles during dryweather are resuspended at the higher flow rate
• At high flow rates, the particles settle faster
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Acknowledgement
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Questions ?
Thank you for attention!
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