lin improving flow distribution using cfb
TRANSCRIPT
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Improving Flow Distributions
in Treatment PlantsUsing CFD Modeling
Fangbiao Lin, Ph.D., P. Eng.
October 24, 2012
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Outline
IntroductionCFD 101
Flow Distribution in a Grit Chamber System
Flow Distribution in an Influent Channel to Filters
Summery
Flow Distribution between UV reactors
Mixing Zone/Diffusers
Mixing Performance of an Elevated Water Tank
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Introduction
This presentation will demonstrate how CFD modelinghas been used to improve flow distribution in
treatment plants.
Show three project examples: Humber Treatment Plant Seymour-Capilano Treatment Plant UV Disinfection Reactors
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Understand problem and objectives 3D Geometrical model preparation Mesh generation Model setup and solution Results analysis
CFD Modeling 101
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Improve Flow Distribution to Grit Chambers
Uneven flow distributions to six grit chambers result in some
grit chambers over-loaded and some grit chambers under-loaded.
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CFD Modeling of Existing System
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CFD Modeling of Existing System
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CFD Modeling of Existing System
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Improve Flow Distribution to Grit Chambers
Add separation wall and chambers to improve flow distribution
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CFD Modeling of Existing System
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CFD Modeling of Existing System
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CFD Modeling of Existing System
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Improve Flow Distribution in an Influent
Channel
Uneven flow to 12 filters Need to reduce hydraulic loss and increase flow capacity
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Improve Flow Distribution in an Influent
Channel
Add flow training devices to improve flow distribution
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Improve Flow Distribution in an Influent
Channel
Case No.I
Influent Gates (m) Baffle and EffluentGates (m)
FIF (m) Total Losses(m)
Baseline 1 0.289 0.190 0.323 0.802
FieldMeasurement
0.289 0.183 0.263 0.735
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Improve Flow Distribution in an Influent
Channel
Flow Distribution greatly improved Hydraulic loss reduced from 1.46 m to 0.70 m
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Flow Distribution in UV Piping
Predict Flow Distribution and Uniformity in UV piping
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Flow Distribution in UV Piping
Predict Flow Distribution and Uniformity in UV piping
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Mixing Zones/DiffusersTruckee River Mixing Zone Study
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Mixing Performance of a Water Tank
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Mixing Performance of a Water Tank
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Mixing Performance of a Water Tank
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Summary
" CFD modeling is a cost-effective tool for solving flow problemsfor water and wastewater engineering.
" Use of CFD modeling can greatly improve flow distributions intreatment plants and achieve satisfactory hydraulics conditions
for pump stations, grit chambers, influent, effluent channels,
contactors, clarifiers, etc.
Contact me [email protected] for more information.
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Improving Flow Distributions
in Treatment PlantsUsing CFD Modeling
Fangbiao Lin, Ph.D., P. Eng.
October 24, 2012