Lin Improving Flow Distribution Using Cfb

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Improving Flow Distributions

in Treatment PlantsUsing CFD Modeling

Fangbiao Lin, Ph.D., P. Eng.

[email protected]

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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Improve Flow Distribution to Grit Chambers

Add separation wall and chambers to improve flow distribution


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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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Channel

Add flow training devices to improve flow distribution


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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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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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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.

[email protected]

October 24, 2012

Documents

Lin Improving Flow Distribution Using Cfb