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2013 PNWS-AWWA Conference May 9, 2013
Using Computational Fluid Dynamics (CFD) to Understand & Improve Water Treatment
CH2M HILL Paul Berg Adam Nielsen EWEB Wally McCullough Ray Leipold
Dynamics (CFD) to Understand & Improve Water Treatment 2013 - - PowerPoint PPT Presentation
Dynamics (CFD) to Understand & Improve Water Treatment 2013 - - PowerPoint PPT Presentation
Using Computational Fluid Dynamics (CFD) to Understand & Improve Water Treatment 2013 PNWS-AWWA Conference May 9, 2013 CH2M HILL EWEB Paul Berg Wally McCullough Adam Nielsen Ray Leipold EWEB Hayden Bridge Filtration Plant Filters
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Flow Path
Raw water inlets Inlet distribution channel Baffle walls Settling Basins Intermediate collection channel Filters Outlet distribution channel
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Observed short circuiting
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North Settling Basin Intermediate collection channel Filters Inlet distribution channel Baffle walls
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STARTING POINT—
MODEL EXISTING PLANT
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Low High
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2 feet below the surface
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1 hour
Tracer results
Old New
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2 hours
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4 hours
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6 hours
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Findings
- 1. Uneven distribution into the 3 basins
- 2. Short-circuiting within basins
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No. 1 23% 33% 45% 2 59% 10% 31% 3 40% 20% 39% 4 55% 15% 30% 5 60% 19% 21% South Center
Existing Plant Modeling Results
North
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What’s the answer?
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#1 – Close N. Basin side outlet
12 feet below the surface Option #1 Original
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#2 – Close baffle openings
Original 12 feet below the surface Option #2
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#3 – Reduce channel inlet size
Original 12 feet below the surface Option #3
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#3 – Reduce channel inlet size
2 feet below the surface
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Lessons
What you see on the surface doesn’t tell
the whole story
Right angles are not part of water
vocabulary
You don’t solve hydraulic problems by
guessing
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You can’t cheat the headloss troll
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