Maximizing Secondary Wet Weather Treatment Capacity at ... - pncwa

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Clarifier Failure Mechanism Failure exacerbated at high SVI because the sludge blanket is less dense At failure, dispersed layer extends throughout clarifier and outlet arrangement carries TSS over weir ` The turbulence creates a dispersed sludge layer above the thick blanket at high flows Influent flow jets into the sludge blanket 36
Clarifier Failure Mechanism Also used CFD to define clarifier capacity Effluent TSS (mg/L) 400 350 300 250 200 150 100 50 Solids flux analysis with CFD results - the clarifiers failed at a point 20% less than the theoretical capacity The design is flexible enough to accommodate higher clarifier capacity 0 10 12 14 16 18 20 22 Clarifier Solids Loading Rate (ppd/sf) 37
Page 1 and 2: Maximizing Secondary Wet Weather Ca
Page 3 and 4: Portland Rainfall Patterns 180 We
Page 5 and 6: Columbia Boulevard WWTP Largest was
Page 7 and 8: Columbia Boulevard WWTP Wet Weather
Page 9 and 10: Challenges to Maximizing Secondary
Page 11 and 12: Challenges to Maximizing Secondary
Page 13 and 14: Project Goals 1. Maximize peak flow
Page 15 and 16: Two Types of Wet Weather Events 1.
Page 17 and 18: Two Wet Weather Operating Modes Ste
Page 19 and 20: Two Wet Weather Operating Modes Ste
Page 21 and 22: Maintain Well Settling Sludge Two t
Page 23 and 24: Provide Tools for Sludge Settleabil
Page 27 and 28: Decision to Shift Operating Mode is
Page 31 and 32: Clarifier Capacity Analysis Based o
Page 33 and 34: Clarifier Capacity Analysis Based o
Page 35: Clarifier Capacity Analysis Based o
Page 39 and 40: Clarifier Improvements Failure mech
Page 41 and 42: Thank You! Questions Contact Infor

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