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1
2017 MWEA
ANNUAL
CONFERENCE
Sludge Thickening/Storage
Alternatives Analysis for a 225 MGD
Wastewater Treatment Facility
7/10/2017 HUBBELL, ROTH & CLARK, INC. | MWEA 2017 ANNUAL CONFERENCE
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PRESENTATION AGENDA:
≡Introduction
≡Background
≡Key Issues / Initial Scope
≡Alternatives
≡To and Fro
≡Final System
≡Lessons Learned
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INTRODUCTION / BACKGROUND
≡Downriver WTF (DWTF)
≡Expansions, renovations in 1929, 1938, 1962, 1969, 1975, 1986, 1995, 1999, 2000, 2002, 2007, 2011, 2011, 2011, 2016, 2018
≡Wyandotte
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≡Serves 13 Communities
≡Allen Park, Belleville,
Brownstown Twps., Dearborn
Heights, Ecorse, Lincoln Park,
River Rouge, Riverview,
Romulus, Southgate, Taylor, Van
Buren Twps.., Wyandotte
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LOCATION
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DWTF
≡40 MGD ADF
≡225 MGD Peak Flow (250+ MGD)
≡Chemical Phosphorus Removal (Ferric)
≡High Purity Oxygen Activated Sludge
≡Unique Blending Process:
≡225 MGD Headworks and Disinfection
≡150 MGD Primary
≡125 MGD Secondary
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67/10/2017 MWEA 2017 ANNUAL CONFERENCE
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SOLID PROCESS PRIMARY SLUDGE
≡7 Primaries (1962, 1969, 1999)
≡Each Tank Has Dedicated Chopper Pump
≡Timer Control Based on Sludge Blanket Levels
≡Pump to 150,000 Gallon (ea.) Primary Sludge Storage
Tanks (then to Incineration 1962)
≡Pump to 4 Gravity Thickeners w/ Two Chopper Type
Pumps (1975)
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WAS SLUDGE
≡6 Secondary’s (1972, 1986),
≡ Each with RAS Pump
≡Consistent WAS Pumping Based On MCRT, MLSS
≡Pump Directly to Gravity Thickeners
≡Co-Thicken But Maintain Separate Feed
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137/10/2017 MWEA 2017 ANNUAL CONFERENCE
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SOLID COMPLEX
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• Thicken,
• Dewater,
• Convey to Roll-offs,
• Truck to Landfills
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SOLID COMPLEX EQUIPMENT
≡4 Gravity Thickeners, with 6 Plunger Pumps (1975)
≡2 Sludge Storage / Blend Tanks, with 3 Rotary Lobe
Pumps and Chopper Pumps
≡2 4,000 lbs./day Centrifuges, Individual Feed (2008)
≡4 BFPs with Loops Feed (1995)
≡Screw Conveyor (2008) Cake to Truck, Landfill
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SIMPLIFIED BOX DIAGRAM
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KEY ISSUES / INITIAL SCOPE
≡Antiquated, Total Facility
Upgrade
≡Update to State of the Art
≡Simplify but Maintain
Needed Redundancy
≡Get rid of extra pumps,
storage tanks
≡Pump Sludge to Splitter Box,
Gravity Feed to Gravity
Thickeners
≡Pump to Storage / Blend
Tank
≡Attempt to Remove Grit
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INITIAL PROCESS FLOW SCHEMATIC
≡Pump Primary Sludge Directly to Thickeners
≡Splitter Box Gravity Feed
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SIMPLIFIED BOX DIAGRAM
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SIMPLIFIED BOX DIAGRAM
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THICKENING PROCESS FLOW
SCHEMATIC – SIMPLIFY!
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SPLITTER BOX CONCEPT
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EVALUATIONS / WORKSHOPS
≡Considered Batch vs. Continuous Processing
≡Evaluated Splitter Box vs. Flow Meter – Control Valves Sets
≡12 Meter – Control Valve Sets
≡Four, Five and Six Sided Splitter Box
≡Fixed vs. Controlled Gates
≡Mechanical vs. Turbulence Mixing
≡Means of Grit Removal
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EVALUATIONS / WORKSHOPS CONT.
≡Evaluated Sludge Pumps
≡7 Possibly Types
≡Site Visit PVP and Other Due Diligence
≡Evaluated Blend Tank Mixers
≡6 Possibly Types
≡Linear Motion Due Diligence
≡Grit Removal
≡Consider Repurpose Skimmings Building
≡Explore Equipment at WEFTEC
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INITIAL PROCESS SELECTIONS
≡Mag Meter – Control Valve Sets (12) to New Gravity
Thickeners
≡Pump to Blend Tanks
≡Mix to provide consistent feed
≡Linear Motion Mixers
≡Dedicated PVPs to Centrifuges, Rotary Lobes to BFPs
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But…
Why Are We “Thickening?”
…and...
Why Are We Pumping Again?
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≡Centrifuge Loading:
≡2% - 4% Feed Concentration
≡4,000 lbs. /hr.
≡New and Shiny
≡BFP:
≡4% - 10% Feed Concentration
≡One-third the Centrifuge Production
≡Old and saggy
Ultimately Going With Additional Centrifuges
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Competing Dewatering Interests
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≡Convert Thickeners to Storage Tanks
≡Eliminate Blend Tanks
≡Mix to provide consistency
≡Pump Directly to Dewatering Units
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EVALUATION / SOLUTIONS:
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SIMPLIFIED BOX DIAGRAM
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≡Eliminate Primary Sludge Storage Tanks and Sludge Pumps
≡Convert Gravity Thickeners to Sludge Storage
≡Pump Primary and WAS Directly to Sludge Storage Tanks
≡Eliminate Sludge Storage / Blend Tanks
≡Continue Flow Control Valve Meter Sets
≡(Eliminate elutriation water control sets)
≡Mix with Linear Motion Mixers
≡Relocate Ex Rotary Lobe to Feed BFP (problematic)
≡New PVP to Feed Centrifuges
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ULTIMATE SOLUTION
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≡Rotary Lobe – Lobes Swelled, Rubbed Casing (Left Doors Open)
≡Vendor - “They shouldn’t swell”
≡Switched Out Lobes with Little Results
≡Vendor Witnessed Maintenance Procedures
≡Wrong Procedures
≡Staff Retrained
≡No More “Swollen Lobes”
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LESSONS LEARNED (CONT.)
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≡ Centrifuge Internals Headloss
≡6” lines, to 4’ dia. Centrifuge Feed Pipe
≡Internally, Pipe Necks Down to 2” dia.
≡Discovered When Pumps Were Dismantled For Repairs
(Oh-Shmit Moment)
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LESSONS LEARNED (CONT.)
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LESSONS LEARNED (CONT.)
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≡Oh-Biosolids Moment
≡(Discovered When Pumps Were Dismantled For Repairs)
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≡ Centrifuge Internal Headloss
≡6” lines, to 4’ dia. Centrifuge Feed Pipe
≡4” = 10 fps
≡Internally, Pipe Necks Down to 2” dia.
≡2 “ dia = 40 fps
≡Additional 25 ft. headloss (clean water)
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≡Dual Disk Pump - ‘Enamored’ with PVPs (Nice Shiny
Technology)
≡Due Diligence Calls / Site Visit
≡Lease-to-Purchase for 6 Months
≡Worked Flawless at 120 gpm, Low Head
≡Once applied, severe vibrations, disk ruptures, inability
to meet design conditions (400 gpm), loss of air in
pulsation dampener chambers,
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LESSONS LEARNED
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WRAP-UP:
$10M Construction
Sorenson Gross (Prime)
J.F. Cavanaugh
Shaw Electric
Commerce Controls Inc.
Final Completion May 2016
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49
Q&A???
THANK YOU!
Tim Sullivan, P.E.
If you have questions about the presentation, please contact me:
7/10/2017 HUBBELL, ROTH & CLARK, INC. | MWEA 2017 ANNUAL CONFERENCE