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Improving Efficiency of DewateringAlternatives to Conventional Dewatering
Technologies
Robert Gillette, PE, BCEESteve Swanback, PE
Rebecca Overacre, PE
2009 PNCWA Webinar Recent Developments In
Biosolids Management Processes
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Outline
1. Screw press technologya. Performance survey resultsb. Pilot testing resultsc. Lifecycle cost evaluation (Class A and Class B)d. Design considerations
2. Rotary fan press technologya. Performance survey resultsb. Pilot testing resultsc. Lifecycle cost evaluation (Class A and Class B)d. Design considerations
3. Overview of R&D Technologies
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Screw Press Technology
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Screw Press Manufacturers
Huber (inclined)
FKC (horizontal)
Screw Press General Description
Dewatering by Volume Reduction
Screw Press Expanded View
Screw Press Expanded ViewClass A Option
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Flow Schematic
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Tallahassee, FL, FKC InstallationTallahassee, FL, FKC Installation
FKC Screw Press
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FKC Screw Press
Petaluma, CA, FKC InstallationPetaluma, CA, FKC Installation
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Huber Press
Magna, UT, Huber InstallationMagna, UT, Huber Installation
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Huber Press
Maine, Huber InstallationMaine, Huber Installation
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Performance Survey
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Survey of 22 Full Scale Installations The Cake Solids Concentration Depends on Type of Sludge
Type of Sludge Screw Press Cake (% solids)FKC 15 20
FKC (with steam and lime) 20 45Huber 12 20FKC 21 28
WAS
Huber 22 25Raw Huber 18 40
PS+WASFKC > 18
Huber 19 24Aerobically Digested
Anaerobically Digested
FKC 17 25Anaerobically Digested Huber 13 16
Raw
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Survey of 22 Full Scale Installations The Median Cleaning Schedule is Once Per Week
Manual Cleaning Schedule(times per month)
0
5
10
15
20
25
30
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22Facility Number
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Case Study St Petersburg, FL
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Pilot Results - Projected Full Performance St. Petersburg
Manufacturers Recommendations
Screw PressBelt Press CentrifugeClass B Class A
Minimum Cake Solids Concentration (% solids)
18 21 16 33
Maximum Polymer Dosage (lb/DT)
19 25 30 33
Minimum Solids Capture (%)
95 95 90 90
Parameter
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Relative Cost Comparison
BFP Centrifuge Screw Press
Capital Cost $ $$$ $$
Building Modifications $ $$ $$
Odor Control $$$ $ $
Power $ $$$ $
Maintenance $$ $$ $
Chemical $$ $$$ $$
Hauling $$ $ $$
Disposal $$ $ $$
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Performance Comparison
Will Vary Depending on Conditions!!!Will Vary Depending on Conditions!!!
BFP Centrifuge Screw Press
% Solids Produced ++ +++ +
Filtrate/Centrate Quality ++ ++ +
Reliability ++ ++ +++
Operator Attention Required + ++ +++
Ease of startup and shutdown ++ + ++
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Design Considerations
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Design Considerations
Lead time (from Japan or Germany): prepurchase?
Custom design varying dimensions until shop drawing
Performance guarantee and penalty for non-compliance
Basis of design Loading & capacity: pilot test Run time, unattended operation
Effect of rising steel costs units all SST
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Design Considerations, Continued
Need headroom if RST on mezzanine Monorail/overhead crane Building considerations footprint
requirement or outside Provision for Class A in future Cake conveyance options affects layout
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Design Parameters
Range of Capacity: Up to 8.5 DT/day At nominal speed
RST output (% Solids): around 4% Screw Press output (% Solids): 15 28% Polymer consumption: 20 40 lb/DT Detention time: approximately 4 hours Motor speed: as low as 0.3 rpm Motor HP largest unit is 7.5 HP
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Rotary Press Technology
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Rotary Press Manufacturers
Fournier
Prime Solutions
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Rotary Press Schematic
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Process Cutaway
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Design Parameters
Range of Capacity: 7-250 gpm Cake % Solids: 12 28% Detention time: N/A Motor speed: as low as 1-3 rpm Motor HP: 5-20 HP
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Fournier Rotary Press
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Size Compared to Other Technologies
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Multiple Channels on Single Drive
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Fournier Rotary Press Pilot Test
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Prime Solutions Rotary Fan Press
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Performance Survey
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Survey Results
Facility EquipmentFacility
Size (mgd)
Solids Type Incoming % TS
Discharge % TS
Raiford, FL Prison WWTP
Rotary fan press 1.1 Extended aeration
1.6-2.5 19-22
Front Royal, VAMunicipal WWTP
Rotary fan press 3.3 Thermophilic Anaerobic Digestion
3.5 25
Fairfield, CAMunicipal WWTP
Rotary fan press 15.5 Conventional Anaerobic Digestion
2 17
Lafayette, TNMunicipal WWTP
Rotary press 0.5 Conventional Anaerobic Digestion
1.0-1.5 25
Portland, MEMunicipal WWTP
Rotary press 19.8 Thickened PS/WAS
3-6 19-25
Hampton, NHMunicipal WWTP
Rotary press 2.5 Septage/PS/WAS
6-8 26-28
Murfreesboro, TNMunicipal WWTP
Rotary press 15 PS/WAS 0.8-1 12-14
Scarborough, MEMunicipal WWTP
Rotary press 1.4 Thickened PS/WAS
3 28
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Rotary Dewatering Features
Low speed, low vibration, low shear Uses less energy than centrifuges or BFPs Modular Small footprint Minimal start-up and shutdown time Minimal moving parts Odors contained
Questions?
916-565-4888
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R&D Technologies
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EKG Technologies
Electrokinetic Geosynthetics (EKG) Technology Theory Electro-osmotic principle
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Uses of EKG Technology
Ashbrook Product Anaerobically/Aerobically Digested
Sludge Fresno England
Alternative to conventional dewatering
Siemens Product Secondary dewatering process Alternative to sludge drying
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Siemens ELODE Technology
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Siemens ELODE Technology
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Siemens ELODE Technology
Questions?
916-565-4888
Improving Efficiency of DewateringAlternatives to Conventional Dewatering TechnologiesOutlineScrew Press ManufacturersScrew Press General DescriptionDewatering by Volume ReductionScrew Press Expanded View Screw Press Expanded ViewClass A OptionFlow SchematicFKC Screw PressFKC Screw PressHuber PressHuber PressSurvey of 22 Full Scale Installations The Cake Solids Concentration Depends on Type of SludgeSurvey of 22 Full Scale Installations The Median Cleaning Schedule is Once Per WeekPilot Results - Projected Full Performance St. PetersburgRelative Cost ComparisonPerformance ComparisonDesign ConsiderationsDesign Considerations, ContinuedDesign ParametersRotary Press ManufacturersRotary Press SchematicProcess CutawayDesign ParametersFournier Rotary PressMultiple Channels on Single DriveFournier Rotary Press Pilot TestPrime Solutions Rotary Fan PressSurvey ResultsRotary Dewatering FeaturesQuestions?Bob [email protected] TechnologiesUses of EKG TechnologySiemens ELODE TechnologySiemens ELODE TechnologySiemens ELODE TechnologyQuestions?Bob [email protected]