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

sgs809pncwa.ppt/2

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

sgs809pncwa.ppt/3

Screw Press Technology

sgs809pncwa.ppt/4

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

sgs809pncwa.ppt/9

Flow Schematic

sgs809pncwa.ppt/10

Tallahassee, FL, FKC InstallationTallahassee, FL, FKC Installation

FKC Screw Press

sgs809pncwa.ppt/11

FKC Screw Press

Petaluma, CA, FKC InstallationPetaluma, CA, FKC Installation

sgs809pncwa.ppt/12

Huber Press

Magna, UT, Huber InstallationMagna, UT, Huber Installation

sgs809pncwa.ppt/13

Huber Press

Maine, Huber InstallationMaine, Huber Installation

sgs809pncwa.ppt/14

Performance Survey

sgs809pncwa.ppt/15

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

sgs809pncwa.ppt/16

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

sgs809pncwa.ppt/17

Case Study St Petersburg, FL

sgs809pncwa.ppt/18

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

sgs809pncwa.ppt/19

Relative Cost Comparison

BFP Centrifuge Screw Press

Capital Cost $ $$$ $$

Building Modifications $ $$ $$

Odor Control $$$ $ $

Power $ $$$ $

Maintenance $$ $$ $

Chemical $$ $$$ $$

Hauling $$ $ $$

Disposal $$ $ $$

sgs809pncwa.ppt/20

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 ++ + ++

sgs809pncwa.ppt/21

Design Considerations

sgs809pncwa.ppt/22

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

sgs809pncwa.ppt/23

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

sgs809pncwa.ppt/24

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

sgs809pncwa.ppt/25

Rotary Press Technology

sgs809pncwa.ppt/26

Rotary Press Manufacturers

Fournier

Prime Solutions

sgs809pncwa.ppt/27

Rotary Press Schematic

sgs809pncwa.ppt/28

Process Cutaway

sgs809pncwa.ppt/29

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

sgs809pncwa.ppt/30

Fournier Rotary Press

sgs809pncwa.ppt/31

Size Compared to Other Technologies

sgs809pncwa.ppt/32

Multiple Channels on Single Drive

sgs809pncwa.ppt/33

Fournier Rotary Press Pilot Test

sgs809pncwa.ppt/34

Prime Solutions Rotary Fan Press

sgs809pncwa.ppt/35

Performance Survey

sgs809pncwa.ppt/36

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

sgs809pncwa.ppt/37

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?

Bob Gillettergillette@carollo.com

916-565-4888

sgs809pncwa.ppt/39

R&D Technologies

sgs809pncwa.ppt/40

EKG Technologies

Electrokinetic Geosynthetics (EKG) Technology Theory Electro-osmotic principle

sgs809pncwa.ppt/41

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

sgs809pncwa.ppt/42

Siemens ELODE Technology

sgs809pncwa.ppt/43

Siemens ELODE Technology

sgs809pncwa.ppt/44

Siemens ELODE Technology

Questions?

Bob Gillettergillette@carollo.com

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 Gillettergillette@carollo.com916-565-4888EKG TechnologiesUses of EKG TechnologySiemens ELODE TechnologySiemens ELODE TechnologySiemens ELODE TechnologyQuestions?Bob Gillettergillette@carollo.com916-565-4888