Improving Efficiency of Dewatering Alternatives to Conventional Dewatering Technologies
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1 Improving Efficiency of Dewatering Alternatives to Conventional Dewatering Technologies Robert Gillette, PE, BCEE Steve Swanback, PE Rebecca Overacre, PE 2009 PNCWA Webinar Recent Developments In Biosolids Management Processes
2 Outline 1. Screw press technology a. Performance survey results b. Pilot testing results c. Lifecycle cost evaluation (Class A and Class B) d. Design considerations 2. Rotary fan press technology a. Performance survey results b. Pilot testing results c. Lifecycle cost evaluation (Class A and Class B) d. Design considerations 3. Overview of R&D Technologies sgs809pncwa.ppt/2
3 sgs809pncwa.ppt/3 Screw Press Technology
4 Screw Press Manufacturers FKC (horizontal) Huber (inclined) sgs809pncwa.ppt/4
5 Screw Press General Description
6 Dewatering by Volume Reduction
7 Screw Press Expanded View
8 Screw Press Expanded View Class A Option
9 Flow Schematic sgs809pncwa.ppt/9
10 FKC Screw Press sgs809pncwa.ppt/10 Tallahassee, FL, FKC Installation
11 FKC Screw Press sgs809pncwa.ppt/11 Petaluma, CA, FKC Installation
12 Huber Press sgs809pncwa.ppt/12 Magna, UT, Huber Installation
13 Huber Press sgs809pncwa.ppt/13 Maine, Huber Installation
14 sgs809pncwa.ppt/14 Performance Survey
15 Survey of 22 Full Scale Installations The Cake Solids Concentration Depends on Type of Sludge WAS PS+WAS Type of Sludge Screw Press Cake (% solids) Raw Anaerobically Digested FKC FKC (with steam and lime) Huber FKC Huber Raw Huber Aerobically Digested FKC > 18 Huber Anaerobically FKC Digested Huber sgs809pncwa.ppt/15
16 Survey of 22 Full Scale Installations The Median Cleaning Schedule is Once Per Week 30 Manual Cleaning Schedule (times per month) Facility Number sgs809pncwa.ppt/16
17 Case Study St Petersburg, FL sgs809pncwa.ppt/17
18 Pilot Results - Projected Full Performance St. Petersburg Parameter Manufacturers Recommendations Minimum Cake Solids Concentration (% solids) Maximum Polymer Dosage (lb/dt) Belt Press Centrifuge Screw Press Class B Class A Minimum Solids Capture (%) sgs809pncwa.ppt/18
19 Relative Cost Comparison BFP Centrifuge Screw Press Capital Cost $ $$$ $$ Building Modifications $ $$ $$ Odor Control $$$ $ $ Power $ $$$ $ Maintenance $$ $$ $ Chemical $$ $$$ $$ Hauling $$ $ $$ Disposal $$ $ $$ sgs809pncwa.ppt/19
20 Performance Comparison BFP Centrifuge Screw Press % Solids Produced Filtrate/Centrate Quality Reliability Operator Attention Required Ease of startup and shutdown Will Vary Depending on Conditions!!! sgs809pncwa.ppt/20
21 sgs809pncwa.ppt/21 Design Considerations
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/22
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/23
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: 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/24
25 sgs809pncwa.ppt/25 Rotary Press Technology
26 Rotary Press Manufacturers Fournier Prime Solutions sgs809pncwa.ppt/26
27 Rotary Press Schematic sgs809pncwa.ppt/27
28 Process Cutaway sgs809pncwa.ppt/28
29 Design Parameters Range of Capacity: gpm Cake % Solids: 12 28% Detention time: N/A Motor speed: as low as 1-3 rpm Motor HP: 5-20 HP sgs809pncwa.ppt/29
30 Fournier Rotary Press sgs809pncwa.ppt/30
31 sgs809pncwa.ppt/31 Size Compared to Other Technologies
32 Multiple Channels on Single Drive sgs809pncwa.ppt/32
33 Fournier Rotary Press Pilot Test sgs809pncwa.ppt/33
34 Prime Solutions Rotary Fan Press sgs809pncwa.ppt/34
35 sgs809pncwa.ppt/35 Performance Survey
36 Survey Results Facility Equipment Facility Size (mgd) Solids Type Incoming % TS Discharge % TS Raiford, FL Prison WWTP Front Royal, VA Municipal WWTP Fairfield, CA Municipal WWTP Lafayette, TN Municipal WWTP Portland, ME Municipal WWTP Hampton, NH Municipal WWTP Rotary fan press 1.1 Extended aeration Rotary fan press 3.3 Thermophilic Anaerobic Digestion Rotary fan press 15.5 Conventional Anaerobic Digestion Rotary press 0.5 Conventional Anaerobic Digestion Rotary press 19.8 Thickened PS/WAS Rotary press 2.5 Septage/PS/ WAS Murfreesboro, TN Municipal WWTP Rotary press 15 PS/WAS Scarborough, ME Municipal WWTP Rotary press 1.4 Thickened PS/WAS 3 28 sgs809pncwa.ppt/36
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 sgs809pncwa.ppt/37
38 Questions? Bob Gillette
39 sgs809pncwa.ppt/39 R&D Technologies
40 EKG Technologies Electrokinetic Geosynthetics (EKG) Technology Theory Electro-osmotic principle sgs809pncwa.ppt/40
41 Uses of EKG Technology Ashbrook Product Anaerobically/Aerobically Digested Sludge Fresno England Alternative to conventional dewatering Siemen s Product Secondary dewatering process Alternative to sludge drying sgs809pncwa.ppt/41
42 Siemen s ELODE Technology sgs809pncwa.ppt/42
43 Siemen s ELODE Technology sgs809pncwa.ppt/43
44 Siemen s ELODE Technology sgs809pncwa.ppt/44
45 Questions? Bob Gillette
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