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H2S Treatment of Landfill Gas at the Roosevelt Landfill
Daniel Waineo, Principal GC Environmental 107 SE Washington Street
Suite 243 Portland, OR 97214
Phone: 503-234-7984
E-mail: [email protected]
Kevin Ricks Klickitat Public Utility District
Phone: (509) 773-7430
E-mail: [email protected]
Phone: 503-234-7984
LFG Gas Treatment at Roosevelt
Landfill Gas Blower
First Stage Screw
Compressor
H2S Treatment
Aftercooler 1
Aftercooler 2
Dehydration
Siloxane Removal
Carbon Backup Vessels
Pipeline
Second Stage Screw
Compressor
Aftercooler 3
Mars Solar Turbines
Existing System
2013 Work
Phone: 503-234-7984
Landfill Gas Blowers/Flares
Phone: 503-234-7984
First Stage Compressors
Phone: 503-234-7984
Aftercooler 1
Phone: 503-234-7984
H2S Treatment
Phone: 503-234-7984
Aftercooler 2
Phone: 503-234-7984
Dehydration System
Glycol Pumps/Double Wall Tank
Phone: 503-234-7984
Dehydration System
New Chiller/Pipebridge
Phone: 503-234-7984
Dehydration System
Heat Exchangers/ Coalescing Filter
Phone: 503-234-7984
Siloxane Removal
Phone: 503-234-7984
Carbon Backup Vessels
Phone: 503-234-7984
Second Stage Compression
Phone: 503-234-7984
LFG Pipeline
Phone: 503-234-7984
Second Stage Compressor Cooler
Phone: 503-234-7984
Solar Mars 90 Turbines (2 x 10 MW) Combined Cycle
Phone: 503-234-7984
Upper and Lower Sites
Phone: 503-234-7984
Lower Compression Area
Phone: 503-234-7984
Turbine Plant
Phone: 503-234-7984
History of H2S treatment at Roosevelt
Old System (IC Engines 199x) ◦ Iron Sponge
Temporary New System for Turbines (2011) ◦ Sulfatreat
Final System (Summer 2013) ◦ Chelated Iron Hydrogen Sulfide Treatment
Phone: 503-234-7984
Solid Scavengers – Iron Sponge
Iron Sponge ◦ Dry Media of Iron-Oxide on Wood chips ◦ Does best using warm wet gas with Oxygen
◦ 4000 SCFM Treating 300 ppmv H2S
Phone: 503-234-7984
Solid Scavengers – Iron Sponge
Advantages ◦ Simple system ◦ Can be regenerated to some extent with a small Oxygen Stream ◦ Fairly low capital costs
Disadvantages ◦ Exothermic during media Regeneration/ Removal ◦ Costs for Media Replacement and Disposal of spent material ◦ Inconsistent Media Shape
Phone: 503-234-7984
Solid Scavenger – Sulfatreat
Sulfatreat (iron oxide on ceramic beads) ◦ Does best with warm, humid landfill gas with a small amount of Oxygen
◦ 6000 SCFM at 50 psig with 60 ppmv H2S
Phone: 503-234-7984
Solid Scavenger - Sulfatreat
Advantages ◦ Very simple system ◦ May be exothermic during media replacement ◦ Fairly low capital cost ◦ Uniform media shape
Disadvantages ◦ Media replacement costs ◦ Spent media disposal costs ◦ Water may be required to break and flush media from bed
Phone: 503-234-7984
Chelated Iron Processes
LO CAT® SulFerox®
Treatment at KPUD: ◦ Unlicensed Iron Chelate Process
Thanks to: ◦ Dow Chemical Provides chemicals and technical assistance
◦ Westfield Engineering Provided P&IDs Provided spargers vessels and heater skid
Phone: 503-234-7984
Chelated Iron Treatment
Unlicensed Chelated Iron Treatment System
Inle
t se
para
tor
Spa
rger
Tow
er
Out
let
Sep
arat
or
Reg
ener
ator
Settling Tank
Treated LFG
Sulfur Cake
Phone: 503-234-7984
Chelated Iron Treament
Chemistry Treatment: ◦ H2S + Fe+3L 2H+ + SO + Fe+2L
Regeneration: ◦ 1/2O2 + 2H+ + 2Fe+2L-> H2O + 2Fe+3L
Chelates: ◦ Keep the Iron in solution
Others: Caustic, Surfactants, degradation inhibitors
Phone: 503-234-7984
Chelated Iron Treatment
Sparger Vessels
Phone: 503-234-7984
Chelated Iron Treatment
Pipe Bridge
Phone: 503-234-7984
Chelated Iron Treatment
Regeneration and Settling Tanks
Phone: 503-234-7984
Chelated Iron Treatment
Heater Skid
Phone: 503-234-7984
Chelated Iron Treatment
Iron Chelate Pumps
Phone: 503-234-7984
Chelated Iron Treatment
Chemical Pumps
Phone: 503-234-7984
Chelated Iron Treatment
Sulfur Filter and Sulfur Cake
Phone: 503-234-7984
Insulated Dehydration System
Phone: 503-234-7984
Insulated Glycol Tank/Pumps
Phone: 503-234-7984
Insulated Settler Tanks
Phone: 503-234-7984
Insulated Heater Skid
Phone: 503-234-7984
Chelated Iron Treament
Advantages ◦ Low Cost of Operation ◦ No disposal (except sulfur cake) ◦ Continuous process Disadvantages ◦ High Capital Costs ◦ Process operates warm
Performance ◦ Inlet: 250 ppmv H2S ◦ Outlet:
Phone: 503-234-7984
Sulfur Plugging Issues
Heat exchanger plugging
Phone: 503-234-7984
Cake Consistency Issues
Phone: 503-234-7984
Sulfur Cake
Phone: 503-234-7984
Lessons Learned
Very reliable system that has been treating continuously since startup in July 2013
0.25% Oxygen in landfill gas is sufficient for regeneration (regenerator currently is bypassed)
100 lbs of Sulfur made per day (no market found yet)
Chemical use is a little higher than predicted (especially Caustic)
Phone: 503-234-7984
LFG H2S Treatment
Questions?
Kevin Ricks Klickitat Public Utility District (509) 773-7430
Daniel Waineo, P.E. GC Environmental (503) 234-7984
H2S Treatment of Landfill Gas at the Roosevelt LandfillLFG Gas Treatment at RooseveltLandfill Gas Blowers/FlaresFirst Stage CompressorsAftercooler 1H2S TreatmentAftercooler 2Dehydration SystemDehydration SystemDehydration SystemSiloxane RemovalCarbon Backup VesselsSecond Stage CompressionLFG PipelineSecond Stage Compressor CoolerSolar Mars 90 Turbines (2 x 10 MW) Combined CycleUpper and Lower SitesLower Compression AreaTurbine PlantHistory of H2S treatment at RooseveltSolid Scavengers – Iron SpongeSolid Scavengers – Iron SpongeSolid Scavenger – Sulfatreat�Solid Scavenger - SulfatreatChelated Iron ProcessesChelated Iron TreatmentChelated Iron TreamentChelated Iron TreatmentChelated Iron TreatmentChelated Iron TreatmentChelated Iron TreatmentChelated Iron TreatmentChelated Iron TreatmentChelated Iron TreatmentInsulated Dehydration SystemInsulated Glycol Tank/PumpsInsulated Settler TanksInsulated Heater SkidChelated Iron TreamentSulfur Plugging IssuesCake Consistency IssuesSulfur CakeLessons LearnedLFG H2S Treatment