Digesters - Metropolitan Water Reclamation District of Greater Chicago

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Current Digester Gas ProductionFrom 2007 – 2009 Plant Data• Avg Production: 3,400 Mcf/day• Avg VSR: 31% (low, typical = 40-50%)• Avg Gas Yield: 21.5 cf/lb VSR (high, typical = 12-18)Items affecting future SWRP Gas Production• Replacement of WS Imhoff tanks with Primary Settling Tanks• Upgrades to sludge thickening facilities• Increase in flows and loads projected by Master Plan(SWRP and NSWRP)
Projected Digester PerformanceVSR• VSR assumed to be low due todestruction of readily degradable VSin Imhoff Tanks• Future VSR with solids handlingimprovements should resembletypical range of 40-50%Gas Yield• A standard typical value of 16 cf/lb VSR was used
Page 1 and 2: Digester Gas Utilization at SWRPWhe
Page 3: Presentation Outline• Background/
Page 12 and 13: Digester Gas Production - Modeling
Page 15 and 16: Energy Consumption at SWRP• Build
Page 24 and 25: Energy Flow Scenarios:Digester Gas?
Page 26 and 27: Energy Flow Modeling Framework26
Page 28 and 29: Model Components - Gas Cleanings H2
Page 30 and 31: Model Components - Plant Energy Dem
Page 32 and 33: Projecting Future Energy Prices•
Page 34 and 35: Energy Flow Model - ScenariosScenar
Page 36 and 37: Energy Flow Model - Results$2,000,0
Page 38 and 39: Engine Operation Alternatives• Ba
Page 40 and 41: Updated Model Parameters• New Per
Page 42: Sensitivity Analysis - Electricity
Page 45 and 46: Triple Bottom Line Analysis• Econ
Page 47 and 48: Other Reference InstallationsMetrop
Page 49 and 50: Calls and Field Visits - Steam Turb
Page 51 and 52: Conclusions/Discussion• A Combine
Page 53 and 54: Sizing of Cogeneration SystemsCogen
Page 55 and 56:
Triple Bottom Line ScoringScenario
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Digesters - Metropolitan Water Reclamation District of Greater Chicago

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