DIGESTER GAS ENERGY RECOVERY ALTERNATIVES

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Alternatives – CNG VehiclesCost analysis for implementation at SWWTP, based on:– Sell gas not used for CNG to pipeline at $7.00 per MMBTU– Capital cost of $4,000,000 amortized at 4.5% interest– Electrical costs of 8 cents per kWh– Additional O&M expense of $25,000 per year– CNG demand of 100 GGE per dayCNG cost of approximately $1.60 per GGE for “break even”
Summary and ConclusionsElectrical and thermal energy savings– Electrical: $15,000 + per year per MGD of plant capacity– Heating: $7,000 + per year per MGD of plant capacityElectrical and thermal recovery system costs– Return on investments ~ 3 to 7 yearsClean natural gas and CNG– Public / private partnerships or facility-owned– Not profitable for smaller plantsVarying energy costs can have substantialimpact on the return on investment
Page 1 and 2: DIGESTER GASENERGY RECOVERYALTERNAT
Page 3 and 4: Digester Gas ProductionAnaerobic di
Page 5 and 6: SWWTP Digester Gas ProductionAt tim
Page 7 and 8: Digester Gas Trace ConstituentsHydr
Page 9 and 10: Hydrogen Sulfide RemovalSorption te
Page 11 and 12: Carbon Dioxide RemovalGenerally not
Page 13 and 14: Levels of TreatmentPipeline Quality
Page 15 and 16: Possible Implementation of Electric
Page 17 and 18: Alternatives - Clean Natural Gas Sa
Page 19: Alternatives - CNG VehiclesInstalla

DIGESTER GAS ENERGY RECOVERY ALTERNATIVES

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