Anaerobic Digestion - Yampa Valley Sustainability Council · 2017-03-07 · biogas Acetic acid...
Transcript of Anaerobic Digestion - Yampa Valley Sustainability Council · 2017-03-07 · biogas Acetic acid...
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AnaerobicDigestion
SybilSharvelleAssociateProfessor
ColoradoStateUniversity
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PresentationOverview
• Anaerobicdigestion(AD)process• ADtechnology• Usesforbiogas
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AnaerobicDigestionProcess
AnaerobicDigester Liquid
Fertilizer
Compost
CH4
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ADProcess
•BiologicalProcess•Applicableforhighorganiccontentwaste
• Inabsenceofoxygen,carbonisconvertedtomethane
•Worksbestat35oC
Source: Renewable Energy Association
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ADProcessSchematic
Hydrolysis
Acido/Acetogenesis
Methanogenesis
Solubleorganiccompounds
Methanebiogas
Aceticacid
Biodegradablewaste
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TechnologyDependsonWasteQuality
• OrganicFractionMunicipalSolidWaste• Highsolids• InorganicContaminants
• Manure• Dependsonmanagementpractice
• LiquidWastewater(e.g.foodprocessing)• Lowsolidsandhighorganicmatter
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MunicipalSolidWastes
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MunicipalSolidWastes:LandfillBasedDigester
YoloCounty,California
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MunicipalSolidWastes:AdditiontoAnaerobicDigester
EastBayMunicipalUtilityDistrict
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https://erams.com/AD_feasibility/
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AD:HighOrganicLiquidWasteMaterial
Upflow SludgeBlanket FixedFilm
FixedFilmAnaerobicDigester
0-1%TS
Inlet
Outlet
UpFlowAnaerobicSludgeBlanket
Digester1-5%TS
Inlet
Outlet
SludgeBlanket
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NewBelgiumBreweryAnaerobicDigester
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RegionalBiodigester:HeartlandBiogas
•WeldCountynearLaSalleCO
•4,700MMBtu•PowerPurchaser:SacramentoMUD
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UsesforBiogas
MethaneGas
Cogeneration
Electricity Hot Water
Purification to SupplyNatural Gas Lines Boiler
Purification and
Liquifaction
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PurificationforNaturalGasPipeline
• Organics(siloxane),waterremoved
• H2Sreducedto5ppm• CO2 Removal
Source: SEECO
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VehicleFuel
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Comparision toOtherFuels
Source:NGVA,2009
Fuel LHV (MJ/kg) CO2 (g/kWh) TheoreticalCO2Reduction (%)
Methane/Biomethane 50.0 198.0 29.2
Propane 45.6 236.8 15.3
Butane 45.3 241.2 13.7
Diesel 42.7 267.5 4.3
Gasoline 42.4 279.5 0.0
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Summary
• Anaerobicdigestioncreatesvaluableproductsfromwastematerial
• Technologyselectiondependsonwastematerial• Manyusesforbiogas