BASIC DATA ON BIOGAS - Energikontor Sydost

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Swedish Gas Centre: Basic Data on BiogasParameters for the biogas processLoading rateAmount of substrate added to the digester. Expressede.g. as kg VS per m 3 digester and day.Biogas production Amount of produced biogas expressed e.g. Nm 3 per tonTS.C/N-quota Relation between carbon and nitrogen content in thesubstrate.Pretreatment Prior to digestion, many substrates needs to bepretreated. This pretreatment can be pasteurisation,thickening or disintegration.Volatile Solids –VSMesophilicDigestionMethaneconcentrationMethane yieldThermophilicDigestionTotal Solids – TSWeight of organic matter in the substrate. Normallyexpressed as percentage of TS.Digestion at 25-40°C. Usually around 35-37°C.Amount of methane in the biogas. Normally expressedas percentage by volume.Amount of produced methane expressed e.g. Nm 3 perton TS.Digestion at 50-60°C. Usually around 50-55°C .The weight of the substrate after drying. Normallyexpressed as percentage of wet weight. Also called drymatter (DM)Dry Digestion Digestion of substrate with TS around 15-35 %.Hydraulicretention timeThe average time that the substrate is inside thedigester.Degradation of VS Describes how much of the substrate that is degradedin the digester. Usually expressed as percentage of VS.Wet digestion Digestion of substrate with TS around 2-15 %.Wet weightThe weight of the substrate including water.4
Swedish Gas Centre: Basic Data on BiogasBiogas production for different substratesThe biogas production varies between different substrates depending onthe composition of the substrate. The biogas production figures in the tablebelow are determined in laboratory scale and therefore higher thanexpected during continuous operations in full scale.SubstrateMethaneTS Biogas productionconcentration[m[%] [m 3 /ton TS]/ton[%]wet weight ]Sludge from wastewatertreatment plants5 300 15 65Fish waste 42 1 279 537 71Straw 78 265 207 70Sorted food waste 33 618 204 63Liquid cattle manure 9 244 22 65Potato haulm 15 453 68 56Slaughter house waste 16 575 92 63Liquid pig slurry 8 325 26 65Sources: Substrathandbok för biogasproduktion, SGC, 2009Den svenska biogaspotentialen från inhemska restprodukter, 2008Ökad biogasproduktion vid Henriksdals reningsverk, 20095
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Page 6 and 7: SubstrateSwedish Gas Centre: Basic
Page 10: Biogas production from cropsBiogas
Page 13 and 14: Energy content of biogasA typical n
Page 15 and 16: Utilisation of biogasSwedish Gas Ce
Page 17 and 18: Biogas as vehicle fuelSwedish Gas C
Page 19 and 20: Electricity productionElectricity i
Page 21 and 22: Environmental benefitsSwedish Gas C
Page 23 and 24: Permits and inspectionsSwedish Gas
Page 25 and 26: Conversion between different unitsC
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BASIC DATA ON BIOGAS - Energikontor Sydost

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