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Methane Gas Production from Dairy Manure at High Solids Concentration
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1980
Year
EngineeringGas ConversionGasificationAgricultural WasteAgricultural EconomicsAnaerobic DigestionAuger MixingAnaerobic CulturingVolatile SolidsUndiluted Dairy ManureBiogasMethane Gas ProductionBioremediationHealth SciencesIn Vitro FermentationWaste ManagementCoal Bed MethaneAnimal Waste ManagementGas ProductionEnvironmental EngineeringDigestate Treatment
ABSTRACT A70 L anaerobic digester was operated with undiluted dairy manure (average total solids20 percent for a 41-wk period. The loading rate was gradually increased for the first 28 wk to 11.6 g VS/L-d and was maintained at this level for the remaining 13 wk. Feeding the digester at this loading rate every other day established a deten-tion time of 15.1 d. During the last 13 wk the average total gas production, corrected to 20 C and 1 at-mosphere pressure, was 2.1 L/L digester-d. The methane content of this gas averaged 51.3 percent. Ap-proximately 25 percent of the volatile solids were destroyed under these operating conditions. Use of un-diluted manure and auger mixing for 10 min every half hour prevented scum formation.