Transactions of the ASAE · 1984 · 15 citations · 0 references
AgricultureAgricultural EngineeringDairy ScienceDairy Waste ManagementSolid Waste ManagementWaste ManagementManure ManagementManure Nutrient ManagementNutrient DigestionNutrient RetentionSludge ManagementWaste UtilizationDairy Manure ManagementManure Application RatesManure DigestionManure Nutrient CompositionManure Nutrient RetentionPlug FlowPlug Flow BehaviorResource Recovery From Dairy Manure
ABSTRACT Apilot scale 1 m^ plug flow digester was operated for 18 months to determine the rate of solids accumulation for fresh dairy manure at 9.0%, 12.4%, and 15.2% TS. Temperature was maintained at 351C, and a 15 d retention time was established. Greatest gas production (1.31 gas vol/digester vol/day) with minimal solids accumulation occurred with the 15.2% TS feedstock. Least gas production (0.60 gas vol/digester vol/day) and greatest solids accumulation occurred with the 9.0% TS feedstock. At this latter concentration solids accumulated at a rate of 0.3% digester volume per day. Approximately 85% of this accumulation occurred in the scum layer; the remaining 15% occurred in the sludge region. For fresh dairy manure a feedstock of between 13% and 15% TS appears most ideal.