Substrate Types
Economic fertilizer Slurry or liquid manure
Mixture of fecal/urine with little straw
Keeping of animals on slatting floors, gratings
High water content —> Good pumpable
Examples
Cattle slurry —> primarily carbohydrates
Pig slurry —> primarily proteins —> higher methane content
Disadvantages and Advantages of renewable raw material
Energy plants:
Silage maize
Grain whole plant silage
Grass silage
—> Higher biogas/methane yield than manure
Agro-industrial substrates
Brewery grain from beer making industry
Mash from alcohol extract
Sugar manufacture (press cutlet, molasses)
Fruit processing (pomace)
Starch from potato processing (pulp, residual fluid)
Organic residues from household
Organic waste collection bins
Deep-frying fats
Glycerol from biodiesel plants
Leftover and slaughter residues
Landscape management material
Substrate Composition
Water content concentration for different substrates
The higher the gas yield per kg the less water it contains
Cereal Grains - 12 to 15% water content.
Root tubers - 75 to 85% water content.
Commercial feed - 10 to 15% water content.
Silage - 80% water content.
—> Silage highest, root tubers, cereal grains, commercial feed
Factors to be considered in selecting substrate
Factors to consider in choosing technology of plant
Economic Analysis from the plant
Sustainability
Nutrient balance / digestate planning
Last changed6 months ago