Impact of sward type, cutting date and conditioning temperature on mass and energy flows in the integrated generation of solid fuel and biogas from semi-natural grassland

摘要: The use of semi-natural grasslands for the production renewable energy through conventional conversion techniques faces major limitations due to chemical and physical properties biomass. A new procedure was developed which separates biomass, as silage, into a liquid phase biogas solid fraction be used fuel. Separation (mechanical dehydration) is carried out with screw press after mashing water (hydrothermal conditioning). effect hydrothermal conditioning at different temperatures (5°C, 60°C 80°C) mechanical dehydration on mass flows plant compounds fluid investigated five grassland pastures typical mountain areas Germany. Results show that 0.18 crude fibre transferred , whereas more digestible organic compounds, such protein nitrogen-free extract, showed 0.40 0.31, respectively. While 0.52 0.89 potassium (K), magnesium (Mg) chloride (Cl), are detrimental combustion cake, were fluid, than 0.50 calcium, has positive properties, remained in cake. Significantly (P < 0.05) higher detected (K Mg) 80°C (crude extract) compared 5°C treatment. Due separation solids liquids, high proportions P (0.61-0.74) K (0.64-0.85) but only 0.32-0.45 nitrogen exported from would recycled an application digestates anaerobic digestion liquid.