James.Gaffey@staff.ittralee.ie
Key drivers towards green biorefinery project James.Gaffey@staff.ittralee.ie
Cattle feed trials: Silage v Presscake Target: Reduce N and P emissions by 25%! 30 cows from autumn calving dairy herd. • Control Press cake Predicated DMI 21.64 21.64 Trials assess DMI milk yield, milk composition, rumen • (kg DM/day) health Environmental impacts: Measuring levels of N and P CP% 18.6 15.9 • and Methane emission study (RUmen SImulation TEChnque (RUSITEC) NDF% 38.3 45.6 UFL 18.94 17.33 Press cake Control (n=15) (n=15) Grass silage 14 kg DM 5 kg DM Press Cake - 9 kg DM Concentrate 7.12 kg DM 7.12 kg DM Soya bean meal 0.44 kg DM 0.44 kg DM
Pig feed trials: Green protein as soya replacement Target: Increase N-use effiency by 40%! Wet and dry feeding pig feed trials with • early finisher pigs Wet protein 15% DM approximately • DMI, Average Daily Gain, Health & • Mortality, Dung consistency and pig/pen cleanliness Pig feed well received by pigs in wet • feeding More comprehensive dry pig feed planned • Future: Plant protein for humans Turning green protein in white protein? •
Grass whey to value • High-value fructo-oligosaccharides in whey • 30-70% of sugars in grass in form of FOS 1 feedstock into 4 products • Concentration, separation, analysis and comparison with on-the- market FOS • Applications in animal nutrition to improve gut health or cosmetics Residual stream to biogas • 95% of biogas produced by day 6 • Biogas potential somewhere between cattle slurry (28.8L/kg) and fresh leachate from green compost (40.32L/kg) • Possibility to co-digest with high carbon feedstocks • Methane composition of gas >60% • The P and K value of digestate suitable for fertilizer use
Advantages of small-scale grass biorefinery approach Reduced Emissions Protein optimisation Farmer Empowerment Lower CAPEX Cascading and product diversification Local socio-economic Nutrient recycling benefits
Implementation on the farm
How small-scale biorefineries can work for farmers Local model 20km2 Distributed model 20-30 farmers Keep whey minerals and water on the farm Celluose Plant Products used locally or upgraded centrally Feeding mill Scale out not scale up Suitable for fragmented supply chains
@BiorefineryGlas https://biorefineryglas.eu https://www.youtube.com/watch ?v=Z1UFHU-rt9s James.gaffey@staff.ittralee.ie
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