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John Walsh afpa7a@bangor.ac.uk Determining the real value of on-farm Anaerobic Digestion

John Walsh afpa7a@bangor.ac.uk Determining the real value of on-farm Anaerobic Digestion Penderfynu gwir werth Treuliad Anaerobig (Anaerobic Digestion) ar y fferm. Aims and Objectives Nodau ac Amcanion. Measure crop yield Measure leachate levels

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John Walsh afpa7a@bangor.ac.uk Determining the real value of on-farm Anaerobic Digestion

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  1. John Walsh afpa7a@bangor.ac.uk Determining the real value of on-farm Anaerobic Digestion Penderfynu gwir werth Treuliad Anaerobig (Anaerobic Digestion) ar y fferm

  2. Aims and Objectives Nodau ac Amcanion • Measure crop yield • Measure leachate levels • Above findings will provide the basic information to determine accurate economic values for AD, for government and farmer

  3. Methods Dulliau • 5 reps, 70% field capacity • Managed for 15 weeks • Three harvests • Analysed for • Yield (crop) • Leachate: amount of N and P present (soil) • Bacterial and fungal growth (soil) • Two soil types • Conventional • Organic • Grass and grass/clover mix established • 5 treatments • Control; NPK; N; Fresh slurry; Liquid digestate • Normalised for N content (150 kg ha-1) • Applied via surface spreading

  4. Results Canlyniadau • Crop Yield • Fresh slurry (FS) produced half the yield of liquid digestate (LD) in 3 out of 4 treatments • No difference in yield between LD and NPK 21.8.11 in 3 out of 4 treatments • Leachate • LD and FS statistically the same level of leachate • NPK had more leachate than LD in all treatments

  5. Crop Yield Cynnyrch Cnwd

  6. Fertiliser Saving Arbed Gwrtaith • Digestate had double the yield of fresh cow slurry in 3 out of the 4 treatments • NPK 21.8.11 cost £281/tonne • At a rate of 150 kg N /ha, digestate saved £103/haonfertilizer expenditure • Simple valuation: introduction of AD doubles the value of a farmers organic fertilizer

  7. Total Nitrate Cyfanswm Nitrad Mg/L NO3-

  8. Total Ammonium Cyfanswm Amoniwm

  9. Total Phosphate Cyfanswm Ffosffad mg/L PO4

  10. Feed-in Tariffs Tariffau I’w Cynnwys • AD: 500 kW 11.5 (p/kWh) • AD: 500 kW 9.0 (p/kWh) • Wind: 15 kW – 100 kW 24.1 (p/kWh) • Wind: 100 kW – 500 kW 18.8 (p/kWh) • Wind: 500 kW – 1.5 MW 9.4 (p/kWh) • Current FITs price doesn’t reflect all benefits of AD • Positive externalities of AD have not been valued

  11. Conclusions: AD Casgliadau: AD • Doubles the value of fertilizer produced on farm. • FIT’s and ROC’s under priced for AD • Double advantage of reducing fossil fuel usage and cutting down on current GHG emissions • Only renewable energy source to do this • More nitrogen and phosphorus stays in the soil than inorganic fertilizers

  12. Acknowledgements Diolchiadau • My supervisors for guidance: Prysor Williams, Gareth Edwards-Jones, Davey Jones

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