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

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Slide 1John Walsh afpa7a@bangor.ac.uk Determining the real value of on-farm Anaerobic Digestion Penderfynu gwir werth Treuliad Anaerobig (Anaerobic Digestion) ar y fferm Slide 2 Measure crop yield Measure leachate levels Above findings will provide the basic information to determine accurate economic values for AD, for government and farmer Aims and Objectives Nodau ac Amcanion Slide 3 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 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) MethodsDulliau Slide 4 Slide 5 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 ResultsCanlyniadau Slide 6 Crop YieldCynnyrch Cnwd Slide 7 Slide 8 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/ha on fertilizer expenditure Simple valuation: introduction of AD doubles the value of a farmers organic fertilizer Fertiliser SavingArbed Gwrtaith Slide 9 Mg/L NO 3 - Total NitrateCyfanswm Nitrad Slide 10 Total AmmoniumCyfanswm Amoniwm Slide 11 mg/L PO 4 Total PhosphateCyfanswm Ffosffad Slide 12 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 doesnt reflect all benefits of AD Positive externalities of AD have not been valued Feed-in TariffsTariffau Iw Cynnwys Slide 13 Doubles the value of fertilizer produced on farm. FITs and ROCs 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 Conclusions: ADCasgliadau: AD Slide 14 My supervisors for guidance: Prysor Williams, Gareth Edwards-Jones, Davey Jones AcknowledgementsDiolchiadau

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