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

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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 - PowerPoint PPT Presentation

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<ul><li><p>John Walshafpa7a@bangor.ac.uk</p><p>Determining the real value of on-farm Anaerobic Digestion</p><p>Penderfynu gwir werth Treuliad Anaerobig (Anaerobic Digestion) ar y fferm</p></li><li><p>Measure crop yield</p><p>Measure leachate levels </p><p>Above findings will provide the basic information to determine accurate economic values for AD, for government and farmerAims and Objectives Nodau ac Amcanion</p></li><li><p>Two soil typesConventional OrganicGrass and grass/clover mix established5 treatmentsControl; NPK; N; Fresh slurry; Liquid digestate Normalised for N content (150 kg ha-1)Applied via surface spreading5 reps, 70% field capacityManaged for 15 weeksThree harvests</p><p>Analysed forYield (crop)Leachate: amount of N and P present (soil)Bacterial and fungal growth (soil)</p><p>MethodsDulliau</p></li><li><p>Crop YieldFresh slurry (FS) produced half the yield of liquid digestate (LD) in 3 out of 4 treatmentsNo difference in yield between LD and NPK 21.8.11 in 3 out of 4 treatments</p><p>LeachateLD and FS statistically the same level of leachateNPK had more leachate than LD in all treatments</p><p>ResultsCanlyniadau</p></li><li><p>Crop YieldCynnyrch Cnwd</p></li><li><p>Digestate had double the yield of fresh cow slurry in 3 out of the 4 treatments</p><p>NPK 21.8.11 cost 281/tonneAt a rate of 150 kg N /ha, digestate saved 103/ha on fertilizer expenditure</p><p>Simple valuation: introduction of AD doubles the value of a farmers organic fertilizer </p><p>Fertiliser SavingArbed Gwrtaith</p></li><li><p>Mg/L NO3-Total NitrateCyfanswm Nitrad</p></li><li><p>Total AmmoniumCyfanswm Amoniwm</p></li><li><p>mg/L PO4Total PhosphateCyfanswm Ffosffad</p></li><li><p>AD: 500 kW 11.5 (p/kWh)AD: 500 kW 9.0 (p/kWh)</p><p>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) </p><p>Current FITs price doesnt reflect all benefits of ADPositive externalities of AD have not been valued</p><p>Feed-in TariffsTariffau Iw Cynnwys</p></li><li><p>Doubles the value of fertilizer produced on farm.</p><p>FITs and ROCs under priced for AD</p><p>Double advantage of reducing fossil fuel usage and cutting down on current GHG emissionsOnly renewable energy source to do this</p><p>More nitrogen and phosphorus stays in the soil than inorganic fertilizers </p><p>Conclusions: ADCasgliadau: AD</p></li><li><p>My supervisors for guidance: Prysor Williams, Gareth Edwards-Jones, Davey JonesAcknowledgementsDiolchiadau</p><p>****</p></li></ul>