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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  • John Walshafpa7a@bangor.ac.uk

    Determining the real value of on-farm Anaerobic Digestion

    Penderfynu gwir werth Treuliad Anaerobig (Anaerobic Digestion) ar y fferm

  • Measure crop yield

    Measure leachate levels

    Above findings will provide the basic information to determine accurate economic values for AD, for government and farmerAims and Objectives Nodau ac Amcanion

  • 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

    Analysed forYield (crop)Leachate: amount of N and P present (soil)Bacterial and fungal growth (soil)

    MethodsDulliau

  • 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

    LeachateLD and FS statistically the same level of leachateNPK had more leachate than LD in all treatments

    ResultsCanlyniadau

  • Crop YieldCynnyrch Cnwd

  • Digestate had double the yield of fresh cow slurry in 3 out of the 4 treatments

    NPK 21.8.11 cost 281/tonneAt 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

  • Mg/L NO3-Total NitrateCyfanswm Nitrad

  • Total AmmoniumCyfanswm Amoniwm

  • mg/L PO4Total PhosphateCyfanswm Ffosffad

  • 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 ADPositive externalities of AD have not been valued

    Feed-in TariffsTariffau Iw Cynnwys

  • 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 emissionsOnly renewable energy source to do this

    More nitrogen and phosphorus stays in the soil than inorganic fertilizers

    Conclusions: ADCasgliadau: AD

  • My supervisors for guidance: Prysor Williams, Gareth Edwards-Jones, Davey JonesAcknowledgementsDiolchiadau

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