anaerobic digestion & markets for digestates

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Anaerobic digestion & markets for digestates. David Tompkins Agriculture Sector Specialist. About WRAP. WRAP’s vision is a world without waste, where resources are used sustainably. - PowerPoint PPT Presentation


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Anaerobic digestion & markets for digestatesDavid TompkinsAgriculture Sector Specialist1WRAPs vision is a world without waste, where resources are used sustainably.

We help businesses, individuals and communities reap the benefits of reducing waste, developing sustainable products and using resources in an efficient way.About WRAP2

Focus on food wasteReduction and re-use of food and drink wastes16Mt of post-farm gate food and drink waste5.3 Mt of avoidable household food wasteRepresenting over 20 million tonnes of CO2e3% of total UK GHG emissions6% of total UK water footprint1 in 4 cars on the road in the UKIdeally this waste would be preventedWhere this is not possible, it should be recycledComposting offers one solutionAD offers another with the advantage of renewable energy

Main WRAP driverIf 5 Mt of food waste was digested this would replace 47,500 tonnes of nitrogen (N), 14,720 tonnes of phosphate (P2O5) and 20,400 tonnes ofpotash (K2O), saving a total of 386,000 tonnes of CO2-equivalent in GHG emissions.

Areas under cropping in GB= 4,387,700ha. Mean N use = 145kg/ha = 636,216.5 tonnes of N fertiliser per annum. Digestate could meet ~13% of GB fertiliser-N demand


Anaerobic digestion (AD)

Anaerobic digestion (AD)

Farm-fedFood-waste-fedIndustrial processes in the UK

107 operational facilities44 farm-fed (manures, slurries, crops)47 food-waste-fed (households)16 industry-fed (distilleries, dairies)Total capacity ~5Mtpa~ 230 more plants in planning

6Classification by input:Manures and purpose-grown crops Waste-derived:Source-segregatedMixedBiosolids and co-digestates

AD can be:Wet (