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Prospective life cycle carbon abatement for pyrolysis biochar systems in the UK

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  • Hammond, Jim
  • Shackley, Simon
  • Sohi, Saran
  • Brownsort, Peter

Abstract

Life cycle assessment (LCA) of slow pyrolysis biochar systems (PBS) in the UK for small, medium and large scale process chains and ten feedstocks was performed, assessing carbon abatement and electricity production. Pyrolysis biochar systems appear to offer greater carbon abatement than other bioenergy systems. Carbon abatement of 0.7-1.3 t CO2 equivalent per oven dry tonne of feedstock processed was found. In terms of delivered energy, medium to large scale PBS abates 1.4-1.9 t CO2e/MWh, which compares to average carbon emissions of 0.05-0.30 t CO2e/MWh for other bioenergy systems. The largest contribution to PBS carbon abatement is from the feedstock carbon stabilised in biochar (40-50%), followed by the less certain indirect effects of biochar in the soil (25-40%)--mainly due to increase in soil organic carbon levels. Change in soil organic carbon levels was found to be a key sensitivity. Electricity production off-setting emissions from fossil fuels accounted for 10-25% of carbon abatement. The LCA suggests that provided 43% of the carbon in the biochar remains stable, PBS will out-perform direct combustion of biomass at 33% efficiency in terms of carbon abatement, even if there is no beneficial effect upon soil organic carbon levels from biochar application.

Suggested Citation

  • Hammond, Jim & Shackley, Simon & Sohi, Saran & Brownsort, Peter, 2011. "Prospective life cycle carbon abatement for pyrolysis biochar systems in the UK," Energy Policy, Elsevier, vol. 39(5), pages 2646-2655, May.
    • Handle: RePEc:eee:enepol:v:39:y:2011:i:5:p:2646-2655
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    References listed on IDEAS

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