From: The greenhouse gas emissions performance of cellulosic ethanol supply chains in Europe
Parameter | Unit | Base-case value.unit-1 | % Variation relative to base-case | Remark | |
---|---|---|---|---|---|
Min | Max | ||||
Softwood production transport and size reduction | 46.0 | 0.5 | 1.9 | Range reflects the difference between high and low estimates for softwood emissions, excluding land-use change | |
kgCO2e.odt-1 | |||||
Straw production and transport | 2.6 | 0.5 | 2 | This range is illustrative only and reflects variation around the lower estimate for straw | |
Enzyme production | kgCO2e.kg protein-1 | 9.55 | 0.1 | 1.4 | Range reflects the carbon intensity of enzyme manufacture using Swedish or UK electricity relative to EU 27 |
Process electricity purchased | kgCO2e.MWh-1 | 340.8 | 0.1 | 1.4 | Range reflects the carbon intensity of Swedish and UK electricity relative to EU 27 |
H2SO4a | 0.5 | 0.5 | 2 | A range of -50% to +100% was considered sufficient | |
to cover uncertainties in production emissions | |||||
NaOHb | 0.58 | ||||
SO2a | kgCO2 | 0.641 | |||
e.kg-1 | |||||
(NH4)2PO4c | 1.67 | ||||
MgSO4.7 H2Od | 0.56 |