From: The greenhouse gas emissions performance of cellulosic ethanol supply chains in Europe
Feedstock/co-product (units) | Mass balance | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Enzymatic processb | Dilute acid processb | ||||||||||
Input
(unit.odt-1) |
Output
(unit.odt-1) |
Input
(unit.odt-1) |
Output
(unit.odt-1) | ||||||||
Ethanol | CO2 | Solid fuel |
Waste (solid + liquid) | Ethanol | CO2 | Solid fuel |
Waste (solid + liquid) | ||||
Biomass | |||||||||||
Hexose | kg | 620 | 219 | 245 | 156 | 620 | 173 | 190 | 257 | ||
Pentose | 60 | 60 | 60 | 60 | |||||||
Lignin | 280 | 252 | 28 | 280 | 273 | 7 | |||||
Other | 40 | 40 | 40 | 40 | |||||||
Chemicals | |||||||||||
SO2 | Kg | 15.48 | 15.48 | 0.00 | |||||||
H2SO4 | 0.00 | 63.20 | 63.20 | ||||||||
NaOH (50%) | 28.96 | 28.96 | 28.96 | 28.96 | |||||||
NH3 (25%) | 2.36 | 2.36 | 1.68 | 1.68 | |||||||
H3PO4 (50%) | 0.52 | 0.52 | 0.36 | 0.36 | |||||||
Defoamer | 0.56 | 0.56 | 0.44 | 0.44 | |||||||
(NH4)2PO4 | 2.76 | 2.76 | 2.60 | 2.60 | |||||||
MgSO4.7 H2O | 0.12 | 0.12 | 0.12 | 0.12 | |||||||
Enzymes | 106 FPUa | 9.36 | 9.36 | 0.00 | |||||||
Electricity-buy | MWh | 0.18 | 0.18 | ||||||||
Cooling water | m3 | 72.48 | 65.44 | ||||||||
Process water | m3 | 3.36 | 3.36 | 3.20 | 3.20 |