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 | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
Hexose | kg | 620 | 219 | 245 | Â | 156 | 620 | 173 | 190 | Â | 257 |
Pentose | Â | 60 | Â | Â | Â | 60 | 60 | Â | Â | Â | 60 |
Lignin | Â | 280 | Â | Â | 252 | 28 | 280 | Â | Â | 273 | 7 |
Other | Â | 40 | Â | Â | Â | 40 | 40 | Â | Â | Â | 40 |
Chemicals | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
SO2 | Kg | 15.48 | Â | Â | Â | 15.48 | 0.00 | Â | Â | Â | Â |
H2SO4 | Â | 0.00 | Â | Â | Â | Â | 63.20 | Â | Â | Â | 63.20 |
NaOH (50%) | Â | 28.96 | Â | Â | Â | 28.96 | 28.96 | Â | Â | Â | 28.96 |
NH3 (25%) | Â | 2.36 | Â | Â | Â | 2.36 | 1.68 | Â | Â | Â | 1.68 |
H3PO4 (50%) | Â | 0.52 | Â | Â | Â | 0.52 | 0.36 | Â | Â | Â | 0.36 |
Defoamer | Â | 0.56 | Â | Â | Â | 0.56 | 0.44 | Â | Â | Â | 0.44 |
(NH4)2PO4 | Â | 2.76 | Â | Â | Â | 2.76 | 2.60 | Â | Â | Â | 2.60 |
MgSO4.7 H2O | Â | 0.12 | Â | Â | Â | 0.12 | 0.12 | Â | Â | Â | 0.12 |
Enzymes | 106 FPUa | 9.36 | Â | Â | Â | 9.36 | 0.00 | Â | Â | Â | Â |
Electricity-buy | MWh | 0.18 | Â | Â | Â | Â | 0.18 | Â | Â | Â | Â |
Cooling water | m3 | 72.48 | Â | Â | Â | Â | 65.44 | Â | Â | Â | Â |
Process water | m3 | 3.36 | Â | Â | Â | 3.36 | 3.20 | Â | Â | Â | 3.20 |