Table 2 Process inputs per kg DM and per MJ produced (biodiesel, biogas and electricity) and heating demand, given as gross heat demand
| Â | Per kg DM straw | Per MJ produced | Units |
|---|---|---|---|
Straw harvesting and transport | |||
Diesel (harvesting and transport) | 0.34 | 0.05 | MJ |
Pretreatment | |||
Electricity | 0.07 | 0.01 | MJ |
Heat | 1.40 | 0.19 | MJ |
Sulphuric acid | 2.40 | 0.33 | g |
Hydrolysis | |||
Electricity | 0.06 | 0.01 | MJ |
Heat | 0.22 | 0.03 | MJ |
Enzymes | 11.9 | 1.62 | g enzyme product |
Lipid accumulation and yeast propagation | |||
Electricity | 1.16 | 0.16 | MJ |
Heat | 0.0 | 0.00 | MJ |
Ammonia | 13.0 | 1.77 | g |
Lipid extraction and purification | |||
Electricity | 0.14 | 0.02 | MJ |
Heat | 0.66 | 0.09 | MJ |
Hexane | 6.46 | 0.88 | g |
Sodium hydroxide | 0.32 | 4.4E−02 | g |
Phosphoric acid | 0.11 | 1.5E−02 | g |
Transesterification | |||
Electricity | 0.00 | 0.00 | MJ |
Heat | 0.23 | 0.03 | MJ |
Methanol | 12.5 | 1.70 | g |
Sodium hydroxide | 1.02 | 0.14 | g |
Phosphoric acid | 0.83 | 0.11 | g |
Anaerobic digestion | |||
Electricity | 0.32 | 0.04 | MJ |
Heat | 0.13 | 0.02 | MJ |