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Table 1 Key techno-economic metrics of the assessed biorefining pathways

From: Techno-economic assessment for the production of algal fuels and value-added products: opportunities for high-protein microalgae conversion

  MOTU MA
Minimum solid coproduct selling price ($/dry ton) to support $2.5/GGE fuel price $1033 $899
Fuel yield (GGE/AFDW ton) 34.9 44.6
Fuel yield (MMGGE/yr) 6.6 (0.3 naphtha, 6.3 diesel) 8.4 (6.9 alcohols, 1.5 FAFE)
Fuel C/O molar ratio n/a (negligible oxygen content) 5.1 (4.6 alcohols, 11.3 FAFE)
Solid coproduct yield (lb/AFDW ton) 1009 1009
Polyurethane coproduct yield (lb/AFDW ton) 254 (140)a 254 (140)a
Carbon utilization (% of algal carbon)
 Fuel 19.6% 25.2%
  Naphtha 0.9%
  Diesel 18.7%
  Mixed alcohols fuel 20.6%
  FAFE 4.6%
 Solid coproduct 38.2% 38.2%
 Polyurethane (algal carbon only) 11.0% 11.0%
 Total 68.9% 74.4%
Revenue breakdown (% of total)
 Fuel 7% 10% (8% alcohols, 2% FAFE)
 Solid coproduct 42% 38%
 Polyurethane 41% 43%
 Nutrient recycle 10% 9%
Fixed capital investment ($MM) $290 MM $251 MM
Raw materials, utilities, and waste ($MM/yr) $178 MM/yr $174 MM/yr
 Feedstock 60.0% 61.5%
 Enzymesb 1.6% 2.0%
 Natural gas 5.9% 7.7%
 Electricity 4.3% 4.3%
 Polyurethane inputs 15.8% 16.2%
 Catalysts 2.0% n/a
 H2 0.7% n/a
 Other chemicals 9.7% 8.2%
  1. aFirst number includes total mass of polyurethane, including diisocyanate co-reactant and other chemicals; number in parenthesis includes only mass from algae feedstock
  2. bCellulase for MOTU pathway; cellulase and lipase for MA pathway