"Algae For Entreprenuers" Free Report!

Algae have a number of advantages over other land based crops when considering the algae to biofuels equation.

• Much greater productivity than their terrestrial cousins
• Non-food resource
• Use otherwise non-productive land
• Can utilize saline water
• Can utilize waste CO2streams
• Can be used in conjunction with waste water treatment
• An algal biorefinery could produce oils, protein, and carbohydrates
• Algal cultivation can be 50x more productive than traditional crops
• Potential for culture in areas not used for crop production
  • Desert land
  • Ocean

Co-products

• Co-products from the algae, (omega-3 oils) depending on strain, can bring as much as $3,000/ton USD
• Animal and Fish Feeds are currently selling for $2000/ton USD

Cost Considerations

• Can use wild algae for ethanol production = free algae inputs
• Raceway ponds are economical to build.
• Supporting mechanical infrastructure costs can be offset with solar energy inputs.

Wild algae

• Have to be fast growers to survive in nature
• Generally contain <10% oil (lipid)
• Generally contain high carbohydrate >50%
• Can be grown in open raceways without fear of contamination

Using Raceway Ponds

• Raceways are low cost installations ($75 000/ha)
• Raceways consume very little power (10 kW/ha)
• Starch to ethanol conversion plant is relatively expensive and energy intensive (distillation)

High oil producing algae

• Are slower growers than wild algae – double every 2-3 days
• Can be selected for maximum oil content – 50% not unusual
• Heed to be grown in protected environment – typically PBR’s
• Most algae oil can be used for biodiesel production

Photobioreactors (PBR’s)

• Allow tight control of growing environment
• Optimize light usage
• Are capital intensive
• Are generally power intensive (300 kW/ha?)

Put simply, lipids in algae oil can be made into biodiesel, while the carbohydrates can be converted to ethanol. Algae are the optimal source for second generation bioethanol due to the fact that they are high in carbohydrates/polysaccharides and thin cellulose walls.

Bioethanol can be used as a biofuel which can replace part of the fossil-derived petrol. Currently bioethanol is produced by fermenting sugars, which in the case of corn are derived from hydrolyzing starch. Algae species starch contents over 50 percent have been reported. With new technologies, cellulose and hemicellulose can be hydrolyzed to sugars (Hamelinck et al., 2005), creating the possibility of converting an even larger part of algal dry matter to ethanol.