Harvesting Fuel From Algae
Wednesday, November 4, 2009 at 2:32PM
In the 2008 growing season the tractor on the farm used 40.7 gallons. We calculate that an algae growing system covering 40 square feet of land running only half of the year could produce over 46 gallons of biofuel. The system would be constructed of plastic tubing arranged in vertical walls with water running through it which would act as the algae growing medium (called a photobioreactor). Necessary inputs to the system are carbon dioxide, water, and nutrients. Outputs are the algae biomass and oxygen. The algae biomass would have its oils pressed out to be used as fuel. The non-lipid biomass would be degraded to produce carbon dioxide, methane and excess biomass. The CO2 and excess biomass would be put back into the growing system to use as nutrients. Excess methane could be used as an extra fuel source.
Algae is one of the best crops for producing fuel because they are some of the fastest growing plants and reproduce within days. Algae are single celled organisms, nutrients supplied to the algae has a high conversion factor into usable biomass compared to say the unusable roots produced in higher plants. Algal strains used in biofuel production can produce 60% of their biomass as lipids which are used for the biodiesel. Although there are necessary inputs for growth and extraction our system could potentially maintain its own CO2 and nutrient requirements.
The extraction process would require a manual press. Depending on the engine of the tractor the extracted oil could be straight, otherwise a conversion kit would have to be used on the tractor.
The walls and accessory parts for this system would be movable and probable set alongside the paths or fallow fields.
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