Wednesday, November 4, 2009 at 12:33PM 
The necessity to create a viably renewable energy source and associate that source with the diversity of needs on the farm was a challenge. I strongly believe in the production of biofuels to meet energy needs. I think that the use of biofuels parallels some of the ideals that people share with organic farming. I also think that part of the biofuels could come directly from the farm. The idea for using algae came from research done in the first segment of this course, structure. The research being done now is taking what was learned from early research and expanding on it, to include genetically engineered strains of algae in order to find the highest yield strain.
The system I liked best however was one that was not totally concerned with mass production, but rather just production. This way they left the door open for the small scale operation. The diagram above is their network diagram explaining production, extraction and utilization. Similar to the original presentation on algae for structure, I would like to see this technology somehow be utilized in the walls of the buildings and used as an aesthetic design feature and outreach portion of the farm. A major reason that algae should be used for energy production is that it is not a food crop. This means that; minimal land is required, the growth cycle of the algae can be done in waste, brackish or salt water and in the process the water is cleaned, algae consumes substantial rates of CO2, and there are rapid harvest rates.
If given the right environment of growth, algae can double its weight several times a day. The exponential rate of growth combined with this systems live extraction, create a very efficient source of energy. Algae grown in ponds can produce around 15,000 gallons of useable bio-diesel per acre per year. It takes around 5,000 gallons to heat 5,000 sf of living space annually with a furnace (including hot water). That leaves 10,000 gallons to be used for machinery on the farm and any excess can always be sold. That is if all if it were grown in ponds. This system produces the algae in bioreactors that can be stacked vertically and produced at many different scales. The surface area greatly increases because algae grown in ponds can only successfully do it in a half inch mat. Bioreactors create a volume of algae to get all the light they need to produce so the production is a limit of space and not land surface area.
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