March 30, 2007
HARVESTING ALGAE ENERGY for pond-powered biofuels:
The science is simple: Algae need water, sunlight and carbon dioxide to grow. The oil they produce can then be harvested and converted into biodiesel; the algaeâ€™s carbohydrate content can be fermented into ethanol. Both are much cleaner-burning fuels than petroleum-based diesel or gas.
The reality is more complex. Trying to grow concentrations of the finicky organism is a bit like trying to balance the water in a fish tank. Itâ€™s also expensive. The water needs to be just the right temperature for algae to proliferate, and even then open ponds can become choked with invasive species. Atmospheric levels of CO2 also arenâ€™t high enough to spur exponential growth.
Solix addresses these problems by containing the algae in closed â€œphotobioreactorsâ€â€”triangular chambers made from sheets of polyethylene plastic (similar to a painterâ€™s dropcloth)â€”and bubbling supplemental carbon dioxide through the system. Eventually, the source of the CO2 will be exhaust from power plants and other industrial processes, providing the added benefit of capturing a potent greenhouse gas before it reaches the atmosphere.
Read the whole thing.