Fuel of the Future?
Algae gave us life. Thanks to photosynthesis, algae created an atmosphere on our planet that allowed “higher” life forms to develop. Algae (with help from anaerobic bacteria, time and pressure) also gave us fossil fuels, which ironically could be our eventual undoing.
Another issue with making ethanol from corn is the environmental impact. Corn requires intensive agricultural practices, including repeated land disturbance, fertilizers and pesticides. These land practices have a negative effect on water quality, several of which the LMVP volunteers monitor by measuring sediments, nutrients and algae. Finally, there is the issue of using food as fuel. Thanks to the laws of supply and demand, corn prices will continue to escalate. Higher costs for basic human and animal food are to blame for the recent riots in Mexico over tortilla prices.
Another familiar crop doesn’t get as much media coverage; algae. The Department of Energy began researching algae as an energy source in 1978. Initially, research was focused on using algae to produce hydrogen. In the early 1980s emphasis was redirected to biofuel production (particularly ethanol) until the DOE eliminated the funding in 1996. There has been a resurgence of attention to algae lately, as crude oil prices approach the $100 per barrel mark.
Here’s how it might work. Carbon dioxide from a coal burning power plant would be directed into a series of ponds or chambers rather than emitted to the atmosphere. The CO2 would be used by algae as a carbon source. Municipal waste effluent might be added to the ponds for nutrients and, given enough sunlight, algae could flourish. Algae would be encouraged (or engineered) to produce more lipids, or fats, that would be extracted and processed into liquid fuel. The remaining solids could be compressed and burned as a solid fuel or given to animals as a feed supplement. Much of the water used to grow the algae could be recyled.
Power plants could offset their carbon footprint by as much as 40%, fewer nutrients would go into our waterways, food crops could feed people and animals, and we could gain some independence from oil imports. And, lowly algae might get the respect they deserve.