Algae farming takes advantage of warmth and CO2 from an Ethanol biorefinery. These by-products are rarely harnessed in most ethanol production. It could mean important new revenues for ethanol producers.
BioProcess Algae and Green Plains Renewable Energy Break Ground For Algae Production Facility in Shenandoah, IA Grainnet:

The horizontal reactors have been successfully running outdoors since the fall of 2011 and this marks the next step in the project to commercialize algae focused on markets for animal feed, fuel, omega-3 products and high-value nutraceuticals.