A recent published article in an open access paper in the ACS journal Environmental Science & Technology is about ethanol production process that capable to reduce carbon footprint up to 87 per cent. This amazing discovery is a reported analysis by a team from Algenol and Georgia Tech that are working on developing ethanol based bio fuel from algae in photo bioreactors connected to fossil fuel power plants.
The ethanol production process uses a culture medium that consists of cyanobacteria grown in flexible-film polyethylene-based photo bioreactors containing seawater or brackish water.
And surprisingly, in order to support efficient growth of those natural bio producer for ethanol, the bio reactor itself is built near a fossil-fuel power plant to ensure sufficient supply of CO2 for the algae. The use of industrial CO2 in the direct ethanol technology causes 67% to 87% reduction in carbon footprint on an energy equivalent basis for initial ethanol concentrations ranging from 0.5% to 5%.