CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Biofuel production and use, diagram. At far left the first stage is the source material (biomass, plant or other organic material). This is added to a separation tank (centre left). The cycle moving clockwise proceeds to the addition of enzymes (black barrels) in a hydrolysis tank, then yeast (yellow) added to a fermentation tank. At upper right, the distillation stage produces the biofuel to use in motor vehicles. At lower right, another separation tank converts the remaining biomass to pellets used for heating. At lower left, a converter extracts biogas from the residues of both the source and biofuel cycles. This gas can be used for heating.
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