Methane content of biogas accounted for 59.7372.43%. In the series where algae of the Cyanoprokaryota divisio served as the organic substrate, the yield of biogas production oscillated around 382.4579.24 dm3/kg o.d.m., biogas was produced at the mean rate of r¼97.14 cm3/d, and the percentage content of methane in biogas accounted for 63.0873.10%.