In the case of algae biomass co-fermentation with maize silage, the production of biogas was observed to increase from
438.73725.21 dm3/kg o.d.m. in the variant where only algae biomass was subject to fermentation to 628.00713.72 dm3
/kg o.d.m. in the variant where the ratio of o.d.m. of algae biomass/o.d.m. of maize silage was 40/60. The content of methane in biogas ranged from 65.1271.94% to 60.6274.13%. The greater contribution of maize silage affected a decrease in the effectiveness of the