The premises for using waste from zootechnical complexes in cultivation of Chlorella vulgaris algae

In this study, investigated the use of combined waste from poultry, livestock and pig farms to produce nutrient media for cultivating the alga Chlorella vulgaris Beij. The main objective was to assess the potential of algal biomass obtained in agriculture, especially for animal feed and as a biofertilizer. The results showed that the most optimal nutrient medium for growing algae was 5% wastewater, which made it possible to obtain a significant amount of algal biomass (2.51 g/l BAU) in a short period of time (6 days). This option recorded the highest values of the reproduction rate (0.08 days⁻¹), population growth rate (0.90 days⁻¹) and reproduction coefficient (1.75 days⁻¹). Also, biochemical analysis of the biomass showed a high content of proteins (57.01±1.40%) and carbohydrates (33.00±0.81%) in the medium with 5% wastewater, and in the medium with 10% wastewater, an increased amount of lipids was observed (10.00±0.21%). The conclusion of the study indicates that the proposed nutrient medium is effective for obtaining valuable, cheap algal biomass applicable in agriculture and environmental protection, and can be recommended for industrial cultivation of Chlorella vulgaris algae.