The paper presents results of the study on efficient production of microalgae (Chlorella sp.) biomass. Culture was conducted on the basis of synthetic medium, in a laboratory storage tank photobioreactor with an active volume of 5 dm³, under forced aeration and mixing conditions. The culture control consisted in the spectrophotometric measurement of changes in the optical density of the culture medium as well as the determination of basic nutrients (total nitrogen and phosphorus) in the culture medium. In addition, Chemical Oxygen Demand (COD) and Total Organic Carbon (TOC) values were measured in biomass suspension. Within 35 days, algae absorbed about 230 g of nitrogen (over 30% by weight) and about 36 mg of phosphorus (over 90% by weight), and the OD₆₈₆ exceeded 1.2. During this time, the COD value increased by over 80% and the total organic carbon content by over 20%. The high efficiency of algae biomass production has been achieved by limiting the possibility of bacterial infection and ensuring appropriate conditions, including aeration, circulation and availability of biogenic compounds.

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