Cultivation of Chlorella vulgaris as a tool to combat carbon dioxide emissions in Turkmenistan

This scientific paper presents the results of a study on the cultivation of unicellular mycoalgae Chlorella vulgaris strain IFR No. C– 111 in a tubular photobioreactor with a volume of 250 liters. In this structure, work was carried out with continuous movement of chlorella for 12 hours, feeding it with carbon dioxide, containing 0.03% (the compressor supplied from the environment) and in the second version 1.5% of the volume (supplied from a cylinder). It was found that the density of the suspension increases, after a day of observations both suspensions had the same density (1.22 g/cm3), and already starting from the second day the density of the suspension with the amount of supplied carbon dioxide is 1.5% is much higher than that of the suspension with the amount of supplied carbon dioxide 0.03% by 8.5%, on the third day 20%, on the fourth day 21.3%, on the fifth day 26.02%, on the sixth day 23.38%, on the seventh day 16.87%, as can be seen up to the fifth day of observations this difference increased rapidly, on the eighth day this difference was 14.5% respectively. It was determined that chlorella has a certain period of rapid growth, i.e. there is an intensive nutrition of carbon dioxide, in our scientific work it was equal to five days. It was found that the density of the suspension increases with the supply of carbon dioxide and their content, on the eighth day, the suspension with the amount of supplied carbon dioxide was 1.5% had a density of 1.98 g/cm3, and the suspension with the amount of supplied carbon dioxide was 0.03% was equal to 1.73 g/cm3, respectively. It was found that the selected strain is excellent (adapts) for growing in the climatic conditions of Turkmenistan, and the authors propose to use it as a tool to combat carbon dioxide emissions, given its advantages.