The increased concentration of CO2 in the atmosphere has a strong impact on global warming. Therefore, ecient technologies must be used to reduce CO2 emissions. One of the methods is the bioxation of CO2 by microalgae and cyanobacteria. This is now a widely described technology that can improve the economics of biomass production and reduce CO2 emissions. There are no reports on the possibility of using it to clean exhaust gases from biogas combustion. The aim of the research was to determine the possibility of using Arthrospira platensis cultures to remove CO2 from biogas combustion. The eciency of biomass production and the eectiveness of biological CO2 xation were evaluated. The use of exhaust gases led to a more ecient increase in cyanobacterial biomass. The growth rate in the exponential phase was 209 ± 17 mgVS/L·day, allowing a biomass concentration of 2040 ± 49 mgVS/L. However, the use of exhaust gases led to a decrease in the pH of the culture medium and a rapid decline in the Arthrospira platensis population. The cyanobacteria eectively xed CO2, and its concentration was limited from 13 ± 1% to 1.3 ± 0.7%. There was no inuence of the exhaust gases on changes in the qualitative composition of the cyanobacterial biomass. In the culture fed with exhaust gas, the A. platensis population quickly entered the death phase, which requires close monitoring. This is an important indication for potential operators of large-scale photobioreactors.
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