Carbon Dioxide Utilization Using Chlorella Microalgae

Abstract

The problem of the excessive CO2 emitted into the atmosphere is one of the significant problems for the modern world and ecology. This article examines the dynamics of carbon dioxide absorption from thermal power plants, TPP, and waste gases by three types of microalgae, the most typical for the Russian Federation: Chlorella kessleri, Chlorella vulgaris, and Chlorella sorokiniana. The exhaust gases of the TPP contain up to 39% carbon dioxide. In this work, the rate of absorption of carbon dioxide from model exhaust gases with a CO2 content of up to 39% was studied. As a result of the study, a species of microalgae (Chlorella vulgaris) was identified, characterized by the maximum rate of absorption of CO2 = 0.412 g/L·day and the maximum volume of CO2 utilized in 1 day = 8.125 L. The conducted research proved the possibility of utilizing a large content (up to 39%) of carbon dioxide from the exhaust gases of the TPP with the help of microalgae of the genus Chlorella. A scheme for the utilization of CO2 with the help of microalgae is also proposed, which meets the principles of a circular economy (closed cycle).

Production of Biohydrogen from Microalgae Biomass after Wastewater Treatment and Air Purification from CO2

“…The main results of the study of carbon dioxide absorption are presented by the authors in [59]. In total, 50 L of Chlorella kessleri microalgae suspension absorbs 15.5 L of CO 2 in an average of 3 days.…”

“…CO2 was added daily through aerators in a volum of 7.5-17.5 L (15-39%) of the unoccupied volume of PhBR-B. Intensive bubbling with gase with a high content of CO2 (15-39%) of the suspension of Chlorella microalgae makes i possible to intensify the processes of the absorption of CO2 by the biomass of microalgae CO2 from gaseous emissions is not only a source of inorganic carbon for microalgae bu also promotes the more rapid reproduction of microalgae cells and maintains the required pH of the solution in the range of 6.0 to 9.0 [59]. Thus, the microalgae cultivation proces can be considered not only as a water purification process but also as an air purification process, which helps to reduce the carbon footprint.…”

Regional resource evaluation and distribution for onshore carbon dioxide storage and utilization in Uzbekistan

“…Applying the reaction below, plants and photosynthetic microorganisms, including microalgae and cyanobacteria, transform CO2 into organic feedstock with the assistance of light energy. Simultaneously, they release molecular oxygen, as depicted (Politaeva et al, 2023;Xing, 2015) (R5):…”

“…Therefore, as a rough initial estimation, literature data is used with the following considerations (Bai et al, 2017;Ghorbani et al, 2014;Li et al, 2022;LTD. ), n.d.; Pavlik et al, 2017;Politaeva et al, 2023):…”