Comparative Evaluation of CO 2 Fixation of Microalgae Strains at Various CO 2 Aeration Conditions
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ORIGINAL PAPER
Comparative Evaluation of CO2 Fixation of Microalgae Strains at Various CO2 Aeration Conditions Jungsu Park1 · Gopalakrishnan Kumar1,2 · Péter Bakonyi3 · Jakub Peter4 · Nándor Nemestóthy3 · Stanislaw Koter5 · Wojciech Kujawski5 · Katalin Bélafi‑Bakó3 · Zbynek Pientka4 · Raul Muñoz6 · Sang‑Hyoun Kim1 Received: 16 April 2020 / Accepted: 3 September 2020 © Springer Nature B.V. 2020
Abstract This study investigated microalgal C O2 fixation at the C O2 concentration ranging from 5 to 40% and the C O2 loading rate of 14.4 to 57.6 L/L-d. Chlorella sp. (AG10133) was selected as the optimal strain for CO2 fixation among examined algal strains. The microalgal CO2 fixation was highly dependent on the CO2 loading rate as well as CO2 concentration. In batch culture, the highest C O2 fixation rate of 1.785 g/L-d was obtained at the C O2 concentration and the C O2 loading rate of 15% and 43.2 L/L-d, respectively. The high CO2 fixation performance was maintained at CO2 40% with the same CO2 loading rate. On the other hand, C O2 loading rate over 43.2 L/L-d at C O2 15% deteriorated C O2 fixation along with the decrease of microalgal growth. In continuous culture, the CO2 fixation rate of 2.25 g/L-d was achieved at the pseudo-steady state. The microalgal CO2 fixation would be suitable for high-strength CO2 gas stream such as biogas by providing proper CO2 loading rate. Graphic Abstract
Keywords CO2 fixation · CO2 loading rate · Chlorella sp. · Continuous culture Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12649-020-01226-8) contains supplementary material, which is available to authorized users.
Statement of Novelty
* Sang‑Hyoun Kim [email protected]
This study aimed to investigate the feasibility of biological CO2 fixation of microalgae for CO2 gas stream at high concentration such as biogas. Microalgae are suitable for
Extended author information available on the last page of the article
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upgrading biogas technology. The rate of CO2 fixation of microalgae is affected by several factors and this study was conducted to determine optimal conditions for CO2 fixation. Optimal conditions, including the strain of microalgae C O2 concentrations, and CO2 loading rate were investigated in relation to maximizing C O2 fixation. Under conditions of excess CO2 concentration during aeration, microalgae can be inhibited. Especially, in this study, Authors found that this inhibition can be ameliorated by changing the C O2 loading rate through control of the flow rate.
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