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Improvement of Photoautotrophic Algal Biomass Production after Interrupted CO2 Supply by Urea and KH2PO4 Injection

Authors
Yu, Byung SunSung, Young JoonHong, Min EuiSim, Sang Jun
Issue Date
2월-2021
Publisher
MDPI
Keywords
microalgae; photoautotrophic biomass production; urea; KH2PO4; coal-fired flue gas
Citation
ENERGIES, v.14, no.3
Indexed
SCIE
SCOPUS
Journal Title
ENERGIES
Volume
14
Number
3
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/49369
DOI
10.3390/en14030778
ISSN
1996-1073
Abstract
Microalgae-derived biomass is currently considered a sustainable feedstock for making biofuels, including biodiesel and direct combustion fuel. The photoautotrophic cultivation of microalgae using flue gas from power plants has been continuously investigated to improve the economic feasibility of microalgae processes. The utilization of waste CO2 from power plants is advantageous in reducing carbon footprints and the cost of carbon sources. Nonetheless, the sudden interruption of CO2 supply during microalgal cultivation leads to a severe reduction in biomass productivity. Herein, chemical fertilizers including urea and KH2PO4 were added to the culture medium when CO2 supply was halted. Urea (5 mM) and KH2PO4 (5 mM) were present in the culture medium in the form of CO2/NH4+ and K+/H2PO4-, respectively, preventing cell growth inhibition. The culture with urea and KH2PO4 supplementation exhibited 10.02-fold higher and 7.28-fold higher biomass and lipid productivity, respectively, compared to the culture with ambient CO2 supply due to the maintenance of a stable pH and dissolved inorganic carbon in the medium. In the mass cultivation of microalgae using flue gas from coal-fired power plants, urea and KH2PO4 were supplied while the flue gas supply was shut off. Consequently, the microalgae were grown successfully without cell death.
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공과대학 (화공생명공학과)
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