Improvement of photoautotrophic algal biomass production after interrupted co2 supply by urea and kh2 po4 injection

Byung Sun Yu; Young Joon Sung; Min Eui Hong; Sang Jun Sim

doi:10.3390/en14030778

Improvement of photoautotrophic algal biomass production after interrupted co₂ supply by urea and kh₂ po₄ injection

Byung Sun Yu
, Young Joon Sung
, Min Eui Hong
, Sang Jun Sim^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

Microalgae-derived biomass is currently considered a sustainable feedstock for making biofuels, including biodiesel and direct combustion fuel. The photoautotrophic cultivation of microal-gae 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 KH₂ PO₄ were added to the culture medium when CO₂ supply was halted. Urea (5 mM) and KH₂ PO₄ (5 mM) were present in the culture medium in the form of CO₂ /NH₄⁺ and K⁺ /H₂ PO₄⁻, respectively, preventing cell growth inhibition. The culture with urea and KH₂ PO₄ 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 KH₂ PO₄ were supplied while the flue gas supply was shut off. Consequently, the microalgae were grown successfully without cell death.

Original language	English
Article number	778
Journal	Energies
Volume	14
Issue number	3
DOIs	https://doi.org/10.3390/en14030778
Publication status	Published - 2021 Feb 1

Bibliographical note

Funding Information:
This work was supported by the “Carbon to X Project” (no. 2020M3H7A1098295), which was funded by the National Research Foundation (NRF) funded by the Ministry of Science and ICT, Republic of Korea, grant (no. NRF-2019R1A2C3009821/2020R1A5A1018052) from the National Research Foundation of Korea (NRF), a grant from Korea Institute of Energy Technology Evaluation and Planning (KETEP) (no. 20172010202050), and the Korea University Grant. The authors would like to thank Korea Western Power Co., Ltd. for providing the cultivation sites and facilities for this study along with their funding support. The authors also would like to thank Hong Ki Yoon for supporting the cultivation of microalgae at the coal-fired power plant (Taean, Republic of Korea).

Funding Information:
Funding: This work was supported by the “Carbon to X Project” (no. 2020M3H7A1098295), which was funded by the National Research Foundation (NRF) funded by the Ministry of Science and ICT, Republic of Korea, grant (no. NRF-2019R1A2C3009821/2020R1A5A1018052) from the National Research Foundation of Korea (NRF), a grant from Korea Institute of Energy Technology Evaluation and Planning (KETEP) (no. 20172010202050), and the Korea University Grant.

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Coal-fired flue gas
KH PO
Microalgae
Photoautotrophic biomass production
Urea

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Building and Construction
Fuel Technology
Engineering (miscellaneous)
Energy Engineering and Power Technology
Energy (miscellaneous)
Control and Optimization
Electrical and Electronic Engineering

Access to Document

10.3390/en14030778

Cite this

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title = "Improvement of photoautotrophic algal biomass production after interrupted co2 supply by urea and kh2 po4 injection",

abstract = "Microalgae-derived biomass is currently considered a sustainable feedstock for making biofuels, including biodiesel and direct combustion fuel. The photoautotrophic cultivation of microal-gae 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 KH2 PO4 were added to the culture medium when CO2 supply was halted. Urea (5 mM) and KH2 PO4 (5 mM) were present in the culture medium in the form of CO2 /NH4+ and K+ /H2 PO4−, respectively, preventing cell growth inhibition. The culture with urea and KH2 PO4 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 KH2 PO4 were supplied while the flue gas supply was shut off. Consequently, the microalgae were grown successfully without cell death.",

keywords = "Coal-fired flue gas, KH PO, Microalgae, Photoautotrophic biomass production, Urea",

author = "Yu, \{Byung Sun\} and Sung, \{Young Joon\} and Hong, \{Min Eui\} and Sim, \{Sang Jun\}",

note = "Funding Information: This work was supported by the “Carbon to X Project” (no. 2020M3H7A1098295), which was funded by the National Research Foundation (NRF) funded by the Ministry of Science and ICT, Republic of Korea, grant (no. NRF-2019R1A2C3009821/2020R1A5A1018052) from the National Research Foundation of Korea (NRF), a grant from Korea Institute of Energy Technology Evaluation and Planning (KETEP) (no. 20172010202050), and the Korea University Grant. The authors would like to thank Korea Western Power Co., Ltd. for providing the cultivation sites and facilities for this study along with their funding support. The authors also would like to thank Hong Ki Yoon for supporting the cultivation of microalgae at the coal-fired power plant (Taean, Republic of Korea). Funding Information: Funding: This work was supported by the “Carbon to X Project” (no. 2020M3H7A1098295), which was funded by the National Research Foundation (NRF) funded by the Ministry of Science and ICT, Republic of Korea, grant (no. NRF-2019R1A2C3009821/2020R1A5A1018052) from the National Research Foundation of Korea (NRF), a grant from Korea Institute of Energy Technology Evaluation and Planning (KETEP) (no. 20172010202050), and the Korea University Grant. Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",

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AU - Sung, Young Joon

AU - Hong, Min Eui

AU - Sim, Sang Jun

N1 - Funding Information: This work was supported by the “Carbon to X Project” (no. 2020M3H7A1098295), which was funded by the National Research Foundation (NRF) funded by the Ministry of Science and ICT, Republic of Korea, grant (no. NRF-2019R1A2C3009821/2020R1A5A1018052) from the National Research Foundation of Korea (NRF), a grant from Korea Institute of Energy Technology Evaluation and Planning (KETEP) (no. 20172010202050), and the Korea University Grant. The authors would like to thank Korea Western Power Co., Ltd. for providing the cultivation sites and facilities for this study along with their funding support. The authors also would like to thank Hong Ki Yoon for supporting the cultivation of microalgae at the coal-fired power plant (Taean, Republic of Korea). Funding Information: Funding: This work was supported by the “Carbon to X Project” (no. 2020M3H7A1098295), which was funded by the National Research Foundation (NRF) funded by the Ministry of Science and ICT, Republic of Korea, grant (no. NRF-2019R1A2C3009821/2020R1A5A1018052) from the National Research Foundation of Korea (NRF), a grant from Korea Institute of Energy Technology Evaluation and Planning (KETEP) (no. 20172010202050), and the Korea University Grant. Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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N2 - Microalgae-derived biomass is currently considered a sustainable feedstock for making biofuels, including biodiesel and direct combustion fuel. The photoautotrophic cultivation of microal-gae 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 KH2 PO4 were added to the culture medium when CO2 supply was halted. Urea (5 mM) and KH2 PO4 (5 mM) were present in the culture medium in the form of CO2 /NH4+ and K+ /H2 PO4−, respectively, preventing cell growth inhibition. The culture with urea and KH2 PO4 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 KH2 PO4 were supplied while the flue gas supply was shut off. Consequently, the microalgae were grown successfully without cell death.

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KW - Coal-fired flue gas

KW - KH PO

KW - Microalgae

KW - Photoautotrophic biomass production

KW - Urea

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