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Light-Emitting Diode Power Conversion Capability and CO2 Fixation Rate of Microalgae Biofilm Cultured Under Different Light Spectra

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School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
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Beijing Key Laboratory for Energy Saving and Emission Reduction of Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China
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Beijing Engineering Research Center of Energy Saving and Environmental Protection, University of Science and Technology Beijing, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(7), 1536; https://doi.org/10.3390/en13071536
Received: 30 January 2020 / Revised: 6 March 2020 / Accepted: 19 March 2020 / Published: 25 March 2020
(This article belongs to the Section Bio-Energy)
Microalgae biofilm-based culture has attracted much interest due to its high harvest efficiency and low energy requirements. Using light-emitting diodes (LEDs) as light source for microalgae culture has been considered as a promising choice to enhance the economic feasibility of microalgae-based commodities. In this work, the LED power conversion capability and CO2 fixation rate of microalgae biofilms (Chlorella ellipsoidea and Chlorella pyrenoidosa) cultured under different light spectra (white, blue, green and red) were studied. The results indicated that the power-to-biomass conversion capabilities of these two microalgae biofilms cultured under blue and white LEDs were much higher than those under green and red LEDs (C. ellipsoidea: 32%–33% higher, C. pyrenoidosa: 34%–46% higher), and their power-to-lipid conversion capabilities cultured under blue LEDs were 61%–66% higher than those under green LEDs. The CO2 fixation rates of these two biofilms cultured under blue LEDs were 13% and 31% higher, respectively, than those under green LEDs. The results of this study have important implications for selecting the optimal energy-efficient LEDs using in microalgae biofilm-based culture systems. View Full-Text
Keywords: microalga; biofilm-based cultivation; light spectrum; power conversion capability; CO2 fixation rate microalga; biofilm-based cultivation; light spectrum; power conversion capability; CO2 fixation rate
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MDPI and ACS Style

Yuan, H.; Wang, Y.; Xi, Y.; Jiang, Z.; Zhang, X.; Wang, X.; Zhang, X. Light-Emitting Diode Power Conversion Capability and CO2 Fixation Rate of Microalgae Biofilm Cultured Under Different Light Spectra. Energies 2020, 13, 1536.

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