Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 5, Pages 3684-3694Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.10.257
Keywords
Photobiological hydrogen production; Chlorella; Light conversion efficiency; Photobioreactor; Dark hydrogen production; Microalgae
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Funding
- Vicerrectoria de Investigacion, University of Costa Rica [C0107]
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This article discusses the ability of Chlorella vulgaris BEIJ strain G-120 to produce hydrogen through direct and indirect pathways without nutrient starvation. The strain showed high hydrogen production efficiency and can grow heterotrophically or photo autotrophically.
This article describes the ability of the Chlorella vulgaris BEIJ strain G-120 to produce hydrogen (H-2) via both direct and indirect pathways without the use of nutrient starvation. Photobiological H-2 production reached a maximum rate of 12 mL H-2 L(-1 )h(-1), corresponding to a light conversion efficiency (light to H-2) of 7.7% (average 3.2%, over the 8-day period) of PAR, (photosynthetically active irradiance). Cells presented a maximum in vivo hydrogenase activity of 25.5 +/- 0.2 nmoles H-2 mu gChl(-1) h(-1) and the calculated in vitro hydrogenase activity was 830 +/- 61 nmoles H-2 mu gChl(-1) h(-1). The strain is able to grow either heterotrophically or photo autotrophically. The total output of 896 mL of H-2 was attained for illuminated culture and 405 mL for dark cultures. The average H-2 production rate was 4.98 mL L-1 h(-1) for the illuminated culture and 2.08 mL L-1 h(-)(1) for the one maintained in the dark. (C) 2020 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
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