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Sustained photobiological hydrogen production by Chlorella vulgaris without nutrient starvation
Ist Teil von
International journal of hydrogen energy, 2021-01, Vol.46 (5), p.3684-3694
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2021
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
This article describes the ability of the Chlorella vulgaris BEIJ strain G-120 to produce hydrogen (H2) via both direct and indirect pathways without the use of nutrient starvation. Photobiological H2 production reached a maximum rate of 12 mL H2 L−1 h−1, corresponding to a light conversion efficiency (light to H2) 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 H2 μgChl−1 h−1 and the calculated in vitro hydrogenase activity was 830 ± 61 nmoles H2 μgChl−1 h−1. The strain is able to grow either heterotrophically or photo autotrophically. The total output of 896 mL of H2 was attained for illuminated culture and 405 mL for dark cultures. The average H2 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.
•Chlorella produced H2 by direct photosynthesis without applying sulfur-starvation.•Chlorella G-120 strain can release H2 both in the light and in the dark.•Chlorella G-120 strain can be grown both autotrophically and heterotrophically.•Photobiological H2 production by strain G-120 reached 7.7% efficiency (H2 to light).•Photosynthetic rate of Chlorella G-120 surpassed that of C. reinhardtii CC-124.