Efficient hydrogen photoproduction by synchronously grown cells of a marine cyanobacterium, Synechococcus sp. Miami BG 043511, under high cell density conditions
- Univ. of Miami, FL (United States). School of Marine and Atmospheric Science
The capability of hydrogen photoproduction under high cell density conditions was examined using synchronously grown cells of nitrogen-fixing Synechococcus sp. Miami BG 043511. Optimum hydrogen yield was obtained when vessels contained 0.2 to 0.3 mg chlorophyll a in 3-mL cell suspension. During a 24-h incubation period, an initial phase of hydrogen and carbon dioxide production and a subsequent phase of carbon dioxide uptake and oxygen production were observed; hence, hydrogen and oxygen accumulated as major products after 24 h. After the initial 24-h incubation, as high as 7.4 and 3.7 mL of hydrogen and oxygen, respectively, accumulated in vessels with 22-mL gas phase. This indicated that the pressure in the flask increased to 1.5 atmosphere. Energy conversion efficiency based on photosynthetically active radiation (25) (W/m[sup 2]) was about 2.6%. However, increased pressure somehow reduced the duration of hydrogen production. Duration of hydrogen and oxygen production was prolonged by periodical gas replacement during incubation.
- OSTI ID:
- 6945834
- Journal Information:
- Biotechnology and Bioengineering; (United States), Vol. 44:7; ISSN 0006-3592
- Country of Publication:
- United States
- Language:
- English
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