Hydrogen production by photosynthetic microorganisms
- 120 Downloads
Photosynthetic starch accumulation in green microalgae (400 L x2);
Dark anaerobic fermentation of the algal starch biomass to produce hydrogen and organic compounds (155 L x2); and
Further conversion of the organic compounds to produce hydrogen using photosynthetic bacteria (three types of reactors, parallel plate, raceway, and tubular).
We constructed a test plant of this process at Nankoh power plant of Kansai Electric Power Company in Osaka, Japan, and carried out a series of tests using CO2 obtained from a chemical absorption pilot-plant. The photobiological hydrogen production process used a combination of a marine alga,Chlamydomonas sp. MGA 161 and marine photosynthetic bacterium,Rhodopseudomonas sp. W-1S. The dark anaerobic fermentation of algal starch biomass was also investigated. Sustained and stable starch accumulation, starch degradation in the algal cell, and hydrogen production from algal fermentation and photosynthetic bacteria in the light were demonstrated during several experiments.