The kinetics of cell growth and photohydrogen evolution of P. subcordiformis grown under CO2-supplemented air bubble bioreactor is investigated. The highest cell growth was achieved as φ(CO2) got to 3%, and was supplemented to the air, with a specific growth rate of 0.134 d-1. The hydrogen photoproduction was enhanced by 70% for cells grown under 3% of φ(CO2), with a specific hydrogen production rate of 3.24 mmol/(g·h)-1. The metabolic analysis of algal cells indicated a significant increase in starch accumulation with the increasing CO2 concentrations. The highest starch content was achieved under 3% of φ(CO2) supplemented alga cells, 2.1 times the control culture in air. The improved hydrogen production may correlate with the increased starch accumulation where CO2 serves as the sole carbon source. These results suggest that hydrogen photoproduction by marine green alga can be beneficial from CO2-supplemented cultivation, which exerts a positive impact on the greenhouse gas mitigation.
|Number of pages||5|
|Journal||Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University|
|Publication status||Published - 1 Jun 2008|
- Photobiological hydrogen production
- Platymonas subcordiformis