The Behavior of a CO2 Fixation Process by Euglena Gracilis Z with a Photobioreactor
2000
Shin Hang-Sik | Chae So-Ryong KAIST, Taejon (Korea Republic)
Biological fixation of carbon dioxide using microalgae is known as an effective CO2 reduction technology. However, many environmental factors influence microalgal productivity. Optimal cultivation factors were determined for the green alga. Euglena gracilis Z, which offers high protein and vitamin E content for animal fodder. In batch culture in a photobioreactor, it was found that the initial pH, temperature, CO2 concentration in air, and light intensity during the optimal cultivating conditions were 3.5, 27 degrees, 5-10% and 520 micro mol/m sq/s, respectively. When tap water and freshwater were used as cultivating media unsterilized tap water was found to be effective. A kinetic model was considered to determine the relationship between the specific growth rate and the light intensity. The half-velocity coefficient (K) in the Monod model under photoautotrophic conditions was 978.9 micro mol/m sq/s.
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