Abstract
AbstractThe photosynthetic activity of a continuous culture of the microalga Chlorella vulgaris as it is influenced by the CO2 concentration in the aerating air at different light levels is discussed. It is shown that the characteristic of this behavior is mainly determined by the CO2 transport from the air to the algal cell. Therefore the critical CO2 concentration necessary for optimal growth of a particular alga cannot be given in general, as it differs over a very wide range depending on the dispersion system used in the culture vessel. By analyzing experimental data by means of a mathematical model the overall transport coefficient in a well stirred system for the CO2 transport from the air bubble to the algal cell and the “actual” CO2 kinetics, can be calculated within reasonable limits of accuracy.
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