Effects of two types of inorganic carbon sources on the growth of Pinguiococcus pyrenoidosus CCMP 2078 were investigated in this study. The results showed that the growth of P.pyrenoidosus CCMP 2078 was significantly promoted by adding appropriate amount of NaHCO3 or CO2, and there were significant differences among different additions of NaHCO3. The optimal concentrations of NaHCO3 added for one time and added equally for several times were 5 mmoL·L-1 and 20 mmoL·L-1, respectively. For the latter treatment, parameters of cell density, dry weight, and the specific growth rate reached to the highest value, which were 8.93×106cells·mL-1, 0.247 g·L-1, and 0.225 d-1, respectively. When CO2 content was 0.5%, P. pyrenoidosus CCMP 2078 reached to the highest growth rate, and parameters of cell density, dry weight, and the specific growth rate were 3.83×107cells·mL-1, 0.42 g·L-1, and 0.212 d-1, respectively.
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