초록
<P>Although the usage of microalgae biomass as a feedstock for bioethanol production has been extensively studied, very little attention has been given to the usage of cyanobacterial biomass for bioethanol production. In this study, a thermophilic cyanobacterial strain namely <I>Phormidium</I> sp. was used for producing bioethanol. Some important parameters for bioethanol production were optimized. When the initial sugar concentration was 8.69 at 40 g L<SUP>−1</SUP> cyanobacteria loading, <I>Pichia stipitis</I> used 31.5% of the sugar and produced 1.64 g L<SUP>−1</SUP> ethanol and <I>Saccharomyces cerevisiae</I> used 34.6% of the sugar and produced 1.97 g L<SUP>−1</SUP> ethanol at the end of 72 h. The highest bioethanol concentration was obtained as 2.32 g L<SUP>−1</SUP> for <I>S. cerevisiae</I> and 1.7 g L<SUP>−1</SUP> for <I>P. stipitis</I> at 24 h of incubation time and substrate concentration of 40 g L<SUP>−1</SUP> cyanobacterial biomass at pH 5. This study demonstrated that the biomass of a thermophilic cyanobacteria is a promising feedstock for bioethanol production. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 903–907, 2015</P>