| 초록 |
Syngas fermentation is well known renewable and cost effective process. In syngas fermentation process, fermentation medium accounts for a large portion of the overall price of the process and the most expensive component of the medium is yeast extract, used as nitrogen source. Therefore, to save the overall process cost, it is significant to develop low cost medium to commercialize syngas fermentation. In this study, various nitrogen sources were tested as alternative nitrogen source to replace yeast extract. The results showed higher cell growth rate and ethanol concentration in VE high medium and based on this conclusion, we preformed continuous fermentation in a 2.5 L bioreactor in YE high medium and VE high medium, respectively. In VE high medium, the maximum growth rateand ethanol production rate was 7.27% and 20.45% higher than those in YE high medium without any side effect. Vegetable extract has potential to replace yeast extract and reduce the cost in syngas fermentation. |
