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KMID : 0380019950100050598
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Korean Journal of Biotechnology and Bioengineering
1995 Volume.10 No. 5 p.598 ~ p.602
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Ethanol Production from Tapioca Hydrolysate by Batch and Continuous Cell Retention Cultures
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이용석/Lee, Yong Seok
이우기/박병건/장용근/장호남/Lee, Woo Gi/Park, Byung Geon/Chang, Yong Keun/Chang, Ho Nam
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Abstract
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Batch and continuous cell retention cultures were carried out using tapioca hydrolysate. In batch culture, reducing sugar of about 180g/P was almost consumed in about 36 hours, and the concentration of ethanol produced was about 84g/B making the ethanol yield 0.48 g-ethanol/g-(reducing sugar). The final yeast concentration was 8.5 x 10 cells/ml(about 2.1g/i ). In a total cell retention culture operated with a dilution rate of 0.18h-, the yeast concentration, the residual reducing sugar concentration, the ethanol concentration, and the volumetric ethanol productivity were about 40g// , about 15g/
& , 81.4g/P, and 14.7g/~ -h, respectively. In another cell retention culture operated with a dilution rate and a bleed ratio of 0.2h- and 0.14, respectively, the yeast concentration incresed to 22g// and the ethanol concentration oscillated around 68g// . The volumetric ethanol productivity was about 13.6g// -h and the residual reducing sugar concentration about 12g/h containing glucose of about 4.5g// . According to the results of batch fermentation using the solid residue from hydrolysate filtration as the substrate, it seemed to have a certain value. Thus, developement of an effective reactor system to produce ethanol from this solid residue is in need.
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