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[Continuous ethanol fermentation coupled with recycling of yeast flocs].
Sheng Wu Gong Cheng Xue Bao. 2006 Sep; 22(5):816-20.SW

Abstract

A continuous ethanol fermentation system composed of three-stage tanks in series coupled with two sedimentation tanks was established. A self-flocculating yeast strain developed by protoplast fusion from Saccharomyces cerevisiae and Schizosaccharomyces pombe was applied. Two-stage enzymatic hydrolysate of corn powder containing 220g/L of reducing sugar, supplemented with 1.5g/L (NH4)2HPO4 and 2.5g/L KH2PO4, was used as the ethanol fermentation substrate and fed into the first fermentor at the dilution rate of 0.057h(-1). The yeast flocs separated by sedimentation were recycled into the first fermentor as two different models: activation-recycle and direct recycle. The quasi-steady states were obtained for both operation models after the fermentation systems experienced short periods of transitions. Activation process helped enhance the performance of ethanol fermentation at the high dilution rates. The broth containing more than 101g/L ethanol, 3.2g/L residual reducing sugar and 7.7g/L residual total sugar was produced. The ethanol productivity was calculated to be 5.77g/(L x h), which increased by more than 70% compared with that achieved in the same tank in series system without recycling of yeast cells.

Authors+Show Affiliations

Department of Bioscience and Bioengineering, Dalian University of Technology, China.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

chi

PubMed ID

17037208

Citation

Wang, Bo, et al. "[Continuous Ethanol Fermentation Coupled With Recycling of Yeast Flocs]." Sheng Wu Gong Cheng Xue Bao = Chinese Journal of Biotechnology, vol. 22, no. 5, 2006, pp. 816-20.
Wang B, Ge XM, Li N, et al. [Continuous ethanol fermentation coupled with recycling of yeast flocs]. Sheng Wu Gong Cheng Xue Bao. 2006;22(5):816-20.
Wang, B., Ge, X. M., Li, N., & Bai, F. W. (2006). [Continuous ethanol fermentation coupled with recycling of yeast flocs]. Sheng Wu Gong Cheng Xue Bao = Chinese Journal of Biotechnology, 22(5), 816-20.
Wang B, et al. [Continuous Ethanol Fermentation Coupled With Recycling of Yeast Flocs]. Sheng Wu Gong Cheng Xue Bao. 2006;22(5):816-20. PubMed PMID: 17037208.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [Continuous ethanol fermentation coupled with recycling of yeast flocs]. AU - Wang,Bo, AU - Ge,Xu-Meng, AU - Li,Ning, AU - Bai,Feng-Wu, PY - 2006/10/14/pubmed PY - 2010/4/30/medline PY - 2006/10/14/entrez SP - 816 EP - 20 JF - Sheng wu gong cheng xue bao = Chinese journal of biotechnology JO - Sheng Wu Gong Cheng Xue Bao VL - 22 IS - 5 N2 - A continuous ethanol fermentation system composed of three-stage tanks in series coupled with two sedimentation tanks was established. A self-flocculating yeast strain developed by protoplast fusion from Saccharomyces cerevisiae and Schizosaccharomyces pombe was applied. Two-stage enzymatic hydrolysate of corn powder containing 220g/L of reducing sugar, supplemented with 1.5g/L (NH4)2HPO4 and 2.5g/L KH2PO4, was used as the ethanol fermentation substrate and fed into the first fermentor at the dilution rate of 0.057h(-1). The yeast flocs separated by sedimentation were recycled into the first fermentor as two different models: activation-recycle and direct recycle. The quasi-steady states were obtained for both operation models after the fermentation systems experienced short periods of transitions. Activation process helped enhance the performance of ethanol fermentation at the high dilution rates. The broth containing more than 101g/L ethanol, 3.2g/L residual reducing sugar and 7.7g/L residual total sugar was produced. The ethanol productivity was calculated to be 5.77g/(L x h), which increased by more than 70% compared with that achieved in the same tank in series system without recycling of yeast cells. SN - 1000-3061 UR - https://www.unboundmedicine.com/medline/citation/17037208/[Continuous_ethanol_fermentation_coupled_with_recycling_of_yeast_flocs]_ L2 - https://doi.org/10.1016/s1872-2075(06)60059-9 DB - PRIME DP - Unbound Medicine ER -
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