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Refining bioethanol from stalk juice of sweet sorghum by immobilized yeast fermentation

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  • Liu, Ronghou
  • Li, Jinxia
  • Shen, Fei

Abstract

The relationship between total soluble sugar content and Brix in stalk juice of sweet sorghum was determined through one-dimensional linear regression. Meanwhile, bioethanol fermentation experiments were conducted in shaking flasks and 10l fluidized bed bioreactor with stalk juice of Yuantian No. 1 sweet sorghum cultivar when immobilized yeast was applied. The experimental results in the shaking flasks showed that the order of influence on improving ethanol yield was (NH4)2SO4>MgSO4>K2HPO4, and the optimum inorganic salts supplement dose was determined as follows: K2HPO4 0%, (NH4)2SO4 0.2%, MgSO4 0.05%. When the optimum inorganic salts supplement dose was used in fermentation in 10l fluidized bed reactor, the fermentation time and ethanol content were 5h and 6.2% (v/v), respectively, and ethanol yield was 91.61%, which was increased by 9.73% than blank. In addition, the results showed that the fermentation time was about 6–8 times shorter in fluidized bed bioreactor with immobilized yeast than that of conventional fermentation technology. As a result, it can be concluded that the determined optimum inorganic salts supplement dose could be used as a guide for commercial ethanol production. The fluidized bed bioreactor with immobilized yeast technology has a great potential for ethanol fermentation of stalk juice of sweet sorghum.

Suggested Citation

  • Liu, Ronghou & Li, Jinxia & Shen, Fei, 2008. "Refining bioethanol from stalk juice of sweet sorghum by immobilized yeast fermentation," Renewable Energy, Elsevier, vol. 33(5), pages 1130-1135.
    • Handle: RePEc:eee:renene:v:33:y:2008:i:5:p:1130-1135
    DOI: 10.1016/j.renene.2007.05.046
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    References listed on IDEAS

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    1. Zhang, Cheng & Han, Weijian & Jing, Xuedong & Pu, Gengqiang & Wang, Chengtao, 2003. "Life cycle economic analysis of fuel ethanol derived from cassava in southwest China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 7(4), pages 353-366, August.
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    1. Mishra, Abhishek & Sharma, Ajay K. & Sharma, Sumit & Bagai, Rashmi & Mathur, Anshu S. & Gupta, Ravi P. & Tuli, Deepak K., 2016. "Lignocellulosic ethanol production employing immobilized Saccharomyces cerevisiae in packed bed reactor," Renewable Energy, Elsevier, vol. 98(C), pages 57-63.
    2. Divya Joslin Mathias & Thiago Edwiges & Napong Ketsub & Rajinder Singh & Prasad Kaparaju, 2023. "Sweet Sorghum as a Potential Fallow Crop in Sugarcane Farming for Biomethane Production in Queensland, Australia," Energies, MDPI, vol. 16(18), pages 1-17, September.
    3. Ahmad Dar, Rouf & Ahmad Dar, Eajaz & Kaur, Ajit & Gupta Phutela, Urmila, 2018. "Sweet sorghum-a promising alternative feedstock for biofuel production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 4070-4090.
    4. Tian, Shuang-Qi & Wang, Xin-Wei & Zhao, Ren-Yong & Ma, Sen, 2016. "Effect of doping pretreated corn stover conditions on yield of bioethanol in immobilized cell systems," Renewable Energy, Elsevier, vol. 86(C), pages 858-865.
    5. Orawan Deesuth & Pattana Laopaiboon & Prasit Jaisil & Lakkana Laopaiboon, 2012. "Optimization of Nitrogen and Metal Ions Supplementation for Very High Gravity Bioethanol Fermentation from Sweet Sorghum Juice Using an Orthogonal Array Design," Energies, MDPI, vol. 5(9), pages 1-20, August.

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