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Use of Membrane Bioreactor to Bioethanol Production from Lignocellulosic Material

Ebrahimi, Mohammad Hassan | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44979 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Soltanieh, Mohammad; Goodarznia, Iraj
  7. Abstract:
  8. In this study production of bioethanol from corn fiber that is a lignocellulosic material is investigated. Experiments were performed in a membrane bioreactor. Bioethanol is a second generation biofuel that is considered recently because of the decrease in oil production and pollutions caused by fossil fuels.The feed was corn fiber which is considered suitable due to its low cost and availability in my country. Corn fiber is composed of cellulose, hemicellulose and lignin. We should increase cellulose fraction by pretreatment methods to get a higher conversion rate into bioethanol. We did this by acid pretreatment and the fraction was reached to 41%. In most of previous work experiments were performed in batch systems but we did this study in fed-batch ones and perform the process of simultaneous Saccharification and fermentation (SSF) by using ultrafiltration membrane and removing of products. We used strain of saccharomyces cerevisiae as yeast. In fact the most important matter in this study is fed-batch processes and the low cost of substrate. The continuous systems advantages are refusing inhibitory effects and enzymes deactivation. Design and optimization of the experiments were performed with Design-Expert and we investigated temperature, surfactant concentration and agitation reaching the maximum ethanol yield. In each experiment, the permeate were measured every 4 hours and the concentration of ethanol and glucose were determined using HPLC. The data were then given to software and the optimum conditions are as the following: Temperature (38.5°c), agitation(631.2rpm) and surfactant concentration (0.08%v/v). At this condition the predicted ethanol yield was 87.8% and the actual experimental value was 84.2%
  9. Keywords:
  10. Bioethanol ; Corn Fiber ; Membrane Bioreactor ; Saccharomyces Cerevisiae ; Ultrafiltration ; Simultaneous Saccharification and Fermentation (SSF)

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