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Continuous production of bioethanol using microalgal sugars extracted from Nannochloropsis gaditana

  • Ja Hyun Lee
  • Hee Uk Lee
  • Ju Hun Lee
  • Soo Kweon Lee
  • Hah Young Yoo
  • Chulhwan Park
  • Seung Wook Kim
Research papers
  • 8 Downloads

Abstract

We developed a continuous production process of bioethanol from sugars extracted from Nannochloropsis gaditana. To improve algal sugar production, the reaction conditions of acid-thermal hydrolysis were investigated based on five different types of acid and their concentrations (1-4%), and the loading ratio of solid/liquid (S/L). As a result, the maximum hydrolysis efficiency (92.82%) was achieved under 2% hydrochloric acid with 100 g/L biomass loading at 121 oC for 15 min. The hydrolysates obtained from N. gaditana were applied to the main medium of Bretthanomyces custersii H1-603 for bioethanol production. The maximum bioethanol production and yield by the microalgal hydrolysate were found to be 4.84 g/L and 0.37 g/g, respectively. In addition, the cell immobilization of B. custersii was carried out using sodium alginate, and the effect of the volume ratio of cell/sodium alginate on bioethanol productivity was investigated in a batch system. The optimal ratio was determined as 2 (v/v), and the immobilized cell beads were applied in the continuous stirred tank reactor (CSTR). Continuous ethanol production was performed using both free cells and immobilized cells at 1 L CSTR. In both groups, the maximum bioethanol production and yield were achieved at dilution rate of 0.04 h-1 (3.93 g/L and 0.3 g/g by free cell, and 3.68 g/L and 0.28 g/g by immobilized cell, respectively).

Keywords

Bioethanol CSTR Fermentation Hydrolysis Nannochloropsis gaditana 

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Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2018

Authors and Affiliations

  • Ja Hyun Lee
    • 1
  • Hee Uk Lee
    • 1
  • Ju Hun Lee
    • 1
  • Soo Kweon Lee
    • 1
  • Hah Young Yoo
    • 2
    • 3
  • Chulhwan Park
    • 2
  • Seung Wook Kim
    • 1
  1. 1.Department of Chemical and Biological EngineeringKorea UniversitySeoulKorea
  2. 2.Department of Chemical EngineeringKwangwoon UniversitySeoulKorea
  3. 3.Department of BiotechnologySangmyung UniversitySeoulKorea

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