Biotechnology Letters

, Volume 5, Issue 1, pp 19–24 | Cite as

High productivity continuous ethanol fermentation with a flocculating mutant strain of Zymomonas mobilis

  • Jared E. Fein
  • Hugh G. Lawford
  • G. Ross Lawford
  • Bogdan C. Zawadzki
  • Robert C. Charley
Article

Abstract

High fermenter (volumetric) ethanol productivities (⩾80 g/lh−1) were attained in a simple single-stage continuous-stirred-tank-reactor (CSTR) employing a flocculent mutant of Zymomonas mobilis with a feed containing 100g/l glucose. Under these conditions a final ethanol concentration of 47.6 g/l was obtained, representing a maximum conversion efficiency of 97% of theoretical.

Nomenclature

SR = Medium glucose concentration (g/l)

X

Biomass concentration (g/l)

P

Ethanol concentration (g/l)

VP

Volumetric productivity (g ethanol/l/h)

Yp/s

Product yield coefficient (g ethanol/g glucose consumed)

Qp

Specific rate of ethanol formation (g ethanol/g cells/h)

D

Dilution rate (h−1)

Dmax

Maximum dilution rate: ie., highest dilution rate at which the effluent glucose concentration ⩽ 4g/l (h−1)

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References

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Copyright information

© Chapman & Hall 1983

Authors and Affiliations

  • Jared E. Fein
    • 1
  • Hugh G. Lawford
    • 2
    • 1
  • G. Ross Lawford
    • 2
  • Bogdan C. Zawadzki
    • 1
  • Robert C. Charley
    • 1
  1. 1.Weston Research CentreTorontoCanada
  2. 2.Department of BiochemistryUniversity of TorontoTorontoCanada

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