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Biotechnology Letters

, Volume 16, Issue 2, pp 205–210 | Cite as

Ethanol production from concentrated whey permeate using a fed-batch culture ofKluyveromyces fragilis

  • Mario Daniel Ferrari
  • Lilián Loperena
  • Hermosinda Varela
Article

Summary

Fed-batch fermentation of non-supplemented concentrated whey permeate resulted in high ethanol productivity for feeds of lactose for which batch fermentation had a poor performance. At an initial lactose concentration of 100 g/L and a constant lactose feeding rate of 18 g/h we have obtained: ethanol concentration 64 g/L, ethanol productivity 3.3 g/Lh, lactose consumption 100%, ethanol yield 0.47 g/g, and biomass yield 0.058 g/g.

Keywords

Biomass Fermentation Organic Chemistry Lactose Bioorganic Chemistry 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Nomenclature

St

total lactose fed per medium volume in the bioreactor, g/L

Si

initial lactose concentration, g/L

F

lactpse feeding rate, g/h

P

final ethanol concentration, g/L

Yp/s

ethanol yield, g ethanol/g lactose

Yx/s

biomass yield, g biomass/g lactose

XS

lactose consumption, %

Qp

overall ethanol volumetric productivity, g/Lh

μm

maximum specific growth rate, h

qsm

maximum specific lactose consumption rate, g/gh

qpm

maximum specific ethanol production rate, g/gh

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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Mario Daniel Ferrari
    • 1
  • Lilián Loperena
    • 1
  • Hermosinda Varela
    • 1
  1. 1.Depto. Bioingeniería, Instituto de Ingeniería Química Facultad de IngenieríaUniversidad de la RepúblicaMonievideoURUGUAY

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