Fermentation of cheese whey powder solution to ethanol in a packed-column bioreactor: effects of feed sugar concentration

ÖZMIHÇI S., Kargi F.

JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY, vol.84, no.1, pp.106-111, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 84 Issue: 1
  • Publication Date: 2009
  • Doi Number: 10.1002/jctb.2013
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.106-111
  • Keywords: cheese whey powder (CWP), ethanol fermentation, feed sugar content, K. marxianus, packed-column bioreactor (PCBR), KLUYVEROMYCES-MARXIANUS IMB3, REPEATED FED-BATCH, YEAST-STRAIN, PERMEATE, THERMOTOLERANT, 45-DEGREES-C, ALCOHOL, GROWTH, CWP
  • Dokuz Eylül University Affiliated: Yes


BACKGROUND: Cheese whey powder (CWP) is a concentrated source of lactose and other essential nutrients for ethanol fermentation. CWP solution containing different concentrations of total sugar was fermented to ethanol in an up-flow packed-column bioreactor (PCBR) at a constant hydraulic residence time (HRT) of 50 h. Total sugar concentration in the feed was varied between 50 and 200 g L-1 and a pure culture of Kluyveromyces marxianus was used for ethanol fermentation of lactose. Variations of ethanol and sugar concentrations with the height of the column and with the feed sugar concentration were determined.