Production of bioethanol from organic whey using Kluyveromyces marxianus

A.D. Christensen, Zsófia Kádár, Piotr Oleskowicz-Popiel, Mette Hedegaard Thomsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Ethanol production by K. marxianus in whey from organic cheese production was examined in batch and continuous mode. The results showed that no pasteurization or freezing of the whey was necessary and that K. marxianus was able to compete with the lactic acid bacteria added during cheese production. The results also showed that, even though some lactic acid fermentation had taken place prior to ethanol fermentation, K. marxianus was able to take over and produce ethanol from the remaining lactose, since a significant amount of lactic acid was not produced (1-2 g/l). Batch fermentations showed high ethanol yield (~0.50 g ethanol/g lactose) at both 30°C and 40°C using low pH (4.5) or no pH control. Continuous fermentation of nonsterilized whey was performed using Ca-alginate-immobilized K. marxianus. High ethanol productivity (2.5-4.5 g/l/h) was achieved at dilution rate of 0.2/h, and it was concluded that K. marxianus is very suitable for industrial ethanol production from whey. © 2010 Society for Industrial Microbiology.
    Original languageEnglish
    JournalJournal of Industrial Microbiology and Biotechnology
    Volume38
    Issue number2
    Pages (from-to)283-289
    ISSN1367-5435
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Bio systems
    • Bio refinery

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