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  • 1.
    Mahboubi, Amir
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Cayli, Beray
    Department of Environmental Sciences and Engineering, Graduate School of Science, Engineering and Technology.
    Bulkan, Gülru
    University of Borås, Faculty of Textiles, Engineering and Business.
    Doyen, Wim
    Flemish Institute for Technological Research.
    De Wever, Heleen
    Flemish Institute for Technological Research.
    Taherzadeh, Mohammad J
    University of Borås, Faculty of Textiles, Engineering and Business.
    Removal of Bacterial Contamination from Bioethanol Fermentation System Using Membrane Bioreactor2018In: Fermentation, Vol. 4, no 4Article in journal (Other academic)
    Abstract [en]

    A major issue hindering efficient industrial ethanol fermentation from sugar-based feedstock is excessive unwanted bacterial contamination. In industrial scale fermentation, reaching complete sterility is costly, laborious, and difficult to sustain in long-term operation. A physical selective separation of a co-culture of Saccharomyces cerevisiae and an Enterobacter cloacae complex from a buffer solution and fermentation media at dilution rates of 0.1–1 1/h were examined using an immersed membrane bioreactor (iMBR). The effect of the presence of yeast, inoculum size, membrane pore size, and surface area, backwashing and dilution rate on bacteria removal were assessed by evaluating changes in the filtration conditions, medium turbidity, and concentration of compounds and cell biomass. The results showed that using the iMBR with dilution rate of 0.5 1/h results in successful removal of 93% of contaminating bacteria in the single culture and nearly complete bacteria decontamination in yeast-bacteria co-culture. During continuous fermentation, application of lower permeate fluxes provided a stable filtration of the mixed culture with enhanced bacteria washout. This physical selective separation of bacteria from yeast can enhance final ethanol quality and yields, process profitability, yeast metabolic activity, and decrease downstream processing costs.

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