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  • 1.
    Ylitervo, Päivi
    et al.
    University of Borås, School of Engineering.
    Akinbomi, J.
    University of Borås, School of Engineering.
    Taherzadeh, M.J.
    University of Borås, School of Engineering.
    Membrane bioreactors’ potential for ethanol and biogas production: A review2013In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 34, no 13-14, p. 1711-1723Article in journal (Refereed)
    Abstract [en]

    Companies developing and producing membranes for different separation purposes, as well as the market for these, have markedly increased in numbers over the last decade. Membrane and separation technology might well contribute to making fuel ethanol and biogas production from lignocellulosic materials more economically viable and productive. Combining biological processes with membrane separation techniques in a membrane bioreactor (MBR) increases cell concentrations extensively in the bioreactor. Such a combination furthermore reduces product inhibition during the biological process, increases product concentration and productivity, and simplifies the separation of product and/or cells. Various MBRs have been studied over the years, where the membrane is either submerged inside the liquid to be filtered, or placed in an external loop outside the bioreactor. All configurations have advantages and drawbacks, as reviewed in this paper. The current review presents an account of the membrane separation technologies, and the research performed on MBRs, focusing on ethanol and biogas production. The advantages and potentials of the technology are elucidated.

  • 2.
    Youngsukkasem, S.
    et al.
    University of Borås, School of Engineering.
    Akinbomi, J.
    University of Borås, School of Engineering.
    Rakshit, S.K.
    Taherzadeh, M.J.
    University of Borås, School of Engineering.
    Biogas production by encased bacteria in synthetic membranes: Protective effects in toxic media and high loading rates2013In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 34, no 13-14, p. 2077-2084Article in journal (Refereed)
    Abstract [en]

    A bioreactor including encased digesting bacteria for biogas production was developed, and its performance in toxic media and under high organic loading rates (OLRs) was examined and compared with traditional digestion reactors. The bacteria (3 g) were encased and sealed in 3 × 6cm 2 PVDF (polyvinylidene fluoride) membranes with a pore size of 0.1 μ m, and then several sachets were placed in the reactors. They were then examined in toxic medium containing up to 3% limonene as a model inhibitor in batch reactors, and OLRs of up to 20 g COD / L.day in semi-continuous digestions. The free and encased cells with an identical total bacterial concentration of 9 g in a medium containing 2% limonene produced at most 6.56 and 23.06 mL biogas per day, respectively. In addition, the digestion with free cells completely failed at an OLR of 7.5 g COD / L.day, while the encased cells were still fully active with a loading of 15 g COD / L.day.

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