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Continuous Ethanol Production with a Membrane Bioreactor at High Acetic Acid Concentrations
University of Borås, School of Engineering.
University of Borås, School of Engineering.ORCID iD: 0000-0003-4887-2433
2014 (English)In: Membranes, ISSN 2077-0375, E-ISSN 2077-0375, Vol. 4, no 3, 372-387 p.Article in journal (Refereed) Published
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

The release of inhibitory concentrations of acetic acid from lignocellulosic raw materials during hydrolysis is one of the main concerns for 2nd generation ethanol production. The undissociated form of acetic acid can enter the cell by diffusion through the plasma membrane and trigger several toxic effects, such as uncoupling and lowered intracellular pH. The effect of acetic acid on the ethanol production was investigated in continuous cultivations by adding medium containing 2.5 to 20.0 g•L−1 acetic acid at pH 5.0, at a dilution rate of 0.5 h−1. The cultivations were performed at both high (~25 g•L−1) and very high (100–200 g•L−1) yeast concentration by retaining the yeast cells inside the reactor by a cross-flow membrane in a membrane bioreactor. The yeast was able to steadily produce ethanol from 25 g•L−1 sucrose, at volumetric rates of 5–6 g•L−1•h−1 at acetic acid concentrations up to 15.0 g•L−1. However, the yeast continued to produce ethanol also at a concentration of 20 g•L−1 acetic acid but at a declining rate. The study thereby demonstrates the great potential of the membrane bioreactor for improving the robustness of the ethanol production based on lignocellulosic raw materials.

Place, publisher, year, edition, pages
MDPI , 2014. Vol. 4, no 3, 372-387 p.
Keyword [en]
acetic acid, membrane bioreactor, bioethanol, cell retention, yeast, Resursåtervinning
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-1988DOI: 10.3390/membranes4030372PubMedID: 25028956Local ID: 2320/14535OAI: oai:DiVA.org:hb-1988DiVA: diva2:870069
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2016-09-29Bibliographically approved

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