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Continuous bioethanol fermentation from wheat straw hydrolysate with high suspended solid content using an immersed flat sheet membrane bioreactor.
University of Borås, Faculty of Textiles, Engineering and Business. Biotechnology. (Resource Recovery)
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2017 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 241, p. 296-308Article in journal (Refereed) Published
Abstract [en]

Finding a technol. approach that eases the prodn. of lignocellulosic bioethanol has long been considered as a great industrial challenge. In the current study a membrane bioreactor (MBR) set-up using integrated permeate channel (IPC) membrane panels was used to simultaneously ferment pentose and hexose sugars to ethanol in continuous fermn. of high suspended solid wheat straw hydrolyzate. The MBR was optimized to flawlessly operated at high SS concns. of up to 20% without any significant changes in the permeate flux and transmembrane pressure. By the help of the retained high cell concn., the yeast cells were capable of tolerating and detoxifying the inhibitory medium and succeeded to co-consume all glucose and up to 83% of xylose in a continuous fermn. mode leading to up to 83% of the theor. ethanol yield. [on SciFinder(R)]

Place, publisher, year, edition, pages
Elsevier Ltd. , 2017. Vol. 241, p. 296-308
Keywords [en]
Membrane bioreactor, Lignocellulose, Bioethanol, Continuous fermentation
National Category
Industrial Biotechnology
Identifiers
URN: urn:nbn:se:hb:diva-12531DOI: 10.1016/j.biortech.2017.05.125ISI: 000405502400037Scopus ID: 2-s2.0-85020039248OAI: oai:DiVA.org:hb-12531DiVA, id: diva2:1136289
Note

Copyright (C) 2017 American Chemical Society (ACS). All Rights Reserved.; CAPLUS AN 2017:885722(Journal; Online Computer File)

Available from: 2017-08-27 Created: 2017-08-27 Last updated: 2019-10-25Bibliographically approved
In thesis
1. Immersed flat-sheet membrane bioreactors for lignocellulosic bioethanol production
Open this publication in new window or tab >>Immersed flat-sheet membrane bioreactors for lignocellulosic bioethanol production
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The rising awareness of the environmental, economic and socio-political impacts of over-exploitation of fossil-based fuel and energy sources, have motivated the transition toward more sustainable and renewable energy sources. Lignocellulosic materials (e.g. agricultural residues) are potential candidates for sustainable bioethanol production that contributes to the replacement of fossil fuels. However, to have an economically feasible and commercialized process, issues associated with lignocellulosic bioethanol production in upstream, fermentation and downstream processing stages should be alleviated. Membrane bioreactors with their great capabilities in semi-selective separation are promising options for making a breakthrough in lignocellulosic biorefinery processes. Therefore, in this thesis, different membrane modules and immersed membrane bioreactors (iMBRs) set-ups were developed and applied to take advantage of this long-matured water and wastewater treatment technique in remediation of challenges in the lignocellulosic bioethanol production.

Thus, In order to intensify and optimize the lignocellulosic bioethanol production process, pressure-driven flat sheet microfiltration iMBRs were integrated into different processing stages. The application of a continuous iMBR led to a high ethanol productivity and yield (83% of theoretical yield) at high suspended solid content (up to 20% w/v) of wheat straw hydrolysate, and successful bacterial contamination separation from yeast (up to 93% removal). Moreover, using double-staged iMBRs for continuous hydrolysis-filtration and co-fermentation-filtration led to an effective separation of lignin-rich solids (up to 70% lignin) and sugar streams from the hydrolysate, and yeast cells from the fermentation product stream, stable long-term filtration performance (up to 264 h) at filtration flux of 21.9 l.m-2.h-1. In this thesis, filtration performance was thoroughly investigated, and effective physical fouling preventive approaches were applied to guarantee continuous bioprocessing. In addition, in order to remediate issues related to high content of inhibitors and presence of sequentially-fermented hexose and pentose saccharides in lignocellulosic fermentation, the cell-confinement approach of reverse membrane bioreactor (rMBR), which merges the benefits of iMBRs and cell encapsulation techniques, was introduced and applied in this thesis. It was observed that the high local cell density and diffusion-based mass transfer in the rMBR promoted co-utilization of sugars, and boosted cell furfural detoxification at concentrations of up to 16 g.l-1. Moreover, considering the needs of rMBR processes for cell recirculation, membrane envelope degassing, and media conditioning, a novel membrane module was designed, developed, and patented in this thesis work.

Place, publisher, year, edition, pages
Borås: Högskolan i Borås, 2019
Series
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 98
Keywords
Lignocellulosic bioethanol, immersed membrane bioreactor, membrane fouling, reverse membrane bioreactor
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-21668 (URN)978-91-88838-41-4 (ISBN)978-91-88838-42-1 (ISBN)
Public defence
2019-11-18, D209, University of Borås, Allégatan 1, Borås, 10:00 (English)
Opponent
Available from: 2019-10-25 Created: 2019-08-27 Last updated: 2019-10-25Bibliographically approved

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Mahboubi, AmirTaherzadeh, Mohammad J

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