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Immersed flat-sheet membrane bioreactors for lignocellulosic bioethanol production
University of Borås, Faculty of Textiles, Engineering and Business.
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Sustainable development
According to the author(s), the content of this publication falls within the area of sustainable development.
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 [en]
Lignocellulosic bioethanol, immersed membrane bioreactor, membrane fouling, reverse membrane bioreactor
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-21668ISBN: 978-91-88838-41-4 (print)ISBN: 978-91-88838-42-1 (electronic)OAI: oai:DiVA.org:hb-21668DiVA, id: diva2:1346352
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
List of papers
1. Continuous bioethanol fermentation from wheat straw hydrolysate with high suspended solid content using an immersed flat sheet membrane bioreactor.
Open this publication in new window or tab >>Continuous bioethanol fermentation from wheat straw hydrolysate with high suspended solid content using an immersed flat sheet membrane bioreactor.
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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
Keywords
Membrane bioreactor, Lignocellulose, Bioethanol, Continuous fermentation
National Category
Industrial Biotechnology
Identifiers
urn:nbn:se:hb:diva-12531 (URN)10.1016/j.biortech.2017.05.125 (DOI)000405502400037 ()2-s2.0-85020039248 (Scopus ID)
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
2. Removal of Bacterial Contamination from Bioethanol Fermentation System Using Membrane Bioreactor
Open this publication in new window or tab >>Removal of Bacterial Contamination from Bioethanol Fermentation System Using Membrane Bioreactor
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2018 (English)In: Fermentation, Vol. 4, no 4Article in journal (Other academic) Published
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.

Keywords
membrane bioreactor, filtration, bacterial decontamination, fermentation
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-15222 (URN)10.3390/fermentation4040088 (DOI)
Available from: 2018-10-31 Created: 2018-10-31 Last updated: 2019-10-25Bibliographically approved
3. Reverse membrane bioreactor: Introduction to a new technology for biofuel production
Open this publication in new window or tab >>Reverse membrane bioreactor: Introduction to a new technology for biofuel production
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2016 (English)In: Biotechnology Advances, ISSN 0734-9750, E-ISSN 1873-1899, Vol. 34, no 5, p. 954-75Article in journal (Refereed) Published
Abstract [en]

The novel concept of reverse membrane bioreactors (rMBR) introduced in this review is a new membrane-assisted cell retention technique benefiting from the advantageous properties of both conventional MBRs and cell encapsulation techniques to tackle issues in bioconversion and fermentation of complex feeds. The rMBR applies high local cell density and membrane separation of cell/feed to the conventional immersed membrane bioreactor (iMBR) set up. Moreover, this new membrane configuration functions on basis of concentration-driven diffusion rather than pressure-driven convection previously used in conventional MBRs. These new features bring along the exceptional ability of rMBRs in aiding complex bioconversion and fermentation feeds containing high concentrations of inhibitory compounds, a variety of sugar sources and high suspended solid content. In the current review, the similarities and differences between the rMBR and conventional MBRs and cell encapsulation regarding advantages, disadvantages, principles and applications for biofuel production are presented and compared. Moreover, the potential of rMBRs in bioconversion of specific complex substrates of interest such as lignocellulosic hydrolysate is thoroughly studied.[on SciFinder (R)]

Keywords
bioconversion, biofilm, diffusion, fouling, inhibitory compounds, membrane bioreactor, reverse membrane bioreactor, suspended solid
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-10778 (URN)10.1016/j.biotechadv.2016.05.009 (DOI)000380600200032 ()27238291 (PubMedID)2-s2.0-84973103296 (Scopus ID)
Note

MEDLINE AN 2017046188(Journal; Article; (JOURNAL ARTICLE); General Review; (REVIEW))

Available from: 2016-09-27 Created: 2016-09-27 Last updated: 2019-10-25Bibliographically approved
4. Diffusion-based reverse membrane bioreactor for simultaneous bioconversion of high-inhibitor xylose-glucose media
Open this publication in new window or tab >>Diffusion-based reverse membrane bioreactor for simultaneous bioconversion of high-inhibitor xylose-glucose media
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2018 (English)In: Process Biochemistry, ISSN 1359-5113, E-ISSN 1873-3298, Vol. 72, p. 23-30Article in journal (Refereed) Published
Keywords
Reverse membrane bioreactor, Concentration gradient, Diffusion rate, Fermentation, Inhibitor detoxification
National Category
Industrial Biotechnology
Identifiers
urn:nbn:se:hb:diva-15219 (URN)10.1016/j.procbio.2018.06.007 (DOI)000442710600003 ()2-s2.0-85048947972 (Scopus ID)
Available from: 2018-10-31 Created: 2018-10-31 Last updated: 2019-10-25Bibliographically approved

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