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Reverse membrane bioreactor: Introduction to a new technology for biofuel production
University of Borås, Faculty of Textiles, Engineering and Business.
University of Borås, Faculty of Textiles, Engineering and Business.
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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)]

Place, publisher, year, edition, pages
2016. Vol. 34, no 5, p. 954-75
Keywords [en]
bioconversion, biofilm, diffusion, fouling, inhibitory compounds, membrane bioreactor, reverse membrane bioreactor, suspended solid
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-10778DOI: 10.1016/j.biotechadv.2016.05.009ISI: 000380600200032PubMedID: 27238291Scopus ID: 2-s2.0-84973103296OAI: oai:DiVA.org:hb-10778DiVA, id: diva2:974841
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
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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Ylitervo, PäiviTaherzadeh, Mohammad J

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