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Effects of Heavy Metals and pH on the Conversion of Biomass to Hydrogen via Syngas Fermentation
University of Borås, Faculty of Textiles, Engineering and Business. (Biotechnology)ORCID iD: 0000-0002-6886-4994
(Biotechnology)
Chalmers Technical University.
University of Borås, Faculty of Textiles, Engineering and Business. (Biotechnology)ORCID iD: 0000-0003-4887-2433
2018 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126Article in journal (Refereed) Published
Sustainable development
In my opinion, the content of this publication falls within the area of sustainable development.
Abstract [en]

The effects of three heavy metals on hydrogen production via syngas fermentation were investigated within a metal concentration range of 0-1.5 mg Cu/L, 0-9 mg Zn/L, 0-42 mg Mn/L, in media with initial pH of 5, 6 and 7, at 55 °C. The results showed that at lower metal concentration, pH 6 was optimum while at higher metal concentrations, pH 5 stimulated the process. More specifically, the highest hydrogen production activity recorded was 155.28% ± 12.02% at a metal concentration of 0.04 mg Cu/L, 0.25 mg Zn/L, and 1.06 mg Mn/L and an initial medium pH of 6. At higher metal concentration (0.625 mg Cu/L, 3.75 mg Zn/L, and 17.5 mg Mn/L), only pH 5 was stimulating for the cells. The results show that the addition of heavy metals, contained in gasification-derived ash, can improve the production rate and yield of fermentative hydrogen. This could lead in lower costs in gasification process and fermentative hydrogen production and less demand for syngas cleaning before syngas fermentation.

Place, publisher, year, edition, pages
2018.
Keywords [en]
Gasification; Syngas; Fermentative hydrogen; Heavy metals; pH
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-14189OAI: oai:DiVA.org:hb-14189DiVA, id: diva2:1206294
Funder
Swedish Research CouncilAvailable from: 2018-05-16 Created: 2018-05-16 Last updated: 2019-10-25Bibliographically approved
In thesis
1. Enhanced Methane and Hydrogen production in Reverse Membrane Bioreactors via Syngas Fermentation
Open this publication in new window or tab >>Enhanced Methane and Hydrogen production in Reverse Membrane Bioreactors via Syngas Fermentation
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

of waste treatment processes, such as the anaerobic digestion. This biochemical process converts organic substrates into biogas, with anaerobic microorganisms. However, some types of substrates have low bio-degradability due to its recalcitrance or the presence of inhibitors. This can be solved by the coupling of anaerobic digestion with gasification, a thermochemical process that can convert organic substrates into syngas (H2, CO, and CO2) regardless of the substrate´s degradability. Consequently, syngas can be converted into biogas and other fermentative products via anaerobic digestion, in a process known as syngas fermentation. In comparison to the catalytic conversion of syngas, syngas fermentation has several advantages such as lower sensitivity to CO/H2/CO2 ratio and to syngas contaminants as well as higher product specificity.

The main goal of this thesis was to improve the syngas conversion rate into CH4 and H2 by addressing the cell washout, the cell inhibition by syngas contaminants, and the low gas-to-liquid mass transfer, which are major challenges in syngas fermentation. For this purpose, a reverse membrane bioreactor, containing a mixed culture encased in membranes, was used in various set ups. The membranes were used in order to retain the cells inside the bioreactors, to protect the cells against inhibitors, and to improve the gas holdup and gas-to-cell contact by decreasing the rise velocity of syngas bubbles. As evident from the results, the cell washout was successfully tackled during a continuous experiment that lasted 154 days. In addition, membrane bioreactors fed with the syngas contaminants, toluene and naphthalene, achieved approximately 92% and 15% higher CH4 production rate, respectively, compared with the free cell bioreactors. In order to improve the gas holdup and consequently the gas-to-liquid mass transfer of syngas, a floating membrane bed bioreactor was set up. This bioreactor contained membrane sachets, filled with inoculum that formed a packed floating membrane bed and achieved an increase of 38% and 28% for the conversion rate of H2 and CO, respectively. Furthermore, the addition of a mixture of heavy metals improved the production rates and yields during the syngas conversion into fermentative H2.

Place, publisher, year, edition, pages
Borås: Högskolan i Borås, 2019
Series
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 99
Keywords
syngas fermentation, CH4, H2, cell washout, inhibitors, mass transfer
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-21740 (URN)978-91-88838-45-2 (ISBN)978-91-88838-46-9 (ISBN)
Public defence
2019-11-29, D207, University of Borås, Allégatan 1, Borås, 10:00 (English)
Opponent
Available from: 2019-11-06 Created: 2019-09-18 Last updated: 2019-11-21Bibliographically approved

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http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_13_2_4455_Chandolias_Heavy_Metals_pH_Conversion/6087

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Chandolias, KonstantinosWainaina, StevenTaherzadeh, Mohammad J

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