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Zeolites relieves inhibitory stress from high concentrations of long chain fatty acids
Linköping University, Biogas Research Center. Tekniska Verken Linkoping AB Publ, Dept Biogas RandD, SE-58115 Linkoping, Sweden .
Linköping University, Biogas Research Center. Tekniska Verken Linkoping AB Publ, Dept Biogas RandD, SE-58115 Linkoping, Sweden .
Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, The Institute of Technology. Linköping University, Biogas Research Center. Tekniska Verken Linkoping AB Publ, Dept Biogas RandD, SE-58115 Linkoping, Sweden .
2013 (English)In: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 33, no 12, p. 2659-2663Article in journal (Refereed) Published
Abstract [en]

Protein and fat rich slaughterhouse waste is a very attractive waste stream for the production of biogas because of the high biochemical methane potential of the substrate. The material has however some drawbacks as the sole material for biogas production due to the production of several process disturbing metabolites such as ammonia, sulfides and long chain fatty acids. We can in this work present results that show that zeolites have the potential to relieve inhibitory stress from the presence of long chain fatty acids. Moreover, the results strongly indicate that it is mainly acetic acid consumers that are most negatively affected by long chain fatty acids and that the mechanism of stress relief is an adsorption of long chain fatty acids to the zeolites. In addition to this, it is shown that the effect is immediate and that only a small amount of zeolites is necessary to cancel the inhibitory effect of long chain fatty acids.

Place, publisher, year, edition, pages
Elsevier , 2013. Vol. 33, no 12, p. 2659-2663
Keyword [en]
Zeolites, Anaerobic digestion, Long chain fatty acids, Inhibition, Slaughterhouse waste
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-103406DOI: 10.1016/j.wasman.2013.08.009ISI: 000328309400010OAI: oai:DiVA.org:liu-103406DiVA, id: diva2:689066
Available from: 2014-01-20 Created: 2014-01-20 Last updated: 2018-05-07
In thesis
1. Influencing anaerobic digestion early stage processes for increased biomethane production from different substrate components
Open this publication in new window or tab >>Influencing anaerobic digestion early stage processes for increased biomethane production from different substrate components
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Finding alternatives to petroleum-based energy sources is of interest since it could reduce the emissions of net carbon dioxide to the atmosphere by increasing the usage of renewable energy sources. To do so improvements are needed in the renewable energy production sector. Biogas production is of interest since the anaerobic digestion process can degrade many different biomolecules and is, contrary to e.g. bioethanol and biodiesel, not dependent on specific molecules. Thus, many wastes such as slaughterhouse waste, sludge from waste water treatment and lignocellulose residual material etc. can be used as substrates for biogas production. However, there are limitations in the degradation process depending on the composition of the selected substrate. To overcome these limitations such as inhibition of different microorganisms, or recalcitrant substrate, different methods can be used to increase the biogas production.

 In this study different substrates were selected and analyzed/treated for remedies of early stage rate limiting problems of the anaerobic digestion process. Different analyzes and techniques were selected depending on the limitations correlated to the main problematic component of the specific substrate.

 Improvements could be reached for the degradation of slaughterhouse waste by augmentation with the clay mineral zeolite. Addition of different enzymes to the substrate environment of different waste water treatment plant sludges resulted in limited life time of the selected enzymes. However, certain enzymes proved to be promising candidates with an effect of increased biogas production rate and yield for the time that the enzyme remained active. In an additional experiment, cellulolytic enzymes, naturally produced by a biogas producing microbial community, were induced, collected and added to a biogas experiment of ensiled forage ley, by which it was shown that these cellulases led to an increase in biogas production rate and yield. Thus, the studies demonstrate different techniques for improving the anaerobic digestion process of different types of substrates.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2018. p. 56
Series
Linköping Studies in Science and Technology. Licentiate Thesis, ISSN 0280-7971 ; 1807
National Category
Biocatalysis and Enzyme Technology
Identifiers
urn:nbn:se:liu:diva-147721 (URN)10.3384/lic.diva-147721 (DOI)9789176852866 (ISBN)
Presentation
2018-05-31, BL21 (Nobel), Campus Valla, Linköping, 10:30 (English)
Opponent
Note

Handledare saknas

Available from: 2018-05-07 Created: 2018-05-07 Last updated: 2018-05-07Bibliographically approved

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Karlsson, Martin

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