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Importance of sulfide interaction with iron as regulator of the microbial community in biogas reactors and its effect on methanogenesis, volatile fatty acids turnover, and syntrophic long-chain fatty acids degradation
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
University of Washington, WA 98195 USA.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
Swedish University of Agriculture Science, Sweden.
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2017 (English)In: Journal of Bioscience and Bioengineering, ISSN 1389-1723, E-ISSN 1347-4421, Vol. 123, no 5, 597-605 p.Article in journal (Refereed) Published
Abstract [en]

The inhibitory effects of sulfide on microbial processes during anaerobic digestion have been widely addressed. However, other effects of sulfide are less explored, given that sulfide is a potential sulfur source for microorganisms and its high reactivity triggers a suit of abiotic reactions. We demonstrated that sulfide interaction with Fe regulates the dynamics and activities of microbial community during anaerobic digestion. This was manifested by the S:Fe molar ratio, whose increase adversely influenced the acetoclastic methanogens, Methanosaeta, and turnover of acetate. Dynamics of hydrogenotrophic methanogens, Methanoculleus and Methanobrevibacter, were presumably influenced by sulfide-induced changes in the partial pressure of hydrogen. Interestingly, conversion of the long-chain fatty acid (LCFA), oleate, to methane was enhanced together with the abundance of LCFA-degrading, beta-oxidizing Syntrophomonas at an elevated S:Fe molar ratio. The results suggested that sulfur chemical speciation is a controlling factor for microbial community functions in anaerobic digestion processes. (C) 2016, The Society for Biotechnology, Japan. All rights reserved.

Place, publisher, year, edition, pages
SOC BIOSCIENCE BIOENGINEERING JAPAN , 2017. Vol. 123, no 5, 597-605 p.
Keyword [en]
Anaerobic digestion; Sulfide; Iron; Microbial community; Sewage sludge
National Category
Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:liu:diva-138274DOI: 10.1016/j.jbiosc.2016.12.003ISI: 000401375900010PubMedID: 28057469OAI: oai:DiVA.org:liu-138274DiVA: diva2:1109105
Note

Funding Agencies|Biogas Research Center (BRC), Linkoping, Sweden; Swedish Energy Agency; Linkoping University; Scandinavian Biogas AB; NSR AB; Tekniska Verken AB; Kemira OYJ [35624-2]; University of Washington Valle Scandinavian Exchange Fellowship; Swedish Foundation for International Cooperation in Research and Higher Education

Available from: 2017-06-13 Created: 2017-06-13 Last updated: 2017-06-13

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