Selection of Bacteria Capable of Dissimilatory Reduction of Fe(III) from a Long-term Continuous Culture on Molasses and Their Use in a Microbial Fuel Cell

Sikora, Anna; Wójtowicz-Sieńko, Justyna; Piela, Piotr; Zielenkiewicz, Urszula; Tomczyk-Żak, Karolina; Chojnacka, Aleksandra; Sikora, Radosław; Kowalczyk, Paweł; Grzesiuk, Elżbieta; Błaszczyk, Mieczysław

doi:10.4014/jmb.1006.06022

Cited by 16 publications

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“…The concentration of sulfate in the acidic effluent from molasses fermentation was determined using a NANOCOLOR SULFAT 200 kit (Machery-Nagel). The content of Fe(II) in the effluent from the UASB bioreactor was determined as described previously [ 29 ].…”

Section: Methodsmentioning

confidence: 99%

Noteworthy Facts about a Methane-Producing Microbial Community Processing Acidic Effluent from Sugar Beet Molasses Fermentation

et al. 2015

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Anaerobic digestion is a complex process involving hydrolysis, acidogenesis, acetogenesis and methanogenesis. The separation of the hydrogen-yielding (dark fermentation) and methane-yielding steps under controlled conditions permits the production of hydrogen and methane from biomass. The characterization of microbial communities developed in bioreactors is crucial for the understanding and optimization of fermentation processes. Previously we developed an effective system for hydrogen production based on long-term continuous microbial cultures grown on sugar beet molasses. Here, the acidic effluent from molasses fermentation was used as the substrate for methanogenesis in an upflow anaerobic sludge blanket bioreactor. This study focused on the molecular analysis of the methane-yielding community processing the non-gaseous products of molasses fermentation. The substrate for methanogenesis produces conditions that favor the hydrogenotrophic pathway of methane synthesis. Methane production results from syntrophic metabolism whose key process is hydrogen transfer between bacteria and methanogenic Archaea. High-throughput 454 pyrosequencing of total DNA isolated from the methanogenic microbial community and bioinformatic sequence analysis revealed that the domain Bacteria was dominated by Firmicutes (mainly Clostridia), Bacteroidetes, δ- and γ-Proteobacteria, Cloacimonetes and Spirochaetes. In the domain Archaea, the order Methanomicrobiales was predominant, with Methanoculleus as the most abundant genus. The second and third most abundant members of the Archaeal community were representatives of the Methanomassiliicoccales and the Methanosarcinales. Analysis of the methanogenic sludge by scanning electron microscopy with Energy Dispersive X-ray Spectroscopy and X-ray diffraction showed that it was composed of small highly heterogeneous mineral-rich granules. Mineral components of methanogenic granules probably modulate syntrophic metabolism and methanogenic pathways. A rough functional analysis from shotgun data of the metagenome demonstrated that our knowledge of methanogenesis is poor and/or the enzymes responsible for methane production are highly effective, since despite reasonably good sequencing coverage, the details of the functional potential of the microbial community appeared to be incomplete.

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Section: Methodsmentioning

confidence: 99%

Noteworthy Facts about a Methane-Producing Microbial Community Processing Acidic Effluent from Sugar Beet Molasses Fermentation

et al. 2015

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“…16,35 They capture electrons during the substrate degradation process and participate in the cycles of nitrogen, sulfur, iron, etc., with the assistance of related bacteria. Studies have shown that microorganisms can oxidize organic pollutants to carbon dioxide in anaerobic conditions with the reduction of sulfate, nitrate, or Fe(III), [36][37][38] and the addition of these electron acceptors can promote the metabolic activity of related microorganisms. It was found the enrichment of Desulfobulbaceae and Desulfobacteraceae, which belong to traditional sulfate-reducing bacteria (SRB), during the degradation of toluene in a BES.…”

Section: Diverse Functions In Bessmentioning

confidence: 99%