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Effect of Cobalt, N...
Effect of Cobalt, Nickel, and Selenium/Tungsten Deficiency on Mesophilic Anaerobic Digestion of Chemically Defined Soluble Organic Compounds
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- Safaric, Luka, 1988- (author)
- Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten,Biogas Research Center
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- Shakeri Yekta, Sepehr, 1982- (author)
- Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten,Biogas Research Center
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- Svensson, Bo H., 1946- (author)
- Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten,Biogas Research Center
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- Schnürer, Anna (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten,Department of Molecular Science, Swedish University of Agricultural Science, Uppsala BioCenter, Uppsala, Sweden,Biogas Research Center,Institutionen för Molekylära vetenskaper,Department of Molecular Sciences,Linköping University
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- Bastviken, David, 1971- (author)
- Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
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- Björn (Fredriksson), Annika, 1972- (author)
- Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten,Biogas Research Center
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(creator_code:org_t)
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- 2020-04-20
- 2020
- English.
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In: Microorganisms. - : MDPI. - 2076-2607. ; 8:4
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Abstract
Subject headings
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- Trace elements (TEs) are vital for anaerobic digestion (AD), due to their role as cofactors in many key enzymes. The aim of this study was to evaluate the effects of specific TE deficiencies on mixed microbial communities during AD of soluble polymer-free substrates, thus focusing on AD after hydrolysis. Three mesophilic (37 degrees C) continuous stirred-tank biogas reactors were depleted either of Co, Ni, or a combination of Se and W, respectively, by discontinuing their supplementation. Ni and Se/W depletion led to changes in methane kinetics, linked to progressive volatile fatty acid (VFA) accumulation, eventually resulting in process failure. No significant changes occurred in the Co-depleted reactor, indicating that the amount of Co present in the substrate in absence of supplementation was sufficient to maintain process stability. Archaeal communities remained fairly stable independent of TE concentrations, while bacterial communities gradually changed with VFA accumulation in Ni- and Se-/W-depleted reactors. Despite this, the communities remained relatively similar between these two reactors, suggesting that the major shifts in composition likely occurred due to the accumulating VFAs. Overall, the results indicate that Ni and Se/W depletion primarily lead to slower metabolic activities of methanogenic archaea and their syntrophic partners, which then has a ripple effect throughout the microbial community due to a gradual accumulation of intermediate fermentation products.
Subject headings
- NATURVETENSKAP -- Biologi -- Mikrobiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Microbiology (hsv//eng)
Keyword
- artificial substrate; biogas; trace elements; micronutrients; volatile fatty acids; kinetics
Publication and Content Type
- ref (subject category)
- art (subject category)
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