| Title: | "Effect of Cobalt, Nickel, and Selenium/Tungsten Deficiency on Mesophilic Anaerobic Digestion of Chemically Defined Soluble Organic Compounds" |
| Author(s): | Safaric L; Yekta SS; Svensson BH; Schnurer A; Bastviken D; Bjorn A; |
| Address: | "Department of Thematic Studies-Environmental Change, Linkoping University, SE-581 83 Linkoping, Sweden. Biogas Research Center, Linkoping University, SE-581 83 Linkoping, Sweden. Department of Molecular Science, Swedish University of Agricultural Science, Uppsala BioCenter, SE-750 07 Uppsala, Sweden" |
| DOI: | 10.3390/microorganisms8040598 |
| ISSN/ISBN: | 2076-2607 (Print) 2076-2607 (Electronic) 2076-2607 (Linking) |
| Abstract: | "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" |
| Keywords: | artificial substrate biogas kinetics micronutrients trace elements volatile fatty acids; |
| Notes: | "PubMed-not-MEDLINESafaric, Luka Yekta, Sepehr Shakeri Svensson, Bo H Schnurer, Anna Bastviken, David Bjorn, Annika eng 316838/FP7 People: Marie-Curie Actions/ 2016-01054/Svenska Forskningsradet Formas/ 35624-2/Energimyndigheten/ Switzerland 2020/04/25 Microorganisms. 2020 Apr 20; 8(4):598. doi: 10.3390/microorganisms8040598" |
