Skyllberg, Ulf
- Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
Sammanfattning
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.
Nyckelord
Anaerobic digestion; Sulfide; Iron; Microbial community; Sewage sludge
Publicerad i
Journal of Bioscience and Bioengineering
2017, volym: 123, nummer: 5, sidor: 597-605
Utgivare: SOC BIOSCIENCE BIOENGINEERING JAPAN
SLU författare
UKÄ forskningsämne
Bioenergi
Publikationens identifierare
- DOI: https://doi.org/10.1016/j.jbiosc.2016.12.003
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/83022