Structures of microbial communities found in anaerobic batch runs that produce methane from propionic acid?Seeded from full-scale anaerobic digesters above a certain threshold
- Structures of microbial communities found in anaerobic batch runs that produce methane from propionic acid?Seeded from full-scale anaerobic digesters above a certain threshold
- 김웅; 신승구; 한규성; 조경진; 황석환
- Propionate; Methane; Smithella; Anaerobic digestion; Collaboration
- Issue Date
- Journal of biotechnology
- VOL 214, NO 20, 192-198
- The volatile fatty acid propionate inhibits anaerobic digestion during organic waste treatments. Toexamine potential microbial interactions that accelerate propionate oxidation, anaerobic digestion sys-tems seeded with various types of anaerobic sludge were analyzed. Seed samples were collected from10 different full-scale anaerobic reactors in South Korea. Propionate oxidation was estimated as themethane production rate per gram of propionate used per day. Two domestic sewage sludge showedthe highest methane production rate values, 109.1 ± 4.2 and 74.5 ± 8.6 mL CH4/(g propionate·d). Afood waste recycling wastewater source exhibited the lowest methane production rate, 33.2 ± 2.6 mLCH4/(g propionate·d). To investigate how the microbial community structure affected propionate oxi-dation, qualitative molecular analyses were carried out using denaturing gradient gel electrophoresis.Methanosaeta concilii, an aceticlastic methanogen, was detected in most batch runs. Smithella propi-onica, a unique propionate oxidizer and simultaneous producer of acetate, was found in domestic sewagesludge sources showing the highest methane production rate; in contrast, Desulfobulbus rhabdoformis,a sulfate reducer coupled with the consumption of acetate to be used as a precursor of methane, wasobserved in food waste recycling wastewater sludge source showing the lowest methane productionrate. Thus, we propose that S. propionica, a syntrophic acetate producer using propionate, might cooper-ate with aceticlastic methanogens for high methane production during anaerobic digestion that includedpropionate.
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