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Title (Primary) Metabolic and microbial community dynamics during the anaerobic digestion of maize silage in a two-phase process
Author Sträuber, H.; Lucas, R.; Kleinsteuber, S.;
Journal Applied Microbiology and Biotechnology
Year 2016
Department UMB;
Volume 100
Issue 1
Language englisch;
POF III (all) R31; T15;
Keywords Acidogenesis; 454 Pyrosequencing; T-RFLP; Anaerobic fermentation; Lactic acid; Volatile fatty acids
UFZ wide themes RU4;
Abstract Two-phasic anaerobic digestion processes (hydrolysis/acidogenesis separated from acetogenesis/methanogenesis) can be used for biogas production on demand or a combined chemicals/bioenergy production. For an effective process control, detailed knowledge about the microbial catalysts and their correlation to process conditions is crucial. In this study, maize silage was digested in a two-phase process and interrelationships between process parameters and microbial communities were revealed. In the first-phase reactor, alternating metabolic periods were observed which emerged independently from the feeding frequency. During the L-period, up to 11.8 g L-1 lactic acid was produced which significantly correlated to lactic acid bacteria of the genus Lactobacillus as the most abundant community members. During the alternating G-period, the production of volatile fatty acids (up to 5.3, 4.0 and 3.1 g L−1 for propionic, n-butyric and n-caproic acid, respectively) dominated accompanied by a high gas production containing up to 28 % hydrogen. The relative abundance of various Clostridiales increased during this metabolic period. In the second-phase reactor, the metabolic fluctuations of the first phase were smoothed out resulting in a stable biogas production as well as stable bacterial and methanogenic communities. However, the biogas composition followed the metabolic dynamics of the first phase: the hydrogen content increased during the L-period whereas highest CH4/CO2 ratios (up to 2.8) were reached during the G-period. Aceticlastic Methanosaeta as well as hydrogenotrophic Methanoculleus and Methanobacteriaceae were identified as dominant methanogens. Consequently, a directed control of the first-phase stabilizing desired metabolic states can lead to an enhanced productivity regarding chemicals and bioenergy.
ID 16771
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=16771
Sträuber, H., Lucas, R., Kleinsteuber, S. (2016):
Metabolic and microbial community dynamics during the anaerobic digestion of maize silage in a two-phase process
Appl. Microbiol. Biotechnol. 100 (1), 479 - 491