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Metagenome changes in the mesophilic biogas-producing community during fermentation of the green alga Scenedesmus obliquus
- Source :
- Journal of Biotechnology
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- A microalgal biomass offers a potential alternative to the maize silage commonly used in biogas technology. In this study, photoautotrophically grown Scenedesmus obliquus was used as biogas substrate. This microalga has a low C/N ratio of 8.5 relative to the optimum 20–30. A significant increase in the ammonium ion content was not observed. The methane content of the biogas generated from Sc. obliquus proved to be higher than that from maize silage, but the specific biogas yield was lower. Semi-continuous steady biogas production lasted for 2 months. Because of the thick cell wall of Sc. obliquus , the biomass-degrading microorganisms require additional time to digest its biomass. The methane concentration in the biogas was also high, in co-digestion (i.e., 52–56%) as in alga-fed anaerobic digestion (i.e., 55–62%). These results may be related to the relative predominance of the order Clostridiales in co-digestion and to the more balanced C/N ratio of the mixed algal–maize biomass. Predominance of the order Methanosarcinales was observed in the domain Archaea, which supported the diversity of metabolic pathways in the process.
- Subjects :
- Silage
020209 energy
Microorganism
Biomass
Biogas
Bioengineering
02 engineering and technology
Biology
7. Clean energy
Zea mays
Applied Microbiology and Biotechnology
03 medical and health sciences
Bioreactors
Scenedesmus obliquus
Botany
Ammonium Compounds
Microbial community
0202 electrical engineering, electronic engineering, information engineering
Microalgae
Food science
0303 health sciences
030306 microbiology
General Medicine
Methanosarcinales
Archaea
Anaerobic digestion
Biofuel
Biofuels
Fermentation
Next-generation sequencing
Metagenome
Metagenomics
Methane
Mesophile
Scenedesmus
Biotechnology
Subjects
Details
- ISSN :
- 01681656
- Volume :
- 215
- Database :
- OpenAIRE
- Journal :
- Journal of Biotechnology
- Accession number :
- edsair.doi.dedup.....36051d07714d2a2132f2c63546d33355
- Full Text :
- https://doi.org/10.1016/j.jbiotec.2015.06.396