Biotechnology for Biofuels | |
Exploitation of algal-bacterial associations in a two-stage biohydrogen and biogas generation process | |
Roland Wirth4  Gergely Lakatos3  Gergely Maróti3  Zoltán Bagi4  János Minárovics1  Katalin Nagy1  Éva Kondorosi3  Gábor Rákhely2  Kornél L Kovács1  | |
[1] Department of Oral Biology and Experimental Dental Research, University of Szeged, Tisza L. krt. 64, Szeged, 6720, Hungary | |
[2] Institute of Biophysics, Biological Research Center, Hungarian Academy of Sciences, Temesvári krt. 62, Szeged, H-6726, Hungary | |
[3] Institute of Biochemistry, Biological Research Center, Hungarian Academy of Sciences, Temesvári krt. 62, Szeged, H-6726, Hungary | |
[4] Department of Biotechnology, University of Szeged, Közép fasor 52, Szeged, H-6726, Hungary | |
关键词: Metagenomics; Algal bacterial co-culture; Biohydrogen; Biogas; Microalgae; | |
Others : 1180515 DOI : 10.1186/s13068-015-0243-x |
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received in 2014-10-30, accepted in 2015-03-20, 发布年份 2015 | |
【 摘 要 】
Background
The growing concern regarding the use of agricultural land for the production of biomass for food/feed or energy is dictating the search for alternative biomass sources. Photosynthetic microorganisms grown on marginal or deserted land present a promising alternative to the cultivation of energy plants and thereby may dampen the ‘food or fuel’ dispute. Microalgae offer diverse utilization routes.
Results
A two-stage energetic utilization, using a natural mixed population of algae (Chlamydomonas sp. and Scenedesmus sp.) and mutualistic bacteria (primarily Rhizobium sp.), was tested for coupled biohydrogen and biogas production. The microalgal-bacterial biomass generated hydrogen without sulfur deprivation. Algal hydrogen production in the mixed population started earlier but lasted for a shorter period relative to the benchmark approach. The residual biomass after hydrogen production was used for biogas generation and was compared with the biogas production from maize silage. The gas evolved from the microbial biomass was enriched in methane, but the specific gas production was lower than that of maize silage. Sustainable biogas production from the microbial biomass proceeded without noticeable difficulties in continuously stirred fed-batch laboratory-size reactors for an extended period of time. Co-fermentation of the microbial biomass and maize silage improved the biogas production: The metagenomic results indicated that pronounced changes took place in the domain Bacteria, primarily due to the introduction of a considerable bacterial biomass into the system with the substrate; this effect was partially compensated in the case of co-fermentation. The bacteria living in syntrophy with the algae apparently persisted in the anaerobic reactor and predominated in the bacterial population. The Archaea community remained virtually unaffected by the changes in the substrate biomass composition.
Conclusion
Through elimination of cost- and labor-demanding sulfur deprivation, sustainable biohydrogen production can be carried out by using microalgae and their mutualistic bacterial partners. The beneficial effect of the mutualistic mixed bacteria in O2 quenching is that the spent algal-bacterial biomass can be further exploited for biogas production. Anaerobic fermentation of the microbial biomass depends on the composition of the biogas-producing microbial community. Co-fermentation of the mixed microbial biomass with maize silage improved the biogas productivity.
【 授权许可】
2015 Wirth et al.; licensee BioMed Central.
【 预 览 】
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