Arid
DOI10.1186/s13068-015-0243-x
Exploitation of algal-bacterial associations in a two-stage biohydrogen and biogas generation process
Wirth, Roland1; Lakatos, Gergely2; Maroti, Gergely2; Bagi, Zoltan1; Minarovics, Janos4; Nagy, Katalin4; Kondorosi, Eva2; Rakhely, Gabor1,3; Kovacs, Kornel L.1,3,4
通讯作者Kovacs, Kornel L.
来源期刊BIOTECHNOLOGY FOR BIOFUELS
ISSN1754-6834
出版年2015
卷号8
英文摘要

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 O-2 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.


英文关键词Microalgae Biogas Biohydrogen Algal bacterial co-culture Metagenomics
类型Article
语种英语
国家Hungary
收录类别SCI-E
WOS记录号WOS:000352940900001
WOS关键词MICROALGAE-BASED BIOREFINERY ; CHLAMYDOMONAS-REINHARDTII ; ANAEROBIC-DIGESTION ; MICROBIAL COMMUNITY ; HYDROGEN PHOTOPRODUCTION ; CHLORELLA-VULGARIS ; STRAIN SELECTION ; BIOFUELS ; RHIZOBIUM ; GROWTH
WOS类目Biotechnology & Applied Microbiology ; Energy & Fuels
WOS研究方向Biotechnology & Applied Microbiology ; Energy & Fuels
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/186273
作者单位1.Univ Szeged, Dept Biotechnol, H-6726 Szeged, Hungary;
2.Hungarian Acad Sci, Biol Res Ctr, Inst Biochem, H-6726 Szeged, Hungary;
3.Hungarian Acad Sci, Biol Res Ctr, Inst Biophys, H-6726 Szeged, Hungary;
4.Univ Szeged, Dept Oral Biol & Expt Dent Res, H-6720 Szeged, Hungary
推荐引用方式
GB/T 7714
Wirth, Roland,Lakatos, Gergely,Maroti, Gergely,et al. Exploitation of algal-bacterial associations in a two-stage biohydrogen and biogas generation process[J],2015,8.
APA Wirth, Roland.,Lakatos, Gergely.,Maroti, Gergely.,Bagi, Zoltan.,Minarovics, Janos.,...&Kovacs, Kornel L..(2015).Exploitation of algal-bacterial associations in a two-stage biohydrogen and biogas generation process.BIOTECHNOLOGY FOR BIOFUELS,8.
MLA Wirth, Roland,et al."Exploitation of algal-bacterial associations in a two-stage biohydrogen and biogas generation process".BIOTECHNOLOGY FOR BIOFUELS 8(2015).
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