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Co-generation of biohydrogen and biomethane through two-stage batch co-fermentation of macro- and micro-algal biomass.
- Source :
-
Bioresource technology [Bioresour Technol] 2016 Oct; Vol. 218, pp. 224-31. Date of Electronic Publication: 2016 Jun 25. - Publication Year :
- 2016
-
Abstract
- Aquatic micro-algae can be used as feedstocks for gaseous biofuel production via biological fermentation. However, micro-algae usually have low C/N ratios, which are not advantageous for fermentation. In this study, carbon-rich macro-algae (Laminaria digitata) mixed with nitrogen-rich micro-algae (Chlorella pyrenoidosa and Nannochloropsis oceanica) were used to maintain a suitable C/N ratio of 20 for a two-stage process combining hydrogen and methane fermentation. Co-fermentation of L. digitata and micro-algae facilitated hydrolysis and acidogenesis, resulting in hydrogen yields of 94.5-97.0mL/gVS; these values were 15.5-18.5% higher than mono-fermentation using L. digitata. Through the second stage of methane co-fermentation, a large portion of energy remaining in the hydrogenogenic effluents was recovered in the form of biomethane. The two-stage batch co-fermentation markedly increased the energy conversion efficiencies (ECEs) from 4.6-6.6% during the hydrogen fermentation to 57.0-70.9% in the combined hydrogen and methane production.<br /> (Copyright © 2016 Elsevier Ltd. All rights reserved.)
- Subjects :
- Biomass
Carbon analysis
Carbon chemistry
Carbon metabolism
Chlorella microbiology
Conservation of Energy Resources
Fermentation
Hydrogen analysis
Hydrogen chemistry
Laminaria metabolism
Methane analysis
Methane chemistry
Nitrogen analysis
Nitrogen chemistry
Nitrogen metabolism
Renewable Energy
Biofuels
Bioreactors
Hydrogen metabolism
Methane metabolism
Microalgae metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1873-2976
- Volume :
- 218
- Database :
- MEDLINE
- Journal :
- Bioresource technology
- Publication Type :
- Academic Journal
- Accession number :
- 27371795
- Full Text :
- https://doi.org/10.1016/j.biortech.2016.06.092