Journal
BIORESOURCE TECHNOLOGY
Volume 218, Issue -, Pages 224-231Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.06.092
Keywords
Macro-algae; Micro-algae; Co-fermentation; Hydrogen; Methane
Funding
- Science Foundation Ireland Ireland [12/RC/2302]
- MaREI Director's Fund - Ireland [12/RC/2305s2]
- Gas Networks Ireland through the Green Gas Innovation Group
- ERVIA
- National Key Technology R&D Program - China [2015BAD21B01]
- National Natural Science Foundation - China [51476141]
- Zhejiang Provincial Natural Science Foundation - China [LR14E060002]
- Chongqing University
- Science Foundation Ireland (SFI) [12/RC/2305s2] Funding Source: Science Foundation Ireland (SFI)
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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 94.5-97.0 mL/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. (C) 2016 Elsevier Ltd. All rights reserved.
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