Co-generation of biohydrogen and biomethane through two-stage batch co-fermentation of macro- and micro-algal biomass

Lingkan Ding; Jun Cheng; Ao Xia; Amita Jacob; Markus Voelklein; Jerry D. Murphy

doi:10.1016/j.biortech.2016.06.092

Co-generation of biohydrogen and biomethane through two-stage batch co-fermentation of macro- and micro-algal biomass

Lingkan Ding, Jun Cheng, Ao Xia, Amita Jacob, Markus Voelklein, Jerry D. Murphy

Research output: Contribution to journal › Article › peer-review

74 Scopus citations

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 94.5-97.0 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.

Original language	English (US)
Pages (from-to)	224-231
Number of pages	8
Journal	Bioresource Technology
Volume	218
DOIs	https://doi.org/10.1016/j.biortech.2016.06.092
State	Published - Oct 1 2016
Externally published	Yes

Bibliographical note

Funding Information:
This study is supported by the Science Foundation Ireland – Ireland (12/RC/2302), MaREI Director’s Fund – Ireland (12/RC/2305s2), Gas Networks Ireland through the Green Gas Innovation Group and by ERVIA , National Key Technology R&D Program – China ( 2015BAD21B01 ), National Natural Science Foundation – China ( 51476141 ), Zhejiang Provincial Natural Science Foundation – China ( LR14E060002 ). Dr. Ao Xia acknowledges Chongqing University for the start-up funds under the “One Hundred Talents Program.” The authors wish to thank the Daithi O’Murchu Marine Research Station for advice on seaweed species and for facilitating the collection of the seaweeds.

Publisher Copyright:
© 2016 Elsevier Ltd.

Keywords

Co-fermentation
Hydrogen
Macro-algae
Methane
Micro-algae

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.biortech.2016.06.092

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title = "Co-generation of biohydrogen and biomethane through two-stage batch co-fermentation of macro- and micro-algal biomass",

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 94.5-97.0 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.",

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AU - Jacob, Amita

AU - Voelklein, Markus

AU - Murphy, Jerry D.

N1 - Funding Information: This study is supported by the Science Foundation Ireland – Ireland (12/RC/2302), MaREI Director’s Fund – Ireland (12/RC/2305s2), Gas Networks Ireland through the Green Gas Innovation Group and by ERVIA , National Key Technology R&D Program – China ( 2015BAD21B01 ), National Natural Science Foundation – China ( 51476141 ), Zhejiang Provincial Natural Science Foundation – China ( LR14E060002 ). Dr. Ao Xia acknowledges Chongqing University for the start-up funds under the “One Hundred Talents Program.” The authors wish to thank the Daithi O’Murchu Marine Research Station for advice on seaweed species and for facilitating the collection of the seaweeds. Publisher Copyright: © 2016 Elsevier Ltd.

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N2 - 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.

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Co-generation of biohydrogen and biomethane through two-stage batch co-fermentation of macro- and micro-algal biomass

Abstract

Bibliographical note

Keywords

UN SDGs

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