One-stage H2 and CH4 and two-stage H2 + CH4 production from grass silage and from solid and liquid fractions of NaOH pre-treated grass silage

Outi M. Pakarinen; H.P. Tähti; J.A. Rintala

doi:10.1016/j.biombioe.2009.06.006

One-stage H₂ and CH₄ and two-stage H₂ + CH₄ production from grass silage and from solid and liquid fractions of NaOH pre-treated grass silage

Outi M. Pakarinen^*
, H.P. Tähti
, J.A. Rintala

^*Corresponding author for this work

Not published at VTT

University of Jyväskylä

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

69 Citations (Scopus)

Abstract

In the present study, mesophilic CH₄ production from grass silage in a one-stage process was compared with the combined thermophilic H₂ and mesophilic CH₄ production in a two-stage process. In addition, solid and liquid fractions separated from NaOH pre-treated grass silage were also used as substrates. Results showed that higher CH₄ yield was obtained from grass silage in a two-stage process (467 ml g^-1 volatile solids (VS)_original) compared with a one-stage process (431 ml g^-1 VS_original). Similarly, CH₄ yield from solid fraction increased from 252 to 413 ml g^-1 VS_original whereas CH₄ yield from liquid fraction decreased from 82 to 60 ml g^-1 VS_original in a two-stage compared to a one-stage process. NaOH pre-treatment increased combined H₂ yield by 15% (from 5.54 to 6.46 ml g^-1 VS_original). In contrast, NaOH pre-treatment decreased the combined CH₄ yield by 23%. Compared to the energy value of CH₄ yield obtained, the energy value of H₂ yield remained low. According to this study, highest CH₄ yield (495 ml g^-1 VS_original) could be obtained, if grass silage was first pre-treated with NaOH, and the separated solid fraction was digested in a two-stage (thermophilic H₂ and mesophilic CH₄) process while the liquid fraction could be treated directly in a one-stage CH₄ process.

Original language	English
Pages (from-to)	1419-1427
Journal	Biomass and Bioenergy
Volume	33
Issue number	10
DOIs	https://doi.org/10.1016/j.biombioe.2009.06.006
Publication status	Published - Oct 2009
MoE publication type	A1 Journal article-refereed

Funding

This study was financed by the Nordic Energy Research (project BioHydrogen 2003–2006 and 2007–2010), EU 6th Framework Programme (project SES6-CT-2004-502824, CROPGEN) and Finnish Graduate School for Energy Technology.

UN SDGs

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

SDG 7 Affordable and Clean Energy

Keywords

Alkaline treatment
Dark fermentation
Grass silage
Hydrogen
Methane
Two-stage

Access to Document

10.1016/j.biombioe.2009.06.006

Cite this

@article{3b316228b8884329bd83d9fe255cf1ea,

title = "One-stage H2 and CH4 and two-stage H2 + CH4 production from grass silage and from solid and liquid fractions of NaOH pre-treated grass silage",

abstract = "In the present study, mesophilic CH4 production from grass silage in a one-stage process was compared with the combined thermophilic H2 and mesophilic CH4 production in a two-stage process. In addition, solid and liquid fractions separated from NaOH pre-treated grass silage were also used as substrates. Results showed that higher CH4 yield was obtained from grass silage in a two-stage process (467 ml g-1 volatile solids (VS)original) compared with a one-stage process (431 ml g-1 VSoriginal). Similarly, CH4 yield from solid fraction increased from 252 to 413 ml g-1 VSoriginal whereas CH4 yield from liquid fraction decreased from 82 to 60 ml g-1 VSoriginal in a two-stage compared to a one-stage process. NaOH pre-treatment increased combined H2 yield by 15\% (from 5.54 to 6.46 ml g-1 VSoriginal). In contrast, NaOH pre-treatment decreased the combined CH4 yield by 23\%. Compared to the energy value of CH4 yield obtained, the energy value of H2 yield remained low. According to this study, highest CH4 yield (495 ml g-1 VSoriginal) could be obtained, if grass silage was first pre-treated with NaOH, and the separated solid fraction was digested in a two-stage (thermophilic H2 and mesophilic CH4) process while the liquid fraction could be treated directly in a one-stage CH4 process.",

keywords = "Alkaline treatment, Dark fermentation, Grass silage, Hydrogen, Methane, Two-stage",

author = "Pakarinen, \{Outi M.\} and H.P. T{\"a}hti and J.A. Rintala",

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T1 - One-stage H2 and CH4 and two-stage H2 + CH4 production from grass silage and from solid and liquid fractions of NaOH pre-treated grass silage

AU - Pakarinen, Outi M.

AU - Tähti, H.P.

AU - Rintala, J.A.

PY - 2009/10

Y1 - 2009/10

N2 - In the present study, mesophilic CH4 production from grass silage in a one-stage process was compared with the combined thermophilic H2 and mesophilic CH4 production in a two-stage process. In addition, solid and liquid fractions separated from NaOH pre-treated grass silage were also used as substrates. Results showed that higher CH4 yield was obtained from grass silage in a two-stage process (467 ml g-1 volatile solids (VS)original) compared with a one-stage process (431 ml g-1 VSoriginal). Similarly, CH4 yield from solid fraction increased from 252 to 413 ml g-1 VSoriginal whereas CH4 yield from liquid fraction decreased from 82 to 60 ml g-1 VSoriginal in a two-stage compared to a one-stage process. NaOH pre-treatment increased combined H2 yield by 15% (from 5.54 to 6.46 ml g-1 VSoriginal). In contrast, NaOH pre-treatment decreased the combined CH4 yield by 23%. Compared to the energy value of CH4 yield obtained, the energy value of H2 yield remained low. According to this study, highest CH4 yield (495 ml g-1 VSoriginal) could be obtained, if grass silage was first pre-treated with NaOH, and the separated solid fraction was digested in a two-stage (thermophilic H2 and mesophilic CH4) process while the liquid fraction could be treated directly in a one-stage CH4 process.

AB - In the present study, mesophilic CH4 production from grass silage in a one-stage process was compared with the combined thermophilic H2 and mesophilic CH4 production in a two-stage process. In addition, solid and liquid fractions separated from NaOH pre-treated grass silage were also used as substrates. Results showed that higher CH4 yield was obtained from grass silage in a two-stage process (467 ml g-1 volatile solids (VS)original) compared with a one-stage process (431 ml g-1 VSoriginal). Similarly, CH4 yield from solid fraction increased from 252 to 413 ml g-1 VSoriginal whereas CH4 yield from liquid fraction decreased from 82 to 60 ml g-1 VSoriginal in a two-stage compared to a one-stage process. NaOH pre-treatment increased combined H2 yield by 15% (from 5.54 to 6.46 ml g-1 VSoriginal). In contrast, NaOH pre-treatment decreased the combined CH4 yield by 23%. Compared to the energy value of CH4 yield obtained, the energy value of H2 yield remained low. According to this study, highest CH4 yield (495 ml g-1 VSoriginal) could be obtained, if grass silage was first pre-treated with NaOH, and the separated solid fraction was digested in a two-stage (thermophilic H2 and mesophilic CH4) process while the liquid fraction could be treated directly in a one-stage CH4 process.

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KW - Dark fermentation

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KW - Hydrogen

KW - Methane

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