Production of sugars from grass silage after steam explosion or soaking in aqueous ammonia

Piritta Niemi, Ville Pihlajaniemi, Marketta Rinne, Matti Siika-aho

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

Grass is an underutilized potential feedstock for lignocellulosic sugar production for biorefinery applications and can be stabilized by ensiling for year-round supply. This study compared soaking in aqueous ammonia and steam explosion with dilute acid as pretreatments for enzymatic saccharification of grass silage. Both treatments led to high hydrolysability of the silage carbohydrates. An ammonia loading of 10% per DM was sufficient in an overnight soaking at 90 °C whereas the maximum yield from steam explosion treatment was obtained with 1% acid loading at 190 °C for 10 min. The soluble carbohydrates of silage had to be removed by washing before pretreatment as otherwise severe degradation of sugars was observed. The use of an acid catalyst only had a small effect for total yield in steam explosion, but increased monomerization and degradation of hemicellulosic sugars during pretreatment. Considering the surplus potential of grass production in Europe, grass silage was found to be a very prominent feedstock for lignocellulosic sugar production.
Original languageEnglish
Pages (from-to)93-99
Number of pages7
JournalIndustrial Crops and Products
Volume98
Issue numberJanuary
DOIs
Publication statusPublished - 1 Apr 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

explosions
grass silage
soaking
steam
ammonia
sugars
pretreatment
feedstocks
silage
acids
water
grasses
carbohydrates
biorefining
saccharification
degradation
silage making
surpluses
catalysts
washing

Keywords

  • grass
  • silage
  • enzymatic hydrolysis
  • pretreatment
  • ammonia soaking
  • steam explosion

Cite this

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abstract = "Grass is an underutilized potential feedstock for lignocellulosic sugar production for biorefinery applications and can be stabilized by ensiling for year-round supply. This study compared soaking in aqueous ammonia and steam explosion with dilute acid as pretreatments for enzymatic saccharification of grass silage. Both treatments led to high hydrolysability of the silage carbohydrates. An ammonia loading of 10{\%} per DM was sufficient in an overnight soaking at 90 °C whereas the maximum yield from steam explosion treatment was obtained with 1{\%} acid loading at 190 °C for 10 min. The soluble carbohydrates of silage had to be removed by washing before pretreatment as otherwise severe degradation of sugars was observed. The use of an acid catalyst only had a small effect for total yield in steam explosion, but increased monomerization and degradation of hemicellulosic sugars during pretreatment. Considering the surplus potential of grass production in Europe, grass silage was found to be a very prominent feedstock for lignocellulosic sugar production.",
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Production of sugars from grass silage after steam explosion or soaking in aqueous ammonia. / Niemi, Piritta; Pihlajaniemi, Ville; Rinne, Marketta; Siika-aho, Matti.

In: Industrial Crops and Products, Vol. 98, No. January, 01.04.2017, p. 93-99.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Niemi, Piritta

AU - Pihlajaniemi, Ville

AU - Rinne, Marketta

AU - Siika-aho, Matti

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AB - Grass is an underutilized potential feedstock for lignocellulosic sugar production for biorefinery applications and can be stabilized by ensiling for year-round supply. This study compared soaking in aqueous ammonia and steam explosion with dilute acid as pretreatments for enzymatic saccharification of grass silage. Both treatments led to high hydrolysability of the silage carbohydrates. An ammonia loading of 10% per DM was sufficient in an overnight soaking at 90 °C whereas the maximum yield from steam explosion treatment was obtained with 1% acid loading at 190 °C for 10 min. The soluble carbohydrates of silage had to be removed by washing before pretreatment as otherwise severe degradation of sugars was observed. The use of an acid catalyst only had a small effect for total yield in steam explosion, but increased monomerization and degradation of hemicellulosic sugars during pretreatment. Considering the surplus potential of grass production in Europe, grass silage was found to be a very prominent feedstock for lignocellulosic sugar production.

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