e-journal

Butanol and ethanol production from lignocellulosic feedstock: biomass pretreatment and bioconversion

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Lignocellulosic feedstock has tremendous potential to sustain the renewable production of biofuels such as ethanol and butanol. Although lignocellulosic biomass is a storehouse of energy in the form of cellulose and hemicellulose,
yet lignin acts as a barrier against their hydrolysis. A dilute acid pretreatment disintegrates the biomass complex and allows cellulolytic enzymes to hydrolyze cellulose and hemicelluloses in releasing fermentable sugars. The current study investigates the effect of different H2SO4 doses (0–2.5%) on the three lignocellulosic feedstock material, especially pinewood, timothy grass, and wheat straw at 121°C for 1 h. Furthermore, the pretreated feedstock was subjected to enzymatic hydrolysis using cellulase, b-glucosidase, and xylanase at 45°C for 72 h.The biomass hydrolysates containing monomeric sugars (glucose and xylose) were fermented using Saccharomyces cerevisiae and Clostridium beijerinckii for ethanol and butanol production, respectively. A comparative evaluation for the
concentrations of ethanol and butanol, residual sugars as well as byproducts such as acetone, acetate, and butyrate from biomass hydrolysates was performed.Pinewood hydrolysate revealed high ethanol (24.1 g/L) and butanol
(11.6 g/L) concentrations due to greater sugar content. In contrast to ethanol fermentation by S. cerevisiae, butanol fermentation by C. beijerinckii demonstrated low butanol levels in the hydrolysates due to butanol toxicity toward
clostridia.

Keywords
Butanol, dilute acid pretreatment, enzymatic hydrolysis, ethanol, fermentation, lignocellulosic biomass

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Ketersediaan

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Informasi Detail

Judul Seri

Energy Science and Engineering

No. Panggil

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Penerbit

: Graduate School of Economics, Waseda University., 2014

Deskripsi Fisik

Energy Science and Engineering 2014; 2(3): 138–148

Bahasa

English

ISBN/ISSN

2014

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

FISIKA

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

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