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Bioresour Technol. 2013 Oct;145:275-9. doi: 10.1016/j.biortech.2013.02.080. Epub 2013 Mar 5.

Pretreatment and hydrolysis methods for recovery of fermentable sugars from de-oiled Jatropha waste.

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1
Department of Environmental Engineering and Science, Feng Chia University, Taichung 40724, Taiwan.

Abstract

The release of reducing sugars (RS) upon various pretreatments and hydrolysis methods from de-oiled Jatropha waste (DJW) was studied. The highest RS concentration of 12.9 g/L was observed at 10% enzyme hydrolysis. The next highest RS of 8.0 g/L and 7.8 g/L were obtained with 10% HCl and 2.5% H2SO4, respectively. The NaOH (2.5%), ultrasonication and heat (90°C for 60 min) treatments showed the RS concentration of 2.5 g/L, 1.1 g/L and 2.0 g/L, respectively. Autoclave treatment slightly enhanced the sugar release (0.9 g/L) compared to no treatment (0.7 g/L). Glucose release (11.4 g/L) peaked in enzyme hydrolysis. Enzyme treated acid unhydrolysed biomass showed 11.1 g/L RS. HCl and H2SO4 pretreatment gave maximal xylose (6.89 g/L and 6.16 g/L, respectively). Combined (acid and enzyme) hydrolysis employed was efficient and its subsequent batch hydrogen fermentation showed a production 3.1 L H2/L reactor.

KEYWORDS:

Acid treatment; Alkali treatment; Enzyme hydrolysis; Hydrogen fermentation; Reducing sugars

PMID:
23562180
DOI:
10.1016/j.biortech.2013.02.080
[Indexed for MEDLINE]
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