Lime pretreatment of crop residues bagasse and wheat straw View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1998-09

AUTHORS

Vincent S. Chang, Murlidhar Nagwani, Mark T. Holtzapple

ABSTRACT

Lime (calcium hydroxide) was used as a pretreatment agent to enhance the enzymatic digestibility of two common crop residues: bagasse and wheat straw. A systematic study of pretreatment conditions suggested that for short pretreatment times (1–3 h), high temperatures (85-135°C) were required to achieve high sugar yields, whereas for long pretreatment times (e.g., 24 h), low temperatures (50–65°C) were effective. The recommended lime loading is 0.1 g Ca(OH)2/g dry biomass. Water loading had little effect on the digestibility. Under the recommended conditions, the 3-d reducing sugar yield of the pretreated bagasse increased from 153 to 659 mg Eq glucose/g dry biomass, and that of the pretreated wheat straw increased from 65 to 650 mg Eq glucose/g dry biomass. A material balance study on bagasse showed that the biomass yield after lime pretreatment is 93.6%. No glucan or xylan was removed from bagasse by the pretreatment, whereas 14% of lignin became solubilized. A lime recovery study showed that 86% of added calcium was removed from the pretreated bagasse by ten washings and could be recovered by carbonating the wash water with CO2 at pH 9.5. More... »

PAGES

135-159

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02825962

DOI

http://dx.doi.org/10.1007/bf02825962

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1009631483


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