Lime pretreatment of crop residues bagasse and wheat straw
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 degrees C) were required...
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Published in | Applied biochemistry and biotechnology Vol. 74; no. 3; pp. 135 - 159 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Heidelberg
Springer
01.09.1998
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | 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 degrees C) were required to achieve high sugar yields, whereas for long pretreatment times (e.g., 24 h), low temperatures (50-65 degrees 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 |
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Bibliography: | 1999004167 P06 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0273-2289 1559-0291 |
DOI: | 10.1007/bf02825962 |