| On energy consumption for size-reduction and yields from subsequent enzymatic saccharification of pretreated lodgepole pine. | |
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MedLine Citation:
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PMID: 20006490 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study investigated the effects of chemical pretreatment and disk-milling conditions on energy consumption for size-reduction and the efficiency of enzymatic cellulose saccharification of a softwood. Lodgepole pine wood chips produced from thinnings of a 100-year-old unmanaged forest were pretreated by hot-water, dilute-acid, and two SPORL processes (Sulfite Pretreatment to Overcome Recalcitrance of Lignocellulose) at acid charge on oven dry (od) wood of 0% and 2.21%. The pretreated wood chips were then milled using a laboratory disk mill under various solids-loadings and disk-plate gaps to produce substrates for enzymatic hydrolysis. We found that post-chemical-pretreatment size-reduction of forest biomass can decrease size-reduction energy consumption by 20-80% depending on the pretreatment applied under 20% solids-loading and a disk-plate gap of 0.76 mm in milling. SPORL with a sodium bisulfite charge of 8% and sulfuric acid charge of 2.21% on wood was the most effective in decreasing size-reduction energy consumption. Solids-loading had the most significant effect on disk-milling energy. When solids-loading was reduced from 30% to 3%, disk-milling energy could be decreased by more than a factor of 10 for wood chips pretreated by both SPORL and dilute-acid at an acid charge of 2.21%. The enzymatic hydrolysis glucose yields (EHGY) from the substrates produced by all pretreatments were independent of the solids-loading in milling, indicating that these energy savings in size-reduction can be realized without affecting EHGY. When wood chips were pretreated by SPORL with 2.21% acid charge, size-reduction energy consumption was decreased to less than 50 Wh/kg od wood at a practical solids-loading of approximately 10-20%, equivalent to that used in size-reduction of agriculture biomass, with excellent EHGY of about 370 g per kg od wood. Similar effects on size-reduction energy savings and excellent EHGY were also achieved when large disk-plate gaps (up to 1.52 mm studied) were applied in disk-milling of wood chips pretreated by SPORL with acid. |
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Authors:
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W Zhu; J Y Zhu; R Gleisner; X J Pan |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2009-12-16 |
Journal Detail:
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Title: Bioresource technology Volume: 101 ISSN: 1873-2976 ISO Abbreviation: Bioresour. Technol. Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-02-03 Completed Date: 2010-05-03 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9889523 Medline TA: Bioresour Technol Country: England |
Other Details:
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Languages: eng Pagination: 2782-92 Citation Subset: IM |
Copyright Information:
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Published by Elsevier Ltd. |
Affiliation:
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State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Biofuels* Biotechnology / methods* Cellulase / metabolism Chromatography, Ion Exchange Conservation of Energy Resources / methods Hydrolysis Pinus / chemistry* Sulfites / chemistry Sulfuric Acids Wood / metabolism* beta-Glucosidase / metabolism |
| Chemical | |
Reg. No./Substance:
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0/Biofuels; 0/Sulfites; 0/Sulfuric Acids; 7631-90-5/sodium bisulfite; 7664-93-9/sulfuric acid; EC 3.2.1.21/beta-Glucosidase; EC 3.2.1.4/Cellulase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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