Document Detail


On energy consumption for size-reduction and yields from subsequent enzymatic saccharification of pretreated lodgepole pine.
MedLine Citation:
PMID:  20006490     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
W Zhu; J Y Zhu; R Gleisner; X J Pan
Publication Detail:
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:
Title:  Bioresource technology     Volume:  101     ISSN:  1873-2976     ISO Abbreviation:  Bioresour. Technol.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-02-03     Completed Date:  2010-05-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9889523     Medline TA:  Bioresour Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  2782-92     Citation Subset:  IM    
Copyright Information:
Published by Elsevier Ltd.
Affiliation:
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
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MeSH Terms
Descriptor/Qualifier:
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:
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

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