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Title: Impact of Thermal Pretreatment Temperatures on Woody Biomass Chemical Composition, Physical Properties and Microstructure

Authors:
;
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1419428
Report Number(s):
NETL-PUB-21616
Journal ID: ISSN 1996-1073; ENERGA; PII: en11010025
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Energies (Basel)
Additional Journal Information:
Journal Name: Energies (Basel); Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 1996-1073
Publisher:
MDPI AG
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; 09 BIOMASS FUELS; 36 MATERIALS SCIENCE; 42 ENGINEERING; pyrolysis; chemical composition; micro-structure; physical properties; scanning electron microscopy; wood; thermal pretreatment; torrefaction

Citation Formats

Wang, Ping, and Howard, Bret H. Impact of Thermal Pretreatment Temperatures on Woody Biomass Chemical Composition, Physical Properties and Microstructure. United States: N. p., 2017. Web. doi:10.3390/en11010025.
Wang, Ping, & Howard, Bret H. Impact of Thermal Pretreatment Temperatures on Woody Biomass Chemical Composition, Physical Properties and Microstructure. United States. doi:10.3390/en11010025.
Wang, Ping, and Howard, Bret H. 2017. "Impact of Thermal Pretreatment Temperatures on Woody Biomass Chemical Composition, Physical Properties and Microstructure". United States. doi:10.3390/en11010025. https://www.osti.gov/servlets/purl/1419428.
@article{osti_1419428,
title = {Impact of Thermal Pretreatment Temperatures on Woody Biomass Chemical Composition, Physical Properties and Microstructure},
author = {Wang, Ping and Howard, Bret H.},
abstractNote = {},
doi = {10.3390/en11010025},
journal = {Energies (Basel)},
number = 1,
volume = 11,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
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  • Recent studies have shown high bioconversion efficiencies without pretreatment from woody biomass. Methane yields of approximately 0.3 std m/sup 3//kg* (55% organic conversion efficiencies) have been achieved from select woody substrates (hybrid poplar and sycamore) at long solids residence times, indicating that anaerobic digestion may be a technically feasible process for the production of methane from wood. Physical and chemical pretreatment processes were examined for their ability to further improve wood biodegradability toward developing an effective biomass-conversion process. Physical treatment consisted of mechanical size reduction of hybrid poplar feed using an Urschell mill and a wet-extrusion milling technique resulting inmore » particle sizes ranging from 0.003 to 8 mm. Methane yields did not differ significantly over the particle-size range tested; however, an increase in the methane production rate was observed as the particle size decreased. Chemical treatment consisted of treating cottonwood, hybrid poplar, and sycamore with 5% and 50% sodium hydroxide per gram feed volatile solids in closed containers for 2-1/2 hours at 100/sup 0/C. Following pretreatment, batch bioassays were performed to evaluate the effectiveness of the treatments on the methane yields and production rates from these feeds. Sodium hydroxide pretreatment resulted in a significant increase in the methane yield from cottonwood (approximately 32 to 43%), with smaller increases observed from hybrid poplar and sycamore (5 to 10%). Increased methane production rates, however, resulted for all three species, because only 12 to 14 days were necessary to achieve similar bioconversion efficiencies requiring up to 60 days solids retention times without treatment.« less
  • One of the major challenges associated with algal biofuels production in a biorefinery-type setting is improving biomass utilization in its entirety, increasing the process energetic yields and providing economically viable and scalable co-product concepts. We focus on the impact of compositional characteristics of biomass on the susceptibility to pretreatment in order to maximize the valorization of algal biomass conversion for biofuels and bioproducts. The release of monomeric carbohydrates in the aqueous phase and extractability of the lipid fraction was measured based a response surface methodology to find significant explanatory variables and interaction terms. We studied the effect of harvest timingmore » on the conversion yields, using three algal strains; Chlorella vulgaris and Scenedesmus acutus and Nannochloropsis granulata representing three different nutritional metabolic phases. Four cultivation conditions of high (≥ 90 gallon gasoline equivalent/ton biomass) value for a combined sugar- and lipid-based biofuels process were identified. These four conditions represent either mid or late stage harvest cultivation regimes. Lastly, the results indicate that acid pretreatment has potential to be applicable for a vast range of biomass samples to obtain high energy yields, but that the exact conditions and optima are dependent on the strain and likely the starting composition of the biomass.« less
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  • One of the major challenges associated with algal biofuels production in a biorefinery-type setting is improving biomass utilization in its entirety, increasing the process energetic yields and providing economically viable and scalable co-product concepts. We focus on the impact of compositional characteristics of biomass on the susceptibility to pretreatment in order to maximize the valorization of algal biomass conversion for biofuels and bioproducts. The release of monomeric carbohydrates in the aqueous phase and extractability of the lipid fraction was measured based a response surface methodology to find significant explanatory variables and interaction terms. We studied the effect of harvest timingmore » on the conversion yields, using three algal strains; Chlorella vulgaris and Scenedesmus acutus and Nannochloropsis granulata representing three different nutritional metabolic phases. Four cultivation conditions of high (≥ 90 gallon gasoline equivalent/ton biomass) value for a combined sugar- and lipid-based biofuels process were identified. These four conditions represent either mid or late stage harvest cultivation regimes. Lastly, the results indicate that acid pretreatment has potential to be applicable for a vast range of biomass samples to obtain high energy yields, but that the exact conditions and optima are dependent on the strain and likely the starting composition of the biomass.« less
  • Impact of engineered lignin composition on biomass recalcitrance.