Optimization of monosaccharide recovery by post-hydrolysis of the water-soluble hemicellulose component after steam explosion of softwood chips

Shevchenko, S. M.; Chang, Kevin; Robinson, Jamie; Saddler, Jack N.

doi:10.1016/s0960-8524(99)00125-x

Cited by 96 publications

(45 citation statements)

References 12 publications

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“…Previous studies on bagasse or wood materials have generally employed addition of acidic reagents (H 2 SO 4 or SO 2 ) prior to steam disruption so as to achieve acidcatalyzed hydrolysis of cellulosic materials (Morjano and Gray, 1987;Shevchenko et al, 2000). We employed steam disruption of primary digestate at its native neutral pH (7±8), without addition of acid or other agents to aid hydrolysis.…”

Section: Mechanism Of Steam Disruption Enhancement Of Digestionmentioning

confidence: 99%

Steam pressure disruption of municipal solid waste enhances anaerobic digestion kinetics and biogas yield

Liu¹,

Walter²,

Vogt³

et al. 2001

Biotech & Bioengineering

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Biomass waste, including municipal solid waste (MSW), contains lignocellulosic-containing fiber components that are not readily available as substrates for anaerobic digestion due to the physical shielding of cellulose imparted by the nondigestible lignin. Consequently, a substantial portion of the potentially available carbon is not converted to methane and the incompletely digested residues from anaerobic digestion generally require additional processing prior to their return to the environment. We investigated and developed steam pressure disruption as a treatment step to render lignocellulosic-rich biomass more digestible and as a means for increasing methane energy recovery. The rapid depressurization after steam heating (240 degrees C, 5 min.) of the nondigested residues following a 30-day primary digestion of MSW caused a visible disruption of fibers and release of soluble organic components. The disrupted material, after reinoculation, provided a rapid burst in methane production at rates double those observed in the initial digestion. This secondary digestion proceeded without a lag phase in gas production, provided approximately 40% additional methane yields, and was accompanied by a approximately 40% increase in volatile solids reduction. The secondary digestate was found to be enriched in lignin and significantly depleted in cellulose and hemi-cellulose components when compared to primary digestate. Thus, steam pressure disruption treatment rendered lignocellulosic substrates readily accessible to anaerobic digestion bacteria and improved both the kinetics of biogas production and the overall methane yield from MSW. Steam pressure disruption is central to a new anaerobic digestion process approach including sequential digestion stages and integrated energy recovery, to improve process yields, provide cogenerated energy for process needs, and to provide effective reuse and recycling of waste biomass materials.

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Section: Mechanism Of Steam Disruption Enhancement Of Digestionmentioning

confidence: 99%

Steam pressure disruption of municipal solid waste enhances anaerobic digestion kinetics and biogas yield

Liu¹,

Walter²,

Vogt³

et al. 2001

Biotech & Bioengineering

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“…In addition to the physical properties of the pretreated substrates such as surface area, pore size, crystallinity, and degree of polymerization, it has been recognized that the residual lignin, which is inevitably associated with the cellulose after pretreatment and post-treatment, significantly influences subsequent enzymatic hydrolysis (Chandra et al, 2007;Grethlein, 1985;Grous et al, 1986;Mooney et al, 1999;Shevchenko et al, 2000). Lignin is an essential structural component in the plant and is a polymer of phenylpropane units produced through oxidative coupling of 4-hydroxyphenyl propanoid compounds (Humphreys and Chapple, 2002).…”

Section: Introductionmentioning

confidence: 99%

Enhancing the enzymatic hydrolysis of lignocellulosic biomass by increasing the carboxylic acid content of the associated lignin

Nakagame

Chandra

Kadla

et al. 2010

Biotech & Bioengineering

231

137

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To assess the effects that the physical and chemical properties of lignin might have on the enzymatic hydrolysis of pretreated lignocellulosic substrates, protease treated lignin (PTL) and cellulolytic enzyme lignin (CEL) fractions, isolated from steam and organosolv pretreated corn stover, poplar, and lodgepole pine, were prepared and characterized. The adsorption of cellulases to the isolated lignin preparations corresponded to a Langmuir adsorption isotherm. It was apparent that, rather than the physical properties of the isolated lignin, the carboxylic acid functionality of the isolated lignin, as determined by FTIR and NMR spectroscopy, had much more of an influence when lignin was added to typical hydrolysis of pure cellulose (Avicel). An increase in the carboxylic content of the lignin preparation resulted in an increased hydrolysis yield. These results suggested that the carboxylic acids within the lignin partially alleviate non-productive binding of cellulases to lignin. To try to confirm this possible mechanism, dehydrogenative polymers (DHP) of monolignols were synthesized from coniferyl alcohol (CA) and ferulic acid (FA), and these model compounds were added to a typical enzymatic hydrolysis of Avicel. The DHP from FA, which was enriched in carboxylic acid groups compared with the DHP from CA, adsorbed a lower mount of cellulases and did not decrease hydrolysis yields when compared to the DHP from CA, which decreased the hydrolysis of Avicel by 8.4%. Thus, increasing the carboxylic acid content of the lignin seemed to significantly decrease the non-productive binding of cellulases and consequently increased the enzymatic hydrolysis of the cellulose.

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“…The posthydrolysis options can be reduced to acid [7][8][9][10][11][12][13][14] or enzymatic [14][15][16] catalyzed hydrolysis. Acid hydrolysis typically presents both higher yield and productivity when compared to the enzymatic hydrolysis processes.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, this is seldom done. The most studied factors are catalyst concentration, ranging from 0% to 4% [11][12][13][14], reaction time, ranging from 0 to 602 min [12,14], and temperature, ranging from 100.5 to 135°C [12,13]. The optimal conditions identified are dependent on pretreatment type and raw material.…”

Section: Introductionmentioning

confidence: 99%

Dilute Acid Hydrolysis of Wheat Straw Oligosaccharides

Duarte

Silva-Fernandes

Carvalheiro

et al. 2008

Appl Biochem Biotechnol

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The dilute acid posthydrolysis of wheat straw hemicellulosic oligosaccharides obtained by autohydrolysis was evaluated. An empirical model was used to describe the effect of catalyst concentration (sulfuric acid, 0.1-4% w/w) and reaction time (0-60 min) based on data from a Doehlert experimental design. Catalyst concentration is the main variable influencing posthydrolysis performance, as both its linear and quadratic coefficients are statistically significant for the majority of the studied variables, namely, the ones related to sugar and byproducts production. Reaction time influences xylose and furan derivatives concentrations but not phenolics or acetic acid content. Catalyst concentration and reaction time interact synergistically, minimizing sugar recovery and promoting furan derivatives production. Based on the proposed models, it was possible to delimit an operational range that enables to obtain high monosaccharides recovery together with a slight decrease in inhibitors content as compared to the standard acid hydrolysis treatment. Furthermore, this is achieved with up to 70% less acid spending or considerable savings on reaction time.

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Optimization of monosaccharide recovery by post-hydrolysis of the water-soluble hemicellulose component after steam explosion of softwood chips

Cited by 96 publications

References 12 publications

Steam pressure disruption of municipal solid waste enhances anaerobic digestion kinetics and biogas yield

Steam pressure disruption of municipal solid waste enhances anaerobic digestion kinetics and biogas yield

Enhancing the enzymatic hydrolysis of lignocellulosic biomass by increasing the carboxylic acid content of the associated lignin

Dilute Acid Hydrolysis of Wheat Straw Oligosaccharides

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