Hydrothermolysis of Birch Wood as Pretreatment for Enzymatic Saccharification

Hörmeyer, H. F.; Schwald, W.; Bonn, Günther K.; Bobleter, O.

doi:10.1515/hfsg.1988.42.2.95

Cited by 53 publications

(17 citation statements)

References 10 publications

(9 reference statements)

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“…Suitability of individual processes depends on rice straw composition and microorganism involved in fermentation. Various hydrolysis techniques involved in rice straw hydrolysis include high pressure steaming, alkaline hydrolysis, hydrogen peroxide treatment [19], hydrothermal treatment [20], and steam explosion. In addition to these, several other methods such as biologically based hydrolysis processes, ammonia fiber explosion, and hot water treatment too have been carried out [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Ethanol production from rice straw using thermotolerant Kluyveromyces sp. IIPE453

Jain

Ghosh

Agrawal

et al. 2014

Biomass Conv. Bioref.

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Present paper describes a process development for fractionation of holocellulose in rice straw into its monomeric sugars employing acid hydrolysis followed by enzymatic saccharification. Rice straw has been hydrolyzed at 140°C and 0.6 % v/v dilute sulfuric acid with 90 min holding time for maximum recovery of pentose monomer (12.52 g xylose/ 100 g biomass). Pentose stream was used for yeast cell biomass generation. Commercial cellulase resulted in 79±0.05 % saccharification efficiency with acid-hydrolyzed biomass. Fermentation of saccharified broth using thermophilic yeast Kluyveromyces sp. IIPE453 (MTCC 5314) with cell recycle produced ethanol with an overall yield and productivity of 93.5±0.05 % and 0.90±0.2 g/L/h, respectively, and with negligible residual sugar in fermentation broth. Lignin-rich residual biomass had a high gross calorific value and could be used as a source of clean gaseous fuel.

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Section: Introductionmentioning

confidence: 99%

Ethanol production from rice straw using thermotolerant Kluyveromyces sp. IIPE453

Jain

Ghosh

Agrawal

et al. 2014

Biomass Conv. Bioref.

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“…This is accomplished partly by solubilization of the hemicelluloses and partly by degradation of the lignin. The pre-treatments are: Milling and grinding, pyrolysis, high-energy radiation, high pressure steaming, alkaline or acid hydrolysis, hydrogen peroxide treatment, hydrothermal treatment, steam explosion, wet oxidation and biological treatment such as enzyme or microbial conversion: (Fan et al , 1982; McGinnis et al , 1983; Hormeyer et al , 1988; Olson and Hahn-Hagerdahl, 1997; Bollok 1999; Soni et al , 2010). …”

Section: Introductionmentioning

confidence: 99%

Bioethanol production from rice straw residues

Belal¹

2013

Braz. J. Microbiol.

126

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A rice straw - cellulose utilizing mold was isolated from rotted rice straw residues. The efficient rice straw degrading microorganism was identified as Trichoderma reesei. The results showed that different carbon sources in liquid culture such as rice straw, carboxymethyl cellulose, filter paper, sugar cane bagasse, cotton stalk and banana stalk induced T. reesei cellulase production whereas glucose or Potato Dextrose repressed the synthesis of cellulase. T. reesei cellulase was produced by the solid state culture on rice straw medium. The optimal pH and temperature for T. reesei cellulase production were 6 and 25 °C, respectively. Rice straw exhibited different susceptibilities towards cellulase to their conversion to reducing sugars. The present study showed also that, the general trend of rice straw bioconversion with cellulase was more than the general trend by T. reesei. This enzyme effectively led to enzymatic conversion of acid, alkali and ultrasonic pretreated cellulose from rice straw into glucose, followed by fermentation into ethanol. The combined method of acid pretreatment with ultrasound and subsequent enzyme treatment resulted the highest conversion of lignocellulose in rice straw to sugar and consequently, highest ethanol concentration after 7 days fermentation with S. cerevisae yeast. The ethanol yield in this study was about 10 and 11 g.L−1.

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“…This is accomplished partly by solubilization of the hemicelluloses and partly by degradation of the lignin. The pre-treatments are: Milling and grinding, pyrolysis, high-energy radiation, high pressure steaming, alkaline or acid hydrolysis, gas treatment (chlorine dioxide, nitrogen dioxide, sulfur dioxide, ozone), hydrogen peroxide treatment, organic solvent treatment, hydrothermal treatment, steam explosion, wet oxidation and biological treatment (Fan et al, 1982;Hormeyer et al, 1988;McGinnis et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Bioethanol Production from Rice Straw

Yoswathana¹,

Phuriphipat²,

Treyawutthiwat³

et al. 2010

Energy Research Journal

101

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Problem statement: Rice straw has been treated with different chemical (acid, alkali) and physical (subcritical water, ultrasound) methods to convert lignocellulose material to sugar. In addition enzyme treatment of pretreated samples has been applied to improve the conversion of lignocellulose material in sugar. Approach: Sulfuric acid at concentration of 1-9% was applied for acid treatment. For alkali treatment was sodium hydroxide solution at concentration of 1-5% used. Subcritical water treatment carried out at 160°C (5 bar) and 200°C (15 bar) for 10 min. Ultrasound was applied as combination method after acid pretreatment. The condition during ultrasound treatment was 40 W at 50°C and 10 min. Finally the pretreated sample was fermented using Saccharomyces cerevisiae yeast and the amount of produced ethanol was measured. Results: Acid treatment at 121°C, 15 min is an effective pretreatment method for converting lignocellulose to sugar. Up to 21.45% sugar w/w could be measure after acid treatment. Combination of chemical pretreatment and subsequent enzyme treatment increased the sugar yield drastically. Up to 37 and 28% sugar w/w could be achieved for acid and alkali pretreated samples respectively. Subcritical Water (SCW) treatment method is an effective physical method. SCW treatment at 200°C and 10 min followed by enzyme treatment yielded up to 17% sugar w/w. Combination of acid pretreatment with ultrasonic before enzyme treatment increased the conversion of lignocelluloses to sugar. Sugar yield up to 44% w/w after combination of acid and ultrasonic pretreatment and subsequent enzyme treatment could be achieved. Fermentation of pretreated rice straw shown that after 3 days fermentation most of sugar (55-65%) will be converted to bioethanol. The remaining sugar could not be converted in ethanol even after 6 days fermentation. Under these conditions, the maximum ethanol of 1.69% (v/v) was obtained. Conclusion: The combination method of acid pretreatment combined with ultrasound and subsequent enzyme treatment result the highest conversion of lignocelluse in rice straw to sugar and consequently, highest ethanol concentration after 6 days fermentation with S. cerevisae yeast.

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Hydrothermolysis of Birch Wood as Pretreatment for Enzymatic Saccharification

Cited by 53 publications

References 10 publications

Ethanol production from rice straw using thermotolerant Kluyveromyces sp. IIPE453

Ethanol production from rice straw using thermotolerant Kluyveromyces sp. IIPE453

Bioethanol production from rice straw residues

Bioethanol Production from Rice Straw

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