Anaerobic fermentation of woody biomass treated by various methods

Nakamura, Yoshitoshi; Mtui, Godliving Y. S.

doi:10.1007/bf02935893

Cited by 31 publications

(8 citation statements)

References 14 publications

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“…Initially, the ability of digesting the forest materials without any sort of treatment was evaluated. Despite the fact that high methane yields from untreated agricultural residues have been demonstrated ( Bauer et al, 2009 ; Lei et al, 2010 ), forest residues are considered to be ‘tougher’ raw materials, and for this reason the yields obtained from untreated materials are often very low ( Nakamura and Mtui, 2003 ; Yoshida et al, 2010 ). Similar (low) results for methane yield were also obtained during this work when untreated materials were used reaching a highest value of 17.5 ± 1.9 mL CH 4 /g VS when birch was used ( Figure 1 ).…”

Section: Discussionmentioning

confidence: 99%

“…Lignocellulosic materials have low digestibility and the methane yields are therefore low, making a pretreatment step prior to digestion necessary. Different kinds of pretreatments have been evaluated in order to improve the methane yield from forest biomass, such as steam explosion ( Nakamura and Mtui, 2003 ; Horn et al, 2011 ), ionic liquids ( Teghammar et al, 2012 ; Kabir et al, 2014 ), organosolv ( Kabir et al, 2015 ), and supercritical water ( Yoshida et al, 2010 ). On the other hand, pretreatment could result in the degradation of sugars and generation of inhibitory compounds that could hinder the anaerobic digestion.…”

Section: Introductionmentioning

confidence: 99%

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Sequential parametric optimization of methane production from different sources of forest raw material

Μάτσακας

Christakopoulos

2015

Front. Microbiol.

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The increase in environmental problems and the shortage of fossil fuels have led to the need for action in the development of sustainable and renewable fuels. Methane is produced through anaerobic digestion of organic materials and is a biofuel with very promising characteristics. The success in using methane as a biofuel has resulted in the operation of several commercial-scale plants and the need to exploit novel materials to be used. Forest biomass can serve as an excellent candidate for use as raw material for anaerobic digestion. During this work, both hardwood and softwood species—which are representative of the forests of Sweden—were used for the production of methane. Initially, when untreated forest materials were used for the anaerobic digestion, the yields obtained were very low, even with the addition of enzymes, reaching a maximum of only 40 mL CH4/g VS when birch was used. When hydrothermal pretreatment was applied, the enzymatic digestibility improved up to 6.7 times relative to that without pretreatment, and the yield of methane reached up to 254 mL CH4/g VS. Then the effect of chemical/enzymatic detoxification was examined, where laccase treatment improved the methane yield from the more harshly pretreated materials while it had no effect on the more mildly pretreated material. Finally, addition of cellulolytic enzymes during the digestion improved the methane yields from spruce and pine, whereas for birch separate saccharification was more beneficial. To achieve high yields in spruce 30 filter paper units (FPU)/g was necessary, whereas 15 FPU/g was enough when pine and birch were used. During this work, the highest methane yields obtained from pine and birch were 179.9 mL CH4/g VS and 304.8 mL CH4/g VS, respectively. For mildly and severely pretreated spruce, the methane yields reached 259.4 mL CH4/g VS and 276.3 mL CH4/g VS, respectively. We have shown that forest material can serve as raw material for efficient production of methane. The initially low yields from the untreated materials were significantly improved by the introduction of a hydrothermal pretreatment. Moreover, enzymatic detoxification was beneficial, but mainly for severely pretreated materials. Finally, enzymatic saccharification increased the methane yields even further.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sequential parametric optimization of methane production from different sources of forest raw material

Μάτσακας

Christakopoulos

2015

Front. Microbiol.

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“…After the pretreatments for 15 h, methane productions of 0.125 and 0.245 Nm 3 CH 4 /kg raw materials were obtained from spruce chips and milled spruce, respectively. Nakamura and Mtui (2003) applied steam explosion, pretreatment on wood chips (Eucalyptus globules) at pressure of 25 atm and steaming time of 3 min. The obtained methane yield after the steam explosion treatment was 0.194 m 3 CH 4 /kg TS, while only 0.014 m 3 /kg TS methane was produced from the untreated material.…”

Section: Anaerobic Digestion Of Woody Biomassmentioning

confidence: 99%

Biogas from Lignocellulosic Materials

Kabir

Forgács

Horváth

2015

Lignocellulose-Based Bioproducts

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Methane production via anaerobic digestion is a steadily growing industry in Europe and all over the world. Biomethane reduces the demand for fossil fuels, since it can be used for the production of power and heat or converted to vehicle fuel. Anaerobic digestion is a renewable energy technology; however, it can also be considered as a low-cost environmental-friendly waste management process, since it reduces the emission of greenhouse gases (GHGs), while it stabilizes the wastes. Currently, mainly the organic fraction of household waste, food waste, sewage sludge, manure, and energy crops is used for biogas production; nevertheless, there are a wide range of other organic substrates which can be utilized for biogas production. Among the organic matters, lignocellulosic materials have a great potential. Great abundance worldwide and carbohydrate-rich contents make them an attractive feedstock for biofuel production. Currently, anaerobic digestion of energy crops is widespread; however, biogas production from lignocellulosic residuals and wastes is still under investigation. This chapter focuses on anaerobic digestion of lignocellulosic materials. It explains the anaerobic digestion process and the current technologies used for crops digestion. It also summarizes the biogas potential of different lignocellulosic materials and the latest research on pretreatments to improve the methane yield. Finally, this chapter compares anaerobic digestion of lignocellulosic materials with energy production from these kinds of materials through thermochemical processes.

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“…After the pretreatments et al (2010) for 15 h, methane productions of 0.125 and 0.245 Nm 3 CH 4 /kg raw materials were obtained from spruce chips and milled spruce, respectively. Nakamura and Mtui (2003) applied steam explosion, pretreatment on wood chips (Eucalyptus globules) at pressure of 25 atm and steaming time of 3 min. The obtained methane yield after the steam explosion treatment was 0.194 m 3 CH 4 /kg TS, while only 0.014 m 3 /kg TS methane was produced from the untreated material.…”

Section: Anaerobic Digestion Of Woody Biomassmentioning

confidence: 99%

Lignocellulose-Based Bioproducts

2015

Biofuel and Biorefinery Technologies

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Anaerobic fermentation of woody biomass treated by various methods

Cited by 31 publications

References 14 publications

Sequential parametric optimization of methane production from different sources of forest raw material

Sequential parametric optimization of methane production from different sources of forest raw material

Biogas from Lignocellulosic Materials

Lignocellulose-Based Bioproducts

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