Alkaline and fungal pretreatments for improving methane potential of Napier grass

Narinthorn, Ruethai; Choorit, Wanna; Chisti, Yusuf

doi:10.1016/j.biombioe.2019.105262

Cited by 23 publications

(17 citation statements)

References 60 publications

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“…These results suggest that a further reduction size of grass with a typical industrial mincer for organic wastes does not improve the kinetics of biogas production. This is in accordance with the study of Narinthorna et al [31], who found no significant differences in methane yields of Pennisetum between sizes of 2−3 cm and <0.6 mm. Additionally, the kinetic behavior (Table 4) analyzed through the Gompertz equation (r 2 = 0.99) showed that the machine chopped method presented the highest Rm.…”

Section: Influence Of the Size Reduction Methods On Specific Methane Yieldssupporting

confidence: 93%

Effect of Harvesting Age and Size Reduction in the Performance of Anaerobic Digestion of Pennisetum Grass

et al. 2020

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In the rural zones of Latin American and Caribbean developing countries, the poorest households rely on traditional fuels such as firewood to meet their daily cooking needs. Many of those countries are located near the equator, where they have a tropical climate and grass is one of the most common biomass crops. The aim of this study was to evaluate the effect of harvesting age (30, 44, and 57 days) in the performance of anaerobic digestion of King Grass (Pennisetum purpureum cv. King Grass) grown under tropical climate conditions. Three reduction methods of crop size were also compared. Results showed that 44-day harvesting age presented the greater specific methane yield (347.8 mLCH4 g−1VS) and area-specific methane yield (9773 m3CH4 ha−1 y−1). The machine chopped method (1–3 cm for stems and 1–10 cm for leaves) was the reduction method that maximized the methane production. From those results, the calculated area required for grass cultivation to provide the cooking energy to a typical family in the Colombian rural zones is 154 m2.

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Section: Influence Of the Size Reduction Methods On Specific Methane Yieldssupporting

confidence: 93%

Effect of Harvesting Age and Size Reduction in the Performance of Anaerobic Digestion of Pennisetum Grass

et al. 2020

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“…However, the utilisation of biomass resources for electricity, biofuel, or biogas generation has not been extensively utilised or studied in most African countries [9][10][11]. From the different lignocellulosic materials currently available in Nigeria, Napier grass has been reported to be a particularly attractive feedstock for production of biofuels and bio-based products mainly due to its high cellulose content (34.2-40%), high yields per unit area, tolerance to drought, and a good water use efficiency (ratio of water used by the crop to water lost by evapotranspiration) [12][13][14][15][16][17].Napier grass is a perennial C4 plant endemic to Sub-Saharan Africa with a high heating value biomass (16.58 MJ/kg) [18]. This crop is mainly used to feed cattle, but it can also be used for grazing, silage, or hay production or fish food [15].…”

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confidence: 99%

“…At 5% total solids, the authors obtained the highest kinetics rate for biogas production and concluded that this feedstock can be grown for this purpose. Narinthorn et al [13] also investigated the biomethane potential of Napier grass. For this, the authors applied combined alkaline and biological pretreatment methods as a strategy to enhance biomethane yields from Napier grass.…”

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confidence: 99%

Bioenergy Yields from Sequential Bioethanol and Biomethane Production: An Optimized Process Flow

et al. 2019

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This study investigates the potential of different stages of the bioethanol production process (pretreatment, hydrolysis, and distillation) for bioethanol and biomethane production, and studies the critical steps for the liquid and the solid fractions to be separated and discarded to improve the efficiency of the production chain. For this, Napier grass (a fast-growing grass) from Effurun town of Delta State in Nigeria was used and the novel pretreatment method, nitrogen explosive decompression (NED), was applied at different temperatures. The results show that the lowest glucose (13.7 g/L) and ethanol titers (8.4 g/L) were gained at 150 • C. The highest glucose recovery (31.3 g/L) was obtained at 200 • C and the maximum ethanol production (10.3 g/L) at 170 • C. Methane yields are higher in samples pretreated at lower temperatures. The maximum methane yields were reported in samples from the solid fraction of post-pretreatment (pretreated at 150 • C, 1.13 mol CH4/100 g) and solid fraction of the post-hydrolysis stage (pretreated at 150 • C, 1.00 mol CH4/100 g). The lowest biomethane production was noted in samples from the liquid fraction of post-pretreatment broth (between 0.14 mol CH4/100 g and 0.24 mol CH4/100 g). From the process point of view, samples from liquid fraction of post-pretreatment broth should be separated and discarded from the bioethanol production process, since they do not add value to the production chain. The results suggest that bioethanol and biomethane concentrations are influenced by the pretreatment temperature. Napier grass has potential for bioethanol and further biomethane production and it can be used as an alternative source of energy for the transportation sector in Nigeria and other countries rich in grasses and provide energy security to their population.alternative sources of energy that will decrease the share of fossil fuels utilised in the transportation sector and productive uses, reduce environmental concerns caused by the extensive utilization of these resources (e.g., climate change and global warming), increase energy security, and improve the access of the population to electricity. Renewable energy sources from lignocellulosic biomass have been reported as promising solutions to these problems [4]. Nowadays, biomass itself is responsible for 10% primary energy consumption worldwide [5] and it can be used as a promising feedstock for biofuel production. The sustainability of wastes and by-products as a biofuel for the transportation sector in a circular economy has been studied in the literature, in order to make the biogas-biomethane chain more sustainable [6][7][8]. These studies show the positive impact of biofuels in the transportation section in Europe. However, further research needs to be done in order to apply circular economy models to emerging economies.Sub-Saharan Africa has great potential to develop renewable energy sources, such as wind, biomass, solar, and hydro. Just in Nigeria, the biomass potential is about 144 million tonnes per year and the potenti...

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“…The weight loss of the wheat straw was due to the dissolution of components such as cellulose, hemicellulose and lignin. 42,43 The cellulose, hemicellulose and lignin contents of the raw wheat straw samples were 38.8%, 27.9% and 20.1%, respectively. The levels of the three substances in the samples subjected to direct enzymatic hydrolysis and in the samples pretreated with CaO 2 did not change signicantly, whereas the heat and CaO 2 co-pretreatment was more effective in degrading hemicellulose to obtain soluble oligomers and monomeric sugars, and also in removing lignin, which was consistent with previous work.…”

Section: Effects Of Cao 2 /Cellulase Pretreatment On the Hydrolysis Productsmentioning

confidence: 99%

Methane production from wheat straw pretreated with CaO₂/cellulase

Zhang

Kong

et al. 2021

RSC Adv.

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Alkaline and fungal pretreatments for improving methane potential of Napier grass

Cited by 23 publications

References 60 publications

Effect of Harvesting Age and Size Reduction in the Performance of Anaerobic Digestion of Pennisetum Grass

Effect of Harvesting Age and Size Reduction in the Performance of Anaerobic Digestion of Pennisetum Grass

Bioenergy Yields from Sequential Bioethanol and Biomethane Production: An Optimized Process Flow

Methane production from wheat straw pretreated with CaO₂/cellulase

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Alkaline and fungal pretreatments for improving methane potential of Napier grass

Cited by 23 publications

References 60 publications

Effect of Harvesting Age and Size Reduction in the Performance of Anaerobic Digestion of Pennisetum Grass

Effect of Harvesting Age and Size Reduction in the Performance of Anaerobic Digestion of Pennisetum Grass

Bioenergy Yields from Sequential Bioethanol and Biomethane Production: An Optimized Process Flow

Methane production from wheat straw pretreated with CaO2/cellulase

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Product

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Methane production from wheat straw pretreated with CaO₂/cellulase