A novel cost-effective technology to convert sucrose and homocelluloses in sweet sorghum stalks into ethanol

Li, Jihong; Li, Shizhong; Han, Bing; Yu, Miao; Li, Guangming; Jiang, Yan

doi:10.1186/1754-6834-6-174

Cited by 72 publications

(31 citation statements)

References 32 publications

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“…Estimates of juice ethanol yield (JEY) were calculated using the conversion factor of 0.08 × 1.76 kg sugar per L of ethanol (Putnam et al, 1991; Smith et al, 1987). The lignocellulosic ethanol yield from bagasse (LEY) was estimated via the conversion factor from Li et al (2013), namely 415 L EtOH Mg −1 bagasse dry matter.…”

Section: Methodsmentioning

confidence: 99%

Nitrogen Content and Use Efficiency of Sweet Sorghum Grown in the Lower Midwest

2019

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Optimizing N fertilizer inputs is imperative for improving sweet sorghum [Sorghum bicolor (L.) Moench] yields and biofuel feedstock system efficiency. A 2‐yr study was conducted to determine the physiological N‐use efficiency (NUE) response in sweet sorghum's ethanol yield of stem juice, bagasse, and total ethanol yield (TEY). Two sweet sorghum cultivars (‘Dale’ and ‘Top 76–6’) were fertilized at five N fertilizer rates (0, 56, 112, 168, and 224 kg ha−1). At harvest, the stem juice and bagasse yields were measured then analyzed for the corresponding N concentrations and N contents. Whole‐plant N recovery efficiency ranged from −1.5 to 57.6% across both years, with a significant N rate effect only in one study year. The NUE of juice ethanol yield only demonstrated an N response in the second year, whereas the NUE of lignocellulosic ethanol yield was greatest at the 56 kg ha−1 fertilizer rate each year. The NUE of total theoretical ethanol yield, determined as the sum of juice and bagasse conversion to ethanol, averaged 169 L EtOH kg−1 N across both years and was greatest at the 56 kg N ha−1 fertilizer rate in both years, and decreased at N rates exceeding 56 kg ha−1 in only one of the years. This study revealed that although sweet sorghum ethanol yields increased with N fertilizer application, NUE was greatest with low N fertilizer rates, consistent with previous research indicating that sweet sorghum is an appropriate biofuel feedstock for production in low‐input systems or on marginal lands. Core Ideas Nitrogen recovery and use efficiencies of sweet sorghum juice and bagasse were measured for two years in Missouri. Nitrogen recovery efficiency was greatest in one study year when 224 kg N ha−1 was applied, with no differences in recovery in the second year. The N use efficiency of estimated total ethanol yield was greatest at 56 kg N ha−1.

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Section: Methodsmentioning

confidence: 99%

Nitrogen Content and Use Efficiency of Sweet Sorghum Grown in the Lower Midwest

2019

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“…There are several reports on the pretreatment of SSB employing dilute acid [42,43], SO 2 [16,44], alkali [45,46], lime [43], ammonia [28], and liquid hot water treatment [47][48][49]; two of them [47,50] are more relevant to the present studies. In these two reports, the authors used acetic acid pretreatment followed by SSB hydrolysis and fermentation to butanol [47,50].…”

Section: Comparison Of Reactor Productivities At High Sweet Sorghum Bmentioning

confidence: 97%

Cellulosic Butanol (ABE) Biofuel Production from Sweet Sorghum Bagasse (SSB): Impact of Hot Water Pretreatment and Solid Loadings on Fermentation Employing Clostridium beijerinckii P260

et al. 2016

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A novel butanol fermentation process was developed in which sweet sorghum bagasse (SSB) was pretreated using liquid hot water (LHW) pretreatment technique followed by enzymatic hydrolysis and butanol (acetone butanol ethanol (ABE)) fermentation. A pretreatment temperature of 200°C resulted in the generation of a hydrolyzate that inhibited butanol fermentation. When SSB pretreatment temperature was decreased to 190°C (0-min holding time), the hydrolyzate was successfully fermented without inhibition and an ABE productivity of 0.51 g L −1 h −1 was achieved which is comparable to the 0.49 g L −1 h −1 observed in the control fermentation where glucose was used as a feedstock. These results are based on the use of 86 g L −1 SSB solid loadings in the pretreatment reactors. We were also able to increase SSB solid loadings from 120 to 200 g L −1 in the pretreatment step (190°C) followed by hydrolysis and butanol fermentation. As pretreatment solid loadings increased, ABE yield remained in the range of 0.38-0.46. In these studies, a maximum ABE concentration of 16.88 g L −1 was achieved.Using the LHW pretreatment technique, 88.40-96.00 % of polymeric sugars (cellulose + hemicellulose) were released in the SSB hydrolyzate. The LHW pretreatment technique does not require chemical additions and is environmentally friendly, and the hydrolyzate can be used successfully for butanol fermentation.

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“…It is well adapted to various types of soils and provides high production biomass production [14]. The stalks of sweet sorghum may obtain 8%-23% sugar content, depending on varieties and cropping seasons, and yield >100 tons ha −1 with high lignocellulose [15,16]. The use of cassava and maize for ethanol production has increased the world's staple prices and is a matter of social controversy, as many developing countries are facing a food shortage problem.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sowing Times, Densities, and Soils to Biomass and Ethanol Yield of Sweet Sorghum

Xuan

Phuong²,

Khang³

et al. 2015

Sustainability

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Abstract:The use of biofuels helps to reduce the dependency on fossil fuels and therefore decreases CO2 emission. Ethanol mixed with gasoline in mandatory percentages has been used in many countries. However, production of ethanol mainly depends on food crops, commonly associated with problems such as governmental policies and social controversies. Sweet sorghum (Sorghum bicolor (L.) Moench) is one of the most potential and appropriate alternative crops for biofuel production because of its high biomass and sugar content, strong tolerance to environmental stress conditions and diseases, and wide adaptability to various soils and climates. The aim of this study was to select prospective varieties of sweet sorghum, optimum sowing times and densities to achieve high yields of ethanol production and to establish stable operational conditions in cultivating this crop. The summer-autumn cropping season combined with the sowing densities of 8.3-10.9 plant m −2

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A novel cost-effective technology to convert sucrose and homocelluloses in sweet sorghum stalks into ethanol

Cited by 72 publications

References 32 publications

Nitrogen Content and Use Efficiency of Sweet Sorghum Grown in the Lower Midwest

Nitrogen Content and Use Efficiency of Sweet Sorghum Grown in the Lower Midwest

Cellulosic Butanol (ABE) Biofuel Production from Sweet Sorghum Bagasse (SSB): Impact of Hot Water Pretreatment and Solid Loadings on Fermentation Employing Clostridium beijerinckii P260

Influence of Sowing Times, Densities, and Soils to Biomass and Ethanol Yield of Sweet Sorghum

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