Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"ethanol yield"”.
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Increasing dry grind ethanol yield through fiber pretreatment after liquefaction
… dry grind process, starch is converted to ethanol; whereas, corn fiber remains unconverted. Corn fiber contains 12 to 18% cellulose and 11 to 23% starch which can be hydrolyzed and fermented into ethanol. Conversion of corn fiber into ethanol would lead to an increase in ethanol yield, …
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Effect of irrigation on grain sorghum ethanol yield and sorghum mutants on biomass composition
… strategies on sorghum grain attributes and bioethanol production, and 2) to evaluate the potential fermentable sugar yield of pedigreed sorghum mutants. Results showed that average kernel weight and test weight of grain sorghum increased as irrigation capacity increased, whereas kernel hardness …
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Effects of Biosolids Application and Harvest Frequency on Switchgrass Yield, Feedstock Quality, and Theoretical Ethanol Yield
… the effects of biosolids application on biomass yield, nitrogen (N) concentration, feedstock quality and theoretical ethanol yield (TEY) are rarely reported in the literature. The objectives of this research were: 1) to compare the effects of biosolids application on biomass yield, N …
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Optimization of the production of bioethanol from duckweed (Lemna minor)
… project has investigated the production of bioethanol from duckweed (Lemna minor) biomass. The project includes four main sections: firstly, analysis of the chemical characteristics of duckweed, particularly the polysaccharides of the cell wall; secondly, exploration of suitable commercial …
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Genetic, agronomic and compositional characterization of brown midrib sweet sorghum lignocellulosic biomass for ethanol production
… stem sugar concentration) and quantity (biomass yield, plant height, plant maturity, etc.) biomass traits are key contributors to ethanol yield and production. In this study, a 236 sorghum recombinant inbred line (RIL) population was subjected to genetic, agronomic and compositional …
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Design of a Saccharomyces cerevisiae strain capable of simultaneously utilizing cellobiose and xylose
… utilized as a platform microorganism for bioethanol production from lignocelluloses. However, glucose repression limits efficient ethanol production because glucose in lignocellulosic hydrolysates inhibits xylose and other sugars’ utilization. As a result, it is attractive to construct a …
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Two-stage acidic-alkaline pretreatment of Miscanthus for bioethanol production
Pretreatment is the rate-limiting step for bioethanol production from lignocellulosic biomass, and subsequently intensive studies have been undertaken to improve the pretreatment efficiency. However, so far most pretreatment methods failed to achieve desirable sugar recovery from both cellulose and …
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Effects of AFEX Pretreatment, Denisifcation and Storage on Ethanol Yields of Corn Stover, Switchgrass and Prairie Cordgrass
… (PCG) were addressed as part of a cellulose-to-ethanol process. It is most cost-effective to transport densified cellulosic materials; however this can be cost prohibitive. AFEX pretreatment coupled with an innovative densification method allowed reduced costs per unit. Five conditions were …
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Life cycle analysis of hybrid poplar trees for cellulosic ethanol
… hybrid poplars as a biomass crop for cellulosic ethanol. A "Life Cycle Assessment" (LCA) methodology is used to systematically evaluate the hybrid poplar's energy input and output as well as greenhouse gas (GHG) emissions. The system boundary is divided into three sections, agriculture, …
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Engineering antimicrobial strains of saccharomyces cerevisiae as industrial platform for non-sterile bioprocesses
… contamination is a major challenge in fuel ethanol facilities, especially during the fermentation stage. Bacterial contaminants compete with yeast for fermentable sugars and nutrients, which obstructs starch to ethanol conversion. This leads to a reduction in ethanol yield. At large …
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Effects of corn quality and storage on dry grind ethanol production
… dry grind industry is the major contributor of ethanol production in the US. Ethanol plants incur economic losses due to seasonal variations in ethanol yields. Ethanol yields typically are low during the first month after harvest, increase for the next six to seven months and decrease again …
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Estrategias de uso de Saccharomyces cerevisiae en fermentaciones aeróbicas
… itself, in an increase in the concentration of ethanol, and therefore in an increase in the alcohol content of the wine. It is estimated that since 1980 commercial wines have increased their alcohol content by 1% every decade. This pattern of increase has been observed in all types of wines and …
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Use of treated effluent water in cellulosic ethanol production
The bioethanol industry exerts a significant demand on water supplies. Current water consumption rate in corn dry grind ethanol plants is 3 to 4 gallons of water per gallon of ethanol produced (gal/gal) and 6 to 10 gal/gal for cellulosic ethanol plants. The main goal of this study was to examine …
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Stover, tillage, and nitrogen management in continuous corn for grain, ethanol, and soil carbon
… corn (Zea mays L.) cellulosic materials for ethanol production has resulted in the development of research questions regarding its potential effects on crop growth and productivity as well as soil quality. Previous research has generally occurred in environments different than those found in …
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The exploitation of municipal solid waste (MSW) and related waste paper streams in the production of bioalcohol
… severities, and lack of clear benefit regarding ethanol yield. Interestingly, levels of inhibitors were low compared to other pre-treated substrates and addition of paper to other substrates greatly reduced their own production of inhibitors during pre-treatment (wheat straw 60%, filter paper …
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Optimal yeast strains for the production of fuels and chemicals from lignocellulosic biomass
… levels of XYL1/XYL2/XYL3 to maximize the ethanol yield with a minimum xylitol yield. Later, I confirmed that the optimized expression level of the xylose-assimilating pathway resulted efficient xylose fermentation regardless of the unbalanced cofactor requirements between XR and XDH: …
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Ethanol from photoperiod-sensitive sorghum: a study on biomass structure and process optimization
Cellulosic ethanol made from low cost lignocellulosic biomass has been considered as new generation transportation fuel with economic and environmental advantages. Photoperiod-sensitive (PS) sorghum, because of its high biomass yield (2.6 kg dry mass/m2), about 18% of soluble sugar in dry mass, and …
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Engineering economic analysis of the quick-germ/quick-fiber modified dry grind ethanol fractionation process
It has been widely debated whether producing ethanol from corn is sustainable in the long term. Environmentally, the major concern is that producing ethanol from corn involves intensive water and energy consumption. Economically, recent fluctuations in petroleum, ethanol, and corn prices have …
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Steam Explosion Pretreatment of Cotton Gin Waste for Fuel Ethanol Production
… to produce a value-added product - fuel ethanol. Cotton gin waste consists of pieces of burs, stems, motes (immature seeds) and cotton fiber, and is considered to be a lignocellulosic material. The three main chemical constituents are cellulose, hemicellulose, and lignin. Cellulose and …
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Comparative analysis of sorghum and other South African grains for sustainable bioethanol production
… ultimately replace it as the fuel of choice. Bioethanol is a form of fuel that is obtained from natural materials such as biomass. Starch and sugar containing materials are the primary carbon sources for bioethanol production and a range of feedstocks are currently being exploited for this …
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