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Full-Text Articles in Engineering

Biofuel Supply Chain Restructuring -- An Economic Viability And Environmental Sustainability Investigation For Enhancing Second Generation Biofuel Adoption, Rajkamal Kesharwani Jan 2019

Biofuel Supply Chain Restructuring -- An Economic Viability And Environmental Sustainability Investigation For Enhancing Second Generation Biofuel Adoption, Rajkamal Kesharwani

Doctoral Dissertations

"Biofuel is a promising clean alternative to fossil fuels. Currently, first generation biofuels are commercially produced by using corn grain as biomass feedstock. However, the use of edible matter of crops, may lead to a competition between food and fuel. Therefore, there is a significant push in both industry and academia to commercialize second generation biofuel manufacturing technology, which uses non-edible matter from crops. Most research focuses on individual manufacturing processes for producing second generation biofuel, but the economic and environmental impacts of a large-scale adoption of second generation biofuel manufacturing have been less widely reported.

This work investigates the ...


Metabolic Modeling And Engineering Of Gas Fermentation In Bubble Column Reactors, Jin Chen Nov 2017

Metabolic Modeling And Engineering Of Gas Fermentation In Bubble Column Reactors, Jin Chen

Doctoral Dissertations

Gas fermentation is an attractive route to produce alternative fuels and chemicals from non-food feedstocks, such as waste gas streams from steel mills and synthesis gas (mainly CO and H2) produced from municipal solid waste through gasification. While commercial development of gas fermentation technology is underway, many research problems must be addressed to further advance the technology towards economic competitiveness. A particularly important challenge is to develop integrated metabolic and transport models that describe gas fermentation in industrially relevant bubble column reactors.

I have developed and evaluated a spatiotemporal metabolic model for bubble column reactors with the syngas fermenting ...


Industrial Robustness: Understanding The Mechanism Of Tolerance For The Populus Hydrolysate Tolerant Strain Of Clostridium Thermocellum, Jessica Leigh Linville May 2013

Industrial Robustness: Understanding The Mechanism Of Tolerance For The Populus Hydrolysate Tolerant Strain Of Clostridium Thermocellum, Jessica Leigh Linville

Doctoral Dissertations

An industrially robust microorganism that can efficiently degrade and convert lignocellulosic biomass into ethanol and next-generation fuels is required to economically produce future sustainable liquid transportation fuels. The anaerobic, thermophilic, cellulolytic bacterium Clostridium thermocellum is a candidate microorganism for such conversions but it, like many bacteria, is sensitive to potential toxic inhibitors developed in the hydrolysate produced during biomass processing. Microbial processes leading to tolerance of the inhibitory compounds found in the pretreated biomass hydrolysate are likely complex and involve multiple genes. In this study, a 17.5% v/v Populus hydrolysate tolerant mutant strain of C. thermocellum was developed ...