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889 results on '"Dale, Bruce E."'

5. Uncertainties in greenhouse gas emission factors: A comprehensive analysis of switchgrass‐based biofuel production.

Author

Kim, Seungdo, Dale, Bruce E., and Basso, Bruno

Subjects
*GREENHOUSE gases, *SUSTAINABILITY, *MONTE Carlo method, *GREENHOUSE gas mitigation, *PRODUCT life cycle assessment, *SWITCHGRASS
Abstract

This study investigates uncertainties in greenhouse gas (GHG) emission factors related to switchgrass‐based biofuel production in Michigan. Using three life cycle assessment (LCA) databases—US lifecycle inventory (USLCI) database, GREET, and Ecoinvent—each with multiple versions, we recalculated the global warming intensity (GWI) and GHG mitigation potential in a static calculation. Employing Monte Carlo simulations along with local and global sensitivity analyses, we assess uncertainties and pinpoint key parameters influencing GWI. The convergence of results across our previous study, static calculations, and Monte Carlo simulations enhances the credibility of estimated GWI values. Static calculations, validated by Monte Carlo simulations, offer reasonable central tendencies, providing a robust foundation for policy considerations. However, the wider range observed in Monte Carlo simulations underscores the importance of potential variations and uncertainties in real‐world applications. Sensitivity analyses identify biofuel yield, GHG emissions of electricity, and soil organic carbon (SOC) change as pivotal parameters influencing GWI. Decreasing uncertainties in GWI may be achieved by making greater efforts to acquire more precise data on these parameters. Our study emphasizes the significance of considering diverse GHG factors and databases in GWI assessments and stresses the need for accurate electricity fuel mixes, crucial information for refining GWI assessments and informing strategies for sustainable biofuel production. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Next-generation ammonia pretreatment enhances cellulosic biofuel production

Author

da Costa Sousa, Leonardo, Jin, Mingjie, Chundawat, Shishir P. S, Bokade, Vijay, Tang, Xiaoyu, Azarpira, Ali, Lu, Fachuang, Avci, Utku, Humpula, James, Uppugundla, Nirmal, Gunawan, Christa, Pattathil, Sivakumar, Cheh, Albert M, Kothari, Ninad, Kumar, Rajeev, Ralph, John, Hahn, Michael G, Wyman, Charles E, Singh, Seema, Simmons, Blake A, Dale, Bruce E, and Balan, Venkatesh

Published
2016

9. A comparative study of ethanol production using dilute acid, ionic liquid and AFEX™ pretreated corn stover

Author

Uppugundla, Nirmal, da Costa Sousa, Leonardo, Chundawat, Shishir PS, Yu, Xiurong, Simmons, Blake, Singh, Seema, Gao, Xiadi, Kumar, Rajeev, Wyman, Charles E, Dale, Bruce E, and Balan, Venkatesh

Subjects
Biological Sciences, Industrial Biotechnology, Affordable and Clean Energy, AFEX, Dilute acid, Ionic liquid, Pretreatment, Enzymatic hydrolysis, Cellulosic ethanol
Abstract

BackgroundIn a biorefinery producing cellulosic biofuels, biomass pretreatment will significantly influence the efficacy of enzymatic hydrolysis and microbial fermentation. Comparison of different biomass pretreatment techniques by studying the impact of pretreatment on downstream operations at industrially relevant conditions and performing comprehensive mass balances will help focus attention on necessary process improvements, and thereby help reduce the cost of biofuel production.ResultsAn on-going collaboration between the three US Department of Energy (DOE) funded bioenergy research centers (Great Lakes Bioenergy Research Center (GLBRC), Joint BioEnergy Institute (JBEI) and BioEnergy Science Center (BESC)) has given us a unique opportunity to compare the performance of three pretreatment processes, notably dilute acid (DA), ionic liquid (IL) and ammonia fiber expansion (AFEX(TM)), using the same source of corn stover. Separate hydrolysis and fermentation (SHF) was carried out using various combinations of commercially available enzymes and engineered yeast (Saccharomyces cerevisiae 424A) strain. The optimal commercial enzyme combination (Ctec2: Htec2: Multifect Pectinase, percentage total protein loading basis) was evaluated for each pretreatment with a microplate-based assay using milled pretreated solids at 0.2% glucan loading and 15 mg total protein loading/g of glucan. The best enzyme combinations were 67:33:0 for DA, 39:33:28 for IL and 67:17:17 for AFEX. The amounts of sugar (kg) (glucose: xylose: total gluco- and xylo-oligomers) per 100 kg of untreated corn stover produced after 72 hours of 6% glucan loading enzymatic hydrolysis were: DA (25:2:2), IL (31:15:2) and AFEX (26:13:7). Additionally, the amounts of ethanol (kg) produced per 100 kg of untreated corn stover and the respective ethanol metabolic yield (%) achieved with exogenous nutrient supplemented fermentations were: DA (14.0, 92.0%), IL (21.2, 93.0%) and AFEX (20.5, 95.0%), respectively. The reason for lower ethanol yield for DA is because most of the xylose produced during the pretreatment was removed and not converted to ethanol during fermentation.ConclusionsCompositional analysis of the pretreated biomass solids showed no significant change in composition for AFEX treated corn stover, while about 85% of hemicellulose was solubilized after DA pretreatment, and about 90% of lignin was removed after IL pretreatment. As expected, the optimal commercial enzyme combination was different for the solids prepared by different pretreatment technologies. Due to loss of nutrients during the pretreatment and washing steps, DA and IL pretreated hydrolysates required exogenous nutrient supplementation to ferment glucose and xylose efficiently, while AFEX pretreated hydrolysate did not require nutrient supplementation.

Published
2014

10. Sugarcane ethanol and beef cattle integration in Brazil

Author

de Souza, Nariê Rinke Dias, Fracarolli, Juliana Aparecida, Junqueira, Tassia L., Chagas, Mateus F., Cardoso, Terezinha F., Watanabe, Marcos D.B., Cavalett, Otavio, Venzke Filho, Solismar P., Dale, Bruce E., Bonomi, Antonio, and Cortez, Luis Augusto Barbosa

Published
2019
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34. Effect of storage conditions on the stability and fermentability of enzymatic lignocellulosic hydrolysate

Author

Jin, Mingjie, Bothfeld, William, Austin, Samantha, Sato, Trey K., La Reau, Alex, Li, Haibo, Foston, Marcus, Gunawan, Christa, LeDuc, Richard D., Quensen, John F., Mcgee, Mick, Uppugundla, Nirmal, Higbee, Alan, Ranatunga, Ruwan, Donald, Charles W., Bone, Gwen, Ragauskas, Arthur J., Tiedje, James M., Noguera, Daniel R., Dale, Bruce E., Zhang, Yaoping, and Balan, Venkatesh

Published
2013
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46. Comparative genomics of xylose-fermenting fungi for enhanced biofuel production

Author

Wohlbach, Dana J., Kuo, Alan, Sato, Trey K., Potts, Katlyn M., Salamov, Asaf A., LaButti, Kurt M., Sun, Hui, Clum, Alicia, Pangilinan, Jasmyn L., Lindquist, Erika A., Lucas, Susan, Lapidus, Alla, Jin, Mingjie, Gunawan, Christa, Balan, Venkatesh, Dale, Bruce E., Jeffries, Thomas W., Zinkel, Robert, Barry, Kerrie W., Grigoriev, Igor V., and Gasch, Audrey P.

Published
2011

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