Composition of corn dry-grind ethanol by-products: DDGS, wet cake, and thin stillage

Kim, Youngmi; Mosier, Nathan S.; Hendrickson, Rick; Ezeji, Thaddeus Chukwuemeka; Blaschek, Hans P.; Dien, Bruce S.; Cotta, Michael A.; Dale, Bruce E.; Ladisch, Michael R.

doi:10.1016/j.biortech.2007.09.028

Cited by 303 publications

(229 citation statements)

References 16 publications

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“…The fact that the fermenting cells is free from solid substrates (i.e., lignocellulosic materials) in the fermentation reactor under the SSFF, opens up the opportunity for the production of a second value-added product (i.e., biomass as animal feed) from the residual glucose, pentose sugars (such as xylose), and other components (such as acetic acid) contained in the pretreated wheat straw slurry. This would be a similar situation as exists for the 1 st generation bioethanol plants from starch grains where both ethanol and animal feed products are generated (Kim et al, 2008).…”

Section: Introductionmentioning

confidence: 78%

Fungal protein and ethanol from lignocelluloses using Rhizopus pellets under simultaneous saccharification, filtration and fermentation (SSFF)

et al. 2016

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Please cite this article as: FazeliNejad S., Ferreira J.A., Brandberg T., Lennartsson P.R., Taherzadeh M.J. Fungal protein and ethanol from lignocelluloses using Rhizopus pellets under simultaneous saccharification, filtration and fermentation (SSFF). Biofuel Research Journal 9 (2016) SSFF can be used for production of ethanol and biomass from wheat straw.Glucose present in the feed controlled the assimilation of xylose and acetic acid.The fungal growth rate was found not to be influenced by the feed composition.Rhizopus biomass yields of up 0.34 g/g and ethanol yields of 0.40 g/g were obtained. The economic viability of the 2 nd generation bioethanol production process cannot rely on a single product but on a biorefinery built around it. In this work, ethanol and fungal biomass (animal feed) were produced from acid-pretreated wheat straw slurry under an innovative simultaneous saccharification, fermentation, and filtration (SSFF) strategy. A membrane unit separated the solids from the liquid and the latter was converted to biomass or to both biomass and ethanol in the fermentation reactor containing Rhizopus sp. pellets. Biomass yields of up to 0.34 g/g based on the consumed monomeric sugars and acetic acid were achieved. A surplus of glucose in the feed resulted in ethanol production and reduced the biomass yield, whereas limiting glucose concentrations resulted in higher consumption of xylose and acetic acid. The specific growth rate, in the range of 0.013-0.015/h, did not appear to be influenced by the composition of the carbon source. Under anaerobic conditions, an ethanol yield of 0.40 g/g was obtained. The present strategy benefits from the easier separation of the biomass from the medium and the fungus ability to assimilate carbon residuals in comparison with when yeast is used. More specifically, it allows in-situ separation of insoluble solids leading to the production of pure fungal biomass as a value-added product. ARTICLE INFO ABSTRACT © 2016 BRTeam. All rights reserved.Journal homepage: www.biofueljournal.com FazeliNejad et al. / Biofuel Research Journal 9 (2016) [372][373][374][375][376][377][378] Please cite this article as: FazeliNejad S., Ferreira J.A., Brandberg T., Lennartsson P.R., Taherzadeh M.J. Fungal protein and ethanol from lignocelluloses using Rhizopus pellets under simultaneous saccharification, filtration and fermentation (SSFF).

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Section: Introductionmentioning

confidence: 78%

Fungal protein and ethanol from lignocelluloses using Rhizopus pellets under simultaneous saccharification, filtration and fermentation (SSFF)

et al. 2016

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“…The assignment of environmental loads among the distillery coproducts-ethanol, fusel oil and vinasse in the case of sugarcane, and all these as well as Dried Distillers Grains with Solubles (DDGS) for starchy sources-was based on the (C/H) ratio of those flows, which have been established from typical compositions [41][42][43]. The decision was made due to the energy nature of the systems under analysis and their co-products, which can be quantified from that relation.…”

Section: Scope Definitionmentioning

confidence: 99%

Environmental and Energy Performance of Ethanol Production from the Integration of Sugarcane, Corn, and Grain Sorghum in a Multipurpose Plant

et al. 2016

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Abstract:Although in the last 40 years only sugarcane has been harnessed for the production of ethanol in Brazil, corn production has grown strongly in certain areas, and may serve as a supplementary feedstock for ethanol production in integrated plants during the sugarcane off-season. The aim of this study is to evaluate the environmental and energy performance of ethanol production from sugarcane, corn, and grain sorghum in a Flex Mill in the state of Mato Grosso, Brazil. A life cycle assessment was carried out to survey the production of ethanol from each individual feedstock, and the integration of two of these to increase production during a one-year period. Results indicate that the environmental and energy performance are greatly influenced by agricultural activities, highlighting the importance of sugarcane cultivation. Still, there was an increasing trend of Climate Change impacts, Human Toxicity (carcinogenic) and Ecotoxicity, as well as reduced impact of Photochemical Oxidant Formation and Energy Return on Investment (EROI) as the proportion of ethanol from starchy sources in integration scenarios increases.

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“…Distilling stillage is a residual product of the ethanol production process and it is good raw biomass for production of biogas. The potential of biogas from stillage was investigated by many researchers in different countries [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Methane production from stillage

Dubrovskis¹,

Plume²

2017

Engineering for Rural Development

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Abstract. By-products from production of alcohol distilling dregs (stillage) contain much organic matter, therefore could be useful for the production of biogas. The purpose of the study is assessment of the methane volume obtainable from stillage in the anaerobic fermentation process. Investigation was provided in 16 bioreactors operated in batch mode at 38 ºC. Stillage was filled into 14 bioreactors and only inoculum was filled into two bioreactors for control. The yield of biogas was 0.616 l·g -1 DOM and methane 0.360 l·g -1 DOM after 37 days of anaerobic digestion. The investigated average methane content in biogas from stillage was 58.5 %. The study demonstrates that stillage is a good raw material for the production of methane.

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Composition of corn dry-grind ethanol by-products: DDGS, wet cake, and thin stillage

Cited by 303 publications

References 16 publications

Fungal protein and ethanol from lignocelluloses using Rhizopus pellets under simultaneous saccharification, filtration and fermentation (SSFF)

Fungal protein and ethanol from lignocelluloses using Rhizopus pellets under simultaneous saccharification, filtration and fermentation (SSFF)

Environmental and Energy Performance of Ethanol Production from the Integration of Sugarcane, Corn, and Grain Sorghum in a Multipurpose Plant

Methane production from stillage

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