Contaminant occurrence, identification and control in a pilot-scale corn fiber to ethanol conversion process

Schell, Daniel J.; Dowe, Nancy; Ibsen, Kelly N.; Riley, Cynthia; Ruth, Mark; Lumpkin, Robert E.

doi:10.1016/j.biortech.2006.10.002

Cited by 67 publications

(61 citation statements)

References 10 publications

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“…Bioethanol made from sugar (Brazil) or starch (the US) is the most common renewable biofuel today [2]. It is a known substitute to gasoline or an additive to gasoline [3]. Such fuels derived from crops are termed first-generation biofuels.…”

Section: Current Outlookmentioning

confidence: 99%

“…Therefore, alternative renewable sources of energy such as lignocellulosic biomass will need to be pursued to provide for the shortage in first-generation biofuels. Biofuels derived from lignocellulose (neutral with respect to production of greenhouse gasses) are second-generation biofuels, research into which has escalated over the past decade with a number of pilot plants operating throughout the world [3][4][5].…”

Section: Current Outlookmentioning

confidence: 99%

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Biomass processing into ethanol: pretreatment, enzymatic hydrolysis, fermentation, rheology, and mixing

Volynets

Ein‐Mozaffari

Dahman

2016

Green Processing and Synthesis

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Alternate energy resources need to be developed to amend for depleting fossil fuel reserves. Lignocellulosic biomass is a globally available renewable feedstock that contains a rich sugar platform that can be converted into bioethanol through appropriate processing. The key steps of the process, pretreatment, enzymatic hydrolysis, and fermentation, have undergone considerable amount of research and development over the past decades nearing the process to commercialization. In order for the commercialization to be successful, the process needs to be operated at high dry matter content of biomass, especially in the enzymatic hydrolysis stage that influences ethanol concentration in the final fermentation broth. Biomass becomes a thick paste with challenging rheology for mixing to be effective. As the biomass consistency increases, yield stress increases which limits efficiency of mixing with conventional stirred tanks. The purpose of this review is to provide features and perspectives on processing of biomass into ethanol. Emphasis is placed on rheology and mixing of biomass in the enzymatic hydrolysis step as one of the forefront issues in the field.

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Section: Current Outlookmentioning

confidence: 99%

Section: Current Outlookmentioning

confidence: 99%

Biomass processing into ethanol: pretreatment, enzymatic hydrolysis, fermentation, rheology, and mixing

Volynets

Ein‐Mozaffari

Dahman

2016

Green Processing and Synthesis

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“…brevis and Lb. fermentum as model strains of LAB because they were reported as major contaminants in commercial ethanol production processes [30,34,35]. As shown in Fig.…”

Section: Spore Formation Not Detectedmentioning

confidence: 99%

A strategy to prevent the occurrence of Lactobacillus strains using lactate-tolerant yeast Candida glabrata in bioethanol production

Watanabe

Nakamura

Shima

2008

J Ind Microbiol Biotechnol

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Contamination of Lactobacillus sp. in the fermentation broth of bioethanol production decreases ethanol production efficiency. Although the addition of lactate to the broth can effectively inhibit the growth of Lactobacillus sp., it also greatly reduces the fermentation ability of Saccharomyces cerevisiae. To overcome this conflict, lactate-tolerant yeast strains were screened. Candida glabrata strain NFRI 3164 was found to exhibit both higher levels of lactate tolerance and fermentation ability. Co-cultivation of C. glabrata was performed with Lactobacillus brevis and Lb. fermentum, which were reported as major contaminating bacteria during bioethanol production, in culture medium containing 2% lactate. Under these culture conditions, the growth of Lactobacillus strains was greatly inhibited, but the ethanol production of C. glabrata was not significantly affected. Our data show the possibility of designing an effective fuel ethanol production process that eliminates contamination by Lactobacillus strains through the combined use of lactate addition and C. glabrata.

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“…Conducting fermentations at high temperatures (50 to 70 • C) imparts some advantages; sugars are more readily solubilized and ethanol can be distilled directly, especially through the application of a gas stream or mild vacuum (Hartley and Payton, 1983;Taylor et al, 2009). The presence of sugar-and nutrient-rich feedstocks presents a problem in conventional and ambient fermentations, the best documented being lactic acid bacterial contamination of yeast fermentations (Skinner and Leathers, 2004;Schell et al, 2007). High temperatures reduce gas solubility and favor fermentative metabolism (Banat et al, 1998).…”

Section: Thermophiles and Liquid Fuels: Butanol And Ethanolmentioning

confidence: 99%

Extremophiles and their Application to Biofuel Research

Taylor¹,

Bauer²,

Mackay³

et al. 2012

Extremophiles

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Contaminant occurrence, identification and control in a pilot-scale corn fiber to ethanol conversion process

Cited by 67 publications

References 10 publications

Biomass processing into ethanol: pretreatment, enzymatic hydrolysis, fermentation, rheology, and mixing

Biomass processing into ethanol: pretreatment, enzymatic hydrolysis, fermentation, rheology, and mixing

A strategy to prevent the occurrence of Lactobacillus strains using lactate-tolerant yeast Candida glabrata in bioethanol production

Extremophiles and their Application to Biofuel Research

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