New technologies in value addition to the thin stillage from corn-to-ethanol process

Reis, Cristiano E. Rodrigues; Rajendran, A.; Hu, Bo

doi:10.1007/s11157-017-9421-6

Cited by 54 publications

(43 citation statements)

References 157 publications

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“…Several opportunities used in starch-based ethanol research could be utilized with vinasse as bioprocess medium, such as those producing ethanol, malic acid, butanol, and many other commodity chemicals (Reis et al, 2017). The production of secondary ethanol using N. intermedia and A. oryzae on vinasse, for instance, would potentially provide extra 12.6% ethanol produced annually (Nair and Taherzadeh, 2016).…”

Section: Vinasse As a Feedstock For Biological Treatmentmentioning

confidence: 99%

“…Anaerobic digestion is a common practice in the current drygrind corn-to-ethanol industry, being responsible to generate energy and degrade complex organic matter present in the corn stillage (Reis et al, 2017). Despite the composition of sugarcane vinasse differing significantly from wastewaters with high carbon load to which AD processes are ubiquitous and profitable, the possibility of decreasing the negative impacts to vinasse application in soil usage accelerated the research and development of AD in sugarcane vinasse.…”

Section: Ad Of Vinasse: Operation Energy Generation and Digestate Usementioning

confidence: 99%

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Vinasse from Sugarcane Ethanol Production: Better Treatment or Better Utilization?

Reis

2017

Front. Energy Res.

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Ethanol production from sugarcane in Brazil is a well-established industry, with relatively simple operations and high yield. The ethanol primarily serves as a renewable fuel blending with gasoline and diesel to increase the energy security in Brazil. Several environmental concerns are emerged around the by-products from this industry. Vinasse, the liquid fraction generated from the rectification and distillation operations of ethanol, is a sulfur-rich, low pH, dark-colored, and odorous effluent, produced at volumes as high as 20-fold of ethanol. Traditional wastewater treatments, such as bioprocessing, advanced oxidative processes, anaerobic digestion (AD), and chemical-based processes, have been applied to vinasse management. Despite most of its utilization being in fertirrigation practices, vinasse may represent a key factor in enhancing profitability and environmental outcomes of a sugarcane-to-ethanol plant. The application of some upgrade solutions to sugarcane-derived vinasse may represent additional sources of energy, production of animal feed components, and reduction in water consumption within a plant. The use of mature technologies, yet not widespread in the sugarcane-to-ethanol industry, could help attenuate environmental concerns. Oxidation and chemical processes, AD, and microbial fermentation have been presented as alternative impactful alternatives to (i) reduce its organic and mineral load, converting it to a feedstock with fewer environmental applications when applied as fertilizer and (ii) to convert organic matter and nutrients to a nutritious biomass, simultaneously increasing water reclamation potential by plants. This mini-review article provides a critical and comprehensive summary of the alternatives developed or under development to vinasse management.

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Section: Vinasse As a Feedstock For Biological Treatmentmentioning

confidence: 99%

Section: Ad Of Vinasse: Operation Energy Generation and Digestate Usementioning

confidence: 99%

Vinasse from Sugarcane Ethanol Production: Better Treatment or Better Utilization?

Reis

2017

Front. Energy Res.

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“…Chlorella vulgaris 2714 (UTEX) and Mucor indicus (ATCC) were chosen as model biofilm-forming strains, and were maintained in medium A [11] The use of secondary fermentation, i.e., the utilization of the fermented residues of ethanol co-products as a substrate for other microbial-based processes has been reported as a way to produce malic acid [7], ethanol [8], and a significant number of chemicals [6]. Few studies, however, focus on improving the animal feed quality by fermentation.…”

Section: Microorganisms Medium Preparation and Experimental Designmentioning

confidence: 99%

“…Many solutions have been proposed to increase digestibility of NSPs in distiller's grains, including chemical and enzymatic treatments, which are either nonselective or expensive, respectively. Nonetheless, the use of distiller's grains in animal feed formulation has been a factor in the success of dry-grind corn-to-ethanol plants over the past 20 years, with annual production capacity in the order of 40 metric tons a year [6]. A few key issues still stand out as challenges for the ethanol industry, including water usage and recyclability, and higher displacement of distiller's grains in animal feed rations.…”

Section: Introductionmentioning

confidence: 99%

“…A few key issues still stand out as challenges for the ethanol industry, including water usage and recyclability, and higher displacement of distiller's grains in animal feed rations. Anaerobic digestion of stillage water is currently used to decrease nutrient complexity, providing an alternative for water recycling in ethanol plants, achieving commercial rates of up to 58%, though encountering technical difficulties due to the high presence of suspended solids, and imbalance of C:N, often requiring higher processing times, and not being a practice exploited to its full potential [6].…”

Section: Introductionmentioning

confidence: 99%

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Co-Culture of Filamentous Feed-Grade Fungi and Microalgae as an Alternative to Increase Feeding Value of Ethanol Coproducts

et al. 2018

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Distiller’s grains, an important commodity in the feed and food chains, are currently underdosed in rations due to several factors, mainly nutrient imbalance. This study aimed to increase the linoleic acid content in distiller’s grains and decrease the excess nutrients in stillage water by the use of an artificial lichen, composed of fungi, algae, and a supporting matrix. A maximum concentration of 46.25% of linoleic acid in distiller’s grains was achieved with a combination of Mucor indicus and Chlorella vulgaris using corn-to-ethanol whole stillage as substrate. Microbial hydrolytic enzymes during fermentation were able to decrease the solids in whole stillage. Nitrogen depletion by microalgal uptake causes lipid-formation stress to Mucor indicus cells, increasing linoleic acid production to about 49% of the total lipids, potentially decreasing costs in the animal feed. The culture supernatant can potentially be recycled as process water to the ethanol fermentation tank, and enhanced distiller’s grains can replace animal-specific diets. This would reduce exogenous enzyme use and supplementation of unsaturated fatty acids from other sources.

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Quantification of fructans in cereal‐based bioethanol stillage based on a simplified analytical method

Zimmermann

Kaltschmitt

2022

Cereal Chem

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Background and Objectives Cereal‐based bioethanol stillage, the main by‐product of industrial bioethanol production, is a potential substrate for fructans. However, the quantification of fructans in such complex sample matrices is still a challenge for the corresponding analytics to be overcome to allow for the identification and utilization of such unused fructan sources. Especially a possible utilization or rather the corresponding process development requires appropriate analytics first. Thus, this paper aims to develop and apply a method for fructan quantification in bioethanol stillage using common a high‐performance liquid chromatography–refractive index detector. Findings A new approach for fructan quantification is presented allowing for simple fructan determination in bioethanol stillage for comparably high sample throughput. The developed analytical method performs fructan quantification by means of fructose‐ and glucose‐equivalent determination after targeted acidic hydrolysis adapted to the respective sample matrix. On the basis of this method, up to 2.5% of fructans were found in the dry matter of cereal‐based bioethanol stillage. Conclusion Cereal‐based bioethanol stillage is assessed to be a potential source of fructans. The presented analytical method can be the basis for respective process development and, thus, may contribute to a higher‐value utilization of stillage. Significance and Novelty According to current knowledge, no determination of fructans in stillage or corresponding analytical methods have been published so far.

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New technologies in value addition to the thin stillage from corn-to-ethanol process

Cited by 54 publications

References 157 publications

Vinasse from Sugarcane Ethanol Production: Better Treatment or Better Utilization?

Vinasse from Sugarcane Ethanol Production: Better Treatment or Better Utilization?

Co-Culture of Filamentous Feed-Grade Fungi and Microalgae as an Alternative to Increase Feeding Value of Ethanol Coproducts

Quantification of fructans in cereal‐based bioethanol stillage based on a simplified analytical method

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