Emergy efficiency analysis of sugarcane as a raw material for ethanol production

Vitória, Edney Leandro da; Rodrigues, Joice Paraguassú

doi:10.5935/1806-6690.20160074

Cited by 7 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, in the bagasse-AHR mixture, the renewability ratio (23.58%) is higher by 18.77% compared with that found in Ref. [74]. Nevertheless, in both cases, its use is undoubtedly lower than the use of bagasse.…”

Section: -88mentioning

confidence: 60%

Energy Sustainability Indicators for the Use of Biomass as Fuel for the Sugar Industry

Borges,

Iturralde Carrera,

Bastida

et al. 2024

Technologies

View full text Add to dashboard Cite

There are numerous analytical and/or computational tools for evaluating the energetic sustainability of biomass in the sugar industry. However, the simultaneous integration of the energetic–exergetic and emergetic criteria for such evaluation is still insufficient. The objective of the present work is to propose a range of indicators to evaluate the sustainability of the use of biomass as fuel in the sugar industry. For this purpose, energy, exergy, and emergy evaluation tools were theoretically used as sustainability indicators. They were validated in five variants of different biomass and their mixtures in two studies of technologies used in Cuba for the sugar industry. As a result, the energy method showed, for all variants, an increase in efficiency of about 5% in the VU-40 technology compared to the Retal technology. There is an increase in energy efficiency when considering AHRs of 2.8% or Marabu (Dichrostachys cinerea) (5.3%) compared to the V1 variant. Through the study of the exergetic efficiency, an increase of 2% was determined in both technologies for the case of the V1 variant, and an increase in efficiency is observed in the V2 variant of 5% and the V3 variant (5.6%) over the V1 variant. The emergetic method showed superior results for the VU-40 technology over the Retal technology due to higher fuel utilization. In the case of the V1 variant, there was a 7% increase in the renewability ratio and an 11.07% increase in the sustainability index. This is because more energy is produced per unit of environmental load.

show abstract

Section: -88mentioning

confidence: 60%

Energy Sustainability Indicators for the Use of Biomass as Fuel for the Sugar Industry

Borges,

Iturralde Carrera,

Bastida

et al. 2024

Technologies

View full text Add to dashboard Cite

show abstract

“…The renewable irrigated systems (S2A0, S2A1 and S2A2) had a lower environmental load compared to the conventional irrigated systems (S1A0, S1A1 and S1A2) due to the greater influx of renewable natural resources (wastewater) and also the lower influx of non-renewable resources from the economy (chemical fertilisers and electrical services). Vitória and Rodrigues (2016), in a study of the emergy efficiency of sugarcane, found that dependence on chemical fertilisers reduces the fraction of renewable energy and increases environmental degradation, resulting in a less sustainable production system, and highlighted that the use of alternative sources of fertiliser may improve sustainability and reduce the environmental load.…”

Section: Resultsmentioning

confidence: 99%

Environmental impact of different agricultural production systems

Feitosa

Lopes

Andrade

et al. 2021

RCA

View full text Add to dashboard Cite

The efficient use of natural resources in production systems is essential for achieving ecological balance and sustainability in these systems. Current agricultural production systems have intensified the use of fertilisers and pesticides that contribute to an increase in energy flow, accelerating the process of degradation. The aim of this study was to evaluate, using emergy analysis, the environmental performance of different irrigated production systems for different sources of water, energy and fertiliser, and of rainfed systems under different types of soil preparation. The irrigated systems were studied in the experimental area of the Sewage Treatment Station (ETE) in Tianguá, Ceará (CE), and the rainfed models at the Fazenda Normal Farm in Quixeramobim, CE. Emergy analysis basically consists of three stages: construction of the systemic energy flow diagram, elaboration of the emergy evaluation table, and calculation of the emergy indicators. A mean value of 0.04 was found under the rainfed production systems, which shows less environmental stress compared to the irrigated systems, 0.30. The influx of economic resources into agricultural systems increases the environmental load and reduces renewability. Treated domestic effluent and photovoltaic solar energy afforded an increase in emergy yield and in the environmental sustainability of the production models.

show abstract

“…Hence, there must be a large amount of power generation contained in nutrients, agricultural practices, among others, for the production of biomass (Vitoria & Rodriges, 2016;Kumar, Singh, Surekha & Kumar, 2014).…”

Section: Discussion Biomassmentioning

confidence: 99%

Alcohol production from sweet potato (Ipomoea batatas (L.) Lam.) genotypes in fermentative medium

et al. 2018

View full text Add to dashboard Cite

Ethanol is one of the most promising fuels in Brazil, but its production is centralized in sugarcane cultivation, and is currently in search for other sources alcohol producing biomass to replace sugarcane monoculture. The aim of this study was to study fermentation process variables such as fermentation time (72 and 96 hours), addition of nutrients (with and without addition) and yeasts (dry and fresh organic yeast), employed in ethanol production from two sweet potato (Ipomoea batatas (L.) Lam.) genotypes: UGA 05 and UGA 77. Alcohol evaluation content in °GL was performed in a completely randomized design according to two factorial schemes (2 2 and 2 3 ), and results obtained were analyzed using Design Expert® software version 8. Results of the factorial design 2 2 indicate that fermentation time in alcohol production had a significant effect on the process, suggesting that alcohol production is more efficient in 72 hours of fermentation and without the inclusion of nutrients. In factorial design 2 3 , the interactions between time of fermentation with genotypes and between time and inclusion of yeast showed significant effects and altered alcohol production. Fermentation process shows a significant difference as a function of genetic material and yeasts used pointing out fermentation of the flour must of genotype UGA 77 under fresh yeast action and 72 hours of fermentation.Keywords: Biofuel; ethanol production; fermentation; saccharification; starch; water content. ResumenEl etanol es uno de los combustibles más prometedores en Brasil, pero su producción está centralizada en el cultivo de la caña de azúcar, y actualmente se están buscando otras fuentes de biomasa productora de alcohol para reemplazar el monocultivo de la caña de azúcar. El objetivo de este estudio fue evaluar las variables del proceso de fermentación como el tiempo de fermentación (72 y 96 horas), adición de nutrientes (con y sin adición) y levaduras (levadura orgánica seca y fresca) empleadas en la producción de etanol a partir de dos genotipos de batata (Ipomoea batatas L.): UGA 05 y UGA 77. El contenido del alcohol evaluado en °GL se realizó en un diseño completamente al azar según dos esquemas factoriales (2 2 y 2 3 ), y los resultados obtenidos se analizaron con el software Design Expert® versión 8. Los resultados del diseño factorial 2 2 indican que el tiempo de fermentación en la producción de alcohol tuvo un efecto significativo en el proceso, lo que sugiere que la producción de alcohol es más eficiente en 72 horas de fermentación y sin la inclusión de nutrientes. En el diseño factorial 2 3 , las interacciones entre el tiempo de fermentación con genotipos, y entre el tiempo y la inclusión de la levadura mostraron efectos significativos y alteraron la producción de alcohol. El proceso de fermentación muestra una diferencia significativa en función del material genético y las levaduras utilizadas, señalando la fermentación del mosto de harina del genotipo UGA 77 bajo acción de levadura fresca y 72 horas de fermentación.Palabras ...

show abstract

Emergy efficiency analysis of sugarcane as a raw material for ethanol production

Cited by 7 publications

References 24 publications

Energy Sustainability Indicators for the Use of Biomass as Fuel for the Sugar Industry

Energy Sustainability Indicators for the Use of Biomass as Fuel for the Sugar Industry

Environmental impact of different agricultural production systems

Alcohol production from sweet potato (Ipomoea batatas (L.) Lam.) genotypes in fermentative medium

Contact Info

Product

Resources

About