Fixação de carbono e a emissão dos gases de efeito estufa na exploração da cana-de-açúcar

Paula, M. De; Pereira, F. A. R.; Arias, Edison Rubens Arrabal; Scheeren, Bruno Ricardo; Souza, Celso Correia de; Mata, Danúbia Sales da

doi:10.1590/s1413-70542010000300015

Cited by 7 publications

(5 citation statements)

References 6 publications

(10 reference statements)

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“…A secondary source of GHG emissions (~32%) for production scenarios S1, S2, and S3 is the fossil fuels associated with the agricultural operations of planting, ratoon maintenance, mechanized harvest, and transport of the sugarcane to the mill. Paula et al (2010) estimated that the burning of fossil fuels (diesel) during agricultural operations in the sugarcane production process (planting, cultivation, mechanical harvesting and transportation of the product to the mill) creates a liability of 554.00 kg CO 2 eq ha À1 yr À1 , without considering the GHG emissions related to diesel extraction, processing and distribution. This result is comparable to the one estimated for the S2 scenario (600.8 kg CO 2 eq ha À1 yr À1 ), excluding GHG emissions related to diesel extraction, processing and distribution (103.1 kg CO 2 eq ha À1 yr À1 ).…”

Section: Discussionmentioning

confidence: 99%

Greenhouse gas balance due to the conversion of sugarcane areas from burned to green harvest, considering other conservationist management practices

2012

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There is a growing need for all productive sectors to develop greenhouse gas (GHG) mitigation techniques to reduce the enhanced greenhouse effect. However, the challenge to the agricultural sector is reducing net emissions while increasing production to meet growing demands for food, fiber, and biofuel. This study focuses on the changes in the GHG balance when sugarcane areas are converted from burned harvest (BH) to green harvest (GH, mechanized harvest), including the changes caused by the adoption of conservationist practices such as reduced tillage and a 4-month crop rotation with Crotalaria juncea L. during sugarcane replanting. Based on the Intergovernmental Panel on Climate Change (IPCC) (2006) methodologies, the annual emission balance includes both agricultural and mobile sources of GHG, according to the mean annual consumption of supplies per hectare. The potential soil carbon accumulation was also considered in the GH plot. The total amounts of GHG were 2651.9 and 2316.4 kg CO 2 eq ha À1 yr À1 for BH and GH, respectively. Factoring in a mean annual soil carbon accumulation rate of 888.1 kg CO 2 ha À1 yr À1 due to the input from long-term crop residues associated with the conversion from BH to GH, the emission balance in GH decreased to 1428.3 kg CO 2 eq ha À1 yr À1. A second decrease occurs when a reduced tillage strategy is adopted instead of conventional tillage during the replanting season in the GH plot, which helps reduce the total emission balance to 1180.3 kg CO 2 eq ha À1 yr À1 .Moreover, the conversion of sugarcane from BH to GH, with the adoption of a crop rotation with Crotalaria juncea L. as well as reduced tillage during sugarcane replanting, would result in a smaller GHG balance of 1064.6 kg CO 2 eq ha À1 yr À1 , providing an effect strategy for GHG mitigation while still providing cleaner sugar and ethanol production in southern Brazil.

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Section: Discussionmentioning

confidence: 99%

Greenhouse gas balance due to the conversion of sugarcane areas from burned to green harvest, considering other conservationist management practices

2012

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“…CO 2 emissions considering mechanized harvesting, obtained 0.2 kgCO 2 eq/L, 0.5 kgCO 2 eq/L and 0.5 kgCO 2 eq/L and 0.3 kgCO 2 eq/L, respectively (Paula et al, 2010;Cavallet et al, 2012;Turdera, 2013;Manochio et al, 2017). Indeed, no GHG emission due to the use of fossil fuels in the plants that generate the energy itself from the burning of the sugar cane bagasse Manochio et al (2017).…”

Section: Totalmentioning

confidence: 99%

“…Total CO 2 emissions (kgCO 2 eq/L) for ethanol production (Crago et al, 2010;Paula et al, 2010;Cavallet et al, 2012;Turdera, 2013;Guerra et al, 2014;Munoz et al, 2014;Donke et al, 2017;Manochio et al, 2017).…”

Section: Figurementioning

confidence: 99%

Energetic and Economic Analysis of Use of Hydrated Ethanol

Ruoso¹,

Lhamby²,

Missaggia³

et al. 2020

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Interest in biofuels is growing, and ethanol has been the most used biofuel as an additive and as a gasoline substitute and, it is considered a potential alternative to traditional fuels. Ethanol represents 17% of energy consumption in transportation in Brazil, the transport sector's share in the energy matrix is 32.4%, which is the second most energy-consuming sector. The production of first and second-generation ethanol in the same industrial plant presents better financial results compared to the isolated processes. Also, ethanol obtained from the sugarcane has renewability, biodegradability and provides CO2 emissions mitigation. The objective of the work is to perform an analysis of the ethanol with several levels of hydration in terms of energetic, economic, environmental and safety. The results showed that each 10% of water in ethanol dilution the temperature in the flame surround decreases by 4%. Besides, the ethanol with 20% of water dilution emits 20% less radiation compared to 10% of water dilution. Indeed, the energy consumed in the distillation to produce ethanol with 10% of water is double. On the other hand, this energy difference in the production of ethanol diluted with 30% of water is not enough to compensate for the losses in the energy use process. Also, large amounts of water in ethanol dilution might be unfeasible the use due to the total cost of transportation. Therefore, ethanol with 20% of water represents the more efficient, cleaner and safe fuel in free flame applications.

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“…The gains are due to the carbon sequestration that occurs during sugarcane and soybean cultivation, and also due to photosynthetic action. According to Paula et al [69], the most explored cultivars in Brazil have an average CO 2 uptake rate of 449 g/kg sugarcane in natura. Regarding soybean, this rate was estimated by Rigon et al [70] as 1.36 kg/kg soybean for plants with moisture content of u = 15%.…”

Section: Carbon Balancementioning

confidence: 99%

Environmental Performance of Alternative Green Polyol Synthesis Routes: A Proposal for Improvement

2021

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This study verified the environmental effectiveness of potentially less aggressive routes for the synthesis of poly(propylene/ethylene oxide) glycol (PPG). The analysis was developed in two stages. Firstly, the environmental performance of the conventional PPG processing route was compared to alternative variants—vegetal PPG and CO2-based PPG—applying the life cycle assessment technique to measure the primary energy demand, global warming potential, acidification, photochemical oxidation, and freshwater ecotoxicity impact categories. The synthesis of vegetable polyols from bio-based assets, such as vegetable oils, and the application of CO2 conversion routes as an alternative to technologies supported by petroleum and natural gas were studied. The use of CO2 recovered through carbon capture and usage practices resulted in environmental gains for PPG production. The processing routes within vegetal assets were not an environmentally attractive option as the performance was worse than the conventional arrangement by 144% for the global warming impact category, an increase related to the deforestation carried out to expand soybean cultivation in Brazil. Secondly, improvement scenarios to mitigate the environmental impacts of alternative routes were performed. The hypothesis of using cleaner inputs to obtain a more ecofriendly route was tested. The analysis concluded that the use of high-purity CO2 brings fewer benefits compared to other capturing sources that need a purification process before feeding the PPG synthesis.

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Fixação de carbono e a emissão dos gases de efeito estufa na exploração da cana-de-açúcar

Cited by 7 publications

References 6 publications

Greenhouse gas balance due to the conversion of sugarcane areas from burned to green harvest, considering other conservationist management practices

Greenhouse gas balance due to the conversion of sugarcane areas from burned to green harvest, considering other conservationist management practices

Energetic and Economic Analysis of Use of Hydrated Ethanol

Environmental Performance of Alternative Green Polyol Synthesis Routes: A Proposal for Improvement

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