Ethanol production from sugarcane straw using different configurations of fermentation and techno-economical evaluation of the best schemes

AbstractVinasse is the main by-product of ethanol production. In 2005, its application was regulated in the state of Sao Paulo, so if it is to be applied to the fields, its volume must meet the established concentration regulations. Straw contains one-third of sugarcane calorific value and can be used for cogeneration. For these purposes, the project objective was to assess the effects of straw on the concentration of vinasse solids through physical and chemical processes, so its concentrated form could be used as biomass for cogeneration. For that, different concentrations of straw, ferric sulphate, and ferric chloride were used. Turbidity reduction was the parameter analysed. Both reagents were effective in reducing the turbidity. The 200 ppm of ferric chloride and 0.25% straw content reduced the turbidity by 55.02% and 400 ppm of ferric sulphate and 0.25% of straw reduced it by 57.96%. The addition of straw showed no significant effect in terms of the turbidity reduction, however, both best treatments had 0.25% straw content addition in it. Straw can be used to concentrate vinasse, contributing to the efficiency of the process and increasing the energy potential of the concentrated solids.

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ECONOMICAL EVALUATION OF ETHANOL PRODUCTION BY A FAMILY FARMS COOPERATIVE

Engenharia de produção em análise ◽

10.35587/brj.ed.0000318 ◽

2020 ◽

pp. 71-85

Author(s):

Carlos Alberto Mendes Moraes ◽

Cynthia Fleming Batalha da Silveira ◽

Joice Brochier Schneider ◽

André Geraldo Velho Cirne de Lima ◽

Guilherme Luís Roeche Vaccaro

Keyword(s):

Ethanol Production ◽

Family Farms ◽

Economical Evaluation

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Desirability function for optimization of Dilute Acid pretreatment of sugarcane straw for ethanol production and preliminary economic analysis based in three fermentation configurations

Applied Energy ◽

10.1016/j.apenergy.2017.03.018 ◽

2017 ◽

Vol 198 ◽

pp. 299-311 ◽

Cited By ~ 34

Author(s):

Leyanis Mesa ◽

Yenisleidy Martínez ◽

Edenny Barrio ◽

Erenio González

Keyword(s):

Economic Analysis ◽

Ethanol Production ◽

Desirability Function ◽

Dilute Acid Pretreatment ◽

Dilute Acid ◽

Acid Pretreatment ◽

Sugarcane Straw

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Additional Greenhouse Gas Emissions and Offset Potential from Sugarcane Straw Recovery for Bioenergy Production in Southern Brazil

10.21203/rs.3.rs-1072167/v1 ◽

2021 ◽

Author(s):

Eduardo Barretto de Figueiredo ◽

Susantha Jayasundara ◽

Ricardo de Oliveira Bordonal ◽

Alan Rodrigo Panosso ◽

Newton La Scala

Keyword(s):

Ethanol Production ◽

Emission Factor ◽

Ghg Emissions ◽

Soil Surface ◽

Electricity Production ◽

Technical Parameters ◽

Sugarcane Straw ◽

Experimental Parameters ◽

Sustainable Energy Systems ◽

Efficiency Rate

Abstract This study was designed to assess the additional greenhouse (GHG) emissions including measurements of soil CO 2 -C emissions in sugarcane areas plus emissions associated with the recovery and transport operations of straw bales up to the factory gate for electricity production, contrasting with leaving all straw on the soil surface. The total additional GHG emissions considering the main sources evaluated ( i.e ., soil CO 2 -C, diesel use and N 2 O from straw), was estimated at 1,465 kg CO 2 eq ha -1 , resulting an emission factor of 212. 6 kg CO 2 eq ton -1 of straw recovered. Applying the parameters cited in this study for electricity or 2G ethanol production (GHG balance of emission and offset potential), our results showed that straw-based for electricity production would result in additional GHG emissions of (+) 860 kg CO 2 eq ha -1 . In contrast, applying the same study parameters for 2G ethanol production replacing gasoline, an avoided GHG emission of (-) 2,316 kg CO 2 eq ha -1 could be achieved. The route of recovering around 27% of sugarcane straw through bale system for bioelectricity production using technical parameters and industrial efficiency rate of this study could not be a sustainable option because the additional emissions can be higher than its potential to offset generated emissions, based on the emission factor of Brazilian energy matrix. Applying the same experimental parameters, the option of producing ethanol 2G with around 6.89 ton DM ha -1 of sugarcane straw could offset gasoline GHG emissions, contributing with sustainable energy systems.

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The effects of increased corn-ethanol production on U.S. natural gas prices

10.32469/10355/6535 ◽

2009 ◽

Author(s):

Jarrett Whistance

Keyword(s):

Natural Gas ◽

Ethanol Production ◽

Corn Ethanol ◽

Natural Gas Prices

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DECOLOURIZATION AND COD REMOVAL OF WASEWATER FROM ETHANOL PRODUCTION PROCESS FROM MOLASSES BY COAGULANTION USING INORGANIC ALUM

Science and Technology Development Journal ◽

10.32508/stdj.v13i3.2146 ◽

2010 ◽

Vol 13 (3) ◽

pp. 92-102

Author(s):

Trung Duc Le

Keyword(s):

Ethanol Production ◽

Oxygen Demand ◽

Cod Removal ◽

Treated Wastewater ◽

Treatment Processes ◽

Physico Chemical ◽

Biological Methods ◽

Treatment Step ◽

Main Material

The industrial production of ethanol by fermentation using molasses as main material that generates large quantity of wastewater. This wastewater contains high levels of colour and chemical oxygen demand (COD), that may causes serious environmental pollution. Most available treatment processes in Vietnam rely on biological methods, which often fail to treat waste water up to discharge standard. As always, it was reported that quality of treated wastewater could not meet Vietnameses discharge standard. So, it is necessary to improve the treatment efficiency of whole technological process and therefore, supplemental physico-chemical treatment step before biodegradation stage should be the appropriate choice. This study was carried out to assess the effect of coagulation process on decolourization and COD removal in molasses-based ethanol production wastewater using inorganic coaglutant under laboratory conditions. The experimental results showed that the reductions of COD and colour with the utilization of Al2(SO4)3 at pH 9.5 were 83% and 70%, respectively. Mixture FeSO4 – Al2(SO4)3 at pH 8.5 reduced 82% of colour and 70% of COD. With the addition of Polyacrylamide (PAM), the reduction efficiencies of colour, COD and turbidity by FeSO4 – Al2(SO4)3 were 87%, 73.1% and 94.1% correspondingly. It was indicated that PAM significantly reduced the turbidity of wastewater, however it virtually did not increase the efficiencies of colour and COD reduction. Furthermore, the coagulation processes using PAM usually produces a mount of sludge which is hard to be deposited.

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