Reducing the life cycle GHG emissions of microalgal biodiesel through integration with ethanol production system

Maranduba, Henrique Leonardo; Robra, Sabine; Nascimento, Iracema Andrade; Cruz, Rosenira Serpa da; Rodrigues, Luciano Brito; Neto, José Adolfo de Almeida

doi:10.1016/j.biortech.2015.06.113

Cited by 26 publications

(4 citation statements)

References 30 publications

(19 reference statements)

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“…A similar observation was made that conversion of crop lands to biofuel production facilities could force farmers to convert grasslands and other areas for crop production and sustenance, which could significantly increase GHG emissions by up to 50% . Nonetheless, the greenhouse gas sequestration by growth of microalgae as well as the biorefinery approaches using microalgal biomass may potentially reduce the GHG emissions …”

Section: Environmental Impactmentioning

confidence: 72%

Analysis of Economic and Environmental Aspects of Microalgae Biorefinery for Biofuels Production: A Review

et al. 2018

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Microalgae are considered promising feedstock for the production of biofuels and other bioactive compounds, yet there are still challenges on commercial applications of microalgae-based products. This review focuses on the economic analysis, environmental impact, and industrial potential of biofuels production from microalgae. The cost of biofuels production remains higher compared to conventional fuel sources. However, integration of biorefinery pathways with biofuels production for the recovery of value-added products (such as antioxidants, natural dyes, cosmetics, nutritional supplements, polyunsaturated fatty acids, and so forth) could substantially reduce the production costs. It also paves the way for sustainable energy resources by significantly reducing the emissions of CO , NO , SO , and heavy metals. Large-scale biofuels production has yet to be successfully commercialized with many roadblocks ahead and heavy competition with conventional fuel feedstock as well as technological aspects. One of the prominent challenges is to develop a cost-effective method to achieve high-density microalgal cultivation on an industrial scale. The biofuels industry should be boosted by Government's support in the form of subsidies and incentives, for addressing the pressing climate change issues, achieving sustainability, and energy security.

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Section: Environmental Impactmentioning

confidence: 72%

Analysis of Economic and Environmental Aspects of Microalgae Biorefinery for Biofuels Production: A Review

et al. 2018

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“…Studies on the impacts of biore nery projects observed in the literature mainly consider the technical and economic aspects through the analysis of pro tability indicators and production costs (Aristizábal M. et Zang et al, 2020). And environmental, since in a signi cant way, the scienti c literature found in this area of knowledge uses the method of life cycle analysis (LCA) to evaluate the impacts of the inputs used in the production process as well as the products to be generated arising from the various raw materials (Cherubini & Jungmeier, 2010;Kratky & Zamazal, 2020;Maranduba et al, 2015;Ou & Cai, 2020;Secchi et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Multi-purpose biorefineries and their social impacts: A systematic literature review

Santos

Ianda

Carvalho

et al. 2023

Preprint

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Multi-product biorefineries are very promising industries to diversify the economy of countries since they have a productive matrix with a biological characteristic capable of processing various types of biomass with applications in pharmaceutical, renewable energy, and other industries. In this context, this research carries out an analysis of the literature on biorefineries and the methods of assessing social impacts that consider quality of life, employment, and stakeholders, among other metrics, as guided by the United Nations – UN. A systematic review combined with bibliometric, semantic, and content analysis was carried out by searching scientific documents in the Scopus and Web of Science databases. A total of 116 articles were located, of which twenty-three were selected by three researchers to compose the research. The Fleiss Kappa Index was applied to verify the agreement of the evaluators' decision regarding the inclusion and exclusion of articles, they obtained K = 0.43 above the tolerable limit defined for the inclusion of articles, which is K ≥ 0.21Therefore, all twenty-three articles were included. The results indicate that most biorefinery projects consider optimization and econometric methods and especially the employment metric, therefore, understood as insufficient for assessing social impacts. On the other hand, projects whose methods consider Social Life Cycle and Multicriteria are more consistent for assessing the social impacts of biorefineries, as they allow an analysis of qualitative and significant information.

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“…The diagnosis pointed out difficulties to simultaneously optimize profits and reduce environmental impacts. An advanced integration of sugarcane plant with biorefinery systems, involving microalgae for biodiesel production, was also assessed by using database correlations [27][28][29]. Ariyawansha et al [30] studied the impact of the degree of mechanization in sugarcane harvesting in Sri Lanka (18%).…”

Section: Introductionmentioning

confidence: 99%

Modelling of a Brazilian ethanol plant: impact of the bagasse use and the ethanol dehydration on energy efficiency and sustainability

Filho

Pradelle

2020

J Braz. Soc. Mech. Sci. Eng.

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Ethanol has a large share in Brazilian primary energy consumption and plays a significant role in the mitigation of the emissions from combustion engines, as national regulations advance towards increasing anhydrous ethanol content in gasoline or by the direct use of hydrated ethanol as fuel. A simulation of a sugarcane ethanol plant with a regular yield of 85.3 L of ethanol per ton of cane was carried out. The investigated process starts from the cultivation of sugarcane to the production of hydrated and/or anhydrous ethanol. The study considered that bagasse can be either burnt for cogeneration or used as feedstock for the enzymatic hydrolysis system. Additionally, alternative energy sources (such as natural gas (NG) burnt in a boiler or electricity from the Brazilian National Interconnected System (NIS)) are considered in order to cover the domestic demand in cases where biomass lacked for energy purposes. Net energy ratio (NER), fossil energy ratio (FER) and total CO 2 emission were modelled through central composite designs to assess scenarios in which the fraction of bagasse sent to hydrolysis (x 1) and hydrated ethanol sent to dehydration (x 2) both varied between 0 and 100%. The application of statistical tools (ANOVA, Student's t test and R 2) showed that x 1 caused significant variations on the investigated parameters, while x 2 proportioned mild effects. NER varied in the range 0.795-0.984, with an optimal value being found at (x 1 , x 2) equal to (81.82, 0) and (36.67, 0) when the system is coupled to NIS and a NG boiler, respectively. FER was verified as high as 11.910 with energy from NIS to produce hydrated ethanol with maximal cogeneration from the bagasse. It diminished to 3, when around 40% of bagasse is sent to enzymatic hydrolysis instead for the cogeneration system and NG complements the domestic demand.

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Reducing the life cycle GHG emissions of microalgal biodiesel through integration with ethanol production system

Cited by 26 publications

References 30 publications

Analysis of Economic and Environmental Aspects of Microalgae Biorefinery for Biofuels Production: A Review

Analysis of Economic and Environmental Aspects of Microalgae Biorefinery for Biofuels Production: A Review

Multi-purpose biorefineries and their social impacts: A systematic literature review

Modelling of a Brazilian ethanol plant: impact of the bagasse use and the ethanol dehydration on energy efficiency and sustainability

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