Process simulation based life cycle assessment for bioethanol production from cassava, cane molasses, and rice straw

Rathnayake, Mahinsasa; Chaireongsirikul, Thanapat; Svang-Ariyaskul, Apichit; Lawtrakul, Luckhana; Toochinda, Pisanu

doi:10.1016/j.jclepro.2018.04.152

Cited by 61 publications

(23 citation statements)

References 44 publications

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“…This outcome can be explained by the higher energy requirement of lignocellulosic-based biorefineries with respect to the starch-based ones, as the pretreatment phase is a crucial step in order to make cellulose and hemicellulose accessible for the subsequent enzymatic hydrolysis (Sims et al, 2008). Cassava peels have been recognized as very promising feedstock for bioethanol production by Rathnayake et al (2018) compared to rice straw and cane molasses, based on LCA outcomes. Results from Rathnayake et al (2018) are not comparable with those obtained in this paper since LCA boundaries are different.…”

Section: Discussionmentioning

confidence: 99%

“…Cassava peels have been recognized as very promising feedstock for bioethanol production by Rathnayake et al (2018) compared to rice straw and cane molasses, based on LCA outcomes. Results from Rathnayake et al (2018) are not comparable with those obtained in this paper since LCA boundaries are different. Nevertheless, we can maintain that the final judgment regarding cassava peels are consistent.…”

Section: Discussionmentioning

confidence: 99%

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Sustainability Assessment of Biorefinery Systems Based on Two Food Residues in Africa

Patrizi

Bruno

Saladini

et al. 2020

Front. Sustain. Food Syst.

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The overexploitation of fossil fuels as main energy source to support the global economy is identified as the most responsible of the current critical situation from an environmental viewpoint. The need to replace fossil fuels has posed the attention on alternative energy sources such as biofuels, in both developed and developing countries. Africa, for example, has enormous natural resources in the form of biomass from agriculture and other related processes (i.e., food residues). An action that can help fight climate change is the implementation of biofuel refineries to maximize the value of biomass by converting it into a range of products, like energy vectors, biomaterials, feed and fertilizers. By using emergy evaluation and Life Cycle Assessment (LCA) this study focused on the potential development of sustainable biotechnological processes fed by biowaste and bioresidues in two African countries (Egypt and Ghana). We assessed the sustainability level of two biofuel productions based on starch and lignocellulosic feedstocks (i.e., cassava peel and corn stover, respectively). A first understanding of the sustainability of the case studies was obtained and the results showed that the biorefinery based on cassava peel was more sustainable from both the user and donor perspectives. Indeed, the LCA results showed that impact categories Global Warming Potential (GWP) and Acidification Potential (AP) had lower values for cassava compared to corn stover biorefinery and emergy outcomes highlighted that the starch-rich feedstock had lower Unit Emergy Value (UEV) and higher renewability percentage (94%). These results suggest that biorefineries are an option for world bioeconomy strategy as they enable optimization of agricultural and food residues and their environmental performance in producing a renewable substitute for fossil fuels and other non-renewable materials is promising.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Sustainability Assessment of Biorefinery Systems Based on Two Food Residues in Africa

Patrizi

Bruno

Saladini

et al. 2020

Front. Sustain. Food Syst.

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“…Various indicators have been used in LCA studies to quantify energy use in the life cycle of biofuels, including fossil energy consumption, primary, secondary or cumulative energy demand and net energy ratio [218]. However, many focused on fossil energy consumption, given that [17][18][19]40,47,48,54,55,57,58,60,68,76,77,80,85,89,92,93,95,96,98,108,[113][114][115]120,121,129,132,133,136,138,139,143,144,147,[152][153][154]156,159,161,162,[164][165][166][167]…”

Section: (B) Energy Usementioning

confidence: 99%

“… GWP of second-generation bioethanol. Based on data from [ 17 , 18 , 33 , 34 , 40 , 66 , 68 , 119 , 120 , 102 , 104 , 105 , 115 , 117 , 128 – 163 ]. The negative values are due to the credits for co-products, such as heat and chemicals.…”

Section: Environmental Impacts Of Biofuelsmentioning

confidence: 99%

“… Fossil energy use in the life cycle of biofuels. Based on data from [ 17 – 19 , 40 , 47 , 48 , 54 , 55 , 57 , 58 , 60 , 68 , 76 , 77 , 80 , 85 , 89 , 92 , 93 , 95 , 96 , 98 , 108 , 113 – 115 , 120 , 121 , 129 , 132 , 133 , 136 , 138 , 139 , 143 , 144 , 147 , 152 – 154 , 156 , 159 , 161 , 162 , 164 – 167 , 169 – 171 , 175 , 176 , 179 – 181 , 187 , 190 – 192 , 195 – 199 , ...…”

Section: Environmental Impacts Of Biofuelsmentioning

confidence: 99%

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Environmental sustainability of biofuels: a review

2020

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Biofuels are being promoted as a low-carbon alternative to fossil fuels as they could help to reduce greenhouse gas (GHG) emissions and the related climate change impact from transport. However, there are also concerns that their wider deployment could lead to unintended environmental consequences. Numerous life cycle assessment (LCA) studies have considered the climate change and other environmental impacts of biofuels. However, their findings are often conflicting, with a wide variation in the estimates. Thus, the aim of this paper is to review and analyse the latest available evidence to provide a greater clarity and understanding of the environmental impacts of different liquid biofuels. It is evident from the review that the outcomes of LCA studies are highly situational and dependent on many factors, including the type of feedstock, production routes, data variations and methodological choices. Despite this, the existing evidence suggests that, if no land-use change (LUC) is involved, first-generation biofuels can—on average—have lower GHG emissions than fossil fuels, but the reductions for most feedstocks are insufficient to meet the GHG savings required by the EU Renewable Energy Directive (RED). However, second-generation biofuels have, in general, a greater potential to reduce the emissions, provided there is no LUC. Third-generation biofuels do not represent a feasible option at present state of development as their GHG emissions are higher than those from fossil fuels. As also discussed in the paper, several studies show that reductions in GHG emissions from biofuels are achieved at the expense of other impacts, such as acidification, eutrophication, water footprint and biodiversity loss. The paper also investigates the key methodological aspects and sources of uncertainty in the LCA of biofuels and provides recommendations to address these issues.

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Life cycle assessment of rice straw for energy valorization: A comprehensive review of methodological trends and future outlooks

Firdaus,

Harun,

Hanafiah

et al. 2024

WIREs Energy & Environment

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In response to the growing awareness of environmental preservation, there has been a surge in studies employing the life cycle assessment (LCA) approach which helps to identify and minimize environmental impacts associated with rice straw recovery processes. However, there is lack of comprehensive and trend analysis related to the development of critical methodological steps of LCA within this field. To fill the gap, this review examines 43 primary LCA studies from 2004 to 2023 period concerning the use of rice straw for bioenergy production and categorized into two groups: the “first‐year group” covering 2004–2013 and the “second‐year group” spanning from 2014 to 2023. This categorization serves to facilitate the examination of trends and patterns within each decade, offering insights into the evolution of research objectives, methodological advancements, and changes in research outcomes over time. The analysis reveals a shift from studying individual technologies to comparing various technologies, includes scenarios development and consideration of economic and social aspects. Furthermore, the “second‐year group” (2014–2023) exhibits a notable uptick in the exploration of gasification, pyrolysis, anaerobic digestion, and fermentation, whereas combustion technologies have experienced a slight decrease in the number of studies. Challenges in LCA studies arise from nonstandardized methodologies, introducing bias and uncertainty. To enhance the reliability and comparability of environmental assessments, it is recommended to establish standardized guidelines, improve transparency, and update databases. Overall, this review provides a foundational resource for future waste‐to‐energy studies and recommends steps to enhance the applicability and validity of LCA in forthcoming research.This article is categorized under: Sustainable Energy > Bioenergy Climate and Environment > Pollution Prevention Climate and Environment > Circular Economy

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Process simulation based life cycle assessment for bioethanol production from cassava, cane molasses, and rice straw

Cited by 61 publications

References 44 publications

Sustainability Assessment of Biorefinery Systems Based on Two Food Residues in Africa

Sustainability Assessment of Biorefinery Systems Based on Two Food Residues in Africa

Environmental sustainability of biofuels: a review

Life cycle assessment of rice straw for energy valorization: A comprehensive review of methodological trends and future outlooks

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