Comparative life cycle assessment of a waste to ethanol biorefinery system versus conventional waste management methods

Papadaskalopoulou, Christina; Sotiropoulos, A.; Novacovic, Jelica; Barabouti, Elli; Mai, Sofia; Malamis, Dimitris; Kekos, Dimitris; Loizidou, Maria

doi:10.1016/j.resconrec.2019.05.006

Cited by 55 publications

(12 citation statements)

References 35 publications

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“…But even in this case, there is no single functional unit which could allow a comparison. Other studies use as functional unit 1 TJ bioenergy [8], others 1MJ ethanol [9,10] or 1kg ethanol [11]. When the focus of the study is on the ethanol production technologies then a volumetric unit of ethanol (i.e., 1L or 1 ton) is prefered as the functional unit [12][13][14].…”

Section: Analysis Of the Studies Concerning The Functional Unitmentioning

confidence: 99%

“…However, the focus of a study may not be the production of ethanol but the management of the waste (municipal or industrial). In this case, different functional units such as 1 ton wet biowaste [9], 1 ton MSW [16] or even the total amount of waste in a given area [17] may be used. −15 kg CO 2 eq/ton biowaste compared to the current waste treatment methods.…”

Section: Analysis Of the Studies Concerning The Functional Unitmentioning

confidence: 99%

“…González-García et al reported that 20% GHG emission produced all over the life cycle of bio-ethanol produced in a brewery waste-based biorefinery are attributed to enzymes and chemicals required [19]. Papadaskalopoulou et al, reported that enzyme contribution in the global warming impact (GWI) of biorefineries producing ethanol range from 11 to 62% due to high variation of the reported GWI of enzymes, different enzyme loadings and ethanol yield [9]. Additionally, cost of enzymes is an important element of the operational costs.…”

Section: System Boundaries Analysismentioning

confidence: 99%

“…Another way to overcome high solids associated problem is pre-hydrolysis and Simultaneous Saccharification and Fermentation (PSSF) process, which is a variation of the SSF process, in which the substrate passes through a brief pre-hydrolysis step at optimum temperature for enzymes followed by fermentation [39]. During fermentation CO 2 is produced which is considered biogenic and according to the IPCC (2006) the biogenic CO 2 emissions have a global warming potential of zero [9]. Downstream processing of ethanol requires solid separation and purification which can be analysed in distillation and dehydration.…”

Section: System Boundaries Analysismentioning

confidence: 99%

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Life Cycle Analysis of the Bioethanol Production from Food Waste—A Review

2020

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Food Waste (FW) because of its composition is considered as an ideal feedstock for the production of biofuels and in particular bioethanol. The production of bioethanol from lignocellulosic materials has been studied over a long time. The process consists of the stages of pretreatment, enzymatic hydrolysis, fermentation and product recovery. However, the legal framework regarding biofuels has established specific environmental criteria for their production which are regularly updated. The most common tool for the assessment of the environmental performance of a process or product is the Life Cycle Analysis (LCA). In the present review, the results of LCA studies on the production of bioethanol from food waste are presented. Significant differences are observed among the studies in terms of the methodological choices made. Despite the high heterogeneity observed which does not allow a direct comparison among them, there is strong evidence that the production of bioethanol from food waste is an eco-friendly process which can substantially contribute to Green House Gas (GHG) emissions savings.

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Section: Analysis Of the Studies Concerning The Functional Unitmentioning

confidence: 99%

Section: Analysis Of the Studies Concerning The Functional Unitmentioning

confidence: 99%

Section: System Boundaries Analysismentioning

confidence: 99%

Section: System Boundaries Analysismentioning

confidence: 99%

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Life Cycle Analysis of the Bioethanol Production from Food Waste—A Review

2020

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“…In the last few decades, there has been a trend in the production of biofuels as a need for decarbonizing our economy to mitigate climate change and to restrain the depletion of fossil resources (Papadaskalopoulou et al, 2019). Bioethanol is one of the most common commercial biofuels (Zhang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Food waste biorefinery advocating circular economy: Bioethanol and distilled beverage from sweet potato

Weber

Trierweiler

2020

Journal of Cleaner Production

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The exponential growth rate of the global population has been causing a threat to finite resources and also increasing the amount of waste generated. The global quantitative food waste for tubers is 45% per year, which in Brazil would amount to 350,000 tons of sweet potato wasted annually. Food waste causes 10% of the emissions of greenhouse gases. In this work, food waste biorefineries are the proposed solution. Integrated processing via a combination of different technologies to produce both ethanol and distilled beverage was evaluated to valorize sweet potato waste profitably within the circular economy concept. No works concerning the integrated production of both products simulating different real market scenarios were found. Five different scenarios varying the production percentage of each product were evaluated. The higher the production of the distilled beverage, the more profitable the scenarios are. Economic results began to be positive when the production for sale of each product reaches 40%, plus 20% of ethanol for domestic consumption. The scenario with 80% of beverage production presented NPV of US$ 1,078,500.18, IRR of 51%, and discounted payback of 1.06 years. The sweet potato waste biorefinery is a sustainable model and contributes to the development of the agriculture and food sector by providing new businesses and consequent job creation. It also leads to the reduction of greenhouse emissions by producing renewable resources and marketable products, thus reaching the goals of the circular economy.

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Life cycle assessment of bioethanol production from Pennisetum sp. using fed‐batch simultaneous saccharification and cofermentation at high solid loadings

Mohapatra

Behera

Acharya³

et al. 2021

Intl J of Energy Research

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Considerable progress has been achieved for the production of bioethanol from lignocellulosic biomass. However, increasing the substrate concentration has been shown to decrease ethanol productivity. Therefore, Saccharomyces cerevisiae (S. cerevisiae) and Pichia sp. were used for ethanol production from glucose and xylose sugars in the present investigation. Furthermore, coculture fermentations were conducted for 13 g/L of sugar (10 g of glucose and 3 g/L of xylose). It was further used for ethanol production from ultrasonicationassisted NaOH (UA-NaOH) pretreated and enzymatically saccharified biomass in batch and fed-batch fermentation conditions. Furthermore, fed-batch fermentation was used for separate hydrolysis and cofermentation (SHCF) and simultaneous saccharification and cofermentation (SSCF) in shake flask conditions. The highest ethanol production of 12.2 and 7.9 g/L was observed for fedbatch SSCF deenanath grass (DG) and hybrid Napier grass (HNG) (Palkonal MBW as the enzyme) biomass (80 g/L), respectively, in shake flask conditions. However, increasing the biomass concentration to 270 g/L produced an ethanol concentration of 77.6 and 51.3 g/L for DG and HNG, respectively, in fedbatch SSCF conditions in a bioreactor. Furthermore, nuclear magnetic resonance studies of the residual biomass of DG revealed lower carbohydrate content, demonstrating the efficiency of the fermentation strategy. Life cycle analysis of DG and HNG revealed DG had a higher yield as well as lower List of Abbreviations: %, percent; 0 C, degree centigrade; 13 C, an isotope of carbon of mass number 13;

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Comparative life cycle assessment of a waste to ethanol biorefinery system versus conventional waste management methods

Cited by 55 publications

References 35 publications

Life Cycle Analysis of the Bioethanol Production from Food Waste—A Review

Life Cycle Analysis of the Bioethanol Production from Food Waste—A Review

Food waste biorefinery advocating circular economy: Bioethanol and distilled beverage from sweet potato

Life cycle assessment of bioethanol production from Pennisetum sp. using fed‐batch simultaneous saccharification and cofermentation at high solid loadings

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