An integrated approach for biodiesel and bioethanol production from Scenedesmus bijugatus cultivated in a vertical tubular photobioreactor

Ashokkumar, Veeramuthu; Salam, Zainal; Tiwari, Onkar Nath; Chinnasamy, Senthil; Mohammed, Sudheer; Ani, Farid Nasir

doi:10.1016/j.enconman.2015.06.006

Cited by 82 publications

(15 citation statements)

References 69 publications

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“…Acid hydrolysis of Scenedesmus obliquus at 120°C with 2-3 N sulfuric acid for 30 min practically provided the full hydrolysis of all carbohydrate content (71-97% of carbohydrate content), with 65% made up of glucose, if a solid concentration between 20 and 500 g/L is used [17]. Scenedesmus bijugatus (26% carbohydrate content after lipid extraction), after acid hydrolysis with H 2 SO 4 (0.36-1.08 N) at 130°C, 45 min, and 20 g/L solid concentration, saccharified 84% of biomass sugars and resulted in 70% of bioethanol conversion [18]. Acidic treatment of Chlorella vulgaris FSP-E with sulfuric acid is a more efficient hydrolysis method than enzymatic treatment (with amylases and cellulases) [19], for this specie.…”

Section: Saccharification and Fermentationmentioning

confidence: 99%

Bioethanol from Microalgal Biomass: A Promising Approach in Biorefinery

Silva

Bertucco

2019

Braz. arch. biol. technol.

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The development of new technologies which increase the production of biofuel without directly compete with food production is required. Microalgal biomass has recently been in the highlight. The role of this biomass is here discussed within the concept of biorefinery and industrial sustainability of bioethanol production. The process of cultivation in order to accumulate around 50% of carbohydrates in the biomass (dry weight) and the importance of water and nutrient recycling are reviewed. Saccharification of biomass using enzymes or acids and alternative processes such as hydrothermal liquefaction and flash hydrolysis are addressed. Since the main monosaccharide in microalgal biomass is glucose, high rates of hydrolysis and fermentation were, generally, achieved (more than 80% of the efficiency as a sum of these two processes). Anaerobic digestion to treat vinasse and the recycling of CO2 from the ethanolic fermentation and biogas could increase the process sustainability. Alternative techniques for the concentration of bioethanol from fermentation broth and for the optimization of fuel transportation are mentioned. Finally, the advantage of using microalgae rather than other sources is estimated with reference to the production rate, even though the cultivation costs are still high.

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Section: Saccharification and Fermentationmentioning

confidence: 99%

Bioethanol from Microalgal Biomass: A Promising Approach in Biorefinery

Silva

Bertucco

2019

Braz. arch. biol. technol.

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“…To make them cheaper, each of the countries of the world implements its own projects to replace traditional fuels with alternative types depending on the available natural resources. Ukraine has a significant natural potential of fertile soils, which provides the production of biological raw materials for bioethanol [5][6][7][8][9]. In particular, one of the raw materials for the production of bioethanol in Ukraine is wheat.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, one of the raw materials for the production of bioethanol in Ukraine is wheat. At the same time, investor's profit in projects for the production of raw materials for bioethanol is very important for them [5,6,10,11]. Investors' profits depend on the changing project environment, which in turn causes risk.…”

Section: Introductionmentioning

confidence: 99%

Risk Assessment of Investments in Projects of Production of Raw Materials for Bioethanol

et al. 2020

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The proposed approach to quantitative assessment of the risk of investor’s profit in projects for the production of raw materials for bioethanol involves the implementation of eight stages. It systematically takes into account the stochastic nature of many factors that determine the amount of investments in the project, as well as the stochastic nature of the market value of raw materials. The use of the proposed approach makes it possible to obtain an accurate assessment of the level of risk of investors in projects for the production of raw materials for bioethanol, taking into account the requirements of investors. Based on the use of the developed application software, stochastic models of profit of investors in projects for the production of raw materials for wheat bioethanol and patterns of changes in their risk for the Western region of Ukraine are obtained. It is established that with the growth of the minimum expected profit of investors of projects from 10 to 70$/ton, the probability of its receipt varies from 0.89 to 0.34. According to a reasonable scale, the level of risk of making a profit by investors in projects for the production of raw materials for bioethanol from wheat varies from acceptable to high.

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“…The transport sector energy demand is expected to increase 60% by 2030 due to the sector expanding in the USA, Europe, and some other new industrialized and emerging economics of China and India [2]. Biofuel is a promising renewable energy source to reduce fossil fuel consumption and greenhouse gas emissions [3]. However, the competition of biofuel with food production leads to series of problems, such as fluctuation of food price, overuse of land, high cost in energy and carbon emissions [4].…”

Section: Introductionmentioning

confidence: 99%

1-Butyl-3-methylimidazolium hydrogen sulfate catalyzed in-situ transesterification of Nannochloropsis to fatty acid methyl esters

Sun

Cooke

Reddy

et al. 2017

Energy Conversion and Management

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1-Butyl-3-methylimidazolium hydrogen sulfate ([Bmim][HSO ]) is used as a solvent and an acid catalyst for in-situ extractive transesterification of wet Nannochloropsis with methanol. The reaction is supposed to be a five-step process: 1) wet algae cell wall dissolves in ionic liquid at reaction temperatures; 2) hydrogen ions and sulfate ions release from the ionization of HSO 4-. The hydrogen ions (H +) act as catalysts for accelerating the reactive extraction of triglyceride from wet Nannochloropsis; 3) Hydrogen ions and methanol molecules transfer from bulk to active site of cells without passing through cell wall that is dissolved by ionic liquid; 4) In-situ transesterification of lipid (mainly triglycerides) with methanol; 5) Products transfer from inside of algae cells to outside of cells. The crude biodiesel yield of [Bmim][HSO 4 ] catalyzed in-situ transesterification is about 95.28% at reaction temperature of 200 o C, reaction time of 30 minutes, mass ratio of [Bmim][HSO 4 ] to wet Nannochloropsis of 0.9:1, and a mass ratio of methanol to wet algae of 3:1. It decreases to 81.23% after [Bmim][HSO 4 ] is recycled for 4 times, which indicates that [Bmim][HSO 4 ] catalyzed in-situ transesterification is an economic approach for biodiesel production from wet algae.

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An integrated approach for biodiesel and bioethanol production from Scenedesmus bijugatus cultivated in a vertical tubular photobioreactor

Cited by 82 publications

References 69 publications

Bioethanol from Microalgal Biomass: A Promising Approach in Biorefinery

Bioethanol from Microalgal Biomass: A Promising Approach in Biorefinery

Risk Assessment of Investments in Projects of Production of Raw Materials for Bioethanol

1-Butyl-3-methylimidazolium hydrogen sulfate catalyzed in-situ transesterification of Nannochloropsis to fatty acid methyl esters

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