Biodiesel production from wet microalgae feedstock using sequential wet extraction/transesterification and direct transesterification processes

Chen, Ching Lung; Huang, Chien Chang; Ho, Keang-Po; Hsiao, Ping Xuan; Wu, Meng; Chang, Jo Shu

doi:10.1016/j.biortech.2015.07.021

Cited by 106 publications

(19 citation statements)

References 35 publications

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“…This reaction is classified into two categories, catalyzed and noncatalyzed. Catalyzed transesterification process can be achieved by homogeneous, heterogeneous or enzymatic catalysts [9,10]. The most substantial procedure for transesterification reaction is using homogenous acid/base catalysts [11].…”

Section: Introductionmentioning

confidence: 99%

Assessment of fuel properties on the basis of fatty acid profiles of oleaginous yeast for potential biodiesel production

Patel

Arora

Mehtani

et al. 2017

Renewable and Sustainable Energy Reviews

188

100

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A B S T R A C TOver the last decade, there has been a huge upsurge of interest in sustainable production of biomass-based biofuels to fulfill the existing energy demand and simultaneously reducing the environmental deterioration. Earlier, vegetable oils and animal fats were utilized for biodiesel production, but due to food crisis and environmental sustainability, renewable sources such as neutral lipid derived from microbes are gaining much attention for budding biodiesel industries. Among various types of microorganisms, oleaginous yeasts are more promising feedstock to accomplish the current demand of biodiesel production and utilize a large number of cost-effective renewable substrates for their growth and lipid accumulation. However, biodiesel obtained from oleaginous yeasts have certain restrictions regarding their commercial utilization due to their unstable fuel properties such as oxidative stability, cetane number, viscosity and low-temperature performance etc. Numerous articles have been published in the public domain describing the fatty acid profiles of oleaginous yeast as feedstock for biodiesel production. However, the evaluation of quality parameters of biodiesel obtained from oleaginous yeasts is still in infancy. Although there is a huge disparity in a number of papers published for biodiesel production yet the reporting performance on diesel engines need to be verified in details. In this review article, attempt has been made to assess the important biofuel properties on the basis of the fatty acid profile of oleaginous yeast. Thus this evaluation would provide a guideline to the biodiesel producer to improve the production plans related to feedstocks for oleaginous yeast, culture conditions and biodiesel blending.

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Section: Introductionmentioning

confidence: 99%

Assessment of fuel properties on the basis of fatty acid profiles of oleaginous yeast for potential biodiesel production

Patel

Arora

Mehtani

et al. 2017

Renewable and Sustainable Energy Reviews

188

100

View full text Add to dashboard Cite

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“…Several methods have been tested to harvest microalgae, including gravity sedimentation (Depraetere et al, 2015), centrifugation (Chen et al, 2015), filtration (Nurra et al, 2014) and chemical flocculation (Reyes and Labra, 2016). Gravity settling is simple but only suitable to harvest microalgae with large size (Park and Craggs, 2010).…”

Section: Introductionmentioning

confidence: 99%

Synergy of flocculation and flotation for microalgae harvesting using aluminium electrolysis

Shi

Zhu

Chen

et al. 2017

Bioresource Technology

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Microalgae are often used as feedstock for renewable biofuel production and as pollutant up-takers for wastewater treatment; however, biomass harvesting still remains a challenge in field applications. In this study, electro-flocculation using aluminium electrolysis was tested as a method to collect Chlorella vulgaris. The electrolysis products were positively charged over a wide pH range below 9.5, which gave them a flocculation potential for negatively charged microalgae. As flocculants were in-situ generated and gradually released, microalgae flocs formed in a snowballing mode, resulting in the compaction of large flocs. When higher current density was applied, microalgae could be harvested more rapidly, although there was a trade-off between a higher energy use and more residual aluminium in the culture medium. Benefits of this flocculation method are twofold: the phosphate decrease in post-harvesting could improve nutrient removal in microalgae based wastewater treatment, while the ammonium increase may favor microalgae recovery for medium recycling.

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“…It has been demonstrated that both chemical ways and enzymatic ways can be used for biodiesel conversion with microalgae oil [5][6][7]. Compared with the conventional chemical catalysis, enzymatic ways have shown distinctive features of mild reaction conditions, a low ratio of alcohol to oil and waste-free during the process [8][9][10][11]. Among different forms of biocatalysts, immobilized lipase has been widely investigated for biodiesel preparation, due to the fact that the immobilized lipase can be easily reused and has a good thermal as well as pH stability [12,13].…”

Section: Introductionmentioning

confidence: 99%

Efficient Biodiesel Conversion from Microalgae Oil of Schizochytrium sp.

et al. 2019

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Microalgae oil has been regarded as a promising feedstock for biodiesel production. However, microalgae oil usually contains some non-lipid components, such as pigments. Microalgae oil could be converted to biodiesel effectively with a two-step process to decrease the negative effect caused by by-product glycerol generated in traditional biodiesel production process. Firstly, microalgae oil was hydrolysed to free fatty acids (FFAs) and then FFAs were converted to methyl ester. In this study, the hydrolysis of microalgae oil from Schizochytrium sp. was systematically investigated and microalgae oil could be hydrolysed effectively to FFAs at both non-catalytic and acid-catalytic conditions. The hydrolysis degree of 97.5% was obtained under non-catalytic conditions of 220 °C and a water to oil ratio of 10:1 (w:w). The hydrolysis degree of 97.1% was obtained with the optimized sulphuric acid catalytic conditions of 95 °C, and a ratio of water to oil 3:1. The lipase Novozym435-mediated esterification with the hydrolysed FFAs was explored and a FAME (Fatty Acids Methyl Ester) yield of 95.1% was achieved. The conversion of different FFAs also was compared and the results indicated that lipase Novozym435-mediated methanolysis was effective for the preparation of biodiesel as well as poly unsaturated fatty acids (PUFAs).

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Biodiesel production from wet microalgae feedstock using sequential wet extraction/transesterification and direct transesterification processes

Cited by 106 publications

References 35 publications

Assessment of fuel properties on the basis of fatty acid profiles of oleaginous yeast for potential biodiesel production

Assessment of fuel properties on the basis of fatty acid profiles of oleaginous yeast for potential biodiesel production

Synergy of flocculation and flotation for microalgae harvesting using aluminium electrolysis

Efficient Biodiesel Conversion from Microalgae Oil of Schizochytrium sp.

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