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A holistic approach for harnessing multifarious pretreatment techniques and transesterification process optimization of Coelastrella biomass for biodiesel via central composite design

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  • Yin, Peng
  • Thanh Nguyen, Cong

Abstract

A cost-effective and energy-efficient pretreatment method and solvent system is imperative for economically viable lipid extraction from microalgae. Additionally, optimizing the transesterification process to select optimal parameters that aid in enhanced biodiesel production is also a crucial obstacle. Therefore, the present study compares and optimizes several lipid extraction methods and solvents based on their total lipid extraction efficiency from the test culture Coelastrella sp. using a central composite design (CCD). Further, optimization of acid-catalyzed transesterification parameters was also investigated using CCD, and the produced biodiesel was analyzed for fatty acid composition. Among the methods and solvents, the Soxhlet method and Chloroform: Methanol (2:1) solvent system showed higher lipid recovery at about 24.55 % over other pretreatment methods and solvents studied. CCD optimization reveals that the optimal variables for high lipid recovery are 50 rpm stirring speed, 45 mL chloroform: methanol solvent volume, 80 °C temperature, and 150 min reaction time. Further, the relative abundance of neutral lipids, phospholipids, and glycolipids in the total lipids of the Coelastrella sp. are estimated to be 56.47, 19.42, and 24.10 %, respectively. Acid-catalyzed transesterification process optimization by CCD reveals 120 min reaction time, 80 °C temperature, 11 mL methanol, and 5 % HCl concentration are optimal factors for achieving higher biodiesel yield at about 69 %. Eventually, the fatty acid compositional analysis showed C16:0 and C18:1 as vital fatty acids in the biodiesel at about 20 % and 14.56 %, respectively.

Suggested Citation

  • Yin, Peng & Thanh Nguyen, Cong, 2025. "A holistic approach for harnessing multifarious pretreatment techniques and transesterification process optimization of Coelastrella biomass for biodiesel via central composite design," Renewable Energy, Elsevier, vol. 246(C).
    • Handle: RePEc:eee:renene:v:246:y:2025:i:c:s0960148125005981
    DOI: 10.1016/j.renene.2025.122936
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    References listed on IDEAS

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    1. Wang, Yi-Tong & Cong, Wen-Jie & Zeng, Ya-Nan & Zhang, Yu-Qing & Liang, Jing-Long & Li, Jun-Guo & Jiang, Li-Qun & Fang, Zhen, 2021. "Direct production of biodiesel via simultaneous esterification and transesterification of renewable oils using calcined blast furnace dust," Renewable Energy, Elsevier, vol. 175(C), pages 1001-1011.
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    1. Shi, Yue & Wang, Ruxian & Tian, Encai & Xing, Yuchen & Li, Fan & Lu, Zheng, 2026. "Co-production of biohydrogen and biodiesel from different microalgae by ultrasound, anaerobic fermentation and lipid extraction," Renewable Energy, Elsevier, vol. 258(C).

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