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The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
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Experimental Protocol for Biodiesel Production with Isolation of Alkenones as Coproducts from Commercial Isochrysis Algal Biomass
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Biodiesel production from wet microalgae feedstock using sequential wet extraction/transesterification and direct

Ching-Lung Chen1, Chien-Chang Huang2, Kao-Chia Ho1

  • 1Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan.

Bioresource Technology
|July 22, 2015
PubMed
Summary
This summary is machine-generated.

This study presents a novel, cost-effective method for producing biodiesel from wet microalgae using microwave disruption and direct transesterification. This approach achieves high oil recovery and biodiesel conversion, overcoming key technological barriers in microalgal biodiesel production.

Keywords:
BiodieselDirect transesterificationMicrowave disruptionOil extractionWet microalgae

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Chemical Engineering

Background:

  • Producing biodiesel from microalgae is promising but hindered by inefficient conversion of wet microalgal biomass.
  • Existing methods often require costly and time-consuming pre-treatment steps, limiting economic viability.

Purpose of the Study:

  • To develop a novel, rapid, and cost-effective method for biodiesel production directly from wet microalgae.
  • To optimize conditions for microwave-assisted disruption, partial dewatering, oil extraction, and transesterification.

Main Methods:

  • Utilized microwave disruption and a combination of methanol treatment and low-speed centrifugation for partial dewatering of wet microalgae (Chlamydomonas sp. JSC4).
  • Optimized hexane-methanol solvent extraction and subsequent transesterification, including direct transesterification of disrupted biomass.
  • Investigated simultaneous chlorophyll removal during transesterification.

Main Results:

  • Achieved 96.2% oil recovery under optimized extraction conditions (45°C, hexane/methanol ratio 3:1, 80 min).
  • Reached 97.2% biodiesel conversion within 15 min at 45°C with a 6:1 solvent/methanol ratio, including chlorophyll removal.
  • Obtained nearly 100% biodiesel conversion via direct transesterification of disrupted wet microalgal biomass.

Conclusions:

  • The developed method offers a significant advancement for efficient and economical biodiesel production from wet microalgae.
  • Microwave disruption and direct transesterification are viable strategies to overcome technological challenges in microalgal biodiesel processing.
  • This approach streamlines the process, reducing costs and increasing the potential for large-scale microalgal biodiesel implementation.