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Related Experiment Video

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Efficient microalgae harvesting using a thermal flotation method with response surface methodology.

Xiaotong Zou1, Kaiwei Xu1, Hao Wen1

  • 1School of Environmental Science and Engineering, Chang'an University, Xi'an 710054, China

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|October 10, 2019
PubMed
Summary
This summary is machine-generated.

Thermal pre-flocculation enhances microalgae harvesting efficiency. This eco-friendly method optimizes conditions for collecting Chlorella vulgaris and Scenedesmus obliquus for biofuels.

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Chemical Engineering

Background:

  • Microalgae harvesting is crucial for biofuel production.
  • Dispersed air flotation is a promising, yet understudied, microalgae collection method.
  • Thermal pre-flocculation offers an economical and eco-friendly approach.

Purpose of the Study:

  • To investigate the mechanism of thermal pre-flocculation for microalgae harvesting.
  • To optimize thermal flotation conditions for Chlorella vulgaris and Scenedesmus obliquus.
  • To analyze microalgal surface changes induced by thermal pre-flocculation.

Main Methods:

  • Microalgae surface analysis using FT-IR, SEM, zeta potential, and hydrophobicity tests.
  • Optimization of thermal flotation parameters using Response Surface Methodology (RSM).
  • Harvesting efficiency assessment for Chlorella vulgaris and Scenedesmus obliquus.

Main Results:

  • Scenedesmus obliquus exhibited higher hydrophobicity and was harvested more efficiently (88.16%) than Chlorella vulgaris (47.16%).
  • Thermal pre-flocculation denatured cell surface components, reducing electrostatic repulsion and enhancing bubble adhesion.
  • Optimal harvesting efficiency of 91.96% was achieved at 70 °C, 1,412 rpm, and 13.36 min.

Conclusions:

  • Thermal pre-flocculation is an effective method for enhancing microalgae harvesting via dispersed air flotation.
  • Optimized thermal flotation conditions significantly improve harvesting yields for biofuel applications.
  • This technology presents a sustainable solution for microalgae biomass production.