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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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A continuous flocculants-free electrolytic flotation system for microalgae harvesting.

Shanshan Luo1, Richard Griffith2, Wenkui Li3

  • 1State Key Laboratory of Food Science and MOE Biomass Energy Center, Nanchang University, Nanchang, 330031, China; Center for Biorefining, and Bioproducts and Biosystems Engineering Department, University of Minnesota, 1390 Eckles Ave., Saint Paul, MN 55108, USA; Jiangxi Science and Technology Normal University, Nanchang 330013, China.

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Summary

This study introduces a novel, chemical-free electrolytic flotation method for microalgae harvesting. This efficient process reduces costs and contamination, making microalgae production more viable for food and feed applications.

Keywords:
Chlorella vulgarisElectrode designElectrolytic flotationFlocculants-freeHarvesting efficiency

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Area of Science:

  • Biotechnology
  • Chemical Engineering
  • Environmental Science

Background:

  • Commercial microalgae production faces challenges with high harvesting costs and water reuse.
  • Current methods often rely on chemical flocculants, leading to contamination concerns.

Purpose of the Study:

  • To investigate a flocculant-free electrolytic flotation process for efficient microalgae harvesting.
  • To evaluate electrode materials and designs for optimal harvesting performance.

Main Methods:

  • Electrode materials (stainless steel cathode, carbon anode) and designs were assessed for harvesting efficiency.
  • A pilot-scale continuous harvesting system was constructed and tested.

Main Results:

  • The selected electrode configuration achieved a biomass yield of 23.72 g/h.
  • The process demonstrated a power consumption of 2.73 kWh/kg.

Conclusions:

  • The flocculant-free electrolytic flotation system offers an efficient and cost-effective method for microalgae harvesting.
  • This technology minimizes chemical contamination and energy requirements, showing promise for food and feed applications.