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Related Concept Videos

Coagulation01:06

Coagulation

366
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...
366

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Related Experiment Video

Updated: Sep 6, 2025

Coupling Carbon Capture from a Power Plant with Semi-automated Open Raceway Ponds for Microalgae Cultivation
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A Novel Salt-Bridge Electroflocculation Technology for Harvesting Microalgae.

Yuyong Hou1,2,3, Chenfeng Liu1, Zhiyong Liu1,3

  • 1Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China.

Frontiers in Bioengineering and Biotechnology
|July 5, 2022
PubMed
Summary

This study introduces salt-bridge electroflocculation (SBEF) for efficient microalgae harvesting. This novel method significantly reduces energy consumption while improving biomass recovery and quality for various applications.

Keywords:
Nannochloropsis oculataharvestingmicroalgaerecovery efficiencysalt-bridge electroflocculation

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Chemical Engineering

Background:

  • Microalgae biomass is a valuable feedstock for biofuels, pharmaceuticals, and food.
  • Current microalgae harvesting methods are energy-intensive and inefficient, posing a significant bottleneck.
  • Existing electro-flocculation techniques face challenges with cell destruction and contamination.

Purpose of the Study:

  • To develop a novel, energy-efficient, and cost-effective microalgae harvesting technique.
  • To improve the recovery efficiency and quality of microalgae biomass.
  • To overcome the limitations of conventional electro-flocculation methods.

Main Methods:

  • Development of a salt-bridge electroflocculation (SBEF) technique.
  • Integration of alkali-induced flocculation with electrolysis using non-sacrificial carbon electrodes.
  • Optimization of parameters such as current and time for harvesting.

Main Results:

  • Achieved a high harvesting efficiency of 90.4% with low energy consumption (1.50 Wh/g biomass).
  • Increased microalgae floc size by 3.85-fold (from 2.75 to 10.59 µm), facilitating downstream processing.
  • The salt-bridge prevented anode oxidation and avoided external contamination, preserving biomass integrity.

Conclusions:

  • The proposed SBEF technology offers an efficient and low-cost solution for microalgae harvesting.
  • SBEF enhances biomass recovery and quality, making it suitable for industrial applications.
  • This method addresses critical technical defects in traditional electro-flocculation processes.