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Coagulation

Coagulation

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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Enhancing the electrocoagulation process for harvesting marine microalgae (Tetraselmis sp.) using interdigitated

Wardan A Khatib¹, Arslan Ayari¹, Ahmed T Yasir²

¹Department of Civil and Architectural Engineering, Qatar University, P.O. Box 2713, Doha, Qatar.

Journal of Environmental Management

|May 11, 2021

Summary

A novel electrode array effectively harvests marine microalgae using dielectrophoretic (DEP) force during electrocoagulation. This method significantly improves efficiency and reduces energy consumption compared to traditional techniques.

Keywords:

Dielectrophoresis: harvesting efficiency Electric intensification Electrocoagulation Marine microalgae

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Area of Science:

Biotechnology
Electrochemistry
Marine Biology

Background:

Algal biomass is increasingly valuable for diverse applications.
Efficient harvesting of microalgae is crucial for industrial viability.
Conventional methods face limitations in efficiency and energy use.

Purpose of the Study:

To evaluate a novel cylindrical interdigitated electrode array for microalgae electrocoagulation.
To investigate the role of dielectrophoretic (DEP) force in enhancing microalgae harvesting.
To compare the performance and energy efficiency against traditional electrode designs.

Main Methods:

Numerical simulation to confirm dielectrophoretic force induction.
Electrocoagulation experiments using Tetraselmis sp. with the novel electrode array.
Optimization of electrolysis time, electrode distance, and current density.

Main Results:

Dielectrophoretic force was successfully induced by the novel electrode array.
Achieved 82.4% microalgae harvesting efficiency at 1 cm electrode distance and 50 mA/cm².
Increased harvesting efficiency to 96.18% by reducing electrode distance to 0.5 cm.
Demonstrated 38% lower specific energy consumption compared to flat sheet electrodes.

Conclusions:

The cylindrical interdigitated electrode array is a highly effective tool for microalgae harvesting.
Dielectrophoretic force significantly contributes to improved harvesting efficiency.
The novel design offers a more energy-efficient alternative for algal biomass processing.