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Published on: September 7, 2018
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Mass transfer and multi-phase fluid flow in electro-coagulation: A review
Yanqing Fang1, Yan Huang2, Xingyu He1
1School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang Jiangsu 212003, China.
Water Research
|May 1, 2025
Summary
Electrocoagulation (EC) uses electro-generated coagulants to form flocs that remove pollutants. This review highlights how multi-phase fluid flow and mass transfer critically impact EC performance, pollutant removal, and energy efficiency.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Electrochemistry
Background:
- Electrocoagulation (EC) utilizes electro-generated coagulants (Fe2+ or Al3+) and hydroxide ions (OH-) to form flocs.
- These flocs remove pollutants via adsorption, complexation, and ligand exchange.
- Understanding fluid dynamics and mass transfer is key to optimizing EC.
Purpose of the Study:
- To review recent literature on multi-phase fluid flow and mass transfer in electrocoagulation.
- To analyze the impact of these factors on floc generation, pollutant removal, and energy consumption.
- To provide insights and guidelines for enhancing EC performance.
Main Methods:
- Literature review focusing on multi-phase fluid flow (bubbles, flocs) and mass transfer of electro-generated species.
- Analysis of modeling approaches, including simplified and coupled models for electric field, concentration, and flow fields.
- Examination of the influence of local pH profiles versus initial pH on floc formation and pollutant removal.
Main Results:
- Multi-phase fluid flow significantly affects EC performance.
- Mass transfer of coagulants and OH- influences floc generation.
- Local pH or pH profiles are more critical for floc generation and pollutant removal than initial pH values.
- Coupled modeling provides a comprehensive understanding of EC processes.
Conclusions:
- Multi-phase fluid flow and mass transfer are crucial for effective electrocoagulation.
- Optimizing local pH conditions is vital for maximizing pollutant removal.
- Advanced modeling integrating fluid flow and mass transfer can improve EC design and efficiency.
- This review offers insights for future development in EC technology.
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