Air Flotation System Treatment Efficiency

1. Removal Rates for Key Pollutants

Pollutant	Removal Efficiency
Suspended Solids (SS)	85–95% removal efficiency
Oils & Greases (O&G)	90–98% removal efficiency
Biological Oxygen Demand (BOD)	50–70% reduction
Chemical Oxygen Demand (COD)	40–60% reduction

2. Factors Affecting Efficiency

Bubble Size & Distribution: Microbubbles (30–100 μm) improve contaminant adhesion.
Chemical Coagulants/Flocculants: Adding polymers (e.g., alum, ferric chloride) can boost efficiency by 10–20%.
Hydraulic Retention Time (HRT): Longer retention (15–30 minutes) enhances separation.
Wastewater Composition: Higher influent contaminant concentrations may reduce efficiency.

3. Comparison with Other Technologies

Air flotation typically outperforms sedimentation in removing light particles and oils.

When combined with dissolved air flotation (DAF), efficiency reaches >95% for emulsified oils.

4. Industry-Specific Performance

Food & Beverage

90%+ SS and FOG removal

Petrochemical

85–95% oil separation

Pulp & Paper

70–80% COD reduction

For optimal efficiency: Regular maintenance (e.g., skimmer adjustment, nozzle cleaning) and proper chemical dosing are critical. Advanced systems with automated controls can further stabilize performance.

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