Air Flotation Sewage Treatment Process

1. Sewage Pretreatment Stage

Initial treatment steps to prepare wastewater for air flotation:

Screen filtration removes large particle impurities
Equalization tank mixes wastewater for uniform quality
Lift pumps transport water to main unit
Flow rate controlled within optimal range

Flow rate control: 2-5 m³/h per unit width

2. Dissolved Air System Operation

Pressurized system creates microbubbles for flotation:

Clean water and compressed air mixed in proper ratio
Dissolved under pressure in air tank
High dissolved oxygen concentration achieved
Efficient microbubble generation

3. Air Flotation Separation

Key separation process where contaminants are removed:

Pressure release creates fine microbubbles
Bubbles attach to suspended particles
Buoyant floc forms (density < water)
Inclined tube sedimentation enhances separation

4. Clean Water & Sludge Discharge

Final separation and collection processes:

Clarified water collected from bottom
Part recycled to dissolved air system
Remainder discharged as treated water
Surface scum scraped to sludge tank

5. System Collaborative Control

Automated process optimization:

PLC automatic adjustment of key parameters
Real-time turbidity monitoring
Dynamic control of air pressure, reflux ratio
Adaptive scraping frequency

Typical parameters:
Dissolved air pressure: 0.3-0.5 MPa
Reflux ratio: 20-30%
Retention time: 15-30 minutes

This air flotation system achieves efficient sewage treatment through optimized pretreatment, precise dissolved air control, effective separation, and automated process management.

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