What is Dissolved Air Flotation (DAF)?
DAF is a water treatment process that removes suspended solids, oils, fats, and colloidal particles by injecting microbubbles (<100 microns) that attach to contaminants, causing them to float to the surface for skimming.
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![Dissolved Air Flotation Systems Design]()
Dissolved Air Flotation Systems DesignWe engineer high-efficiency Dissolved Air Flotation (DAF) systems for challenging water/wastewater applications – removing oils, greases, TSS, algae, and industrial slurries where gravity separation falls short.view more
Advantages of DAF
High-Efficiency Removal
Targets light particles that gravity settlers cannot remove (e.g., algae, oils).
Compact Footprint
Faster than sedimentation; requires less space.
Rapid Treatment
Short hydraulic retention time (10–30 mins).
Low Sludge Production
Concentrated sludge reduces disposal costs.
Adaptability
Handles variable influent loads and viscosities.
Main Features
Saturation System
Pressurizes air-dissolved water (3–6 bar).
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Release Mechanism
Creates microbubbles via pressure reduction valves.
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Flocculation Zone
Pre-treatment for particle aggregation (enhances bubble adhesion).
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Surface Skimmer
Removes floated sludge blanket automatically.
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Recycle Rate
10–30% of flow (key for microbubble density).
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Types of DAF Systems
Conventional DAF
Standard pressurized air dissolution + flotation tank.
Induced Air Flotation (IAF)
Mechanical air injection (larger bubbles; less efficient).
Zero Recycle DAF
Direct pressurization of full flow (rare; high energy use).
High-Rate DAF
Integrated lamella plates for enhanced separation.
Dissolved Ozone Flotation (DOF)
Combines ozone oxidation with flotation.
Applications
Industrial Wastewater
Oil refineries, food processing (FOG removal), paper mills.
Municipal WWTPs
Primary treatment, sludge thickening (WAS).
Drinking Water
Algae, natural organic matter (NOM), and color removal.
Marine/Ports
Bilge water treatment (oil separation).
Aquaculture
Effluent solids/oil removal.
Recycling Plants
Wash-water purification.
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