Automatic Air Flotation Clarifier for Oil-Water Separation

Automatic Air Flotation Clarifier for Oil-Water Separation

Product Item : DAF-010
Category： DAF Dissolved Air Flotation
Certification:CE Certificate
Capacity:1-200 m3/h
Material：Q235B ss304 ss316
Solid-liquid separation technology
INQUIRY EMAIL

Dissolved Air Flotation Description

Dissolved air flotation is a water treatment process that clarifies wastewater by removal of suspended solids, oils, greases, BOD, COD, and metals. This is achieved by dissolving air in the wastewater under pressure and then releasing the air at atmospheric pressure in a flotation tank. The released air forms tiny bubbles which adhere to the suspended matter causing it to float to the surface of the water where it can then be removed by a skimming device, ready to dewater for proper disposal. To improve solids removal coagulant/flocculants are added to coax suspended solids and colloidal particles into clumping together.

Dissolved Air Flotation Feature

Typically, DAF is used to clarify wastewater from food processing plants, industrial laundries, oil refineries, paper mills, metal finishing, and many other niche industries so water is suitable for reuse or discharge to sewer.

Reduced Footprint
Lower Compliance Costs
High Efficiency
High Quality Treated Water
Increase Reuse Rates

Dissolved Air Flotation Fuction

1. Presaturation
The initial step involves saturating the wastewater with air under pressure. In a pressure vessel, air is dissolved in the water at pressures ranging from 3 to 6 atmospheres, which results in a high concentration of dissolved air.
2. Release of Pressure and Formation of Bubbles
Once the pressurized air-saturated water is released into the flotation tank, the pressure drop causes the air to precipitate as fine bubbles. These micro-bubbles (typically 30-50 micrometers in diameter) adhere to the suspended particles in the water.
3. Flotation
As the bubbles rise, they carry the attached particles to the surface of the flotation tank. This creates a floating layer of sludge on the surface, which can then be mechanically skimmed off.
4. Sedimentation
The clarified water, now largely free of suspended solids, is discharged from the bottom of the flotation tank, often going on to further treatment or being discharged as final effluent.

Dissolved Air Flotation Applications