Dissolved Air Flotation Description

The DAF unit technology uses extremely small air bubbles to lift suspended solids and oil to the top surface. The formed sludge layer is scraped into a sludge holding tank. The addition of coagulation and flocculation chemicals may be required to enhance the performance.

Removal efficiency is usually superior to gravity bases systems and often applied as polishing step (downstream of CPI).
The DAF unit can be supplied with a gas-tight cover, coagulation & flocculation dosing and mixing equipment and air-saturation by special pumps or in separate pressure vessel.

Dissolved Air Flotation Feature

The DAF system is a high-performance system with distinguishing features.

It includes a single movement separator, which rotates against the hydraulic flow of the water, helping to minimise the skimming distance of the floated sludge and eliminating solids carry-over.

It creates a sludge with a dry solids content 3 to 4 times greater than conventional systems. The result of which, is a reduction in the need for and scale of any future treatment, such as de-watering or drying, consequently resulting in reduced follow-on costs.

The bottom sludge within the system is held in place as it thickens and partially de-watered by the shaftless auger system. This enables the operator to control the sludge thickness, eliminates the early-removal of solids and reduces the build-up of sludge. The residual sludge is then transported to a central discharge point and removed via an automatic pneumatic valve. This discharge cycle is self-cleaning, and any particles adhered to the walls or sides of the system will loosen and follow their initial flow path.

Dissolved Air Flotation Available Options

Access platforms with ladder or stairs
Automatic sludge pump out packages
Chemical pretreatment systems
Concrete tank designs for large in ground installations
Duplex systems for redundancy
Effluent monitoring
Effluent sampling
Explosion-proof design
Flash mix/flocculation tanks with mixers
Full FRP or stainless steel construction
Influent equalization
Influent / effluent lift stations
Instrumentation and controls
Removable covers with gaskets
Integral mechanical sludge thickener
On board reagent storage (day tanks)
Pilot size units for on-site testing
Potable water design
Special coatings
Sludge handling and dewatering

30m3/hr Dissolved Air Flotation Specification

Dissolved Air Flotation Applications

Industrial Wastewater Treatment

Aquaculture
Tanneries
Pulp & paper
Slaughterhouses
Food processing
Breweries and wineries