LandfillLeachate DAF System for Leachate Treatment

Dissolved air flotation description

Dissolved-air flotation (DAF) is a specialized air flotation technique used predominantly in the treatment of wastewater and industrial effluents. By utilizing the principle of buoyancy, DAF processes effectively separate solids from liquids, making the treatment process optimal for various applications. The method operates on the fundamental concept of introducing fine air bubbles into the wastewater, which attach to suspended solids. This attachment enables the solids to rise to the surface, resulting in the formation of a concentrated sludge layer, thus allowing for efficient water clarification.

Dissolved air flotation principle

The operational effectiveness of dissolved-air flotation processes can be largely attributed to the unique mechanism through which air bubbles facilitate the separation of solids from liquids. Initially, raw wastewater is introduced into a flotation tank, where it is pre-treated to prepare it for flotation. This pre-treatment commonly involves the addition of coagulants and flocculants, which help agglomerate fine particles into larger flocs.

Next, a high-pressure pump draws water from the flotation tank and saturates it with air, producing dissolved air at a concentration greater than it can hold at atmospheric pressure. Upon reaching the flotation chamber, pressure is released, and the excess air comes out of the solution, forming tiny bubbles that adhere to the suspended and colloidal particles within the wastewater. These adhered particles become buoyant and rise to the water's surface, forming a sludge layer that can be skimmed off. This mechanical method increases the overall efficiency of contaminant removal, resulting in treated water of higher clarity.

Dissolved air flotation technical sheet

Dissolved air flotation process flow

Dissolved air flotation advantage

High Removal Efficency with Low Operational Costs.
DAF systems provide the flexibility to extract water throughout the process, extending retention time and improving effluent quality.
The technology provides high removal efficiency while maintaining low power and chemistry requirements.
Improved Separation and Sludge Removal.
Plate separators maximize the removal of solids.
The cross-flow design facilitates lower water velocities and better solid separation.
Systems accumulate thicker, denser sludge on the thickening beach and feature a cone bottom design for easy sludge removal.
Rugged Design, Long Life.
Heavy-duty, lightweight polypropylene (PP) construction.
Corrosion resistance.
High total dissolved solids (TDS) and saltwater tolerance.
Chemical treatment flexibility.
Wide pH range.
Up to 9,000 gallons per minute systems available.

Dissolved air flotation feature

The environmental impact of DAF systems is generally positive, particularly in minimizing water pollution. By enabling the removal of over 90% of harmful components from industrial effluents, DAF systems contribute to cleaner water bodies and reduced environmental pollution. Moreover, reduced chemical usage and advancements in energy-efficient designs further enhance the sustainability of DAF technology.

Dissolved air flotation application

Fats, Oils, & Grease (FOB) Removal
Wastewater Pre-treatment
Wastewater  Tertiary Treatment (P removal)
Sludge Thickening
Anaerobic/Aerobic Post Treatment and Sludge Separation
Filter Back Wash treatment

Contact Us for a Consultation

• Company: Wuxi Dajiang Environmental Technology Co., Ltd.  DAGYEE
• Phone/WhatsApp:+8613961861780
• Email: info@dagyee.com
• Website: www.dagyee.com