Dissolved Air Flotation is a water treatment process that clarifies wastewaters (or other waters) by the removal of suspended matter such as oil or solids.

The removal is achieved by dissolving air in the water or wastewater under pressure and then releasing the air at atmospheric pressure in a flotation tank basin. The released air forms tiny bubbles which adhere to the suspended matter causing it to float to the surface where it can be removed by a skimming device.

The wastewater enters RT1 (coagulation reaction tank) and RT2 (flocculation reaction tank) from the equalization tank through the lift pump, and coagulates with PAC, flocculates with PAM respectively to form flocs.

The wastewater and dissolved water then enter the reaction zone of the DAF tank, where microbubbles and flocs in the dissolved water mix and adhere to form solid particles with density less than water, which float to the surface. Under buoyancy, scum is scraped to the slag tank while clean water is collected through the water collecting pipe.

• High efficiency dissolved air system with at least 95% efficiency
• Liquid level control for automatic slagging with scum moisture content less than 98%
• Non-clogging design for easy maintenance
• Stable treatment efficiency with automatic control for unattended operation
• Compact footprint with high effluent quality and low investment

• Wastewater type (dairy, car washing, slaughter house, food processing, river water, etc.)
• SS content (ppm or mg/L)
• Oil & Grease & Fat (FOG) content (ppm or mg/L)
• PH (6-9 preferred; corrosive substances may require special materials)
• BOD and COD levels (ppm or mg/L)

• Municipal Sewage
• Slaughter House Wastewater
• Metallurgical Industry Wastewater
• Spraying Sewage
• Printing & Dyeing Sewage
• Metal-Processing Sewage
• Mining Stone Wastewater
• Electronic Sewage

Shanghai Ecopro Environmental Engineering Co., Ltd. is a professional environmental engineering company specializing in water and wastewater treatment equipment and separation services. We provide comprehensive solutions including static screens, rotary drum screens, lamella clarifiers, dissolved air flotation systems, electrochemistry systems, and various other water treatment technologies.