This is a Dissolved Air Flotation (DAF) system, a widely adopted technology in modern wastewater treatment processes. Designed for efficient solid-liquid separation, the system features a compact structure, optimized layout, and stable performance. It plays a crucial role in removing suspended solids, oils, and other contaminants from wastewater.
The treatment process begins in the flocculation zone, where coagulants and flocculants—typically PAC (poly aluminium chloride) and PAM (polyacrylamide)—are added to the incoming wastewater. These chemicals react with suspended matter, forming larger, heavier flocs. From there, the mixture enters the contact zone of the DAF unit.
Within the contact zone, saturated water—created by mixing clean water with compressed air in the air-dissolving tank—is released through microbubble generators. These generators produce fine air bubbles approximately 30 to 50 micrometers in diameter. As the microbubbles come into contact with the flocculated particles, they attach to them, significantly reducing their density and causing the solids to float to the surface.
The floating sludge, now at the top of the separation zone, is continuously removed by a skimmer system. This skimmer, driven by a non-metallic chain and equipped with multiple scraping plates, spans the entire width of the tank to ensure stable and reliable sludge removal. Meanwhile, the clarified water settles at the bottom and flows into the clean water tank.
A portion of this clean water is recirculated to the air-dissolving system to maintain the microbubble generation process, while the rest is discharged or reused, depending on the application. The air-dissolving tank is equipped with advanced anti-clogging technology to ensure uninterrupted operation. Even if a microbubble generator becomes blocked, it can be serviced without shutting down the system, making the entire process highly efficient and maintenance-friendly.
Overall, the DAF system offers a robust and effective solution for treating wastewater, making it a valuable asset in municipal, industrial, and commercial applications.
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Frequently Asked Questions
How does the dissolved air flotation process work?
Treatment starts in the flocculation zone, where PAC and PAM coagulants react with suspended matter to form larger flocs. The mixture enters the contact zone, where saturated water from the air-dissolving tank is released through microbubble generators, producing fine bubbles 30–50 micrometers in diameter. The bubbles attach to the flocs, float them to the surface, and a skimmer removes the sludge while clarified water settles below.
What is the treatment capacity of this unit?
This model treats 20 m³/h. For smaller water flows, a compact 5 m³/h DAF system is also available — size the unit to your washing line’s water turnover so the loop stays balanced.
What contaminants does it remove?
The system removes suspended solids, oils, and other contaminants from wastewater. In plastic recycling these are exactly the pollutants wash lines generate, so the DAF unit keeps the recirculated water clean enough for reuse.
Where does the treated water go?
Clarified water settles at the bottom and flows into the clean water tank. A portion is recirculated to the air-dissolving system to maintain microbubble generation, while the rest is discharged or reused — for example, returned to the washing line — depending on the application.
What maintenance does the DAF system need?
The air-dissolving tank uses advanced anti-clogging technology, and even if a microbubble generator becomes blocked it can be serviced without shutting down the system. Routine tasks include checking the skimmer chain and scraping plates, monitoring PAC/PAM dosing, and removing accumulated sludge from the separation zone.
What applications is the DAF system suited for?
Beyond plastic recycling wash water, the robust design serves municipal, industrial, and commercial wastewater treatment. Its compact structure, optimized layout, and stable performance make it a valuable asset wherever efficient solid-liquid separation is needed.