The Dissolved Air Flotation (DAF) system is an advanced and highly efficient process widely utilized in sludge dewatering and wastewater treatment. It leverages the principles of air solubility and flotation to effectively separate suspended solids, oils, and greases from wastewater, ensuring enhanced water clarity and quality.

In this process, air is dissolved into water under high pressure, creating a supersaturated air-water mixture. This pressurized liquid is then introduced into the flotation tank, where the pressure is rapidly reduced to atmospheric levels. This sudden drop in pressure causes the dissolved air to come out of solution and form microscopic air bubbles. These tiny bubbles are a key feature of the DAF system, as they adhere to the surfaces of suspended particles within the wastewater.

The attachment of air bubbles significantly increases the buoyancy of these particles, enabling them to overcome gravitational forces and rise to the surface of the flotation tank. This upward movement results in the formation of a concentrated sludge layer on the surface. The floating sludge layer is carefully skimmed off using mechanical devices, ensuring the separation process is efficient and thorough.

The dewatered sludge collected from the skimming process can then be subjected to further treatment, such as stabilization or drying, depending on the requirements for disposal or potential resource recovery. Meanwhile, the clarified water—now free from most of its suspended impurities—exits the flotation tank and may undergo additional treatment stages to meet regulatory standards for reuse or discharge into the environment.

  • ADVANTGES :
  • High Efficiency in Solid Removal: The DAF system is highly effective in removing fine suspended solids, oils, and greases, achieving superior water clarity compared to many alternative methods.
  • Compact Design: DAF systems have a relatively small footprint, making them ideal for facilities with space constraints while still delivering high performance.
  • Versatility: They can handle a wide range of wastewater types and are adaptable to various industrial and municipal applications, including food processing, pulp and paper, and chemical industries.
  • Energy Efficiency: The process operates with relatively low energy consumption, making it a cost-effective choice for long-term operations.
  • Rapid Separation Process: The flotation process allows for quick removal of contaminants, contributing to faster wastewater treatment cycles and higher throughput.
  • Enhances Downstream Processes: By removing a significant load of solids and impurities, the DAF system improves the efficiency and longevity of subsequent treatment steps, such as filtration or biological treatment.
  • MODELS :
  • Model
  • CS – 0.5
  • CS -1
  • CS – 2
  • CS – 3
  • CS – 5
  • CS- 10
  • CS – 15
  • CS – 20
  • Flow (m3/h)
  • 0.5
  • 1
  • 2
  • 3
  • 5
  • 10
  • 15
  • 20
  • Volume (m3/h)
  • 0.3 – 0.5
  • 0.5 – 0.8
  • 1 – 1.5
  • 1.5 – 2
  • 3 – 4
  • 4 – 5
  • 5 – 7
  • 8 – 12
  • Recirculation (kw)
  • 0.55
  • 0.55
  • 0.55
  • 0.55
  • 0.75
  • 0.75
  • 0.75
  • 0.75
  • Skimmer (kw)
  • 0.15
  • 0.15
  • 0.37
  • 0.37
  • 0.37
  • 0.37
  • 0.37
  • 0.37
  • Total Power (kw)
  • 1.28
  • 1.28
  • 2.02
  • 2.02
  • 2.62
  • 3.32
  • 3.32
  • 4.12/6.62