Waste Water System

  • WHP2-Block-T Commercial, Saih Shuaib 3, Dubai.
  • +971 54 247 4633
  • contact@owato.ae

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Dissolved Air Floatation System

Dissolved air flotation is the most efficient technology for the removal of suspended solids (TSS), oils, grease, and biochemical oxygen demand (BOD) from wastewater and other industrial process streams.

Generally, the Compact DAF system includes:

  • DAF consisting of a rectangular tank, skimmer, sediment sludge extraction valve, air supply valves, pneumatic panel, and recirculation pump.
  • In-line flocculator - PFL for coagulation-flocculation with dosing points.
  • Coagulant dosing pump.
  • Caustic soda dosing pump.
  • Flocculant (polyelectrolyte) dosing pump.
  • Flocculant preparation unit (polyelectrolyte).
  • pH sensor and flow meter.
  • Feed pump, slurry pump, and levels.
  • Skid type platform.
  • State-of-the-art electrical control panel - Totally intuitive and user-friendly interface.

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 the suspended matter to float to the surface of the water where it may then be removed by a skimming device.

The feed water to the DAF float tank is often (but not always) dosed with a coagulant (such as ferric chloride or aluminum sulfate) to coagulate the colloidal particles and/or a flocculant to conglomerate the particles into bigger clusters.

A portion of the clarified effluent water leaving the DAF tank is pumped into a small pressure vessel (called the air drum) into which compressed air is also introduced. This results in saturating the pressurized effluent water with air. The air-saturated water stream is recycled to the front of the float tank and flows through a pressure reduction valve just as it enters the front of the float tank, which results in the air being released in the form of tiny bubbles. Bubbles form at nucleation sites on the surface of the suspended particles, adhering to the particles. As more bubbles form, the lift from the bubbles eventually overcomes the force of gravity. This causes the suspended matter to float to the surface where it forms a froth layer which is then removed by a skimmer. The froth-free water exits the float tank as the clarified effluent from the DAF unit.