Principle: Aeration of air into the water at high pressure, then suddenly reducing the pressure to a lower pressure environment, the air escapes in the form of tiny bubbles.

Technologycal Progress:

Supply air into the water – Dissolve air into water – Create air bubbles from a solution that are too saturated with air – attach air bubbles – attach sediments to air bubbles – Remove sediments from water

Operation principle:

Water is fed into the dissolved gas tank by high pressure pump. Air is fed into the dissolved air tank by air compressor, where water and air are mixed. Water saturated air flows into the flotation chamber of the flotation tank, through a pressure reducing valve, the pressure drop to atmospheric pressure. Dissolved moat is separated and adhered to the sediment particles in the water, the flotation process is formed


  • Retention time in flotation tank: 20 – 60 minutes
  • A/S ( air/ Sludge): 0,02 – 0,45
  • Time to store water in dissolved air tanks: 0.5 – 3 minutes
  • Surface load: 2 – 350 m3 / m2 / day
  • Compressed air pressure: 3.5 – 7 atm
  • Air consumption: 15 -50 l / m3


  • Efficient removal of high concentration of suspended solids 90 – 95%
  • Reduce time and tank capacity compared to other constructions
  • Removes difficult organic deposits
  • Combined with the flotation process using chemicals brings high efficiency
  • The collected sludge has low humidity, can be reused


  • Wastewater from restaurants, hotels;
  • Wastewater from paper and pulp factories;
  • Wastewater from slaughtering, aquaculture;
  • Wastewater from plating slag, recover heavy metals;
  • Preliminary wastewater treatment with high concentrations such as chemical, pharmaceutical, etc.


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