Dissolved Air flotation is one of the most effective methods for the removal of tiny suspended particles with a specific gravity close to that of water. It’s used to remove SS, oil&grease and other substances, reduce COD and BOD, and lessen the burden of subsequent treatment in industrial wastewater treatment, such as white water pulp recovery and water reuse of paper industry, removal of various heavy metal ions, refinery wastewater, oil pollution separation, impurities in tannery wastewater, color and impurities of printing and dyeing wastewater, various biological treatment, biological mud film solid-liquid separation, sludge concentration, etc.

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The traditional DAF technology use air compressor, return water pump and dissolved air tank to generate micro bubbles to remove SS, oil grease and other substances. SEPARATE developed to use Multi-phase flow pump to generate micro & nano bubbles without air compressor. The bubble liquid generated by the multiphase flow pump enters the air flotation reaction tank, and the microbubbles are adhered to the suspended solids particles as the carrier. By using the density difference between the air and the liquid, the pollutants float to the water surface to form scum. The scum is scraped by the scum scraping mechanism to remove oil and suspended solids and realize solid-liquid separation.

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Compared with traditional DAF, SEPARATE Multi-phase flow DAF has the following advantages:

  • The air flotation equipment using Germany original imported multiphase flow pump, in the process it can achieve a very perfect effect, when the liquid and air is sucked from the inlet of the pump, air in a highly dispersed state achieves a complete mix with liquid, the solubility of the liquid dissolved air can reach 100% saturation state, the air exists in the microbubble dispersion state in the liquid, the average diameter of the bubble ≤ 26 microns; 

  • Liquids with air content of up to 30% can be transported stably;

  • Eliminating the need for compressor, pressure vessel, releaser, control system and valve, centrifugal pump) compared to conventional air flotation systems, which are greatly simplified and more reliable. 

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It's commonly used to remove oil & grease and suspended solids to meet various treatment goals including:

  • Pretreatment to meet sewer discharge limits

  • Pretreatment to reduce loading on downstream biological treatment process

  • Polishing of biological treatment effluent

  • Thickening of biosolids

  • Product recovery and reuse