Dissolved Air Flotation (DAF) Systems

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High-efficiency eddy air floatation separator belongs to a kind of dissolved air flotation (DAF) equipment. It can provide an efficient wastewater treatment process that clarifies wastewater by removal of suspended solids, oils, greases, BOD, COD, and metals. This is achieved by dissolving air in the wastewater under pressure and then releasing the air at atmospheric pressure in a flotation tank. The released air forms tiny bubbles which adhere to the suspended matter causing it to float to the surface of the water where it can then be removed by a skimming device, ready to dewater for proper disposal.To improve solids removal coagulant/flocculants are added to coax suspended solids and colloidal particles into clumping together.


Dissolved air flotation process for water clarification occurs in a float tank dosed with a coagulant – such as aluminum sulfate or ferric chlorides. The coagulant enables the particles to form larger clusters for safe and effective removal. Water leaving the DAF tank is pumped into a pressure vessel (air drum) where the compressed air is present, resulting in saturation of the pressurized water with air. The saturation results in the formation of tiny bubbles that trap oils, solids, and greases. The bubbles form on the surface of the suspended matter particles, which then float to the surface, creating froth layers that are removed by skimmers.  

Applications for Industrial High-efficiency eddy air floatation separator

Dissolved air flotation is a process utilized across a myriad of industries. Wastewater generated from industrial processing plants contain contaminants such as; sand, lint, oils & greases, heavy metals, and volatile organic compounds (VOC’s). DAF technology is a proven and effective process for treating a variety of industrial wastewater streams specifically targeting oils, greases, and suspended solids, and producing quality water safe for discharge to sewer or reuse back into plant process.

Dissolved air flotation air separator is instrumental in effective water treatment. This equipment and process is also widely used in several industries and sectors, including but not limited to:  

  • Removing particles and treating industrial wastewater effluents at oil refineries.

  • Water treatment processing for petrochemical and chemical plants.

  • Water filtration for fuel gas conditioning plants and paper mills.                                                                                  

  • Oily wastewater in food processing industry.

  • Industrial facilities requiring wastewater treatment for daily protocols or project-related processes.

  • Municipal sewage treatment project.

MSTNLAND Eddy Air Floatation Separator

As a new dissolved air flotation equipment, its various characteristics are better than traditional dissolved air flotation and eddy concave air flotation, such as high pollutant removal efficiency (more than 10 times of the traditional equipment), the generated scum dry and less, the space requirement is only about 20% of the traditional equipment. High-efficiency eddy air floatation separator directly completes the process of pressurized dissolved gas in the wastewater, and chemical agents are directly added into the dissolved gas water. The formed floc presents a mixture of solid, liquid and gas in the form of high pressure. When the pressure decreases, the dissolved gas in the floc slowly releases and grows, and the water in the floc is squeezed out. It can float up by itself in a few seconds without the help of external forces, thus achieving solid-liquid separation.                                                                                        

  • Small volume of the whole equipment, reduced footprint

  • High efficiency of compressed gas and chemical utilization.

  • Robust pumps in combination with saturation tanks provide industry leading reliability and low maintenance whitewater (dissolved air).

  • High load pollutant treatment capacity, which is 8~10 times than the traditional air flotation.

  • The most efficient separation of sludge from the effluent water. 

  • Full movable skid mounted design.

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