DAF dissolved air flotation machine is a water treatment process that clarifieswastewaters (or other waters) by the removal of suspended matter such as oil or solids. 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.

Dissolved air flotation is very widely used in treating the industrial wastewater effluents from oil refineries, petrochemicaland chemical plants, natural gas processing plants, paper mills, general water treatment and similar industrial facilities. 

Note: we can design the different size based on the different water capacity(m3/h).

Technical flow chart



Working principle

Based on different water source and different water quality, The feed water to the DAF float tank is often (but not always) dosed with Flocculant and coagulant (such as PAC and PAM) to coagulate the colloidal particles and 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 atnucleation 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.

Based on water quality, we can add sedimentation device at the bottom of the DAF machine, it can make the particles (such as sludge, sand) that easy to sedimentation setting into the bottom of tank .

Shandong Tianlang Environmental Protection Technology Co., Ltd. is a high-tech enterprise integrating environmental equipment production and R&D. The company is located in Zhucheng City, Shandong Province, with beautiful scenery.  It has convenient transportation because it nears Qingdao and Rizhao seaport.

Covering an area of 80,000 m2, the company has advanced production line and production technology. By absorbing the advanced manufacturing concepts and sewage treatment experience of the same industry at home and abroad, it has cooperated with many well-known sewage treatment experts and universities. It has Strong non-standard design and manufacturing capabilities, perfect production testing equipment, complete manufacturing specifications, stable and reliable product quality.

As a production and research enterprise for environmental protection equipment, the company mainly develops and produces sewage treatment equipment, sludge dewatering equipment, waste gas treatment equipment, manure fermentation equipment and waste incinerator. Products are widely used in agriculture, aquaculture, petroleum, chemical, paper, pharmaceutical, food, starch, metallurgy, slaughter, printing and dyeing and other fields. There are dissolved air flotation machine, integrated sewage treatment equipment, MBR bioreactor, mechanical filter, disinfection equipment; belt filter press, plate and frame filter press, screw dewatering machine and waste incinerator nearly 100 kinds of products and accessories. trusted by the majority of users, it become the backbone of China's environmental protection industry.

In the face of fierce competition in the market, our company adheres to the business philosophy of ""Focus on quality, keen on innovation", continuously strengthens the product research and development, so that the product has a broader market.                   

Looking forward to the future, we will continue to provide more high-quality products and prompt and sincere service to customers, and supply environmental protection solutions to you.

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