Flotation

Another method of oil recovery from oily sludge is the flotation method. The process principle of flotation is similar to that of the air flotation pool in sewage treatment. In the air flotation device, the oily sludge, water, and surfactant are first mixed in proportion, and a liquid slurry is created by the demulsification of the surfactant. Then, air is injected to generate bubbles in the slurry. When the bubbles move to the surface of the slurry due to buoyancy, they will collide with the oil droplets, thus continuously thinning the water-phase film between the oil-phase film and bubble film until it finally breaks. The oil-phase droplets will then rapidly spread and attach to the surface of the bubble film. Because the density of the oil phase is less than that of the water phase, the bubbles attached to the oil-phase droplets will quickly float to the surface of the mixed slurry. After a period of time, the oil droplets floating on the surface of the slurry can be scraped off, collected, and further purified, ultimately achieving the pur- pose of crude oil recovery

Dissolved Air Flotation

Application areas

Oil-water separation in the petrochemical industry and various oily wastewater;

Pretreatment of wastewater from textile, printing and dyeing, bleaching and dyeing, wool spinning, etc;

Wastewater treatment in the surface treatment industry (electroplating, PCB, pickling, etc.);

Pretreatment of wastewater in the pharmaceutical, chemical, paper, leather, slaughter, food and beverage industries;

It is widely used in the pretreatment of industrial wastewater and can replace the sedimentation tank.

Significant advantages

Adopt high-efficiency dissolved gas system, with dissolved gas efficiency above 95%;

Use liquid level control to automatically discharge slag, and the moisture content of scum is below 98%;

Special high-efficiency non-blocking releaser is adopted, which is easy to maintain, and the outgassing rate is over 95%;

The processing effect is stable, fully automatic control, and unattended operation can be realized;

It occupies less land, is better to pay less, and save investment;