Dissolved Air Flotation is a water and wastewater treatment process that clarifies wastewater through the removal of suspended matter such as oil, greases or solids. Removal is achieved by injecting pressurized air into the wastewater where micro-bubbles then interact with the suspended solid particles. This interaction causes these particles to float to the surface of the DAF where they are then skimmed and separated.

In industrial processing plants, a DAF is often used to reduce loadings and clarify wastewater. Tiny air bubbles are released into the tank causing small particulates to float to the top where they are skimmed off. To remove larger suspended solids, coagulant is dosed into the feed water—this helps to speed up clumping and settling.

Dissolved air flotation machine works though the rotation of impeller. Pulps in the cell are absorbed between impeller blades though the bottom of cell by the moving impeller. At the same time, the low voltage air given by blower enters into the air distributor in the impeller cavity though air flue, air control valve, and the empty hollow, and then enter into the impeller blades though holes around the distributor. Then air and pulps are mixed between the impeller blades. After that, the mixed materials are discharged though the edge of the upper impeller. The discharged pulp flow moves to the top of the impeller and then spread in the whole cell. Mineral laden bubbles rise to the surface of cell and form to bubbles. Bubbles flows to the bubble tank. And some pulps return to the impeller area or recycling. Other pulps flow to the below cell for sorting though holes on the wall of cell.

The new dissolved air flotation machine has made some improvement on its structure: the blades of impeller tilts back, so that the impeller can have stronger string ability but consumes less energy; perforated cylindrical air distributor is installed in impeller cavity, so that air in the impeller cavity can distribute evenly; using u-shaped cell decreases the deposition of tailings.

There are numerous applications for the DAF:

• Meat and poultry industry
• Dairies
• Beverage sector
• Fruit and vegetable processing
• Potato and potato chips
• Vegetable oil processing
• General Food industry
• Manufacturing, metal processing
• Industrial laundries
• Paper, cardboard and printing
• Waste Activated Sludge thickening
• Potable water treatment
• Algae Removal

• Dissolved air pump edge bibulous the edge is inspiratory, pump pressurized mix within, gas to liquid efficient dissolving, small bubbles than 30 um.
• Low voltage operation, the dissolved gas efficiency is as high as 99%, release rate as high as 99%.
• Tiny bubbles and suspended particles of efficient adsorption, improve the SS remove effect.
• Dissolved gas water dissolving efficiency 80-100%, than traditional dissolved gas floating high efficiency three times.
• Pressure-capacity curve smooth, easy to achieve automatic control, easy to operate, easy maintenance, low noise.

Qingdao Yimei Environment Project Ltd. is found in 1988.We are located in the largest port city-Qingdao China. Our factary take up 36,000 square metres and there are more than 130 kinds machine for manufacturing. As a member of Shandong Province Environmental Protection Industrial Association, we have 360 staff and  72 experienced engineers.

Our main product is the equipment for Environment Protection and Waste Water Treatment.And the product is popular all over the world,such as Africa, North America,Domestic Market,Eastern Asia,Mid East.