General Description>>
Dissolved air flotation system is an advanced equipment combined flotation and settling functions. High surface loading, short retention time and shallow water depth were uniqueness of this system compared to the conventional designs. (Refer to Pic. 1)
Theory>>
The air is pressurized to be dissolved in the Air Dissolving Tube, and the fine bubbles will be released when it is discharged into the open basin.
The diameter of fine bubble is 1μm approximately and the flotation velocity is about
15cm/min. The floc in the solution will be attached by fine bubbles and floated to the top of water. The flotation process will be completed within 3 minutes and consistency of buoyant sludge is 2-3% solid content.(Refer to Dwg.1& 2)
Structure>>
1. Flotation cellCircular tank made of stainless steel, capable to load the weight with full water.
2. Central rotation bearing
The central rotation bearing is special designed with precision fabrication. It is capable to support the half of rotation part and ensure the normal operation under any condition.
The center column is the inlet channel of influent.
3. Influent distributor
Distribute the influent into the cell evenly and steady for flotation separation.
Adjustable plates and air vent were furnished to adjust the influent distribution evenly in cell and release the excess air. The neoprene scraper were furnished on bottom of distributor to collect the settled sludge to sludge pit for removal.
4. Distribution rack
The rack is fixed on rotation walkway, made of steel angles. The rack is designed to eliminate the turbulent flow of influent.
5. Clear water discharge pipe
Consisted of 3 (Minimum) square pipes, located near bottom of rotation cell for clear water steady discharge.
6. Clear water outlet tank
The tank is made of steel plate and neoprene seals to ensure no contamination of influent.
7. Discharge weir
The weir is made of steel plate, the consistency of floating sludge can be controlled by adjustment of weir height.
Apperance & Dimension>>
(Refer to Dwg.3&4、Table.1&2)
Dissolved Air Flotation System (DAF)
