Dissolved Air Flotation Design Calculations Pdf

Function and objectives the dissolved air flotation daf is a kind of induced flotation applying the capacity of certain solid or liquid particles to join with air bubbles forming particle gas clusters less dense than liquid phase.

Dissolved air flotation design calculations pdf.

Dissolved air flotation theory of operation. I have input parameters and with input parameters i calculated a s ratio air solubility solid loading ratio hydraulic loading ratio etc the next step when i know calculations and what is required daf plate area i need to find what will be length height and width for my daf plate pack. Solubility of air in water. Scribd is the world s largest social reading and publishing site.

The floc accumulated on the surface known as the float is skimmed off as sludge section 7 19 the clarified water is removed from the bottom and is sometimes called the subnatant or floated water. Dissolved air flotation is a method for separating and removing sus pended solids from liquid based on changes in the solubility of gas as pressure varies. One of the well known intermediate stages to treat water and wastewater is dissolved air flotation daf. If you are unfamiliar with basic daf separator design principles a review of the dissolved air flotation theory of operation might prove helpful this basic document covers stokes law and other basic separation concepts.

Dissolved air flotation operates on the principal of the transfer of floc to the surface of water through attachment of air bubbles to the floc. Phd thesis university of newcastle upon tyne 1998. In order to design an efficient daf unit it is important to study the system and get familiar with the flow structure in it. Upon entering the daf unit the air pressure is re.

Air is dissolved under pressure in a clean liquid usually recycled effluent from the daf unit and injected into the raw feed stream. Daf sizing xls free download as excel spreadsheet xls pdf file pdf text file txt or read online for free. Computational fluid dynamics cfd is used as a tool to study a flotation unit. Calculations use a water temperature of 20 c.

From adlan m n a study of dissolved air flotation tank design variables and separation zone performance. Recycle flow dissolved air flotation 2. Partial flow dissolved air flotation without recycle figure 3. The three main types of dissolved air flotation are vacuum flotation micro flotation and pressure flotation.

I work on design daf dissolved air flotation product. At this temperature ρ. These are as follows. Full flow pressure flotation where the entire influent stream is pressurized and.