Investigation of a high-pressure foam wasterwater treatment process

Many water and effluent treatment processes involve the separation of solids from a liquid phase, whether the solids are present naturally or result from the treatment process itself. Dissolved Air Flotation, DAF, is a particularly effective means of attaining solid/liquid separation,and its field of application is extensive. In a DAF process, air and water are mixed together at a high pressure, causing the air to dissolve in the water. The resultant dispersion water, ideally bubblefree, is released into a flotation vessel, where it mixes with the wastewater to be treated. The sudden reduction of pressure effected by the release device, generates a mass of minute air bubbles as the air comes out of solution. Attachment of the bubbles to the solid material present in the wastewater accomplishes its removal by lifting it to the surface, from where it may then be removed.

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R.M. Alkhaddar

Papers

Optimisation Of The Operating Parameters InAn Experimental DAF Process For WastewaterTreatment