The Main Equipment of a Dissolved Air Flotation Plant

The specific features of dissolved air flotation make this clarification technology almost always used in combination with chemical treatment. The few exceptions are mainly biological sludge thickening and some applications in food processing such as the removal of particulate grease (non-emulsified). The reason for this is mainly that this technology can clarify very quickly and very well if it is used under the best conditions. Well, a chemical treatment by flocculation or by coagulation + flocculation ensures the most favourable conditions from several points of view. It is also true that chemical treatment is beneficial and even indispensable in a large number of cases of clarification by sedimentation, as it improves the efficiency of separating polluting materials. In sedimentation, it certainly makes it possible to significantly increase the sedimentation velocity, but in flotation its importance can be even more significant, because it favours not only the trapping and agglomeration of micro-flocs and the quality of liquid/solid separation, but also the quality of the adhesion of micro air bubbles to the flocs.