Diffused Air Aeration

In diffused air aeration method compressed air is blown through the sewage and air is diffused into sewage by the diffuser. Diffusers are of two types: Plate diffusers and Tube diffusers. Plate Diffuser: They are rectangular/square plates made of crystalline alumina or high silica sand. In this method, the compressed air is blown through a perforated plate diffuser. The air comes out through the holes of the diffuser plate and rises upward in the form of bubbles. Thus, the sewage absorbs oxygen from the air. Tube Diffuser: It consists of a perforated tube suspended in the wastewater near the bottom and can be taken out while cleaning. The compressed air is dented through the tube. The air comes out through the holes with great force and agitates the sewage.