The purpose of primary clarification is to continuously remove nearly all settleable solids from the wastewater. Primary clarification is a cost effective removal method for solids in wastewater held in suspension by flow velocity. Particles in raw wastewater will form heavier particles that will settle by gravity under quiescent conditions. In addition, any grease and scum will float to the surface of the clarifier. Settled and floatable solids are conveyed to thickening for further treatment. Primary clarified effluent is conveyed to the aeration basins for further treatment.
