CE 587 demonstrates the clarification of raw water containing solids using the dissolved air flotation process. First, a suspension (raw water) is prepared in a tank. From here the raw water flows into a flocculation tank divided into three chambers. By adding a coagulant to the first chamber, the repulsive forces between the solid particles are eliminated. The solid particles are combined into flocs. To create larger flocs, a flocculant is added to the second chamber. The coagulant causes a decrease in the pH value. By adding caustic soda the pH value of the water can be increased again. Reduced flow rates are present in the next third chamber of the flocculation tank to avoid any turbulence. The turbulence would prevent the formation of flocs.

Code: CE587