The activated sludge process is the most important biological process in water treatment. CE 705 allows this process to be demonstrated. A pump supplies raw water contaminated with dissolved organic substances (organic matter) into the aeration tank. Aerobic microorganisms (activated sludge) in the aeration tank use the organic matter as a source of nutrition, biodegrading it in the process. Since aerobic microorganisms need oxygen, the raw water is aerated in the aeration tank. The activated sludge is mixed with raw water using agitating machines. In the secondary clarifier, the activated sludge is separated from the treated water by sedimentation. A part of the activated sludge is returned to the aeration tank (return sludge). The treated water is collected in a tank.

Code: CE 705