After proper pretreatment (such as primary sedimentation), the wastewater enters the aeration tank and is mixed with the activated sludge in the tank to form a mixed solution, and is fully aerated in the tank. The organic matter in the wastewater is adsorbed, absorbed and oxidized by the activated sludge in the aeration tank. , the mixed liquid enters the secondary sedimentation tank for solid-liquid separation, and the purified wastewater is discharged.
Three elements of activated sludge process
1. Microorganisms that cause adsorption and oxidative decomposition;
2. The organic matter in the wastewater is the object of treatment and the food for microorganisms;
3. Dissolved oxygen, without sufficient dissolved oxygen, aerobic microorganisms can neither survive nor perform oxidative decomposition.
The role of aeration
1. Aerobic metabolism of aerobic microorganisms;
2. Aerobic synthesis of facultative microbial enzymes;
3. The stirring effect of the mixture.
Aeration method
1. Blast aeration system;
2. Mechanical aeration device;
3. Blast + mechanical aeration system;
4. Other oxygen-enriched aeration, pure oxygen aeration, etc.