Waste Water Treatment › Chemical Treatment of Wastewater
Coagulation & Flocculation System
Coagulation is the precipitation of substances that give turbidity and color to the water as large flocks with the help of coagulants. It should be ensured that the coagulant is homogeneously distributed in the water. The mixing can be provided mechanically or hydraulically, but mechanical ones are preferred. This is because the mixing speed is greater than the flow rate of the pool and there is the possibility of faster mixing.
As a coagulant;
- Aluminum salts: Al2(SO4)3 .14H2O, Al2(SO4)3 .18H2O
- Iron and iron salts: FeCl3, Fe2(SO4)3, FeSO4.7H2O
- Sodium aluminate: Na2AlO4
Flocculation is the combination of small flocks destabilized as a result of the coagulation process as a result of slow mixing and the formation of large flocs that precipitate rapidly. Mechanics, pneumatic and hydraulic type are made in 3 ways. The most common are mechanical mixers. Among the mechanical mixers, pedal and propeller mixers are also used.
Water is mixing slowly to allow colloidal substances to meet each other.