Pre-Treatment, Primary, Secondary and Tertiary Treatment
Pre-Treatment: Grit removal, flow equalization.

Primary Treatment: Septic tank, grease trap.
Septic tanks are used to settle sludge while grease and oils rise to the surface. A partial anaerobic decomposition
of organic matter will also take place.

Secondary Treatment: Constructed wetlands.
The main function of this stage is the decomposition of organic matter present in sewage.

Tertiary Treatment: Constructed wetlands
During this stage the effluent is polished. Nutrients (N and P) are removed and the wastewater is more or less
disinfected.


Constructed Wetlands