Primary

sedimentation

Primary sedimentation is achieved through settlement and flotation in the primary chamber.

Biological treatment

Biological treatment is achieved through anaerobic treatment followed by aerobic stabilisation with media for biological growth contained in the chamber.

Secondary

sediment

This chamber is designed to minimise turbulence to allow settlement of suspended solids (SS), and automatic return of settled materials to the primary chamber. At this point the wastewater is clarified.

Disinfection

(optional)

Disinfection is used to reduce the bacteria levels of clarified effluent. The most common method is chlorination, followed by ultraviolet (UV) radiation and occasionally ozonation.