5. Lifting station

5.1 Principle

A lift station is sometimes required for :

• bring wastewater to the top of an infiltration mound;

• feed a drained vertical sand filter so that treated water can be discharged into an outfall (if there is a slight difference in level between the home's wastewater outlet and the outfall);

• supply other treatment systems according to the topography of the site, the dimensions of wastewater outlets and the excavation depths to be respected.

The lift station may or may not be prefabricated (in kit form), and must be fitted with a removable buffer. It comprises (figure