Night soils correspond to the sludge extracted from private sewerages.
In the context of departmental waste management plans, certain local water-treatment plants must be equipped with sewage material receiving and treatment equipment.

NANTAISE DES EAUX INGÉNIERIE adapts its technologies to treat night soils:

• Service provider identification system
• Pre-treatments
• Prior check of the quality of the effluent
• Receiving pit
• Storage tank
• Destocking equipment