Imhoff tank  realized in polypropylene, fully recyclable material, extruded sheets thermowelded with wire and carry properly reinforced to withstand the pressures due to landfill and ensure walkability. The tank is composed of two compartments suitably dimensioned: sedimenator with a minimum volume of 40l/eq. in. and digester with a minimum volume of 100l/eq.  in.., unless otherwise specified local authorities. The imhoff tank is equipped manholes for the inspection of the sedimentation compartment and for the removal of sludge, of an inlet hole wastewater with its gasket double lip rubber, of an outlet hole of the clarified water always with gasket, and a vent for biogas removal.