Water treatment tanks represent a double challenge for waterproofing systems.

This type of structure must in fact guarantee double impermeability: to the external water table and, obviously, to the water treated inside the tank.

The Rozzano Purification Plant is also located on a narrow strip of land between the southern course of the Lambro river on one side and a canal on the other, in the south-east area of ​​the Smeraldino Oasis.

So the theme of the watertightness of the work is, if possible, even more sensitive due to the environmental implications.

Made by the Intesa Costruzioni company in collaboration with Drytech, the new purification tank was built in just 120 days with the Drytech Tank system.

The waterproof concrete was formulated by Drytech Engineering based on the characteristics of the system chosen by the construction company, with the aim of ensuring, in addition to watertightness, chemical resistance to urban waste.

Similar resistance is obviously required for DRYflex resin, which, being expanding, waterproofs joints, cracks and crossings by pressure.

The resin is injected along the entire thickness of the structure, so it opposes the water with a corresponding barrier.

Furthermore, the compatibility of DRYflex with drinking water – certified by compliance with BS 6920-1: 2000 – allows for guaranteed use in structures in contact with drinking water.

The new tank of the Rozzano Purification Plant, which came into operation in February 2019, has a capacity of 1,700 m³ and treats a maximum flow rate of 360 m³ / h.

Ownership: CAP Holding SpA, Assago

Progetto: Ing. Marco Callerio di CAP Holding, Assago

Struttura: Ing. Bernardo Vanelli, Castelleone

Costruzione: Intesa Costruzioni, Treviolo

Drytech Tank: 1,100 m²