Milan protects the long-term future of its agriculture thanks to the largest alternative water source in Europe
Irrigate fields while protecting the water resources
Milan, the capital of Italy’s Lombardy region, is considered to be the country’s economic heart. Criss-crossed by the Po river and its tributaries, the region nonetheless suffers from periods of harsh drought. The surface water tables are not sufficiently regenerated while the irrigation of agricultural crops consumes almost 70 % of local water resources.
To manage recurrent droughts and support its agricultural industry, the Milan authorities turned to SUEZ in October 2001. The main issue for the region was to implement a sustainable crop irrigation solution that would preserve water resources, namely
- produce water for agricultural needs in sufficient quantities and quality, even during dry periods;
- limit the environmental impact of the water production plant built in a protected agricultural area.
Recycling wastewater, an alternative resource for irrigation
- that treated water destined to irrigate crops for use in the food chain is harmless, due to ultraviolet disinfection techniques.
- respect of standards specific to sensitive natural areas, using complementary mechanical and biological processes which control the levels of nitrogen and phosphates.
For local inhabitants, going beyond environmental regulations
As the Milan San Rocco wastewater treatment plant is located in a protected agricultural area, it blends seamlessly into the environment:
- two towers treat the air as the water is treated, before discharging it back into the environment.
- The plant generates no olfactory, visual or noise pollution in its natural surroundings.
SUEZ offered Milan the largest alternative water resource in Europe. Its sustainable management of the water cycle reconciled economic issues with protection of the fragile natural environment; agriculture was given a boost and the balance of the surrounding ecosystem was re-established.
In dry periods, all recycled wastewater is used to irrigate 22,000 hectares of crop fields. In summer 2006, this saved up to 80% of maize and rice crops according to estimates by local farmers.
The technologies developed by SUEZ enable Milan's farmers to return to their vegetable growing traditions. Food crops that were sensitive to water quality (tomatoes, potatoes, certain rice varieties) had been stopped because of the organic pollution of the river water and the poor quality of wastewater treatment. They have all been resumed. Fish and frogs that had disappeared returned to the surrounding rivers, fresh water fishing was reopened.