IDL_PIAN_DELLE_TORRI Wastewater Treatment Plant, Chiusi, Tuscany

IDL_PIAN_DELLE_TORRI is a wastewater treatment plant located in Chiusi, in the Tuscany region of Italy. The plant serves a population equivalent of 6,406, placing it in the small-to-medium agglomeration category under Italian and EU regulations. It is situated in the Valdichiana Senese area, a historically agricultural region known for its rolling hills and proximity to Lake Trasimeno. As a plant serving fewer than 10,000 people, it falls under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires appropriate treatment based on the sensitivity of the receiving waters. Italian plants of this scale typically employ secondary biological treatment to meet national and EU standards. The plant's capacity and operational status are consistent with standard municipal infrastructure for a town of Chiusi's size. The treated effluent from IDL_PIAN_DELLE_TORRI is discharged into the local drainage network, which ultimately flows into the Tiber River basin. The Tiber River is the third-longest river in Italy and drains into the Tyrrhenian Sea near Rome. The plant plays a key role in protecting the water quality of the Tiber watershed, which supports diverse aquatic life and is used for irrigation and recreation downstream.

The plant discharges into the Tiber River basin, which flows through central Italy before reaching the Tyrrhenian Sea. The Tiber watershed is ecologically significant, supporting fish species such as the Tiber barbel and providing habitat for migratory birds. Downstream waters are used for agriculture and drinking water supply, making nutrient removal important to prevent eutrophication in the coastal zone.