IDL_CALCINAIA Wastewater Treatment Plant, Oltrarno, Toscana, Italy

IDL_CALCINAIA is an advanced wastewater treatment plant located in Oltrarno, a locality in Calcinaia, Pisa province, Toscana, Italy. The plant serves a population of approximately 3,604 and has a designed capacity of 3,000 cubic meters per day, with a current discharge volume of 713.46 m³/day. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. As an Italian facility, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment for agglomerations discharging into sensitive areas. The plant's scale falls within the small-to-medium category, for which secondary treatment is standard, but advanced treatment indicates a sensitive receiving environment. The treated effluent is discharged into the local water system, which ultimately drains into the Arno River and then into the Ligurian Sea. The Arno River basin is ecologically significant, supporting diverse aquatic life and providing water for agriculture and industry. The advanced treatment helps protect downstream water quality and the coastal marine environment.

The plant discharges into the Arno River basin, which flows through Toscana and empties into the Ligurian Sea near Pisa. The Arno River supports a variety of fish species and is an important water resource for the region. The advanced treatment level helps reduce nutrient loading, protecting the river and coastal waters from eutrophication and maintaining ecological balance.