DP01400502_ARDENNO_PIAZZALUNGA Wastewater Treatment Plant, Piazzalunga, Italy

DP01400502_ARDENNO_PIAZZALUNGA is a wastewater treatment plant located in Piazzalunga, a locality within the municipality of Ardenno in the Valtellina valley, Lombardy, Italy. The plant serves a small population of 110 people, reflecting its role in a rural alpine community. The plant provides advanced treatment, which goes beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Its designed capacity is 110 m³/day, and the actual discharge volume is 21.78 m³/day, indicating ample reserve capacity. The treated effluent is discharged into the local water system, which ultimately drains into the Adda River, a major tributary of the Po River. The Po River flows into the Adriatic Sea, making this plant part of the broader Po basin watershed. The advanced treatment helps protect the sensitive alpine and riverine ecosystems downstream.

The plant discharges into the Adda River, which flows through the Valtellina valley and joins the Po River near Cremona. The Po River then empties into the Adriatic Sea. The Adda River supports diverse aquatic life and is an important water resource for irrigation and drinking water in Lombardy. The advanced treatment level helps minimize nutrient and pollutant loads, protecting the river's ecological health and the downstream Po Delta ecosystem.