DP01406107_SONDRIO_SASSELLA Wastewater Treatment Plant, Sondrio, Italy

DP01406107_SONDRIO_SASSELLA is an advanced wastewater treatment facility located in the Sassella district of Sondrio, in the Lombardy region of northern Italy. The plant serves a small population of 60 people, reflecting its role in a rural or peri-urban setting within the Valtellina valley. It is situated along the SS38 road, near the Adda River, which flows through the valley. The plant employs advanced treatment processes, going beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 60 m³/day and an actual discharge volume of 11.88 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The advanced treatment likely includes nutrient removal or disinfection, ensuring high effluent quality. The treated wastewater is discharged into the local water system, ultimately reaching the Adda River, a major tributary of the Po River. The Po River flows into the Adriatic Sea, making this plant part of the Po basin. The advanced treatment helps protect the sensitive Alpine aquatic environment and downstream ecosystems, including the Po Delta, which supports diverse wildlife and migratory birds.

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, forming the Po Delta, a critical wetland for migratory birds and aquatic biodiversity. The advanced treatment ensures minimal nutrient and pollutant loading, protecting the sensitive Alpine and downstream ecosystems from eutrophication and contamination.