DP01402601_DELEBIO Wastewater Treatment Plant, Delebio, Lombardia, Italy

DP01402601_DELEBIO is an advanced wastewater treatment plant located in Delebio, a municipality in the province of Sondrio, Lombardia, Italy. The plant serves a population of approximately 3,833 residents and is situated in the Valtellina valley, an alpine region known for its mountainous terrain and proximity to the Adda River. The facility is designed to handle a capacity of 3,960 m³/day, with a current discharge volume of 758.80 m³/day, indicating operational headroom. As an advanced treatment plant, DP01402601_DELEBIO employs tertiary-level processes that go beyond secondary treatment to remove nutrients and other pollutants. This level of treatment is consistent with Italy's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment for discharges into sensitive areas. The plant's advanced status suggests it likely targets nitrogen and phosphorus removal to protect downstream water quality. The treated effluent from the plant is discharged into the local water system, which ultimately flows into the Adda River, a major tributary of the Po River. The Po River basin is the largest in Italy and drains into the Adriatic Sea. The advanced treatment helps safeguard the ecological health of the Adda and Po rivers, supporting aquatic life and downstream uses such as irrigation and recreation.

The plant's discharge enters the local hydrographic network, which feeds into the Adda River. The Adda flows through Lake Como before joining the Po River, which empties into the Adriatic Sea. This watershed supports diverse aquatic ecosystems, including fish species such as trout and grayling in the upper reaches. The advanced treatment reduces nutrient loading, mitigating eutrophication risks in Lake Como and the Adriatic coastal zone.