ANTEY_SAINT_ANDRE Wastewater Treatment Plant, Châtillon, Italy

ANTEY_SAINT_ANDRE is a municipal wastewater treatment plant located in Châtillon, within the Valle d'Aosta region of northern Italy. The facility serves a population of approximately 3,800 residents and operates with a designed capacity of 13,200 m³/day, indicating it is sized to accommodate future growth or seasonal variations. The plant provides secondary treatment, which is the standard biological treatment stage required under Italian and EU regulations for communities of this scale. As a secondary treatment plant, ANTEY_SAINT_ANDRE uses biological processes to reduce organic matter and suspended solids before discharging treated water. The plant's discharge volume of 752.27 m³/day reflects current operational levels. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations with a population equivalent (PE) between 2,000 and 10,000 are generally required to have secondary treatment, which this plant meets. The treated effluent is discharged into the local watercourse, which flows through the Dora Baltea river basin and eventually reaches the Po River and the Adriatic Sea. The Valle d'Aosta region is characterized by alpine terrain and sensitive mountain ecosystems, making proper wastewater treatment essential for protecting downstream water quality and aquatic habitats.

The plant discharges into the Dora Baltea river system, a tributary of the Po River, which flows into the Adriatic Sea. The alpine watershed supports diverse aquatic life and is ecologically sensitive due to its mountainous terrain and seasonal flow variations. Proper treatment helps protect downstream ecosystems, including fish populations and riparian habitats, from nutrient enrichment and pollution.