UWWTP_IDRIJA Wastewater Treatment Plant, Idrija, Slovenia

UWWTP_IDRIJA is a municipal wastewater treatment plant located in Idrija, Slovenia, serving a population of 1,622. The plant is situated in the Bašerija area and provides secondary treatment for the local community. As a small agglomeration, it plays a key role in protecting the region's water resources. The plant operates under Slovenia's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. With a designed capacity of 4,000 m³/day and an actual discharge volume of 253.35 m³/day, the facility has ample capacity for current loads. The treatment process ensures compliance with national standards for organic matter and suspended solids removal. The treated effluent is discharged into the local watershed, which ultimately drains into the Soča River basin and then into the Adriatic Sea. The Soča River is known for its pristine waters and supports diverse aquatic life, including endemic fish species. The plant's operation helps maintain water quality in this ecologically sensitive karst region.

The plant discharges into the Idrijca River, a tributary of the Soča River, which flows into the Gulf of Trieste in the Adriatic Sea. The Soča River basin is characterized by karst geology and supports a unique ecosystem, including the marble trout and other sensitive species. Secondary treatment reduces organic pollutants and protects downstream water quality in this ecologically important watershed.