Delnice Wastewater Treatment Plant - Delnice, Croatia

The Delnice wastewater treatment plant is located in the town of Delnice, in the mountainous region of Primorsko-goranska County, Croatia. The plant serves the local population as part of the municipal wastewater infrastructure. The facility provides primary treatment, which involves physical processes such as sedimentation to remove settleable solids. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), primary treatment is generally considered a preliminary level, and agglomerations of this scale are typically required to achieve at least secondary treatment. The plant's designed capacity is 6,660 cubic meters per day. The treated effluent is discharged into a local watercourse that eventually drains into the Kupa River, a major tributary of the Sava River, which flows into the Danube and ultimately the Black Sea. The plant plays a role in protecting the water quality of the Kupa River basin, which supports diverse aquatic life and is used for recreation and water supply.

The plant discharges into a local stream that flows into the Kupa River, a significant water body in the region. The Kupa River is part of the Sava River basin, which drains into the Danube and the Black Sea. The watershed supports diverse aquatic ecosystems, including fish populations and riparian habitats. The plant's primary treatment level may not fully address nutrient loads, potentially impacting downstream water quality in this ecologically sensitive area.