ROWP Primaria Gura Raului - Secondary Wastewater Treatment Plant in Sibiu, Romania

ROWP Primaria Gura Raului is a municipal wastewater treatment plant located in Gura Râului, a commune in Sibiu County, Romania. The plant serves a population of 2,184 and operates with a designed capacity of 3,500 m³/day, currently treating 479.38 m³/day of wastewater. As a secondary treatment facility, it provides biological treatment to reduce organic matter and suspended solids before discharge. The plant's treatment process and capacity align with Romania's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations under 10,000 population equivalent (PE), the directive requires appropriate treatment, which secondary treatment fulfills. The plant's current discharge volume is well below its designed capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local watercourses that eventually drain into the Olt River basin, a major tributary of the Danube. The Danube then flows into the Black Sea. The plant plays a key role in protecting the local watershed from untreated sewage, supporting aquatic life and downstream water quality in the Olt River and Danube Delta ecosystem.

The plant discharges into the Olt River basin, which flows southward to join the Danube River near the Bulgarian border. The Danube then empties into the Black Sea via the Danube Delta, a ecologically sensitive area that supports diverse aquatic life and serves as an important migratory corridor for birds. The secondary treatment provided by the plant helps reduce nutrient and organic pollution, mitigating eutrophication risks in downstream water bodies.