ROWP Primaria Zatreni Wastewater Treatment Plant, Stanomiru, Vâlcea

ROWP Primaria Zatreni is a municipal wastewater treatment plant located in Stanomiru, a village in Zătreni commune, Vâlcea County, Romania. The plant serves a small population of 294 residents, reflecting its role in a rural community. It is situated inland, far from coastal areas, and its operations are part of Romania's national wastewater infrastructure under EU environmental directives. The plant provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The designed capacity of 2,300 m³/day indicates the plant is sized to handle peak flows, though current discharge volume is 46.83 m³/day. Romania, as an EU member state, implements the directive through national legislation, ensuring that small treatment plants like this one meet effluent quality standards for organic matter and suspended solids. The treated effluent is discharged into a local watercourse, likely a tributary of the Olt River, which flows southward into the Danube River and eventually the Black Sea. The plant's operation helps protect local streams and the broader Danube basin from untreated sewage, supporting aquatic life and water quality in this rural region of southern Romania.

The plant discharges into a local stream that is part of the Olt River basin, a major tributary of the Danube. The Olt River flows through the Carpathian Mountains and the Romanian Plain, supporting diverse aquatic ecosystems. Downstream, the Danube Delta is a ecologically sensitive area that depends on good water quality from upstream tributaries. The plant's secondary treatment reduces organic pollution, protecting the local watershed and the Black Sea coastal environment.