ROWP SC Compania de Apa SA Buzau sect Chiojdu Wastewater Treatment Plant, Chiojdu, Romania

ROWP SC Compania de Apa SA Buzau sect Chiojdu is a municipal wastewater treatment plant located in Chiojdu, a village in Buzău County, Romania. The plant serves a small population of 414 people and is situated in the Subcarpathian region, an area characterized by rolling hills and a temperate continental climate. 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 with a population equivalent (PE) between 2,000 and 10,000. Although the plant's population served is below this threshold, the facility's designed capacity of 800 m³/day suggests it is built to accommodate future growth or seasonal variations. The plant's discharge volume is reported as 29.16 m³/day, indicating a low hydraulic load relative to its capacity. The treated effluent is discharged into local watercourses that eventually drain into the Buzău River, a tributary of the Siret River, which flows into the Danube and ultimately the Black Sea. The plant plays a crucial role in protecting the local watershed from untreated sewage, supporting aquatic life and downstream water quality in the Buzău River basin.

The plant discharges into small streams that feed the Buzău River, part of the Danube basin. The Buzău River supports diverse freshwater ecosystems and is used for irrigation and recreation. Downstream, the Danube Delta is a major ecological region, home to numerous bird species and fish. The plant's secondary treatment helps reduce organic pollution and nutrient loads, mitigating eutrophication risks in the Black Sea.