ROWP SC APA CANAL SA sector Cristian - Secondary Wastewater Treatment Plant in Poplaca, Sibiu, Romania

ROWP SC APA CANAL SA sector Cristian is a municipal wastewater treatment plant located in Poplaca, Sibiu County, Romania. The facility serves a population of approximately 3,480 residents, classifying it as a small agglomeration under Romanian and EU regulations. The plant is situated inland, away from coastal areas, and its operations are part of the regional water management infrastructure managed by SC Apa Canal SA. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. The designed capacity is 4,100 m³/day, with an average discharge volume of 328.77 m³/day, indicating operational capacity well below design limits. As a secondary treatment facility, it employs biological processes to reduce organic matter and suspended solids before discharge. The treated effluent is discharged into a local watercourse that ultimately drains into the Olt River basin, a major tributary of the Danube River. The Danube then flows into the Black Sea. The plant plays a key role in protecting the local watershed from untreated sewage, supporting water quality in the downstream aquatic ecosystems.

The plant discharges into a tributary of the Olt River, which flows into the Danube and eventually reaches the Black Sea. The Olt River basin supports diverse aquatic life and is an important ecological corridor in the Carpathian region. Secondary treatment helps reduce nutrient loads, mitigating eutrophication risks in downstream water bodies. The surrounding area is characterized by hilly terrain and mixed land use, including agriculture and small settlements.