ROWP SC HARVIZ SA sector Siculeni Racu - Secondary Treatment Plant in Harghita, Romania

ROWP SC HARVIZ SA sector Siculeni Racu is a municipal wastewater treatment plant located in Siculeni, Harghita County, Romania. It serves a small population of 668 residents, reflecting its role in a rural or small-town setting. The plant is part of the local water management infrastructure managed by SC HARVIZ SA. 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 population served here is below 2,000 PE, the plant's secondary treatment level ensures effective removal of organic matter and suspended solids. The designed capacity is 1,200 cubic meters per day, with an average discharge volume of 356.76 cubic meters per day, indicating ample capacity for current loads. The treated effluent is discharged into local surface waters, which eventually drain into the Olt River basin and ultimately into the Danube River and the Black Sea. The plant's operation helps protect the water quality of these downstream ecosystems, supporting aquatic life and reducing nutrient pollution in the Danube Delta and Black Sea coastal zone.

The plant discharges into local streams that are part of the Olt River basin, a major tributary of the Danube River. The Danube flows into the Black Sea, a semi-enclosed sea with significant ecological importance, including diverse marine life and migratory bird habitats. The secondary treatment reduces organic and nutrient loads, helping to prevent eutrophication in downstream waters. The region's Carpathian Mountain terrain influences runoff patterns, making effective treatment crucial for maintaining water quality in this sensitive watershed.