Overview
UWWTP Sliven serves the city of Sliven, Bulgaria, with a population equivalent of 93,614. The plant operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.
UWWTP Sliven is a municipal wastewater treatment facility located in the Rechitsa district of Sliven, Bulgaria. Serving a population equivalent of 93,614, the plant is classified as a large agglomeration under EU regulations. The facility is situated inland, approximately 50 km from the Black Sea coast, and plays a key role in managing wastewater from the city and its surrounding areas. As a Bulgarian plant, UWWTP Sliven operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations with a population equivalent greater than 10,000. For larger agglomerations like Sliven, the directive also mandates tertiary treatment if the receiving water body is designated as a sensitive area. The plant's treatment processes are designed to meet these standards, ensuring compliance with national and EU water quality regulations. The treated effluent from UWWTP Sliven is discharged into the local water system, which ultimately drains into the Black Sea via the Tundzha River and the Maritsa River basin. The Black Sea is a semi-enclosed sea with limited water exchange, making it sensitive to nutrient pollution. The plant's operations help protect downstream aquatic ecosystems, including the Tundzha River's biodiversity and the coastal waters of the Black Sea.
Environmental context
UWWTP Sliven discharges into the Tundzha River, a tributary of the Maritsa River, which flows into the Aegean Sea. The Tundzha River supports diverse aquatic life and is an important migratory corridor for fish species. The plant's nutrient removal helps prevent eutrophication in the downstream water bodies, particularly the Black Sea, which is sensitive to nitrogen and phosphorus loading.
Frequently asked questions
UWWTP Sliven is located in the Rechitsa district of Sliven, Bulgaria.
UWWTP Sliven serves a population equivalent of 93,614, classifying it as a large agglomeration under EU regulations.
The treated effluent from UWWTP Sliven is discharged into the Tundzha River, which flows into the Maritsa River and ultimately reaches the Aegean Sea.
UWWTP Sliven operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations over 10,000 PE and tertiary treatment in sensitive areas.
For a plant serving 93,000 people in Bulgaria, typical treatment includes secondary biological treatment, and often tertiary treatment for nutrient removal, to comply with EU standards and protect sensitive receiving waters.
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