Sozopol Wastewater Treatment Plant – Sozopol Urban Area
In 2015, the Municipality of Sozopol implemented a project titled “Integrated Water Cycle Project for the City of Sozopol – Phase I,” of which the Wastewater Treatment Plant is a part. The project is being implemented with financial support from the “Environment 2007–2013” Operational Program. The total project budget is 75,087,587 BGN, of which 58,239,184 BGN is grant funding. The treatment plant has been transferred to “Water Supply and Sewerage” EAD, Burgas, for management, maintenance, and operation.
The Sozopol WWTP serves the towns of Sozopol and Chernomorets and the village of Ravadinovo, and has a design capacity of 64,560 PE. The plant’s authorized hydraulic capacity is 10,172 m³/d during the summer season and 2,349 m³/d during the winter season, or an annual water volume of 1,796,130 m³/y.
The main facilities at the Sozopol WWTP are:
• primary (mechanical) treatment—fine screens (5 mm openings), an aerated sand and grease trap, and primary horizontal clarifiers;
• biological treatment – mixing and distribution chamber, biological reactor with integrated denitrification, internal recirculation, and simultaneous chemical phosphorus removal;
• secondary clarifiers and sludge level sensors;
• UV disinfection;
• aerobic stabilizer;
• sludge thickeners;
• mechanical sludge dewatering—performed using two centrifuges;
• auxiliary facilities—reagent storage, air blowing station, pumping station for recirculating and excess sludge, and inlet and outlet pumping stations.
The treated wastewater is discharged into deep waters of the Black Sea.