PATNA STW - Advanced Wastewater Treatment in Polnessan, Scotland

PATNA STW (Sewage Treatment Works) is located in Polnessan, East Ayrshire, Scotland, within the United Kingdom. The plant serves a small community of approximately 2,242 people and operates with advanced treatment technology, ensuring high-quality effluent before discharge. As an advanced treatment facility, PATNA STW goes beyond the secondary treatment standards required by the EU Urban Waste Water Treatment Directive (UWWTD) for agglomerations of this size. The plant has a designed capacity of 6,000 cubic meters per day, with a current discharge volume of 499.15 cubic meters per day, indicating ample reserve capacity. The treated wastewater is discharged into local watercourses that ultimately drain into the Firth of Clyde, a major sea inlet on Scotland's west coast. This coastal discharge location requires careful management to protect marine ecosystems, and the advanced treatment level helps minimize environmental impact.

The plant discharges into tributaries of the River Doon, which flows into the Firth of Clyde near Ayr. The Firth of Clyde supports diverse marine life, including commercial fisheries and important bird populations. The advanced treatment ensures that nutrient and pollutant loads are minimized, protecting downstream water quality in this ecologically sensitive coastal environment.