Polling und Umgebung Wastewater Treatment Plant, Polling im Innkreis, Austria

Polling und Umgebung is an advanced wastewater treatment plant located in Polling im Innkreis, in the state of Oberösterreich, Austria. The plant serves a population of approximately 4,119 people, making it a small-scale municipal facility. It is situated in the Innviertel region, near the border with Germany. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients such as nitrogen and phosphorus. This level of treatment is typical for plants discharging into sensitive water bodies under the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant has a designed capacity of 6,067 m³/day and currently discharges an average of 878.36 m³/day, indicating ample reserve capacity. The treated effluent is discharged into the local watershed, which ultimately drains into the Inn River, a major tributary of the Danube. The Danube flows into the Black Sea, making this plant part of a large international river basin. Advanced treatment helps protect downstream aquatic ecosystems and supports water quality goals in the Danube River Basin.

The plant discharges into the Inn River watershed, which flows into the Danube River and eventually the Black Sea. The Danube is a vital ecological corridor supporting diverse aquatic life, including migratory fish species. Advanced treatment at this plant reduces nutrient loads, helping to prevent eutrophication in downstream waters and contributing to the environmental objectives of the Danube River Basin Management Plan.