Freilingen GKA Wastewater Treatment Plant, Zürbach, Rhineland-Palatinate

Freilingen GKA is an advanced wastewater treatment plant located in Zürbach, in the Westerwaldkreis district of Rhineland-Palatinate, Germany. The plant serves a population of approximately 2,248 people and has a designed capacity of 2,600 cubic meters per day, with an average discharge volume of 798.26 cubic meters per day. As an advanced treatment facility, Freilingen GKA goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, which is typical for plants in sensitive catchment areas under the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size (2,000-10,000 population equivalent), the directive requires secondary treatment, and advanced treatment is mandated when discharging into sensitive areas. The plant's treated effluent is discharged into local watercourses that ultimately drain into the Rhine River basin, a major European watershed. The Westerwald region is characterized by low mountain ranges and forests, and the plant plays a key role in protecting downstream aquatic ecosystems from nutrient pollution.

Freilingen GKA discharges into small streams in the Westerwald region, which flow into the Rhine River via the Lahn or Sieg river systems. The Rhine basin supports diverse aquatic life and is an important migratory corridor for fish. The plant's advanced treatment helps reduce nutrient loads that could otherwise contribute to eutrophication in downstream water bodies, including the North Sea.