ARA Lengenfeld 3438 KR - Advanced Wastewater Treatment in Lengenfeld, Austria

ARA Lengenfeld 3438 KR is a wastewater treatment plant located in the Katastralgemeinde Lengenfeld, within the municipality of Lengenfeld in the Bezirk Krems, Niederösterreich, Austria. The plant serves a population of approximately 1,895 people and has a designed capacity of 4,000 m³/day, with a current discharge volume of about 601 m³/day. The plant employs advanced treatment processes, which go beyond the secondary treatment standards required by the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size (under 2,000 population equivalent), the directive typically mandates appropriate treatment, but Austria often implements higher standards to protect sensitive water bodies. The treated effluent is discharged into local watercourses that ultimately drain into the Danube River basin. The plant plays a key role in protecting the local aquatic environment and downstream ecosystems, including the Danube, which is a major European river supporting diverse wildlife and human activities.

The plant discharges into small streams within the Kamp River catchment, which flows into the Danube River near Krems. The Danube is a vital European waterway supporting rich biodiversity and providing drinking water for millions. The advanced treatment helps reduce nutrient loads, protecting the Danube's ecological health and preventing eutrophication in the Black Sea, where the Danube ultimately drains.