Unzmarkt Wastewater Treatment Plant, Unzmarkt-Frauenburg, Styria, Austria

The Unzmarkt wastewater treatment plant is located in Unzmarkt-Frauenburg, a municipality in the Murtal district of Styria, Austria. It serves a population equivalent of 1,065, classifying it as a small agglomeration under Austrian and EU regulations. The plant is situated near the Murtal Schnellstraße and operates within the Mur River basin. The facility employs advanced treatment processes, which go beyond the EU Urban Waste Water Treatment Directive's minimum requirement of secondary treatment for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The plant's designed capacity is 2,100 m³/day, with a current discharge volume of 320.10 m³/day, indicating ample reserve capacity for future growth. The treated effluent is discharged into the Mur River catchment, which flows through Styria and eventually joins the Drava River in Croatia, then the Danube, and finally the Black Sea. The plant's advanced treatment helps protect the ecological health of the Mur River, which supports diverse aquatic life and is used for recreation and agriculture downstream.

The Unzmarkt plant discharges into the Mur River basin, part of the Danube River system that ultimately drains into the Black Sea. The Mur River is an ecologically sensitive watercourse supporting fish species such as grayling and brown trout. Advanced treatment at this plant reduces nutrient loads, helping to prevent eutrophication in downstream water bodies and maintaining water quality for downstream communities and ecosystems.