Obdach Wastewater Treatment Plant, Steiermark, Austria

The Obdach wastewater treatment plant is located in the town of Obdach, in the Murtal district of Steiermark, Austria. It serves a population of approximately 3,519 residents, classifying it as a small agglomeration under Austrian and EU regulations. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 4,950 m³/day and an average daily discharge of 790 m³/day, the facility operates well within its capacity. The treated effluent is discharged into local watercourses that drain into the Mur River, a major tributary of the Drava and ultimately the Danube. This contributes to the protection of the Danube basin ecosystem, supporting aquatic life and water quality downstream.

The plant's discharge enters the local drainage network that flows into the Mur River, which is part of the Danube basin. The Mur River supports diverse aquatic habitats and is an important corridor for fish migration. The advanced treatment helps protect the downstream environment from nutrient pollution and organic loading, maintaining ecological balance in the river system.