Damüls Wastewater Treatment Plant, Vorarlberg | Advanced Treatment in Alpine Region

The Damüls wastewater treatment plant is located in the municipality of Damüls in the Bregenz district of Vorarlberg, Austria. It serves a population of 2,030 people, reflecting the small alpine community it supports. The plant is situated in the mountainous region of the Austrian Alps, where tourism drives seasonal population fluctuations. The plant employs advanced treatment processes, exceeding the standard secondary treatment requirements mandated by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 5,000 m³/day and a current discharge volume of 279.45 m³/day, the facility has significant reserve capacity to handle peak loads, likely from winter tourism. The advanced treatment ensures high-quality effluent suitable for discharge into sensitive alpine water bodies. The treated effluent is discharged into local streams that feed into the Bregenzer Ach river, which flows into Lake Constance (Bodensee), a major drinking water reservoir for the region. The plant plays a crucial role in protecting the sensitive alpine aquatic ecosystem and the downstream lake from nutrient pollution, supporting biodiversity and water quality in the Rhine basin.

The plant discharges into local tributaries of the Bregenzer Ach river, which drains into Lake Constance, a large pre-alpine lake shared by Austria, Germany, and Switzerland. Lake Constance is a critical drinking water source and supports diverse aquatic life, including endemic fish species. The advanced treatment at Damüls helps minimize nutrient loading, protecting the lake from eutrophication and maintaining its ecological integrity.