Overview
Riezlern wastewater treatment plant serves the village of Riezlern in Vorarlberg, Austria. It treats wastewater from a population of approximately 7,866 under the EU Urban Waste Water Treatment Directive.
The Riezlern wastewater treatment plant is located in the village of Riezlern, part of the Mittelberg municipality in the Bregenz district of Vorarlberg, Austria. Situated in the Alpine region, the plant serves a population of about 7,866 residents and visitors, reflecting the area's role as a tourist destination. The plant is part of Austria's municipal wastewater infrastructure, which is regulated under the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size (between 2,000 and 10,000 population equivalent), the directive requires secondary treatment as a minimum standard. Austria has implemented this directive through national legislation, ensuring that treatment plants meet appropriate effluent quality standards to protect receiving waters. The plant's discharge ultimately flows into the Breitach River, a tributary of the Iller, which joins the Danube and drains into the Black Sea. The Alpine watershed is ecologically sensitive, supporting diverse aquatic life and providing important water resources for downstream communities. The plant's operation helps maintain water quality in this high-altitude environment, which is vital for both local ecosystems and tourism.
Environmental context
The plant discharges into the Breitach River, which flows into the Iller River, a tributary of the Danube. The Danube ultimately drains into the Black Sea. The Alpine watershed is characterized by fast-flowing, oxygen-rich waters that support sensitive aquatic species such as brown trout and the European bullhead. Maintaining high treatment standards is crucial to prevent nutrient enrichment and protect the ecological integrity of this headwater system, which also serves as a drinking water source for downstream communities.
Frequently asked questions
The Riezlern wastewater treatment plant is located in the village of Riezlern, part of the Mittelberg municipality in the Bregenz district of Vorarlberg, Austria. It serves the local population and tourist facilities in this Alpine region.
The plant serves approximately 7,866 people, including residents and tourists. This size classifies it as a small to medium agglomeration under the EU Urban Waste Water Treatment Directive.
The treated wastewater is discharged into the Breitach River, a tributary of the Iller River, which flows into the Danube and eventually reaches the Black Sea. The plant's discharge point is in a sensitive Alpine watershed.
The plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. Austria has transposed this directive into national law, with enforcement by regional authorities in Vorarlberg.
For agglomerations between 2,000 and 10,000 population equivalent, the EU directive mandates secondary treatment. In Austria, plants of this scale typically employ biological treatment processes such as activated sludge or trickling filters to meet effluent standards.
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