Zeil_Sand a Main Wastewater Treatment Plant, Zeil am Main, Bavaria

Zeil_Sand a Main is a wastewater treatment plant located in Zeil am Main, in the Bavarian district of Haßberge, Germany. The plant serves a population of approximately 12,549 people, classifying it as a medium agglomeration under the EU Urban Waste Water Treatment Directive (91/271/EEC). The facility is situated near the Main River, which plays a key role in the region's hydrology. Under the EU UWWTD, agglomerations of this size are required to provide secondary treatment (biological treatment) as a minimum standard. The plant operates within Germany's strict national water regulations, which often mandate advanced treatment in sensitive areas. The Main River basin is designated as a sensitive area under the directive, requiring nutrient removal to protect water quality. The treated effluent from the plant is discharged into the Main River, a major tributary of the Rhine. The Rhine ultimately flows into the North Sea, making this plant part of a large international watershed. The Main River supports diverse aquatic life and is an important corridor for migratory fish species. The plant's operation helps maintain the ecological health of the river system.

The plant discharges into the Main River, which flows into the Rhine and then the North Sea. The Main River basin is a sensitive area under the EU Urban Waste Water Treatment Directive, requiring nutrient removal to prevent eutrophication downstream. The river supports diverse aquatic life and serves as a migratory corridor for fish species such as salmon and eel.