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Mainz wastewater treatment plant serves the Wiesbaden area in Hessen, Germany, with a population equivalent of over 300,000. The facility discharges treated effluent into the Rhine River, a major European waterway.
Wiesbaden Biebrich wastewater treatment plant serves approximately 120,000 people in Wiesbaden, Hessen, Germany. It operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.