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LIEGE SCLESSIN is a municipal wastewater treatment plant serving about 93,150 people in Liège, Belgium. It operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.
WEGNEZ wastewater treatment plant serves Pepinster, Belgium, with a population equivalent of 113,784. It operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.