Stock Photo - Dortmund, North Rhine-Westphalia, Germany - Sunny winter landscape in the Ruhr area, ice and snow on the renatured Emscher, digestion towers Kläranlage Dortmund Deusen, the sewage treatment plant is now receiving a 4th purification stage, which also frees the treated wastewater from drug residues, the ecological conversion of the Emscher system consists from the construction of a central wastewater treatment system in the Ruhr area, the construction of underground sewers and the renaturation of the Emscher and its tributaries.
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