Essen, North Rhine-Westphalia, Germany - The Emscher River has been completely free of wastewater since January 2022 following the construction of a parallel sewer. The river was previously an open, above-ground wastewater canal, combined sewer with surface water and wastewater, here floating filter cleaning plant.

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Photo credit: © Rupert Oberhäuser / Alamy / Afripics
License: Licensed
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