Waste water treatment plant. This is one of the settling tanks used at various stages in the process. Each tank holds 4000 cubic metres of water. Phot

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Waste water treatment plant. This is one of the settling tanks used at various stages in the process. Each tank holds 4000 cubic metres of water. Photographed in Aarhus, Denmark.

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Size: 3425px × 5138px
Photo credit: © THOMAS FREDBERG/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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