Wastewater treatment

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  wastewater treatment plant
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  wastewater channel flows into a river

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  big wastewater treatment plant
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  API Oil-Water Separator
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  Parallel Plate Oil-Water Separator
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  Dissolved Air Flotation Unit (Oil-Water Separation)
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  Surface-Aerated Basin
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  Schematic of the media contact face in a trickling filter
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  Typical complete trickle filter system
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  A small wastewater treatment plant in landscape of Steingaden (Germany), a little brook and agriculture, Solar panels.
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  Constructed wetland for wastewater
  (→ en-Wp article, de-Wp: Pflanzenkläranlage)
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  Constructed wetland with plants.
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  Retentionsbodenfilter und Regenrückhaltebecken (filter for rainwater of streets)

See also: Waste management.