title: [Pollution and preservation of nature. Problem of water purification].
mesh_terms: D001431:Bacteriological Techniques; D004463:Ecology; D008722:Methods; D010101:Oxygen Consumption; D014867:Water / Q000032:analysis; D014871:Water Microbiology; D014876:Water Pollution
chemical_list: D014867:Water
vernacular_title: Pollution et préservation de la nature. Le problème de l'épuration des eaux.