title: [Purification and posttreatment of sewage in biological ponds].
mesh_terms: D008722:Methods; D012722:Sewage; D014865:Waste Disposal, Fluid; D014877:Water Pollution, Chemical / Q000517:prevention & control*
chemical_list: D012722:Sewage
vernacular_title: Ochistka i doochistka stochnykh vod v biologicheskikh prudakh.