[Circulation oxidation canals for the decontamination of sewage waters from minor units].
D012499:Sanitation; D012722:Sewage; D014455:Ukraine; D014876:Water Pollution / Q000517:prevention & control*
D012722:Sewage
Tsirkuliatsionnye okislitel'nye kanaly dlia ochistki stochnykh vod malykh ob'ektov.