FIELD: water treatment. SUBSTANCE: apparatus for treating water on biological oxidants comprises biotank with activated sludge settler in the form of vessel enclosing flat loading members and aerator. According to invention, flat loading members are made in the form of flexible curtains capable to change shape and dimensions. Cross pipes on which curtains are strained are additionally interconnected by at least two flexible threads. Aerator pipes are inserted into bottom part of biotank by the aid of lower ends of curtains. Biotank is hydraulically connected with settler through an activated sludge forced supply means. EFFECT: improved design. 4 cl, 3 dwg
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