FIELD: water treatment. SUBSTANCE: invention, in particular, relates to impurities hardly decomposed by only biological agents. Water flows through principal circuit provided with polluted water-supply device and through branched partial circuit. In the latter, water passes through reactor wherein it is treated with ozone, which causes preoxidation of injurious impurities. Then, water enters tank with aerobic biological medium, wherein injurious impurities are further destroyed. EFFECT: increased degree of water purification and reduced power consumption. 20 cl, 1 dwg
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