FIELD: waste water treatment. SUBSTANCE: waste waters are biologically treated under pressure, after which pressure is reduced and solid particles are almost completely removed involving flotation technics in which reduced-pressure gas is utilized. Pressure may be further reduced in subsequent filtration and/or disinfection operations. Installation comprises elevated-pressure biological treatment means, pressure reduction means, flotation machine or filter. EFFECT: enabled utilization of treated water not only in process operations but also as drinking water. 15 cl, 1 dwg
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