FIELD: process engineering.
SUBSTANCE: invention relates to biological treatment of effluents. waste water is pretreated by activated sludge in receiving aerotank 3.Linear aerator 18 is used to produce protective bubble curtain ahead of slot 16 of intermediate bottom 17 to rule out ingress of major impurities into primary settler 4. Mix of water with activated sludge is fed via slot 16 into activation primary settler 4. Activated sludge is circulated by air lift 19. Activated sludge is subjected to flotation in secondary settler 5 to collect supernatant sludge by means of side bell 24 of U-shape tube 23 of degasser. Cleaned water is discharged from the plant.
EFFECT: simplified design, lower costs and higher reliability.
6 cl, 2 dwg
