FIELD: process engineering.
SUBSTANCE: invention relates to compact individual biological systems of effluents treatment by active sludge in suspended state and may be used in separate building or minor settlements. Effluents are fed into aerobic zone of aerotank 3 to be treated therein. Biological treatment is carried out in anoxic zone of activation reactor 3. Said anoxic zone arranged above aerobic zone of activation reactor 4 is used to perform denitrification of formed nitrates and nitrites to molecular nitrogen, self-oxidation of active sludge or decomposition of hard-to-oxidise compounds by high-concentration aerobic sludge. Active sludge sediment is mixed up by bottom aeration in large-bubble aerator 19. Active sludge is separated from purified water in settler 7. Large loop of effluents circulation is created communicating settler 7, activation tank 4, aerotank 3 by suction in circulation tube 25. Purified water is discharged via outlet branch pipe 30.
EFFECT: power savings, simplified design, higher reliability and quality.
6 cl, 3 dwg
