FIELD: chemistry, water purification.
SUBSTANCE: invention refers to biological sewage treatment with activated sludge, and is applied as local treatment facilities in cottages, detached buildings or groups of buildings, drive-up public catering establishments. Invention concerns biological sewage treatment system containing integrated units: aeration tank and sludge regenerator. In aeration tank, sludge regenerator represents vertical spiral pipe with its upper neck higher than working water level and its lower neck not touching upon the case bottom. The way sludge regenerator is mounted in aeration tank allows for no demand to use separate tank with airlifts and cross-flows for sludge regeneration, for sludge-regeneration or stabilisation counterflowing with free and continuous contaminated water drainage.
EFFECT: higher efficiency of the system due to stretching of sewage path, and due to realised displacement conditions.
2 dwg
