FIELD: treatment of household and close in content sewage water of small settlements. SUBSTANCE: sewage water deep treatment works has receiving reservoir, sand trap, balancing reservoir with submersible pump and controlled spillway, aerobic stabilizer of sediments with tubular settler and aerotank-settler of the first stage with wire brush packing in aeration zone and thin-layer modules in settling zone. The secondary aerotank-settler is made in form of body accommodating inclined partitions short of bottom and having longitudinal holes and lips. Works has denitrificator and biological reactor in form of body accommodating layers of large-pore wire brush filler and grainy medium with unit in form of mixer for water supply, and degassing chamber, charcoal filter with ozonizing filter, contact reservoir and silt platforms. EFFECT: higher degree of purification of sewage water from organic compounds, suspended matter, compounds of nitrogen and phosphorus, oil products and surfactants and improved stability of treatment process and hydraulic conditions in operation of treatment works. 1 dwg, 1 tbl
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