FIELD: chemistry.
SUBSTANCE: sewage water is preliminary aerated until degree of saturation with air is not less than 10.2 mg/l. Sorption and oxidation are carried out in biocoenosis of active silt, as such its swollen form is used, mixing sewage water and active silt supplied in countercurrent manner in ascending-descending flow with not less than two-fold cyclic change of pressure onto swollen silt from 0.1 to 0.01 MPa due to forced supply of water-silt mixture from separate sedimentator. Height of purified water layer is not less than 10 m. In sedimentator swollen silt is retained by means of biological film and gravitational sedimentation and purified water is separated in ascending-descending flow.
EFFECT: invention allows to reduce purification cost and improve water purification quality.
1 tbl, 1 ex
