FIELD: chemistry, technological processes.
SUBSTANCE: method includes sorption and oxidation of sewage water in biocoenosis of active silt, in combination with process of sorption and oxidation by means of biological film with degree of oxygen air saturation not less than 18-22 mg/l. Process is carried out after cavitational processing with cavitation number G=0.004 at the stage of preliminary purification successively in three stages, which take place in autonomous reactors, which differ from each other by used biocoenosis of active silt and biological film. Mixing of active silt with purified sewage water is carried out in each reactor not less than twice in ascending-descending flow, formed in reactor by turbulization of supplied to lower part of reactor water-air mixture, processed at each stage by cavitation with number G=0.002 and aeration. Retained sediment is divided into parts, each of which is supplied to one of reactors, where water purification took place, one - for silt regeneration, the remaining - for processing of utilized sediment, where it is processed in alternating manner in turns by cavitation with numbers G=0.001 and 6.5, number of cycles being not less than two. Supply of sewage water into each of reactors, used for regeneration of swollen silt or sediment processing, is stopped for the time required for said processes, during which in circulation process repeated aerational and cavitational processing are carried out, after which silt is compacted by settling process, and supernatant water, which was enriched with ferments in process of sediment processing, is supplied to initial stage of water purification process.
EFFECT: method allows to increase degree of water purification reducing purification cost and increasing safety degree of utilised silt sediment as organic-mineral product.
2 tbl, 1 ex
