METHOD OF TREATING WASTE WATER Russian patent published in 2018 - IPC C02F3/02 C02F3/12 C02F9/14 

FIELD: technology of water and air purification.

SUBSTANCE: invention relates to waste water treatment methods. Method for waste water treatment is described, in which the primary desilting of waste water is carried out for precipitation and removal of solids in a denitrification zone, pre-denitrification for nitrates conversion to nitrites and further to gaseous oxides and molecular nitrogen in the denitrification zone, with periodic mixing of the deposited precipitate, after which the post-treatment of waste water in a bioreactor is carried out, after which the effluents are discharged as treated waters, method differs in that further averaging and dilution of waste water recirculated within the treatment plant with water in the averaging and dilution zone with periodic mixing of the deposited precipitate, after that, the clarified waste water is purified by active silt with periodic switching off of the aeration, during the process, periodic saturation of waste water with oxygen or air in the pre-aeration zone is carried out by conducting a reagent treatment of waste water with a coagulant for reagent dephosphatization and improvement of flocculation of the active silt, after which the secondary desilting of waste water is carried out for the precipitation and removal of solids and the activated silt removed from the pre-aeration zone, after which the first part of the treated waters is fed to averaging and diluting waste water into the averaging and dilution zone, and the second part of the waste water to be treated is fed to the waste water treatment stage, immobilized biocenosis, for which the saturation of waste water with oxygen or air is carried out in the zone of the contract bioreactor with immobilized biocenosis (biofilms), after which tertiary desilting is carried out for precipitation and removal of solids and depleted biomass in the tertiary desilting zone, after which the part is discharged as purified water, and part of the wastewater to be treated is fed to the stabilizer-regenerator zone for regeneration and enhancement of mineralization and deeper nitrification, for which saturation of waste water with oxygen or air is carried out without addition of external power, after which the treated waste water is fed to the pre-denitrification stage into the denitrification zone to create in this zone anoxic conditions necessary for the denitrification process.

EFFECT: improved method for waste water treatment is offered.

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