METHOD OF BIOLOGICAL PURIFICATION OF LIQUID FRACTIONS CONTAINING A DISINFECTANT QUATERNARY AMMONIUM SALTS (QAC) AND SIMILAR SUBSTANCES TOGETHER WITH HOUSEHOLD AND/OR INDUSTRIAL WASTEWATER CLOSE TO THEM IN COMPOSITION Russian patent published in 2021 - IPC C02F3/30 C02F9/14 

FIELD: biological purification.

SUBSTANCE: invention relates to the field of biological purification of liquid waste containing a disinfectant quaternary ammonium salts (QAS), and can be used for the joint purification of liquid waste and wastewater of industrial enterprises, settlements, separate buildings, cottages, airports, railway transport. Liquid waste containing the disinfectant quaternary ammonium salts is sent for mechanical cleaning, and then to a sorption mixer or pre-purification tank, where it is mixed in a ratio of 1:n, where n≥2, by volume with compacted sludge, previously regenerated for 15-48 hours, depending on the age of the sludge. In the sludge compactor, due to the aeration of the sludge liquid in the aerobic stabilizer, the oxygen concentration of 1-4 mg/l is maintained. From the sorption mixer or pre-purification tank, the sludge liquid is sent to the solid-liquid phase separation stage. The liquid phase – the fugate – is sent to a bio-filter with a ruff loading, then, the filtrate is sent to the mixing chamber of a sewage pumping station for combining with household and/or industrial wastewater. Next, the mixture is sent to the anoxic zone of the aeration tank to implement the denitrification process. The recycled sludge mixture is also sent to this stage from the aeration zone of the aeration tank, in which the nitrification process is implemented, and the circulating active sludge is sent from the secondary settling tank. The dose of sludge at the stages of anoxic and aerobic wastewater treatment in the aeration tank is 2.5-5 g/l for dry substance. The sludge mixture from the aerobic zone of the aeration tank is directed to the secondary settling tank, supernatant liquor from the secondary settling tank is directed to the construction of post-purification, circulating sludge is directed to anoxic stage of aeration tank, the excess active sludge is sent to the regenerator.

EFFECT: invention makes it possible to reduce the volume of the anoxic and aerobic zones of the aeration tank, as well as to increase reliability of the purification facilities and the environmental friendliness of the purification process.

7 cl, 1 dwg, 1 tbl, 1 ex