METHOD OF OXIDISING AMMONIA AND HARD TO GET ORGANIC WASTE WATER SUBSTANCE IN AEROBIC-ANOXIC CONDITIONS (VERSIONS) Russian patent published in 2013 - IPC C02F3/34 C02F3/30 

FIELD: chemistry.

SUBSTANCE: invention relates to biotechnology. Disclosed are methods of oxidising ammonia and hard to get organic waste water substance in aerobic-anoxic conditions. A two- or single-reactor process scheme is used. In case of a two-reactor scheme, at the first step, waste water is discharged into a partial nitrification reactor at temperature of 25-30°C, dissolved oxygen concentration of 0.05-0.4 mg/l, pH 7.5-8.1, sludge dose of 2.5-4 g/l, sludge age of 5-35 days, where partial oxidation of ammonium to nitrite takes place. Therefore, the ratio of concentration of nitrite oxygen to concentration of ammonium nitrogen in the treated water ranges from 1.1 to 1.6. At the second step, the treated water enters a second reactor for simultaneous autotrophic and heterotrophic denitrification at temperature of 20-28°C, pH 7.5-8.5, sludge dose of 1.5-2.5 g/l. Attached biomass of active sludge is additionally used. Active sludge is formed from sludge of the receiving river of the treated water or sludge from treatment facilities during operation of the denitrification reactor in the presence of treated water. In a single-reactor scheme, nitrification and denitrification processes are carried out in a single reactor with active sludge biomass attached to carrier material, at temperature of 20-28°C, dissolved oxygen concentration of 0.16-0.25 mg/l, pH 7.5-8.5, hydraulic dwell time of 2.5-7 days, nitrogen load of 0.1-0.5 kg·M/(m³·day). The active sludge used is formed from sludge from Moscow river or sludge from treatment facilities during operation of the simultaneous nitrification and denitrification reactor in the presence of treated water.

EFFECT: methods enable to remove nitrogen from waste water with high concentration of ammonia and impoverished with easy to get organic substance.

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