METHOD AND DEVICE FOR REMOVING NITROGEN AT WASTEWATER TREATMENT Russian patent published in 2018 - IPC C02F3/00 C02F3/28 C02F3/30 

FIELD: chemistry.

SUBSTANCE: wastewater treatment plant includes a reactor, a sensor for determining the concentration of oxidized nitrogen in the reactor and for generating a signal for the concentration of oxidized nitrogen reflecting the concentration of nitrite, nitrate, or a combination of nitrite and nitrate, a control device for processing signals for the concentration of oxidized nitrogen and ammonia and to adjust the dissolved oxygen (DO), the duration of the aerobic phase, and/or the duration of the anoxic phase in the reactor to the base and the ratio or sum of the concentration of ammonia and the concentration of oxidized nitrogen, the control device being able to vary the DO concentration profile between the lower set DO value and the upper set DO value, wherein the controlled outgoing stream containing ammonia and nitrite is fed to the anoxic reactor where selectively grown and the anammox bacteria are retained.

EFFECT: removal of nitrogen from wastewater and production of high-quality treated wastewater with reduced energy consumption, consumption of chemical reagents and cost.

20 cl, 16 dwg